Fix broken and missing DataView interface items for Phoenix
[wxWidgets.git] / src / msw / treectrl.cpp
index 549b53236f1cfcdb1cffd4b1f68696b6162b3703..0ac6f626c0ccec0da55434dc010c097c2f6d5ea8 100644 (file)
 /////////////////////////////////////////////////////////////////////////////
-// Name:        treectrl.cpp
+// Name:        src/msw/treectrl.cpp
 // Purpose:     wxTreeCtrl
 // Author:      Julian Smart
-// Modified by:
+// Modified by: Vadim Zeitlin to be less MSW-specific on 10.10.98
 // Created:     1997
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart
-// Licence:    wxWindows licence
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
-#pragma implementation "treectrl.h"
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#if wxUSE_TREECTRL
+
+#include "wx/treectrl.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/msw/wrapcctl.h" // include <commctrl.h> "properly"
+    #include "wx/msw/missing.h"
+    #include "wx/dynarray.h"
+    #include "wx/log.h"
+    #include "wx/app.h"
+    #include "wx/settings.h"
+#endif
+
+#include "wx/dynlib.h"
+#include "wx/msw/private.h"
+
+#include "wx/imaglist.h"
+#include "wx/msw/dragimag.h"
+#include "wx/msw/uxtheme.h"
+
+// macros to hide the cast ugliness
+// --------------------------------
+
+// get HTREEITEM from wxTreeItemId
+#define HITEM(item)     ((HTREEITEM)(((item).m_pItem)))
+
+
+// older SDKs are missing these
+#ifndef TVN_ITEMCHANGINGA
+
+#define TVN_ITEMCHANGINGA (TVN_FIRST-16)
+#define TVN_ITEMCHANGINGW (TVN_FIRST-17)
+
+typedef struct tagNMTVITEMCHANGE
+{
+    NMHDR hdr;
+    UINT uChanged;
+    HTREEITEM hItem;
+    UINT uStateNew;
+    UINT uStateOld;
+    LPARAM lParam;
+} NMTVITEMCHANGE;
+
 #endif
 
-// For compilers that support precompilation, includes "wx.h".
-#include "wx/wxprec.h"
 
-#ifdef __BORLANDC__
-#pragma hdrstop
-#endif
+// this helper class is used on vista systems for preventing unwanted
+// item state changes in the vista tree control.  It is only effective in
+// multi-select mode on vista systems.
+
+// The vista tree control includes some new code that originally broke the
+// multi-selection tree, causing seemingly spurious item selection state changes
+// during Shift or Ctrl-click item selection. (To witness the original broken
+// behaviour, simply make IsLocked() below always return false). This problem was
+// solved by using the following class to 'unlock' an item's selection state.
+
+class TreeItemUnlocker
+{
+public:
+    // unlock a single item
+    TreeItemUnlocker(HTREEITEM item)
+    {
+        m_oldUnlockedItem = ms_unlockedItem;
+        ms_unlockedItem = item;
+    }
+
+    // unlock all items, don't use unless absolutely necessary
+    TreeItemUnlocker()
+    {
+        m_oldUnlockedItem = ms_unlockedItem;
+        ms_unlockedItem = (HTREEITEM)-1;
+    }
+
+    // lock everything back
+    ~TreeItemUnlocker() { ms_unlockedItem = m_oldUnlockedItem; }
+
+
+    // check if the item state is currently locked
+    static bool IsLocked(HTREEITEM item)
+        { return ms_unlockedItem != (HTREEITEM)-1 && item != ms_unlockedItem; }
+
+private:
+    static HTREEITEM ms_unlockedItem;
+    HTREEITEM m_oldUnlockedItem;
+
+    wxDECLARE_NO_COPY_CLASS(TreeItemUnlocker);
+};
+
+HTREEITEM TreeItemUnlocker::ms_unlockedItem = NULL;
+
+// another helper class: set the variable to true during its lifetime and reset
+// it to false when it is destroyed
+//
+// it is currently always used with wxTreeCtrl::m_changingSelection
+class TempSetter
+{
+public:
+    TempSetter(bool& var) : m_var(var)
+    {
+        wxASSERT_MSG( !m_var, "variable shouldn't be already set" );
+        m_var = true;
+    }
+
+    ~TempSetter()
+    {
+        m_var = false;
+    }
+
+private:
+    bool& m_var;
+
+    wxDECLARE_NO_COPY_CLASS(TempSetter);
+};
+
+// ----------------------------------------------------------------------------
+// private functions
+// ----------------------------------------------------------------------------
+
+namespace
+{
+
+// Work around a problem with TreeView_GetItemRect() when using MinGW/Cygwin:
+// it results in warnings about breaking strict aliasing rules because HITEM is
+// passed via a RECT pointer, so use a union to avoid them and define our own
+// version of the standard macro using it.
+union TVGetItemRectParam
+{
+    RECT rect;
+    HTREEITEM hItem;
+};
+
+inline bool
+wxTreeView_GetItemRect(HWND hwnd,
+                       HTREEITEM hItem,
+                       TVGetItemRectParam& param,
+                       BOOL fItemRect)
+{
+    param.hItem = hItem;
+    return ::SendMessage(hwnd, TVM_GETITEMRECT, fItemRect,
+                        (LPARAM)&param) == TRUE;
+}
+
+} // anonymous namespace
+
+// wrappers for TreeView_GetItem/TreeView_SetItem
+static bool IsItemSelected(HWND hwndTV, HTREEITEM hItem)
+{
+    TV_ITEM tvi;
+    tvi.mask = TVIF_STATE | TVIF_HANDLE;
+    tvi.stateMask = TVIS_SELECTED;
+    tvi.hItem = hItem;
+
+    TreeItemUnlocker unlocker(hItem);
+
+    if ( !TreeView_GetItem(hwndTV, &tvi) )
+    {
+        wxLogLastError(wxT("TreeView_GetItem"));
+    }
+
+    return (tvi.state & TVIS_SELECTED) != 0;
+}
+
+static bool SelectItem(HWND hwndTV, HTREEITEM hItem, bool select = true)
+{
+    TV_ITEM tvi;
+    tvi.mask = TVIF_STATE | TVIF_HANDLE;
+    tvi.stateMask = TVIS_SELECTED;
+    tvi.state = select ? TVIS_SELECTED : 0;
+    tvi.hItem = hItem;
+
+    TreeItemUnlocker unlocker(hItem);
+
+    if ( TreeView_SetItem(hwndTV, &tvi) == -1 )
+    {
+        wxLogLastError(wxT("TreeView_SetItem"));
+        return false;
+    }
+
+    return true;
+}
+
+static inline void UnselectItem(HWND hwndTV, HTREEITEM htItem)
+{
+    SelectItem(hwndTV, htItem, false);
+}
+
+static inline void ToggleItemSelection(HWND hwndTV, HTREEITEM htItem)
+{
+    SelectItem(hwndTV, htItem, !IsItemSelected(hwndTV, htItem));
+}
+
+// helper function which selects all items in a range and, optionally,
+// deselects all the other ones
+//
+// returns true if the selection changed at all or false if nothing changed
+
+// flags for SelectRange()
+enum
+{
+    SR_SIMULATE = 1,        // don't do anything, just return true or false
+    SR_UNSELECT_OTHERS = 2  // deselect the items not in range
+};
+
+static bool SelectRange(HWND hwndTV,
+                        HTREEITEM htFirst,
+                        HTREEITEM htLast,
+                        int flags)
+{
+    // find the first (or last) item and select it
+    bool changed = false;
+    bool cont = true;
+    HTREEITEM htItem = (HTREEITEM)TreeView_GetRoot(hwndTV);
+
+    while ( htItem && cont )
+    {
+        if ( (htItem == htFirst) || (htItem == htLast) )
+        {
+            if ( !IsItemSelected(hwndTV, htItem) )
+            {
+                if ( !(flags & SR_SIMULATE) )
+                {
+                    SelectItem(hwndTV, htItem);
+                }
+
+                changed = true;
+            }
+
+            cont = false;
+        }
+        else // not first or last
+        {
+            if ( flags & SR_UNSELECT_OTHERS )
+            {
+                if ( IsItemSelected(hwndTV, htItem) )
+                {
+                    if ( !(flags & SR_SIMULATE) )
+                        UnselectItem(hwndTV, htItem);
+
+                    changed = true;
+                }
+            }
+        }
+
+        htItem = (HTREEITEM)TreeView_GetNextVisible(hwndTV, htItem);
+    }
+
+    // select the items in range
+    cont = htFirst != htLast;
+    while ( htItem && cont )
+    {
+        if ( !IsItemSelected(hwndTV, htItem) )
+        {
+            if ( !(flags & SR_SIMULATE) )
+            {
+                SelectItem(hwndTV, htItem);
+            }
+
+            changed = true;
+        }
+
+        cont = (htItem != htFirst) && (htItem != htLast);
+
+        htItem = (HTREEITEM)TreeView_GetNextVisible(hwndTV, htItem);
+    }
+
+    // optionally deselect the rest
+    if ( flags & SR_UNSELECT_OTHERS )
+    {
+        while ( htItem )
+        {
+            if ( IsItemSelected(hwndTV, htItem) )
+            {
+                if ( !(flags & SR_SIMULATE) )
+                {
+                    UnselectItem(hwndTV, htItem);
+                }
+
+                changed = true;
+            }
+
+            htItem = (HTREEITEM)TreeView_GetNextVisible(hwndTV, htItem);
+        }
+    }
+
+    // seems to be necessary - otherwise the just selected items don't always
+    // appear as selected
+    if ( !(flags & SR_SIMULATE) )
+    {
+        UpdateWindow(hwndTV);
+    }
+
+    return changed;
+}
+
+// helper function which tricks the standard control into changing the focused
+// item without changing anything else (if someone knows why Microsoft doesn't
+// allow to do it by just setting TVIS_FOCUSED flag, please tell me!)
+//
+// returns true if the focus was changed, false if the given item was already
+// the focused one
+static bool SetFocus(HWND hwndTV, HTREEITEM htItem)
+{
+    // the current focus
+    HTREEITEM htFocus = (HTREEITEM)TreeView_GetSelection(hwndTV);
+
+    if ( htItem == htFocus )
+        return false;
+
+    if ( htItem )
+    {
+        // remember the selection state of the item
+        bool wasSelected = IsItemSelected(hwndTV, htItem);
+
+        if ( htFocus && IsItemSelected(hwndTV, htFocus) )
+        {
+            // prevent the tree from unselecting the old focus which it
+            // would do by default (TreeView_SelectItem unselects the
+            // focused item)
+            TreeView_SelectItem(hwndTV, 0);
+            SelectItem(hwndTV, htFocus);
+        }
+
+        TreeView_SelectItem(hwndTV, htItem);
+
+        if ( !wasSelected )
+        {
+            // need to clear the selection which TreeView_SelectItem() gave
+            // us
+            UnselectItem(hwndTV, htItem);
+        }
+        //else: was selected, still selected - ok
+    }
+    else // reset focus
+    {
+        bool wasFocusSelected = IsItemSelected(hwndTV, htFocus);
+
+        // just clear the focus
+        TreeView_SelectItem(hwndTV, 0);
+
+        if ( wasFocusSelected )
+        {
+            // restore the selection state
+            SelectItem(hwndTV, htFocus);
+        }
+    }
+
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// private classes
+// ----------------------------------------------------------------------------
+
+// a convenient wrapper around TV_ITEM struct which adds a ctor
+#ifdef __VISUALC__
+#pragma warning( disable : 4097 ) // inheriting from typedef
+#endif
+
+struct wxTreeViewItem : public TV_ITEM
+{
+    wxTreeViewItem(const wxTreeItemId& item,    // the item handle
+                   UINT mask_,                  // fields which are valid
+                   UINT stateMask_ = 0)         // for TVIF_STATE only
+    {
+        wxZeroMemory(*this);
+
+        // hItem member is always valid
+        mask = mask_ | TVIF_HANDLE;
+        stateMask = stateMask_;
+        hItem = HITEM(item);
+    }
+};
+
+// ----------------------------------------------------------------------------
+// This class is our userdata/lParam for the TV_ITEMs stored in the treeview.
+//
+// We need this for a couple of reasons:
+//
+// 1) This class is needed for support of different images: the Win32 common
+// control natively supports only 2 images (the normal one and another for the
+// selected state). We wish to provide support for 2 more of them for folder
+// items (i.e. those which have children): for expanded state and for expanded
+// selected state. For this we use this structure to store the additional items
+// images.
+//
+// 2) This class is also needed to hold the HITEM so that we can sort
+// it correctly in the MSW sort callback.
+//
+// In addition it makes other workarounds such as this easier and helps
+// simplify the code.
+// ----------------------------------------------------------------------------
+
+class wxTreeItemParam
+{
+public:
+    wxTreeItemParam()
+    {
+        m_data = NULL;
+
+        for ( size_t n = 0; n < WXSIZEOF(m_images); n++ )
+        {
+            m_images[n] = -1;
+        }
+    }
+
+    // dtor deletes the associated data as well
+    virtual ~wxTreeItemParam() { delete m_data; }
+
+    // accessors
+        // get the real data associated with the item
+    wxTreeItemData *GetData() const { return m_data; }
+        // change it
+    void SetData(wxTreeItemData *data) { m_data = data; }
+
+        // do we have such image?
+    bool HasImage(wxTreeItemIcon which) const { return m_images[which] != -1; }
+        // get image, falling back to the other images if this one is not
+        // specified
+    int GetImage(wxTreeItemIcon which) const
+    {
+        int image = m_images[which];
+        if ( image == -1 )
+        {
+            switch ( which )
+            {
+                case wxTreeItemIcon_SelectedExpanded:
+                    // We consider that expanded icon is more important than
+                    // selected so test for it first.
+                    image = m_images[wxTreeItemIcon_Expanded];
+                    if ( image == -1 )
+                        image = m_images[wxTreeItemIcon_Selected];
+                    if ( image != -1 )
+                        break;
+                    //else: fall through
+
+                case wxTreeItemIcon_Selected:
+                case wxTreeItemIcon_Expanded:
+                    image = m_images[wxTreeItemIcon_Normal];
+                    break;
+
+                case wxTreeItemIcon_Normal:
+                    // no fallback
+                    break;
+
+                default:
+                    wxFAIL_MSG( wxT("unsupported wxTreeItemIcon value") );
+            }
+        }
+
+        return image;
+    }
+        // change the given image
+    void SetImage(int image, wxTreeItemIcon which) { m_images[which] = image; }
+
+        // get item
+    const wxTreeItemId& GetItem() const { return m_item; }
+        // set item
+    void SetItem(const wxTreeItemId& item) { m_item = item; }
+
+protected:
+    // all the images associated with the item
+    int m_images[wxTreeItemIcon_Max];
+
+    // item for sort callbacks
+    wxTreeItemId m_item;
+
+    // the real client data
+    wxTreeItemData *m_data;
+
+    wxDECLARE_NO_COPY_CLASS(wxTreeItemParam);
+};
+
+// wxVirutalNode is used in place of a single root when 'hidden' root is
+// specified.
+class wxVirtualNode : public wxTreeViewItem
+{
+public:
+    wxVirtualNode(wxTreeItemParam *param)
+        : wxTreeViewItem(TVI_ROOT, 0)
+    {
+        m_param = param;
+    }
+
+    ~wxVirtualNode()
+    {
+        delete m_param;
+    }
+
+    wxTreeItemParam *GetParam() const { return m_param; }
+    void SetParam(wxTreeItemParam *param) { delete m_param; m_param = param; }
+
+private:
+    wxTreeItemParam *m_param;
+
+    wxDECLARE_NO_COPY_CLASS(wxVirtualNode);
+};
+
+#ifdef __VISUALC__
+#pragma warning( default : 4097 )
+#endif
+
+// a macro to get the virtual root, returns NULL if none
+#define GET_VIRTUAL_ROOT() ((wxVirtualNode *)m_pVirtualRoot)
+
+// returns true if the item is the virtual root
+#define IS_VIRTUAL_ROOT(item) (HITEM(item) == TVI_ROOT)
+
+// a class which encapsulates the tree traversal logic: it vists all (unless
+// OnVisit() returns false) items under the given one
+class wxTreeTraversal
+{
+public:
+    wxTreeTraversal(const wxTreeCtrl *tree)
+    {
+        m_tree = tree;
+    }
+
+    // give it a virtual dtor: not really needed as the class is never used
+    // polymorphically and not even allocated on heap at all, but this is safer
+    // (in case it ever is) and silences the compiler warnings for now
+    virtual ~wxTreeTraversal() { }
+
+    // do traverse the tree: visit all items (recursively by default) under the
+    // given one; return true if all items were traversed or false if the
+    // traversal was aborted because OnVisit returned false
+    bool DoTraverse(const wxTreeItemId& root, bool recursively = true);
+
+    // override this function to do whatever is needed for each item, return
+    // false to stop traversing
+    virtual bool OnVisit(const wxTreeItemId& item) = 0;
+
+protected:
+    const wxTreeCtrl *GetTree() const { return m_tree; }
+
+private:
+    bool Traverse(const wxTreeItemId& root, bool recursively);
+
+    const wxTreeCtrl *m_tree;
+
+    wxDECLARE_NO_COPY_CLASS(wxTreeTraversal);
+};
+
+// internal class for getting the selected items
+class TraverseSelections : public wxTreeTraversal
+{
+public:
+    TraverseSelections(const wxTreeCtrl *tree,
+                       wxArrayTreeItemIds& selections)
+        : wxTreeTraversal(tree), m_selections(selections)
+        {
+            m_selections.Empty();
+
+            if (tree->GetCount() > 0)
+                DoTraverse(tree->GetRootItem());
+        }
+
+    virtual bool OnVisit(const wxTreeItemId& item)
+    {
+        const wxTreeCtrl * const tree = GetTree();
+
+        // can't visit a virtual node.
+        if ( (tree->GetRootItem() == item) && tree->HasFlag(wxTR_HIDE_ROOT) )
+        {
+            return true;
+        }
+
+        if ( ::IsItemSelected(GetHwndOf(tree), HITEM(item)) )
+        {
+            m_selections.Add(item);
+        }
+
+        return true;
+    }
+
+    size_t GetCount() const { return m_selections.GetCount(); }
+
+private:
+    wxArrayTreeItemIds& m_selections;
+
+    wxDECLARE_NO_COPY_CLASS(TraverseSelections);
+};
+
+// internal class for counting tree items
+class TraverseCounter : public wxTreeTraversal
+{
+public:
+    TraverseCounter(const wxTreeCtrl *tree,
+                    const wxTreeItemId& root,
+                    bool recursively)
+        : wxTreeTraversal(tree)
+        {
+            m_count = 0;
+
+            DoTraverse(root, recursively);
+        }
+
+    virtual bool OnVisit(const wxTreeItemId& WXUNUSED(item))
+    {
+        m_count++;
+
+        return true;
+    }
+
+    size_t GetCount() const { return m_count; }
+
+private:
+    size_t m_count;
+
+    wxDECLARE_NO_COPY_CLASS(TraverseCounter);
+};
+
+// ----------------------------------------------------------------------------
+// wxWin macros
+// ----------------------------------------------------------------------------
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// indices in gs_expandEvents table below
+enum
+{
+    IDX_COLLAPSE,
+    IDX_EXPAND,
+    IDX_WHAT_MAX
+};
+
+enum
+{
+    IDX_DONE,
+    IDX_DOING,
+    IDX_HOW_MAX
+};
+
+// handy table for sending events - it has to be initialized during run-time
+// now so can't be const any more
+static /* const */ wxEventType gs_expandEvents[IDX_WHAT_MAX][IDX_HOW_MAX];
+
+/*
+   but logically it's a const table with the following entries:
+=
+{
+    { wxEVT_COMMAND_TREE_ITEM_COLLAPSED, wxEVT_COMMAND_TREE_ITEM_COLLAPSING },
+    { wxEVT_COMMAND_TREE_ITEM_EXPANDED,  wxEVT_COMMAND_TREE_ITEM_EXPANDING  }
+};
+*/
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// tree traversal
+// ----------------------------------------------------------------------------
+
+bool wxTreeTraversal::DoTraverse(const wxTreeItemId& root, bool recursively)
+{
+    if ( !OnVisit(root) )
+        return false;
+
+    return Traverse(root, recursively);
+}
+
+bool wxTreeTraversal::Traverse(const wxTreeItemId& root, bool recursively)
+{
+    wxTreeItemIdValue cookie;
+    wxTreeItemId child = m_tree->GetFirstChild(root, cookie);
+    while ( child.IsOk() )
+    {
+        // depth first traversal
+        if ( recursively && !Traverse(child, true) )
+            return false;
+
+        if ( !OnVisit(child) )
+            return false;
+
+        child = m_tree->GetNextChild(root, cookie);
+    }
+
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// construction and destruction
+// ----------------------------------------------------------------------------
+
+void wxTreeCtrl::Init()
+{
+    m_textCtrl = NULL;
+    m_hasAnyAttr = false;
+#if wxUSE_DRAGIMAGE
+    m_dragImage = NULL;
+#endif
+    m_pVirtualRoot = NULL;
+    m_dragStarted = false;
+    m_focusLost = true;
+    m_changingSelection = false;
+    m_triggerStateImageClick = false;
+    m_mouseUpDeselect = false;
+
+    // initialize the global array of events now as it can't be done statically
+    // with the wxEVT_XXX values being allocated during run-time only
+    gs_expandEvents[IDX_COLLAPSE][IDX_DONE] = wxEVT_COMMAND_TREE_ITEM_COLLAPSED;
+    gs_expandEvents[IDX_COLLAPSE][IDX_DOING] = wxEVT_COMMAND_TREE_ITEM_COLLAPSING;
+    gs_expandEvents[IDX_EXPAND][IDX_DONE] = wxEVT_COMMAND_TREE_ITEM_EXPANDED;
+    gs_expandEvents[IDX_EXPAND][IDX_DOING] = wxEVT_COMMAND_TREE_ITEM_EXPANDING;
+}
+
+bool wxTreeCtrl::Create(wxWindow *parent,
+                        wxWindowID id,
+                        const wxPoint& pos,
+                        const wxSize& size,
+                        long style,
+                        const wxValidator& validator,
+                        const wxString& name)
+{
+    Init();
+
+    if ( (style & wxBORDER_MASK) == wxBORDER_DEFAULT )
+        style |= wxBORDER_SUNKEN;
+
+    if ( !CreateControl(parent, id, pos, size, style, validator, name) )
+        return false;
+
+    WXDWORD exStyle = 0;
+    DWORD wstyle = MSWGetStyle(m_windowStyle, & exStyle);
+    wstyle |= WS_TABSTOP | TVS_SHOWSELALWAYS;
+
+    if ( !(m_windowStyle & wxTR_NO_LINES) )
+        wstyle |= TVS_HASLINES;
+    if ( m_windowStyle & wxTR_HAS_BUTTONS )
+        wstyle |= TVS_HASBUTTONS;
+
+    if ( m_windowStyle & wxTR_EDIT_LABELS )
+        wstyle |= TVS_EDITLABELS;
+
+    if ( m_windowStyle & wxTR_LINES_AT_ROOT )
+        wstyle |= TVS_LINESATROOT;
+
+    if ( m_windowStyle & wxTR_FULL_ROW_HIGHLIGHT )
+    {
+        if ( wxApp::GetComCtl32Version() >= 471 )
+            wstyle |= TVS_FULLROWSELECT;
+    }
+
+#if !defined(__WXWINCE__) && defined(TVS_INFOTIP)
+    // Need so that TVN_GETINFOTIP messages will be sent
+    wstyle |= TVS_INFOTIP;
+#endif
+
+    // Create the tree control.
+    if ( !MSWCreateControl(WC_TREEVIEW, wstyle, pos, size) )
+        return false;
+
+    SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
+    SetForegroundColour(wxWindow::GetParent()->GetForegroundColour());
+
+    wxSetCCUnicodeFormat(GetHwnd());
+
+    if ( m_windowStyle & wxTR_TWIST_BUTTONS )
+    {
+        // Under Vista and later Explorer uses rotating ("twist") buttons
+        // instead of the default "+/-" ones so apply its theme to the tree
+        // control to implement this style.
+        if ( wxGetWinVersion() >= wxWinVersion_Vista )
+        {
+            if ( wxUxThemeEngine *theme = wxUxThemeEngine::GetIfActive() )
+            {
+                theme->SetWindowTheme(GetHwnd(), L"EXPLORER", NULL);
+            }
+        }
+    }
+
+    return true;
+}
+
+wxTreeCtrl::~wxTreeCtrl()
+{
+    m_isBeingDeleted = true;
+
+    // delete any attributes
+    if ( m_hasAnyAttr )
+    {
+        WX_CLEAR_HASH_MAP(wxMapTreeAttr, m_attrs);
+
+        // prevent TVN_DELETEITEM handler from deleting the attributes again!
+        m_hasAnyAttr = false;
+    }
+
+    DeleteTextCtrl();
+
+    // delete user data to prevent memory leaks
+    // also deletes hidden root node storage.
+    DeleteAllItems();
+}
+
+// ----------------------------------------------------------------------------
+// accessors
+// ----------------------------------------------------------------------------
+
+/* static */ wxVisualAttributes
+wxTreeCtrl::GetClassDefaultAttributes(wxWindowVariant variant)
+{
+    wxVisualAttributes attrs = GetCompositeControlsDefaultAttributes(variant);
+
+    // common controls have their own default font
+    attrs.font = wxGetCCDefaultFont();
+
+    return attrs;
+}
+
+
+// simple wrappers which add error checking in debug mode
+
+bool wxTreeCtrl::DoGetItem(wxTreeViewItem *tvItem) const
+{
+    wxCHECK_MSG( tvItem->hItem != TVI_ROOT, false,
+                 wxT("can't retrieve virtual root item") );
+
+    if ( !TreeView_GetItem(GetHwnd(), tvItem) )
+    {
+        wxLogLastError(wxT("TreeView_GetItem"));
+
+        return false;
+    }
+
+    return true;
+}
+
+void wxTreeCtrl::DoSetItem(wxTreeViewItem *tvItem)
+{
+    TreeItemUnlocker unlocker(tvItem->hItem);
+
+    if ( TreeView_SetItem(GetHwnd(), tvItem) == -1 )
+    {
+        wxLogLastError(wxT("TreeView_SetItem"));
+    }
+}
+
+unsigned int wxTreeCtrl::GetCount() const
+{
+    return (unsigned int)TreeView_GetCount(GetHwnd());
+}
+
+unsigned int wxTreeCtrl::GetIndent() const
+{
+    return TreeView_GetIndent(GetHwnd());
+}
+
+void wxTreeCtrl::SetIndent(unsigned int indent)
+{
+    TreeView_SetIndent(GetHwnd(), indent);
+}
+
+void wxTreeCtrl::SetAnyImageList(wxImageList *imageList, int which)
+{
+    // no error return
+    (void) TreeView_SetImageList(GetHwnd(),
+                                 imageList ? imageList->GetHIMAGELIST() : 0,
+                                 which);
+}
+
+void wxTreeCtrl::SetImageList(wxImageList *imageList)
+{
+    if (m_ownsImageListNormal)
+        delete m_imageListNormal;
+
+    SetAnyImageList(m_imageListNormal = imageList, TVSIL_NORMAL);
+    m_ownsImageListNormal = false;
+}
+
+void wxTreeCtrl::SetStateImageList(wxImageList *imageList)
+{
+    if (m_ownsImageListState) delete m_imageListState;
+    SetAnyImageList(m_imageListState = imageList, TVSIL_STATE);
+    m_ownsImageListState = false;
+}
+
+size_t wxTreeCtrl::GetChildrenCount(const wxTreeItemId& item,
+                                    bool recursively) const
+{
+    wxCHECK_MSG( item.IsOk(), 0u, wxT("invalid tree item") );
+
+    TraverseCounter counter(this, item, recursively);
+    return counter.GetCount() - 1;
+}
+
+// ----------------------------------------------------------------------------
+// control colours
+// ----------------------------------------------------------------------------
+
+bool wxTreeCtrl::SetBackgroundColour(const wxColour &colour)
+{
+    if ( !wxWindowBase::SetBackgroundColour(colour) )
+        return false;
+
+    ::SendMessage(GetHwnd(), TVM_SETBKCOLOR, 0, colour.GetPixel());
+
+    return true;
+}
+
+bool wxTreeCtrl::SetForegroundColour(const wxColour &colour)
+{
+    if ( !wxWindowBase::SetForegroundColour(colour) )
+        return false;
+
+    ::SendMessage(GetHwnd(), TVM_SETTEXTCOLOR, 0, colour.GetPixel());
+
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// Item access
+// ----------------------------------------------------------------------------
+
+bool wxTreeCtrl::IsHiddenRoot(const wxTreeItemId& item) const
+{
+    return HITEM(item) == TVI_ROOT && HasFlag(wxTR_HIDE_ROOT);
+}
+
+wxString wxTreeCtrl::GetItemText(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), wxEmptyString, wxT("invalid tree item") );
+
+    wxChar buf[512];  // the size is arbitrary...
+
+    wxTreeViewItem tvItem(item, TVIF_TEXT);
+    tvItem.pszText = buf;
+    tvItem.cchTextMax = WXSIZEOF(buf);
+    if ( !DoGetItem(&tvItem) )
+    {
+        // don't return some garbage which was on stack, but an empty string
+        buf[0] = wxT('\0');
+    }
+
+    return wxString(buf);
+}
+
+void wxTreeCtrl::SetItemText(const wxTreeItemId& item, const wxString& text)
+{
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+
+    if ( IS_VIRTUAL_ROOT(item) )
+        return;
+
+    wxTreeViewItem tvItem(item, TVIF_TEXT);
+    tvItem.pszText = wxMSW_CONV_LPTSTR(text);
+    DoSetItem(&tvItem);
+
+    // when setting the text of the item being edited, the text control should
+    // be updated to reflect the new text as well, otherwise calling
+    // SetItemText() in the OnBeginLabelEdit() handler doesn't have any effect
+    //
+    // don't use GetEditControl() here because m_textCtrl is not set yet
+    HWND hwndEdit = TreeView_GetEditControl(GetHwnd());
+    if ( hwndEdit )
+    {
+        if ( item == m_idEdited )
+        {
+            ::SetWindowText(hwndEdit, text.t_str());
+        }
+    }
+}
+
+int wxTreeCtrl::GetItemImage(const wxTreeItemId& item,
+                             wxTreeItemIcon which) const
+{
+    wxCHECK_MSG( item.IsOk(), -1, wxT("invalid tree item") );
+
+    if ( IsHiddenRoot(item) )
+    {
+        // no images for hidden root item
+        return -1;
+    }
+
+    wxTreeItemParam *param = GetItemParam(item);
+
+    return param && param->HasImage(which) ? param->GetImage(which) : -1;
+}
+
+void wxTreeCtrl::SetItemImage(const wxTreeItemId& item, int image,
+                              wxTreeItemIcon which)
+{
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+    wxCHECK_RET( which >= 0 &&
+                 which < wxTreeItemIcon_Max,
+                 wxT("invalid image index"));
+
+
+    if ( IsHiddenRoot(item) )
+    {
+        // no images for hidden root item
+        return;
+    }
+
+    wxTreeItemParam *data = GetItemParam(item);
+    if ( !data )
+        return;
+
+    data->SetImage(image, which);
+
+    RefreshItem(item);
+}
+
+wxTreeItemParam *wxTreeCtrl::GetItemParam(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), NULL, wxT("invalid tree item") );
+
+    wxTreeViewItem tvItem(item, TVIF_PARAM);
+
+    // hidden root may still have data.
+    if ( IS_VIRTUAL_ROOT(item) )
+    {
+        return GET_VIRTUAL_ROOT()->GetParam();
+    }
+
+    // visible node.
+    if ( !DoGetItem(&tvItem) )
+    {
+        return NULL;
+    }
+
+    return (wxTreeItemParam *)tvItem.lParam;
+}
+
+bool wxTreeCtrl::HandleTreeEvent(wxTreeEvent& event) const
+{
+    if ( event.m_item.IsOk() )
+    {
+        event.SetClientObject(GetItemData(event.m_item));
+    }
+
+    return HandleWindowEvent(event);
+}
+
+wxTreeItemData *wxTreeCtrl::GetItemData(const wxTreeItemId& item) const
+{
+    wxTreeItemParam *data = GetItemParam(item);
+
+    return data ? data->GetData() : NULL;
+}
+
+void wxTreeCtrl::SetItemData(const wxTreeItemId& item, wxTreeItemData *data)
+{
+    // first, associate this piece of data with this item
+    if ( data )
+    {
+        data->SetId(item);
+    }
+
+    wxTreeItemParam *param = GetItemParam(item);
+
+    wxCHECK_RET( param, wxT("failed to change tree items data") );
+
+    param->SetData(data);
+}
+
+void wxTreeCtrl::SetItemHasChildren(const wxTreeItemId& item, bool has)
+{
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+
+    if ( IS_VIRTUAL_ROOT(item) )
+        return;
+
+    wxTreeViewItem tvItem(item, TVIF_CHILDREN);
+    tvItem.cChildren = (int)has;
+    DoSetItem(&tvItem);
+}
+
+void wxTreeCtrl::SetItemBold(const wxTreeItemId& item, bool bold)
+{
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+
+    if ( IS_VIRTUAL_ROOT(item) )
+        return;
+
+    wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_BOLD);
+    tvItem.state = bold ? TVIS_BOLD : 0;
+    DoSetItem(&tvItem);
+}
+
+void wxTreeCtrl::SetItemDropHighlight(const wxTreeItemId& item, bool highlight)
+{
+    if ( IS_VIRTUAL_ROOT(item) )
+        return;
+
+    wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_DROPHILITED);
+    tvItem.state = highlight ? TVIS_DROPHILITED : 0;
+    DoSetItem(&tvItem);
+}
+
+void wxTreeCtrl::RefreshItem(const wxTreeItemId& item)
+{
+    if ( IS_VIRTUAL_ROOT(item) )
+        return;
+
+    wxRect rect;
+    if ( GetBoundingRect(item, rect) )
+    {
+        RefreshRect(rect);
+    }
+}
+
+wxColour wxTreeCtrl::GetItemTextColour(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), wxNullColour, wxT("invalid tree item") );
+
+    wxMapTreeAttr::const_iterator it = m_attrs.find(item.m_pItem);
+    return it == m_attrs.end() ? wxNullColour : it->second->GetTextColour();
+}
+
+wxColour wxTreeCtrl::GetItemBackgroundColour(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), wxNullColour, wxT("invalid tree item") );
+
+    wxMapTreeAttr::const_iterator it = m_attrs.find(item.m_pItem);
+    return it == m_attrs.end() ? wxNullColour : it->second->GetBackgroundColour();
+}
+
+wxFont wxTreeCtrl::GetItemFont(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), wxNullFont, wxT("invalid tree item") );
+
+    wxMapTreeAttr::const_iterator it = m_attrs.find(item.m_pItem);
+    return it == m_attrs.end() ? wxNullFont : it->second->GetFont();
+}
+
+void wxTreeCtrl::SetItemTextColour(const wxTreeItemId& item,
+                                   const wxColour& col)
+{
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+
+    wxTreeItemAttr *attr;
+    wxMapTreeAttr::iterator it = m_attrs.find(item.m_pItem);
+    if ( it == m_attrs.end() )
+    {
+        m_hasAnyAttr = true;
+
+        m_attrs[item.m_pItem] =
+        attr = new wxTreeItemAttr;
+    }
+    else
+    {
+        attr = it->second;
+    }
+
+    attr->SetTextColour(col);
+
+    RefreshItem(item);
+}
+
+void wxTreeCtrl::SetItemBackgroundColour(const wxTreeItemId& item,
+                                         const wxColour& col)
+{
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+
+    wxTreeItemAttr *attr;
+    wxMapTreeAttr::iterator it = m_attrs.find(item.m_pItem);
+    if ( it == m_attrs.end() )
+    {
+        m_hasAnyAttr = true;
+
+        m_attrs[item.m_pItem] =
+        attr = new wxTreeItemAttr;
+    }
+    else // already in the hash
+    {
+        attr = it->second;
+    }
+
+    attr->SetBackgroundColour(col);
+
+    RefreshItem(item);
+}
+
+void wxTreeCtrl::SetItemFont(const wxTreeItemId& item, const wxFont& font)
+{
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+
+    wxTreeItemAttr *attr;
+    wxMapTreeAttr::iterator it = m_attrs.find(item.m_pItem);
+    if ( it == m_attrs.end() )
+    {
+        m_hasAnyAttr = true;
+
+        m_attrs[item.m_pItem] =
+        attr = new wxTreeItemAttr;
+    }
+    else // already in the hash
+    {
+        attr = it->second;
+    }
+
+    attr->SetFont(font);
+
+    // Reset the item's text to ensure that the bounding rect will be adjusted
+    // for the new font.
+    SetItemText(item, GetItemText(item));
+
+    RefreshItem(item);
+}
+
+// ----------------------------------------------------------------------------
+// Item status
+// ----------------------------------------------------------------------------
+
+bool wxTreeCtrl::IsVisible(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), false, wxT("invalid tree item") );
+
+    if ( item == wxTreeItemId(TVI_ROOT) )
+    {
+        // virtual (hidden) root is never visible
+        return false;
+    }
+
+    // Bug in Gnu-Win32 headers, so don't use the macro TreeView_GetItemRect
+    TVGetItemRectParam param;
+
+    // true means to get rect for just the text, not the whole line
+    if ( !wxTreeView_GetItemRect(GetHwnd(), HITEM(item), param, TRUE) )
+    {
+        // if TVM_GETITEMRECT returned false, then the item is definitely not
+        // visible (because its parent is not expanded)
+        return false;
+    }
+
+    // however if it returned true, the item might still be outside the
+    // currently visible part of the tree, test for it (notice that partly
+    // visible means visible here)
+    return param.rect.bottom > 0 && param.rect.top < GetClientSize().y;
+}
+
+bool wxTreeCtrl::ItemHasChildren(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), false, wxT("invalid tree item") );
+
+    if ( IS_VIRTUAL_ROOT(item) )
+    {
+        wxTreeItemIdValue cookie;
+        return GetFirstChild(item, cookie).IsOk();
+    }
+
+    wxTreeViewItem tvItem(item, TVIF_CHILDREN);
+    DoGetItem(&tvItem);
+
+    return tvItem.cChildren != 0;
+}
+
+bool wxTreeCtrl::IsExpanded(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), false, wxT("invalid tree item") );
 
-#ifndef WX_PRECOMP
-#include "wx.h"
-#endif
+    wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_EXPANDED);
+    DoGetItem(&tvItem);
 
-#include "wx/log.h"
+    return (tvItem.state & TVIS_EXPANDED) != 0;
+}
 
-#if defined(__WIN95__)
+bool wxTreeCtrl::IsSelected(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), false, wxT("invalid tree item") );
 
-#include "wx/treectrl.h"
-#include "wx/msw/private.h"
+    wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_SELECTED);
+    DoGetItem(&tvItem);
 
-#ifndef __GNUWIN32__
-#include <commctrl.h>
-#endif
+    return (tvItem.state & TVIS_SELECTED) != 0;
+}
 
-// Bug in headers, sometimes
-#ifndef TVIS_FOCUSED
-#define TVIS_FOCUSED            0x0001
-#endif
+bool wxTreeCtrl::IsBold(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), false, wxT("invalid tree item") );
 
-static void wxConvertToMSWTreeItem(wxTreeItem& info, TV_ITEM& tvItem);
-static void wxConvertFromMSWTreeItem(wxTreeItem& info, TV_ITEM& tvItem, HWND getFullInfo = 0);
+    wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_BOLD);
+    DoGetItem(&tvItem);
 
-#if !USE_SHARED_LIBRARY
-IMPLEMENT_DYNAMIC_CLASS(wxTreeCtrl, wxControl)
-IMPLEMENT_DYNAMIC_CLASS(wxTreeItem, wxObject)
+    return (tvItem.state & TVIS_BOLD) != 0;
+}
 
-#endif
+// ----------------------------------------------------------------------------
+// navigation
+// ----------------------------------------------------------------------------
 
-wxTreeCtrl::wxTreeCtrl(void)
+wxTreeItemId wxTreeCtrl::GetRootItem() const
 {
-  m_imageListNormal = NULL;
-  m_imageListState = NULL;
-  m_textCtrl = NULL;
+    // Root may be real (visible) or virtual (hidden).
+    if ( GET_VIRTUAL_ROOT() )
+        return TVI_ROOT;
+
+    return wxTreeItemId(TreeView_GetRoot(GetHwnd()));
 }
 
-bool wxTreeCtrl::Create(wxWindow *parent, wxWindowID id, const wxPoint& pos, const wxSize& size,
-            long style, const wxValidator& validator, const wxString& name)
+wxTreeItemId wxTreeCtrl::GetSelection() const
 {
-  wxSystemSettings settings;
-  SetBackgroundColour(settings.GetSystemColour(wxSYS_COLOUR_WINDOW));
-  SetForegroundColour(parent->GetDefaultForegroundColour());
-
-  SetName(name);
-  SetValidator(validator);
+    wxCHECK_MSG( !HasFlag(wxTR_MULTIPLE), wxTreeItemId(),
+                 wxT("this only works with single selection controls") );
 
-  m_imageListNormal = NULL;
-  m_imageListState = NULL;
-  m_textCtrl = NULL;
+    return GetFocusedItem();
+}
 
-  int x = pos.x;
-  int y = pos.y;
-  int width = size.x;
-  int height = size.y;
+wxTreeItemId wxTreeCtrl::GetFocusedItem() const
+{
+    return wxTreeItemId(TreeView_GetSelection(GetHwnd()));
+}
 
-  m_windowStyle = style;
+wxTreeItemId wxTreeCtrl::GetItemParent(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), wxTreeItemId(), wxT("invalid tree item") );
 
-//  SetFont(wxTheFontList->FindOrCreateFont(11, wxSWISS, wxNORMAL, wxNORMAL));
+    HTREEITEM hItem;
 
-  SetParent(parent);
+    if ( IS_VIRTUAL_ROOT(item) )
+    {
+        // no parent for the virtual root
+        hItem = 0;
+    }
+    else // normal item
+    {
+        hItem = TreeView_GetParent(GetHwnd(), HITEM(item));
+        if ( !hItem && HasFlag(wxTR_HIDE_ROOT) )
+        {
+            // the top level items should have the virtual root as their parent
+            hItem = TVI_ROOT;
+        }
+    }
 
-  if (width <= 0)
-    width = 100;
-  if (height <= 0)
-    height = 30;
-  if (x < 0)
-    x = 0;
-  if (y < 0)
-    y = 0;
+    return wxTreeItemId(hItem);
+}
 
-  m_windowId = (id == -1) ? NewControlId() : id;
+wxTreeItemId wxTreeCtrl::GetFirstChild(const wxTreeItemId& item,
+                                       wxTreeItemIdValue& cookie) const
+{
+    wxCHECK_MSG( item.IsOk(), wxTreeItemId(), wxT("invalid tree item") );
 
-  DWORD wstyle = WS_VISIBLE | WS_CHILD | WS_TABSTOP | TVS_HASLINES;
-  
-  bool want3D;
-  WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D) ;
+    // remember the last child returned in 'cookie'
+    cookie = TreeView_GetChild(GetHwnd(), HITEM(item));
 
-  // Even with extended styles, need to combine with WS_BORDER
-  // for them to look right.
-  if (want3D || (m_windowStyle & wxSIMPLE_BORDER) || (m_windowStyle & wxRAISED_BORDER) ||
-       (m_windowStyle & wxSUNKEN_BORDER) || (m_windowStyle & wxDOUBLE_BORDER))
-    wstyle |= WS_BORDER;
+    return wxTreeItemId(cookie);
+}
 
-  if ( m_windowStyle & wxTR_HAS_BUTTONS )
-    wstyle |= TVS_HASBUTTONS;
+wxTreeItemId wxTreeCtrl::GetNextChild(const wxTreeItemId& WXUNUSED(item),
+                                      wxTreeItemIdValue& cookie) const
+{
+    wxTreeItemId fromCookie(cookie);
 
-  if ( m_windowStyle & wxTR_EDIT_LABELS )
-    wstyle |= TVS_EDITLABELS;
+    HTREEITEM hitem = HITEM(fromCookie);
 
-  if ( m_windowStyle & wxTR_LINES_AT_ROOT )
-    wstyle |= TVS_LINESATROOT;
+    hitem = TreeView_GetNextSibling(GetHwnd(), hitem);
 
-  // Create the toolbar control.
-  HWND hWndTreeControl = CreateWindowEx(exStyle,
-    WC_TREEVIEW,
-    "",
-    wstyle,
-    x, y, width, height,
-    (HWND) parent->GetHWND(),
-    (HMENU)m_windowId,
-    wxGetInstance(),
-    NULL );
+    wxTreeItemId item(hitem);
 
-  m_hWnd = (WXHWND) hWndTreeControl;
-  if (parent) parent->AddChild(this);
-  
-  SubclassWin((WXHWND) m_hWnd);
+    cookie = item.m_pItem;
 
-  return TRUE;
+    return item;
 }
 
-wxTreeCtrl::~wxTreeCtrl(void)
+wxTreeItemId wxTreeCtrl::GetLastChild(const wxTreeItemId& item) const
 {
-    if (m_textCtrl)
+    wxCHECK_MSG( item.IsOk(), wxTreeItemId(), wxT("invalid tree item") );
+
+    // can this be done more efficiently?
+    wxTreeItemIdValue cookie;
+
+    wxTreeItemId childLast,
+    child = GetFirstChild(item, cookie);
+    while ( child.IsOk() )
     {
-        m_textCtrl->UnsubclassWin();
-        m_textCtrl->SetHWND((WXHWND) 0);
-        delete m_textCtrl;
+        childLast = child;
+        child = GetNextChild(item, cookie);
     }
+
+    return childLast;
 }
 
-// Attributes
-int wxTreeCtrl::GetCount(void) const
+wxTreeItemId wxTreeCtrl::GetNextSibling(const wxTreeItemId& item) const
 {
-  return (int) TreeView_GetCount((HWND) GetHWND());
+    wxCHECK_MSG( item.IsOk(), wxTreeItemId(), wxT("invalid tree item") );
+    return wxTreeItemId(TreeView_GetNextSibling(GetHwnd(), HITEM(item)));
 }
 
-int wxTreeCtrl::GetIndent(void) const
+wxTreeItemId wxTreeCtrl::GetPrevSibling(const wxTreeItemId& item) const
 {
-  return (int) TreeView_GetIndent((HWND) GetHWND());
+    wxCHECK_MSG( item.IsOk(), wxTreeItemId(), wxT("invalid tree item") );
+    return wxTreeItemId(TreeView_GetPrevSibling(GetHwnd(), HITEM(item)));
 }
 
-void wxTreeCtrl::SetIndent(int indent)
+wxTreeItemId wxTreeCtrl::GetFirstVisibleItem() const
 {
-  TreeView_SetIndent((HWND) GetHWND(), indent);
+    return wxTreeItemId(TreeView_GetFirstVisible(GetHwnd()));
 }
 
-wxImageList *wxTreeCtrl::GetImageList(int which) const
+wxTreeItemId wxTreeCtrl::GetNextVisible(const wxTreeItemId& item) const
 {
-  if ( which == wxIMAGE_LIST_NORMAL )
-    {
-    return m_imageListNormal;
-  }
-  else if ( which == wxIMAGE_LIST_STATE )
+    wxCHECK_MSG( item.IsOk(), wxTreeItemId(), wxT("invalid tree item") );
+    wxASSERT_MSG( IsVisible(item), wxT("The item you call GetNextVisible() for must be visible itself!"));
+
+    wxTreeItemId next(TreeView_GetNextVisible(GetHwnd(), HITEM(item)));
+    if ( next.IsOk() && !IsVisible(next) )
     {
-    return m_imageListState;
-  }
-  return NULL;
+        // Win32 considers that any non-collapsed item is visible while we want
+        // to return only really visible items
+        next.Unset();
+    }
+
+    return next;
 }
 
-void wxTreeCtrl::SetImageList(wxImageList *imageList, int which)
+wxTreeItemId wxTreeCtrl::GetPrevVisible(const wxTreeItemId& item) const
 {
-  int flags = 0;
-  if ( which == wxIMAGE_LIST_NORMAL )
-    {
-    flags = TVSIL_NORMAL;
-    m_imageListNormal = imageList;
-  }
-  else if ( which == wxIMAGE_LIST_STATE )
+    wxCHECK_MSG( item.IsOk(), wxTreeItemId(), wxT("invalid tree item") );
+    wxASSERT_MSG( IsVisible(item), wxT("The item you call GetPrevVisible() for must be visible itself!"));
+
+    wxTreeItemId prev(TreeView_GetPrevVisible(GetHwnd(), HITEM(item)));
+    if ( prev.IsOk() && !IsVisible(prev) )
     {
-    flags = TVSIL_STATE;
-    m_imageListState = imageList;
-  }
-  TreeView_SetImageList((HWND) GetHWND(), (HIMAGELIST) imageList ? imageList->GetHIMAGELIST() : 0, flags);
+        // just as above, Win32 function will happily return the previous item
+        // in the tree for the first visible item too
+        prev.Unset();
+    }
+
+    return prev;
 }
 
-long wxTreeCtrl::GetNextItem(long item, int code) const
+// ----------------------------------------------------------------------------
+// multiple selections emulation
+// ----------------------------------------------------------------------------
+
+size_t wxTreeCtrl::GetSelections(wxArrayTreeItemIds& selections) const
 {
-  UINT flag = 0;
-  switch ( code )
-  {
-    case wxTREE_NEXT_CARET:
-      flag = TVGN_CARET;
-      break;
-    case wxTREE_NEXT_CHILD:
-      flag = TVGN_CHILD;
-      break;
-    case wxTREE_NEXT_DROPHILITE:
-      flag = TVGN_DROPHILITE;
-      break;
-    case wxTREE_NEXT_FIRSTVISIBLE:
-      flag = TVGN_FIRSTVISIBLE;
-      break;
-    case wxTREE_NEXT_NEXT:
-      flag = TVGN_NEXT;
-      break;
-    case wxTREE_NEXT_NEXTVISIBLE:
-      flag = TVGN_NEXTVISIBLE;
-      break;
-    case wxTREE_NEXT_PARENT:
-      flag = TVGN_PARENT;
-      break;
-    case wxTREE_NEXT_PREVIOUS:
-      flag = TVGN_PREVIOUS;
-      break;
-    case wxTREE_NEXT_PREVIOUSVISIBLE:
-      flag = TVGN_PREVIOUSVISIBLE;
-      break;
-    case wxTREE_NEXT_ROOT:
-      flag = TVGN_ROOT;
-      break;
+    TraverseSelections selector(this, selections);
 
-    default :
-      break;
-  }
-  return (long) TreeView_GetNextItem( (HWND) GetHWND(), (HTREEITEM) item, flag);
+    return selector.GetCount();
 }
 
-bool wxTreeCtrl::ItemHasChildren(long item) const
-{
-  TV_ITEM item2;
-  item2.hItem = (HTREEITEM) item;
-  item2.mask = TVIF_CHILDREN;
-  TreeView_GetItem((HWND) GetHWND(), &item2);
-  return (item2.cChildren != 0);
-}
+// ----------------------------------------------------------------------------
+// Usual operations
+// ----------------------------------------------------------------------------
 
-long wxTreeCtrl::GetChild(long item) const
+wxTreeItemId wxTreeCtrl::DoInsertAfter(const wxTreeItemId& parent,
+                                       const wxTreeItemId& hInsertAfter,
+                                       const wxString& text,
+                                       int image, int selectedImage,
+                                       wxTreeItemData *data)
 {
-  return (long) ::SendMessage((HWND) GetHWND(), TVM_GETNEXTITEM, TVGN_CHILD, (LPARAM)item);
-}
+    wxCHECK_MSG( parent.IsOk() || !TreeView_GetRoot(GetHwnd()),
+                 wxTreeItemId(),
+                 wxT("can't have more than one root in the tree") );
 
-long wxTreeCtrl::GetParent(long item) const
-{
-  return (long) ::SendMessage((HWND) GetHWND(), TVM_GETNEXTITEM, TVGN_PARENT, (LPARAM)item);
+    TV_INSERTSTRUCT tvIns;
+    tvIns.hParent = HITEM(parent);
+    tvIns.hInsertAfter = HITEM(hInsertAfter);
+
+    // this is how we insert the item as the first child: supply a NULL
+    // hInsertAfter
+    if ( !tvIns.hInsertAfter )
+    {
+        tvIns.hInsertAfter = TVI_FIRST;
+    }
+
+    UINT mask = 0;
+    if ( !text.empty() )
+    {
+        mask |= TVIF_TEXT;
+        tvIns.item.pszText = wxMSW_CONV_LPTSTR(text);
+    }
+    else
+    {
+        tvIns.item.pszText = NULL;
+        tvIns.item.cchTextMax = 0;
+    }
+
+    // create the param which will store the other item parameters
+    wxTreeItemParam *param = new wxTreeItemParam;
+
+    // we return the images on demand as they depend on whether the item is
+    // expanded or collapsed too in our case
+    mask |= TVIF_IMAGE | TVIF_SELECTEDIMAGE;
+    tvIns.item.iImage = I_IMAGECALLBACK;
+    tvIns.item.iSelectedImage = I_IMAGECALLBACK;
+
+    param->SetImage(image, wxTreeItemIcon_Normal);
+    param->SetImage(selectedImage, wxTreeItemIcon_Selected);
+
+    mask |= TVIF_PARAM;
+    tvIns.item.lParam = (LPARAM)param;
+    tvIns.item.mask = mask;
+
+    // don't use the hack below for the children of hidden root: this results
+    // in a crash inside comctl32.dll when we call TreeView_GetItemRect()
+    const bool firstChild = !IsHiddenRoot(parent) &&
+                                !TreeView_GetChild(GetHwnd(), HITEM(parent));
+
+    HTREEITEM id = TreeView_InsertItem(GetHwnd(), &tvIns);
+    if ( id == 0 )
+    {
+        wxLogLastError(wxT("TreeView_InsertItem"));
+    }
+
+    // apparently some Windows versions (2000 and XP are reported to do this)
+    // sometimes don't refresh the tree after adding the first child and so we
+    // need this to make the "[+]" appear
+    if ( firstChild )
+    {
+        TVGetItemRectParam param;
+
+        wxTreeView_GetItemRect(GetHwnd(), HITEM(parent), param, FALSE);
+        ::InvalidateRect(GetHwnd(), &param.rect, FALSE);
+    }
+
+    // associate the application tree item with Win32 tree item handle
+    param->SetItem(id);
+
+    // setup wxTreeItemData
+    if ( data != NULL )
+    {
+        param->SetData(data);
+        data->SetId(id);
+    }
+
+    return wxTreeItemId(id);
 }
 
-long wxTreeCtrl::GetFirstVisibleItem(void) const
+wxTreeItemId wxTreeCtrl::AddRoot(const wxString& text,
+                                 int image, int selectedImage,
+                                 wxTreeItemData *data)
 {
-  return (long) ::SendMessage((HWND) GetHWND(), TVM_GETNEXTITEM, TVGN_FIRSTVISIBLE, 0);
+    if ( HasFlag(wxTR_HIDE_ROOT) )
+    {
+        wxASSERT_MSG( !m_pVirtualRoot, wxT("tree can have only a single root") );
+
+        // create a virtual root item, the parent for all the others
+        wxTreeItemParam *param = new wxTreeItemParam;
+        param->SetData(data);
+
+        m_pVirtualRoot = new wxVirtualNode(param);
+
+        return TVI_ROOT;
+    }
+
+    return DoInsertAfter(wxTreeItemId(), wxTreeItemId(),
+                           text, image, selectedImage, data);
 }
 
-long wxTreeCtrl::GetNextVisibleItem(long item) const
+wxTreeItemId wxTreeCtrl::DoInsertItem(const wxTreeItemId& parent,
+                                      size_t index,
+                                      const wxString& text,
+                                      int image, int selectedImage,
+                                      wxTreeItemData *data)
 {
-  return (long) ::SendMessage((HWND) GetHWND(), TVM_GETNEXTITEM, TVGN_NEXTVISIBLE, (LPARAM)item);
+    wxTreeItemId idPrev;
+    if ( index == (size_t)-1 )
+    {
+        // special value: append to the end
+        idPrev = TVI_LAST;
+    }
+    else // find the item from index
+    {
+        wxTreeItemIdValue cookie;
+        wxTreeItemId idCur = GetFirstChild(parent, cookie);
+        while ( index != 0 && idCur.IsOk() )
+        {
+            index--;
+
+            idPrev = idCur;
+            idCur = GetNextChild(parent, cookie);
+        }
+
+        // assert, not check: if the index is invalid, we will append the item
+        // to the end
+        wxASSERT_MSG( index == 0, wxT("bad index in wxTreeCtrl::InsertItem") );
+    }
+
+    return DoInsertAfter(parent, idPrev, text, image, selectedImage, data);
 }
 
-long wxTreeCtrl::GetSelection(void) const
+void wxTreeCtrl::Delete(const wxTreeItemId& item)
 {
-  return (long) ::SendMessage((HWND) GetHWND(), TVM_GETNEXTITEM, TVGN_CARET, 0);
+    // unlock tree selections on vista, without this the
+    // tree ctrl will eventually crash after item deletion
+    TreeItemUnlocker unlock_all;
+
+    if ( HasFlag(wxTR_MULTIPLE) )
+    {
+        bool selected = IsSelected(item);
+        wxTreeItemId next;
+
+        if ( selected )
+        {
+            next = TreeView_GetNextVisible(GetHwnd(), HITEM(item));
+
+            if ( !next.IsOk() )
+            {
+                next = TreeView_GetPrevVisible(GetHwnd(), HITEM(item));
+            }
+        }
+
+        {
+            TempSetter set(m_changingSelection);
+            if ( !TreeView_DeleteItem(GetHwnd(), HITEM(item)) )
+            {
+                wxLogLastError(wxT("TreeView_DeleteItem"));
+                return;
+            }
+        }
+
+        if ( !selected )
+        {
+            return;
+        }
+
+        if ( item == m_htSelStart )
+            m_htSelStart.Unset();
+
+        if ( item == m_htClickedItem )
+            m_htClickedItem.Unset();
+
+        if ( next.IsOk() )
+        {
+            wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING, this, next);
+
+            if ( IsTreeEventAllowed(changingEvent) )
+            {
+                wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED, this, next);
+                (void)HandleTreeEvent(changedEvent);
+            }
+            else
+            {
+                DoUnselectItem(next);
+                ClearFocusedItem();
+            }
+        }
+    }
+    else
+    {
+        if ( !TreeView_DeleteItem(GetHwnd(), HITEM(item)) )
+        {
+            wxLogLastError(wxT("TreeView_DeleteItem"));
+        }
+    }
 }
 
-long wxTreeCtrl::GetRootItem(void) const
+// delete all children (but don't delete the item itself)
+void wxTreeCtrl::DeleteChildren(const wxTreeItemId& item)
 {
-  return (long) ::SendMessage((HWND) GetHWND(), TVM_GETNEXTITEM, TVGN_ROOT, 0);
+    // unlock tree selections on vista for the duration of this call
+    TreeItemUnlocker unlock_all;
+
+    wxTreeItemIdValue cookie;
+
+    wxArrayTreeItemIds children;
+    wxTreeItemId child = GetFirstChild(item, cookie);
+    while ( child.IsOk() )
+    {
+        children.Add(child);
+
+        child = GetNextChild(item, cookie);
+    }
+
+    size_t nCount = children.Count();
+    for ( size_t n = 0; n < nCount; n++ )
+    {
+        Delete(children[n]);
+    }
 }
 
-bool wxTreeCtrl::GetItem(wxTreeItem& info) const
+void wxTreeCtrl::DeleteAllItems()
 {
-  TV_ITEM tvItem;
-  tvItem.hItem   = (HTREEITEM)info.m_itemId;
-  tvItem.pszText = NULL;
-  tvItem.mask    = 
-  tvItem.stateMask = 0;
+    // unlock tree selections on vista for the duration of this call
+    TreeItemUnlocker unlock_all;
 
-  // TODO: convert other bits in the mask
-  if ( info.m_mask & wxTREE_MASK_TEXT )
-  {
-    tvItem.mask |= TVIF_TEXT;
-    tvItem.pszText = new char[513];
-    tvItem.cchTextMax = 512;
-  }
-  if ( info.m_mask & wxTREE_MASK_DATA )
-    tvItem.mask |= TVIF_PARAM;
-  if ( info.m_stateMask & wxTREE_STATE_EXPANDED ) {
-    tvItem.mask |= TVIF_STATE;
-    tvItem.stateMask |= TVIS_EXPANDED;
-  }
+    // invalidate all the items we store as they're going to become invalid
+    m_htSelStart =
+    m_htClickedItem = wxTreeItemId();
 
-  bool success = TreeView_GetItem((HWND)GetHWND(), &tvItem) != 0;
+    // delete the "virtual" root item.
+    if ( GET_VIRTUAL_ROOT() )
+    {
+        delete GET_VIRTUAL_ROOT();
+        m_pVirtualRoot = NULL;
+    }
 
-  if ( !success )
-  {
-    wxLogSysError("TreeView_GetItem failed");
+    // and all the real items
 
-    if (tvItem.pszText)
-      delete[] tvItem.pszText;
+    if ( !TreeView_DeleteAllItems(GetHwnd()) )
+    {
+        wxLogLastError(wxT("TreeView_DeleteAllItems"));
+    }
+}
 
-    return FALSE;
-  }
+void wxTreeCtrl::DoExpand(const wxTreeItemId& item, int flag)
+{
+    wxASSERT_MSG( flag == TVE_COLLAPSE ||
+                  flag == (TVE_COLLAPSE | TVE_COLLAPSERESET) ||
+                  flag == TVE_EXPAND   ||
+                  flag == TVE_TOGGLE,
+                  wxT("Unknown flag in wxTreeCtrl::DoExpand") );
+
+    // A hidden root can be neither expanded nor collapsed.
+    wxCHECK_RET( !IsHiddenRoot(item),
+                 wxT("Can't expand/collapse hidden root node!") );
+
+    // TreeView_Expand doesn't send TVN_ITEMEXPAND(ING) messages, so we must
+    // emulate them. This behaviour has changed slightly with comctl32.dll
+    // v 4.70 - now it does send them but only the first time. To maintain
+    // compatible behaviour and also in order to not have surprises with the
+    // future versions, don't rely on this and still do everything ourselves.
+    // To avoid that the messages be sent twice when the item is expanded for
+    // the first time we must clear TVIS_EXPANDEDONCE style manually.
+
+    wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_EXPANDEDONCE);
+    tvItem.state = 0;
+    DoSetItem(&tvItem);
+
+    if ( IsExpanded(item) )
+    {
+        wxTreeEvent event(wxEVT_COMMAND_TREE_ITEM_COLLAPSING,
+                          this, wxTreeItemId(item));
 
-  wxConvertFromMSWTreeItem(info, tvItem);
+        if ( !IsTreeEventAllowed(event) )
+            return;
+    }
 
-  if (tvItem.pszText)
-    delete[] tvItem.pszText;
+    if ( TreeView_Expand(GetHwnd(), HITEM(item), flag) )
+    {
+        if ( IsExpanded(item) )
+            return;
 
-  return success;
+        wxTreeEvent event(wxEVT_COMMAND_TREE_ITEM_COLLAPSED, this, item);
+        (void)HandleTreeEvent(event);
+    }
+    //else: change didn't took place, so do nothing at all
 }
 
-bool wxTreeCtrl::SetItem(wxTreeItem& info)
+void wxTreeCtrl::Expand(const wxTreeItemId& item)
 {
-  TV_ITEM item;
-    wxConvertToMSWTreeItem(info, item);
-  return (::SendMessage((HWND) GetHWND(), TVM_SETITEM, 0, (LPARAM)&item) != 0);
+    DoExpand(item, TVE_EXPAND);
 }
 
-int wxTreeCtrl::GetItemState(long item, long stateMask) const
+void wxTreeCtrl::Collapse(const wxTreeItemId& item)
 {
-  wxTreeItem info;
-
-  info.m_mask = wxTREE_MASK_STATE ;
-  info.m_stateMask = stateMask;
-  info.m_itemId = item;
+    DoExpand(item, TVE_COLLAPSE);
+}
 
-  if (!GetItem(info))
-    return 0;
+void wxTreeCtrl::CollapseAndReset(const wxTreeItemId& item)
+{
+    DoExpand(item, TVE_COLLAPSE | TVE_COLLAPSERESET);
+}
 
-  return info.m_state;
+void wxTreeCtrl::Toggle(const wxTreeItemId& item)
+{
+    DoExpand(item, TVE_TOGGLE);
 }
 
-bool wxTreeCtrl::SetItemState(long item, long state, long stateMask)
+void wxTreeCtrl::Unselect()
 {
-  wxTreeItem info;
+    wxASSERT_MSG( !HasFlag(wxTR_MULTIPLE),
+                  wxT("doesn't make sense, may be you want UnselectAll()?") );
+
+    // the current focus
+    HTREEITEM htFocus = (HTREEITEM)TreeView_GetSelection(GetHwnd());
 
-  info.m_mask = wxTREE_MASK_STATE ;
-  info.m_state = state;
-  info.m_stateMask = stateMask;
-  info.m_itemId = item;
+    if ( !htFocus )
+    {
+        return;
+    }
 
-  return SetItem(info);
+    if ( HasFlag(wxTR_MULTIPLE) )
+    {
+        wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                  this, wxTreeItemId());
+        changingEvent.m_itemOld = htFocus;
+
+        if ( IsTreeEventAllowed(changingEvent) )
+        {
+            ClearFocusedItem();
+
+            wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                     this, wxTreeItemId());
+            changedEvent.m_itemOld = htFocus;
+            (void)HandleTreeEvent(changedEvent);
+        }
+    }
+    else
+    {
+        ClearFocusedItem();
+    }
 }
 
-bool wxTreeCtrl::SetItemImage(long item, int image, int selImage)
+void wxTreeCtrl::DoUnselectAll()
 {
-  wxTreeItem info;
+    wxArrayTreeItemIds selections;
+    size_t count = GetSelections(selections);
 
-  info.m_mask = wxTREE_MASK_IMAGE ;
-  info.m_image = image;
-  if ( selImage > -1)
-  {
-    info.m_selectedImage = selImage;
-    info.m_mask |= wxTREE_MASK_SELECTED_IMAGE;
-  }
-  info.m_itemId = item;
+    for ( size_t n = 0; n < count; n++ )
+    {
+        DoUnselectItem(selections[n]);
+    }
 
-  return SetItem(info);
+    m_htSelStart.Unset();
 }
 
-wxString wxTreeCtrl::GetItemText(long item) const
+void wxTreeCtrl::UnselectAll()
 {
-  wxTreeItem info;
+    if ( HasFlag(wxTR_MULTIPLE) )
+    {
+        HTREEITEM htFocus = (HTREEITEM)TreeView_GetSelection(GetHwnd());
+        if ( !htFocus ) return;
+
+        wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING, this);
+        changingEvent.m_itemOld = htFocus;
+
+        if ( IsTreeEventAllowed(changingEvent) )
+        {
+            DoUnselectAll();
 
-  info.m_mask = wxTREE_MASK_TEXT ;
-  info.m_itemId = item;
+            wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED, this);
+            changedEvent.m_itemOld = htFocus;
+            (void)HandleTreeEvent(changedEvent);
+        }
+    }
+    else
+    {
+        Unselect();
+    }
+}
+
+void wxTreeCtrl::DoSelectChildren(const wxTreeItemId& parent)
+{
+    DoUnselectAll();
 
-  if (!GetItem(info))
-    return wxString("");
-  return info.m_text;
+    wxTreeItemIdValue cookie;
+    wxTreeItemId child = GetFirstChild(parent, cookie);
+    while ( child.IsOk() )
+    {
+        DoSelectItem(child, true);
+        child = GetNextChild(child, cookie);
+    }
 }
 
-void wxTreeCtrl::SetItemText(long item, const wxString& str)
+void wxTreeCtrl::SelectChildren(const wxTreeItemId& parent)
 {
-  wxTreeItem info;
+    wxCHECK_RET( HasFlag(wxTR_MULTIPLE),
+                 "this only works with multiple selection controls" );
+
+    HTREEITEM htFocus = (HTREEITEM)TreeView_GetSelection(GetHwnd());
 
-  info.m_mask = wxTREE_MASK_TEXT ;
-  info.m_itemId = item;
-  info.m_text = str;
+    wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING, this);
+    changingEvent.m_itemOld = htFocus;
+
+    if ( IsTreeEventAllowed(changingEvent) )
+    {
+        DoSelectChildren(parent);
 
-  SetItem(info);
+        wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED, this);
+        changedEvent.m_itemOld = htFocus;
+        (void)HandleTreeEvent(changedEvent);
+    }
 }
 
-long wxTreeCtrl::GetItemData(long item) const
+void wxTreeCtrl::DoSelectItem(const wxTreeItemId& item, bool select)
 {
-  wxTreeItem info;
-
-  info.m_mask = wxTREE_MASK_DATA ;
-  info.m_itemId = item;
+    TempSetter set(m_changingSelection);
 
-  if (!GetItem(info))
-    return 0;
-  return info.m_data;
+    ::SelectItem(GetHwnd(), HITEM(item), select);
 }
 
-bool wxTreeCtrl::SetItemData(long item, long data)
+void wxTreeCtrl::SelectItem(const wxTreeItemId& item, bool select)
 {
-  wxTreeItem info;
+    wxCHECK_RET( !IsHiddenRoot(item), wxT("can't select hidden root item") );
 
-  info.m_mask = wxTREE_MASK_DATA ;
-  info.m_itemId = item;
-  info.m_data = data;
+    if ( select == IsSelected(item) )
+    {
+        // nothing to do, the item is already in the requested state
+        return;
+    }
 
-  return SetItem(info);
+    if ( HasFlag(wxTR_MULTIPLE) )
+    {
+        wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING, this, item);
+
+        if ( IsTreeEventAllowed(changingEvent) )
+        {
+            HTREEITEM htFocus = (HTREEITEM)TreeView_GetSelection(GetHwnd());
+            DoSelectItem(item, select);
+
+            if ( !htFocus )
+            {
+                SetFocusedItem(item);
+            }
+
+            wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                     this, item);
+            (void)HandleTreeEvent(changedEvent);
+        }
+    }
+    else // single selection
+    {
+        wxTreeItemId itemOld, itemNew;
+        if ( select )
+        {
+            itemOld = GetSelection();
+            itemNew = item;
+        }
+        else // deselecting the currently selected item
+        {
+            itemOld = item;
+            // leave itemNew invalid
+        }
+
+        // Recent versions of comctl32.dll send TVN_SELCHANG{ED,ING} events
+        // when we call TreeView_SelectItem() but apparently some old ones did
+        // not so send the events ourselves and ignore those generated by
+        // TreeView_SelectItem() if m_changingSelection is set.
+        wxTreeEvent
+            changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING, this, itemNew);
+        changingEvent.SetOldItem(itemOld);
+
+        if ( IsTreeEventAllowed(changingEvent) )
+        {
+            TempSetter set(m_changingSelection);
+
+            if ( !TreeView_SelectItem(GetHwnd(), HITEM(itemNew)) )
+            {
+                wxLogLastError(wxT("TreeView_SelectItem"));
+            }
+            else // ok
+            {
+                ::SetFocus(GetHwnd(), HITEM(item));
+
+                wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                         this, itemNew);
+                changedEvent.SetOldItem(itemOld);
+                (void)HandleTreeEvent(changedEvent);
+            }
+        }
+        //else: program vetoed the change
+    }
 }
 
-bool wxTreeCtrl::GetItemRect(long item, wxRectangle& rect, bool textOnly) const
+void wxTreeCtrl::EnsureVisible(const wxTreeItemId& item)
 {
-  RECT rect2;
+    wxCHECK_RET( !IsHiddenRoot(item), wxT("can't show hidden root item") );
 
-  *(HTREEITEM*)& rect2 = (HTREEITEM) item;
-  bool success = (::SendMessage((HWND) GetHWND(), TVM_GETITEMRECT, (WPARAM)textOnly,
-    (LPARAM)&rect2) != 0);
+    // no error return
+    TreeView_EnsureVisible(GetHwnd(), HITEM(item));
+}
 
-  rect.x = rect2.left;
-  rect.y = rect2.top;
-  rect.width = rect2.right - rect2.left;
-  rect.height = rect2.bottom - rect2.left;
-  return success;
+void wxTreeCtrl::ScrollTo(const wxTreeItemId& item)
+{
+    if ( !TreeView_SelectSetFirstVisible(GetHwnd(), HITEM(item)) )
+    {
+        wxLogLastError(wxT("TreeView_SelectSetFirstVisible"));
+    }
 }
 
-wxTextCtrl* wxTreeCtrl::GetEditControl(void) const
+wxTextCtrl *wxTreeCtrl::GetEditControl() const
 {
     return m_textCtrl;
 }
 
-// Operations
-bool wxTreeCtrl::DeleteItem(long item)
+void wxTreeCtrl::DeleteTextCtrl()
 {
-  return (TreeView_DeleteItem((HWND) GetHWND(), (HTREEITEM) item) != 0);
+    if ( m_textCtrl )
+    {
+        // the HWND corresponding to this control is deleted by the tree
+        // control itself and we don't know when exactly this happens, so check
+        // if the window still exists before calling UnsubclassWin()
+        if ( !::IsWindow(GetHwndOf(m_textCtrl)) )
+        {
+            m_textCtrl->SetHWND(0);
+        }
+
+        m_textCtrl->UnsubclassWin();
+        m_textCtrl->SetHWND(0);
+        wxDELETE(m_textCtrl);
+
+        m_idEdited.Unset();
+    }
 }
 
-bool wxTreeCtrl::ExpandItem(long item, int action)
+wxTextCtrl *wxTreeCtrl::EditLabel(const wxTreeItemId& item,
+                                  wxClassInfo *textControlClass)
 {
-  UINT mswAction = TVE_EXPAND;
-  switch ( action )
-  {
-    case wxTREE_EXPAND_EXPAND:
-      mswAction = TVE_EXPAND;
-      break;
+    wxASSERT( textControlClass->IsKindOf(wxCLASSINFO(wxTextCtrl)) );
+
+    DeleteTextCtrl();
 
-    case wxTREE_EXPAND_COLLAPSE:
-      mswAction = TVE_COLLAPSE;
-      break;
+    m_idEdited = item;
+    m_textCtrl = (wxTextCtrl *)textControlClass->CreateObject();
+    HWND hWnd = (HWND) TreeView_EditLabel(GetHwnd(), HITEM(item));
+
+    // this is not an error - the TVN_BEGINLABELEDIT handler might have
+    // returned false
+    if ( !hWnd )
+    {
+        wxDELETE(m_textCtrl);
+        return NULL;
+    }
 
-    case wxTREE_EXPAND_COLLAPSE_RESET:
-      // @@@ it should also delete all the items! currently, if you do use this
-      //     code your program will probaly crash. Feel free to remove this if
-      //     it does work
-      wxFAIL_MSG("wxTREE_EXPAND_COLLAPSE_RESET probably doesn't work.");
-      mswAction = TVE_COLLAPSERESET;
-      break;
+    // textctrl is subclassed in MSWOnNotify
+    return m_textCtrl;
+}
 
-    case wxTREE_EXPAND_TOGGLE:
-      mswAction = TVE_TOGGLE;
-      break;
+// End label editing, optionally cancelling the edit
+void wxTreeCtrl::DoEndEditLabel(bool discardChanges)
+{
+    TreeView_EndEditLabelNow(GetHwnd(), discardChanges);
 
-    default:
-      wxFAIL_MSG("unknown action in wxTreeCtrl::ExpandItem");
-  }
+    DeleteTextCtrl();
+}
 
-  bool bOk = TreeView_Expand((HWND)GetHWND(), (HTREEITEM)item, mswAction) != 0;
+wxTreeItemId wxTreeCtrl::DoTreeHitTest(const wxPoint& point, int& flags) const
+{
+    TV_HITTESTINFO hitTestInfo;
+    hitTestInfo.pt.x = (int)point.x;
+    hitTestInfo.pt.y = (int)point.y;
 
-  // TreeView_Expand doesn't send TVN_EXPAND(ING) messages, so emulate them
-  if ( bOk ) {
-    wxTreeEvent event(wxEVT_NULL, m_windowId);
-    event.m_item.m_itemId  = item;
-    event.m_item.m_mask      =
-    event.m_item.m_stateMask = 0xffff; // get all
-    GetItem(event.m_item);
+    (void) TreeView_HitTest(GetHwnd(), &hitTestInfo);
 
-    bool bIsExpanded = (event.m_item.m_state & wxTREE_STATE_EXPANDED) != 0;
+    flags = 0;
 
-    event.m_code = action;
-    event.SetEventObject(this);
+    // avoid repetition
+    #define TRANSLATE_FLAG(flag) if ( hitTestInfo.flags & TVHT_##flag ) \
+                                    flags |= wxTREE_HITTEST_##flag
 
-    // @@@ return values of {EXPAND|COLLAPS}ING event handler is discarded
-    event.SetEventType(bIsExpanded ? wxEVT_COMMAND_TREE_ITEM_EXPANDING
-                                   : wxEVT_COMMAND_TREE_ITEM_COLLAPSING);
-    GetEventHandler()->ProcessEvent(event);
+    TRANSLATE_FLAG(ABOVE);
+    TRANSLATE_FLAG(BELOW);
+    TRANSLATE_FLAG(NOWHERE);
+    TRANSLATE_FLAG(ONITEMBUTTON);
+    TRANSLATE_FLAG(ONITEMICON);
+    TRANSLATE_FLAG(ONITEMINDENT);
+    TRANSLATE_FLAG(ONITEMLABEL);
+    TRANSLATE_FLAG(ONITEMRIGHT);
+    TRANSLATE_FLAG(ONITEMSTATEICON);
+    TRANSLATE_FLAG(TOLEFT);
+    TRANSLATE_FLAG(TORIGHT);
 
-    event.SetEventType(bIsExpanded ? wxEVT_COMMAND_TREE_ITEM_EXPANDED
-                                   : wxEVT_COMMAND_TREE_ITEM_COLLAPSED);
-    GetEventHandler()->ProcessEvent(event);
-  }
+    #undef TRANSLATE_FLAG
 
-  return bOk;
+    return wxTreeItemId(hitTestInfo.hItem);
 }
 
-long wxTreeCtrl::InsertItem(long parent, wxTreeItem& info, long insertAfter)
+bool wxTreeCtrl::GetBoundingRect(const wxTreeItemId& item,
+                                 wxRect& rect,
+                                 bool textOnly) const
 {
-  TV_INSERTSTRUCT tvInsertStruct;
-  tvInsertStruct.hParent = (HTREEITEM) parent ;
-  tvInsertStruct.hInsertAfter = (HTREEITEM) insertAfter ;
+    // Virtual root items have no bounding rectangle
+    if ( IS_VIRTUAL_ROOT(item) )
+    {
+        return false;
+    }
 
-  wxConvertToMSWTreeItem(info, tvInsertStruct.item);
+    TVGetItemRectParam param;
+
+    if ( wxTreeView_GetItemRect(GetHwnd(), HITEM(item), param, textOnly) )
+    {
+        rect = wxRect(wxPoint(param.rect.left, param.rect.top),
+                      wxPoint(param.rect.right, param.rect.bottom));
 
-  return (long) TreeView_InsertItem((HWND) GetHWND(), & tvInsertStruct);
+        return true;
+    }
+    else
+    {
+        // couldn't retrieve rect: for example, item isn't visible
+        return false;
+    }
 }
 
-long wxTreeCtrl::InsertItem(long parent, const wxString& label, int image, int selImage,
-  long insertAfter)
+void wxTreeCtrl::ClearFocusedItem()
 {
-  wxTreeItem info;
-  info.m_text = label;
-  info.m_mask = wxTREE_MASK_TEXT;
-  if ( image > -1 )
-  {
-    info.m_mask |= wxTREE_MASK_IMAGE | wxTREE_MASK_SELECTED_IMAGE;
-    info.m_image = image;
-    if ( selImage == -1 )
-      info.m_selectedImage = image;
-    else
-      info.m_selectedImage = selImage;
-  }
+    TempSetter set(m_changingSelection);
 
-  return InsertItem(parent, info, insertAfter);
+    if ( !TreeView_SelectItem(GetHwnd(), 0) )
+    {
+        wxLogLastError(wxT("TreeView_SelectItem"));
+    }
 }
 
-bool wxTreeCtrl::SelectItem(long item)
+void wxTreeCtrl::SetFocusedItem(const wxTreeItemId& item)
 {
-  return (TreeView_SelectItem((HWND) GetHWND(), (HTREEITEM) item) != 0);
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+
+    TempSetter set(m_changingSelection);
+
+    ::SetFocus(GetHwnd(), HITEM(item));
 }
 
-bool wxTreeCtrl::ScrollTo(long item)
+void wxTreeCtrl::DoUnselectItem(const wxTreeItemId& item)
 {
-  return (TreeView_SelectSetFirstVisible((HWND) GetHWND(), (HTREEITEM) item) != 0);
+    TempSetter set(m_changingSelection);
+
+    ::UnselectItem(GetHwnd(), HITEM(item));
 }
 
-bool wxTreeCtrl::DeleteAllItems(void)
+void wxTreeCtrl::DoToggleItemSelection(const wxTreeItemId& item)
 {
-  return (TreeView_DeleteAllItems((HWND) GetHWND()) != 0);
+    TempSetter set(m_changingSelection);
+
+    ::ToggleItemSelection(GetHwnd(), HITEM(item));
 }
 
-wxTextCtrl* wxTreeCtrl::EditLabel(long item, wxClassInfo* textControlClass)
-{
-    wxASSERT( (textControlClass->IsKindOf(CLASSINFO(wxTextCtrl))) );
+// ----------------------------------------------------------------------------
+// sorting stuff
+// ----------------------------------------------------------------------------
 
-    HWND hWnd = (HWND) TreeView_EditLabel((HWND) GetHWND(), item);
+// this is just a tiny namespace which is friend to wxTreeCtrl and so can use
+// functions such as IsDataIndirect()
+class wxTreeSortHelper
+{
+public:
+    static int CALLBACK Compare(LPARAM data1, LPARAM data2, LPARAM tree);
 
-    if (m_textCtrl)
+private:
+    static wxTreeItemId GetIdFromData(LPARAM lParam)
     {
-      m_textCtrl->UnsubclassWin();
-      m_textCtrl->SetHWND(0);
-      delete m_textCtrl;
-      m_textCtrl = NULL;
-    }
+        return ((wxTreeItemParam*)lParam)->GetItem();
+        }
+};
 
-    m_textCtrl = (wxTextCtrl*) textControlClass->CreateObject();
-    m_textCtrl->SetHWND((WXHWND) hWnd);
-    m_textCtrl->SubclassWin((WXHWND) hWnd);
+int CALLBACK wxTreeSortHelper::Compare(LPARAM pItem1,
+                                       LPARAM pItem2,
+                                       LPARAM htree)
+{
+    wxCHECK_MSG( pItem1 && pItem2, 0,
+                 wxT("sorting tree without data doesn't make sense") );
 
-    return m_textCtrl;
+    wxTreeCtrl *tree = (wxTreeCtrl *)htree;
+
+    return tree->OnCompareItems(GetIdFromData(pItem1),
+                                GetIdFromData(pItem2));
 }
 
-// End label editing, optionally cancelling the edit
-bool wxTreeCtrl::EndEditLabel(bool cancel)
+void wxTreeCtrl::SortChildren(const wxTreeItemId& item)
 {
-    bool success = (TreeView_EndEditLabelNow((HWND) GetHWND(), cancel) != 0);
-
-    if (m_textCtrl)
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
+
+    // rely on the fact that TreeView_SortChildren does the same thing as our
+    // default behaviour, i.e. sorts items alphabetically and so call it
+    // directly if we're not in derived class (much more efficient!)
+    // RN: Note that if you find you're code doesn't sort as expected this
+    //     may be why as if you don't use the DECLARE_CLASS/IMPLEMENT_CLASS
+    //     combo for your derived wxTreeCtrl if will sort without
+    //     OnCompareItems
+    if ( GetClassInfo() == wxCLASSINFO(wxTreeCtrl) )
+    {
+        TreeView_SortChildren(GetHwnd(), HITEM(item), 0);
+    }
+    else
     {
-      m_textCtrl->UnsubclassWin();
-      m_textCtrl->SetHWND(0);
-      delete m_textCtrl;
-      m_textCtrl = NULL;
+        TV_SORTCB tvSort;
+        tvSort.hParent = HITEM(item);
+        tvSort.lpfnCompare = wxTreeSortHelper::Compare;
+        tvSort.lParam = (LPARAM)this;
+        TreeView_SortChildrenCB(GetHwnd(), &tvSort, 0 /* reserved */);
     }
-    return success;
 }
 
-long wxTreeCtrl::HitTest(const wxPoint& point, int& flags)
-{
-    TV_HITTESTINFO hitTestInfo;
-  hitTestInfo.pt.x = (int) point.x;
-  hitTestInfo.pt.y = (int) point.y;
-
-    TreeView_HitTest((HWND) GetHWND(), & hitTestInfo);
-
-  flags = 0;
-  if ( hitTestInfo.flags & TVHT_ABOVE )
-    flags |= wxTREE_HITTEST_ABOVE;
-  if ( hitTestInfo.flags & TVHT_BELOW )
-    flags |= wxTREE_HITTEST_BELOW;
-  if ( hitTestInfo.flags & TVHT_NOWHERE )
-    flags |= wxTREE_HITTEST_NOWHERE;
-  if ( hitTestInfo.flags & TVHT_ONITEMBUTTON )
-    flags |= wxTREE_HITTEST_ONITEMBUTTON;
-  if ( hitTestInfo.flags & TVHT_ONITEMICON )
-    flags |= wxTREE_HITTEST_ONITEMICON;
-  if ( hitTestInfo.flags & TVHT_ONITEMINDENT )
-    flags |= wxTREE_HITTEST_ONITEMINDENT;
-  if ( hitTestInfo.flags & TVHT_ONITEMLABEL )
-    flags |= wxTREE_HITTEST_ONITEMLABEL;
-  if ( hitTestInfo.flags & TVHT_ONITEMRIGHT )
-    flags |= wxTREE_HITTEST_ONITEMRIGHT;
-  if ( hitTestInfo.flags & TVHT_ONITEMSTATEICON )
-    flags |= wxTREE_HITTEST_ONITEMSTATEICON;
-  if ( hitTestInfo.flags & TVHT_TOLEFT )
-    flags |= wxTREE_HITTEST_TOLEFT;
-  if ( hitTestInfo.flags & TVHT_TORIGHT )
-    flags |= wxTREE_HITTEST_TORIGHT;
-
-  return (long) hitTestInfo.hItem ;
-}
+// ----------------------------------------------------------------------------
+// implementation
+// ----------------------------------------------------------------------------
 
-/*
-wxImageList *wxTreeCtrl::CreateDragImage(long item)
+bool wxTreeCtrl::MSWShouldPreProcessMessage(WXMSG* msg)
 {
+    if ( msg->message == WM_KEYDOWN )
+    {
+        // Only eat VK_RETURN if not being used by the application in
+        // conjunction with modifiers
+        if ( (msg->wParam == VK_RETURN) && !wxIsAnyModifierDown() )
+        {
+            // we need VK_RETURN to generate wxEVT_COMMAND_TREE_ITEM_ACTIVATED
+            return false;
+        }
+    }
+
+    return wxTreeCtrlBase::MSWShouldPreProcessMessage(msg);
 }
-*/
 
-bool wxTreeCtrl::SortChildren(long item)
+bool wxTreeCtrl::MSWCommand(WXUINT cmd, WXWORD id_)
 {
-  return (TreeView_SortChildren((HWND) GetHWND(), (HTREEITEM) item, 0) != 0);
+    const int id = (signed short)id_;
+
+    if ( cmd == EN_UPDATE )
+    {
+        wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, id);
+        event.SetEventObject( this );
+        ProcessCommand(event);
+    }
+    else if ( cmd == EN_KILLFOCUS )
+    {
+        wxCommandEvent event(wxEVT_KILL_FOCUS, id);
+        event.SetEventObject( this );
+        ProcessCommand(event);
+    }
+    else
+    {
+        // nothing done
+        return false;
+    }
+
+    // command processed
+    return true;
 }
 
-bool wxTreeCtrl::EnsureVisible(long item)
+bool wxTreeCtrl::MSWIsOnItem(unsigned flags) const
 {
-  return (TreeView_EnsureVisible((HWND) GetHWND(), (HTREEITEM) item) != 0);
+    unsigned mask = TVHT_ONITEM;
+    if ( HasFlag(wxTR_FULL_ROW_HIGHLIGHT) )
+        mask |= TVHT_ONITEMINDENT | TVHT_ONITEMRIGHT;
+
+    return (flags & mask) != 0;
 }
 
-bool wxTreeCtrl::MSWCommand(WXUINT cmd, WXWORD id)
+bool wxTreeCtrl::MSWHandleSelectionKey(unsigned vkey)
 {
-  if (cmd == EN_UPDATE)
-  {
-    wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, id);
-    event.SetEventObject( this );
-    ProcessCommand(event);
-    return TRUE;
-  }
-  else if (cmd == EN_KILLFOCUS)
-  {
-    wxCommandEvent event(wxEVT_KILL_FOCUS, id);
-    event.SetEventObject( this );
-    ProcessCommand(event);
-    return TRUE;
-  }
-  else return FALSE;
+    const bool bCtrl = wxIsCtrlDown();
+    const bool bShift = wxIsShiftDown();
+    const HTREEITEM htSel = (HTREEITEM)TreeView_GetSelection(GetHwnd());
+
+    switch ( vkey )
+    {
+        case VK_RETURN:
+        case VK_SPACE:
+            if ( !htSel )
+                break;
+
+            if ( vkey != VK_RETURN && bCtrl )
+            {
+                wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                          this, htSel);
+                changingEvent.m_itemOld = htSel;
+
+                if ( IsTreeEventAllowed(changingEvent) )
+                {
+                    DoToggleItemSelection(wxTreeItemId(htSel));
+
+                    wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                             this, htSel);
+                    changedEvent.m_itemOld = htSel;
+                    (void)HandleTreeEvent(changedEvent);
+                }
+            }
+            else
+            {
+                wxArrayTreeItemIds selections;
+                size_t count = GetSelections(selections);
+
+                if ( count != 1 || HITEM(selections[0]) != htSel )
+                {
+                    wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                              this, htSel);
+                    changingEvent.m_itemOld = htSel;
+
+                    if ( IsTreeEventAllowed(changingEvent) )
+                    {
+                        DoUnselectAll();
+                        DoSelectItem(wxTreeItemId(htSel));
+
+                        wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                 this, htSel);
+                        changedEvent.m_itemOld = htSel;
+                        (void)HandleTreeEvent(changedEvent);
+                    }
+                }
+            }
+            break;
+
+        case VK_UP:
+        case VK_DOWN:
+            if ( !bCtrl && !bShift )
+            {
+                wxArrayTreeItemIds selections;
+                wxTreeItemId next;
+
+                if ( htSel )
+                {
+                    next = vkey == VK_UP
+                            ? TreeView_GetPrevVisible(GetHwnd(), htSel)
+                            : TreeView_GetNextVisible(GetHwnd(), htSel);
+                }
+                else
+                {
+                    next = GetRootItem();
+
+                    if ( IsHiddenRoot(next) )
+                        next = TreeView_GetChild(GetHwnd(), HITEM(next));
+                }
+
+                if ( !next.IsOk() )
+                {
+                    break;
+                }
+
+                wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                          this, next);
+                changingEvent.m_itemOld = htSel;
+
+                if ( IsTreeEventAllowed(changingEvent) )
+                {
+                    DoUnselectAll();
+                    DoSelectItem(next);
+                    SetFocusedItem(next);
+
+                    wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                             this, next);
+                    changedEvent.m_itemOld = htSel;
+                    (void)HandleTreeEvent(changedEvent);
+                }
+            }
+            else if ( htSel )
+            {
+                wxTreeItemId next = vkey == VK_UP
+                    ? TreeView_GetPrevVisible(GetHwnd(), htSel)
+                    : TreeView_GetNextVisible(GetHwnd(), htSel);
+
+                if ( !next.IsOk() )
+                {
+                    break;
+                }
+
+                if ( !m_htSelStart )
+                {
+                    m_htSelStart = htSel;
+                }
+
+                if ( bShift && SelectRange(GetHwnd(), HITEM(m_htSelStart), HITEM(next),
+                     SR_UNSELECT_OTHERS | SR_SIMULATE) )
+                {
+                    wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING, this, next);
+                    changingEvent.m_itemOld = htSel;
+
+                    if ( IsTreeEventAllowed(changingEvent) )
+                    {
+                        SelectRange(GetHwnd(), HITEM(m_htSelStart), HITEM(next),
+                                    SR_UNSELECT_OTHERS);
+
+                        wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED, this, next);
+                        changedEvent.m_itemOld = htSel;
+                        (void)HandleTreeEvent(changedEvent);
+                    }
+                }
+
+                SetFocusedItem(next);
+            }
+            break;
+
+        case VK_LEFT:
+            if ( HasChildren(htSel) && IsExpanded(htSel) )
+            {
+                Collapse(htSel);
+            }
+            else
+            {
+                wxTreeItemId next = GetItemParent(htSel);
+
+                if ( next.IsOk() && !IsHiddenRoot(next) )
+                {
+                    wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                              this, next);
+                    changingEvent.m_itemOld = htSel;
+
+                    if ( IsTreeEventAllowed(changingEvent) )
+                    {
+                        DoUnselectAll();
+                        DoSelectItem(next);
+                        SetFocusedItem(next);
+
+                        wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                 this, next);
+                        changedEvent.m_itemOld = htSel;
+                        (void)HandleTreeEvent(changedEvent);
+                    }
+                }
+            }
+            break;
+
+        case VK_RIGHT:
+            if ( !IsVisible(htSel) )
+            {
+                EnsureVisible(htSel);
+            }
+
+            if ( !HasChildren(htSel) )
+                break;
+
+            if ( !IsExpanded(htSel) )
+            {
+                Expand(htSel);
+            }
+            else
+            {
+                wxTreeItemId next = TreeView_GetChild(GetHwnd(), htSel);
+
+                wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING, this, next);
+                changingEvent.m_itemOld = htSel;
+
+                if ( IsTreeEventAllowed(changingEvent) )
+                {
+                    DoUnselectAll();
+                    DoSelectItem(next);
+                    SetFocusedItem(next);
+
+                    wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED, this, next);
+                    changedEvent.m_itemOld = htSel;
+                    (void)HandleTreeEvent(changedEvent);
+                }
+            }
+            break;
+
+        case VK_HOME:
+        case VK_END:
+            {
+                wxTreeItemId next = GetRootItem();
+
+                if ( IsHiddenRoot(next) )
+                {
+                    next = TreeView_GetChild(GetHwnd(), HITEM(next));
+                }
+
+                if ( !next.IsOk() )
+                    break;
+
+                if ( vkey == VK_END )
+                {
+                    for ( ;; )
+                    {
+                        wxTreeItemId nextTemp = TreeView_GetNextVisible(
+                                                    GetHwnd(), HITEM(next));
+
+                        if ( !nextTemp.IsOk() )
+                            break;
+
+                        next = nextTemp;
+                    }
+                }
+
+                if ( htSel == HITEM(next) )
+                    break;
+
+                if ( bShift )
+                {
+                    if ( !m_htSelStart )
+                    {
+                        m_htSelStart = htSel;
+                    }
+
+                    if ( SelectRange(GetHwnd(),
+                                     HITEM(m_htSelStart), HITEM(next),
+                                     SR_UNSELECT_OTHERS | SR_SIMULATE) )
+                    {
+                        wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                                  this, next);
+                        changingEvent.m_itemOld = htSel;
+
+                        if ( IsTreeEventAllowed(changingEvent) )
+                        {
+                            SelectRange(GetHwnd(),
+                                        HITEM(m_htSelStart), HITEM(next),
+                                        SR_UNSELECT_OTHERS);
+                            SetFocusedItem(next);
+
+                            wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                     this, next);
+                            changedEvent.m_itemOld = htSel;
+                            (void)HandleTreeEvent(changedEvent);
+                        }
+                    }
+                }
+                else // no Shift
+                {
+                    wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                              this, next);
+                    changingEvent.m_itemOld = htSel;
+
+                    if ( IsTreeEventAllowed(changingEvent) )
+                    {
+                        DoUnselectAll();
+                        DoSelectItem(next);
+                        SetFocusedItem(next);
+
+                        wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                 this, next);
+                        changedEvent.m_itemOld = htSel;
+                        (void)HandleTreeEvent(changedEvent);
+                    }
+                }
+            }
+            break;
+
+        case VK_PRIOR:
+        case VK_NEXT:
+            if ( bCtrl )
+            {
+                wxTreeItemId firstVisible = GetFirstVisibleItem();
+                size_t visibleCount = TreeView_GetVisibleCount(GetHwnd());
+                wxTreeItemId nextAdjacent = (vkey == VK_PRIOR) ?
+                    TreeView_GetPrevVisible(GetHwnd(), HITEM(firstVisible)) :
+                    TreeView_GetNextVisible(GetHwnd(), HITEM(firstVisible));
+
+                if ( !nextAdjacent )
+                {
+                    break;
+                }
+
+                wxTreeItemId nextStart = firstVisible;
+
+                for ( size_t n = 1; n < visibleCount; n++ )
+                {
+                    wxTreeItemId nextTemp = (vkey == VK_PRIOR) ?
+                        TreeView_GetPrevVisible(GetHwnd(), HITEM(nextStart)) :
+                        TreeView_GetNextVisible(GetHwnd(), HITEM(nextStart));
+
+                    if ( nextTemp.IsOk() )
+                    {
+                        nextStart = nextTemp;
+                    }
+                    else
+                    {
+                        break;
+                    }
+                }
+
+                EnsureVisible(nextStart);
+
+                if ( vkey == VK_NEXT )
+                {
+                    wxTreeItemId nextEnd = nextStart;
+
+                    for ( size_t n = 1; n < visibleCount; n++ )
+                    {
+                        wxTreeItemId nextTemp =
+                            TreeView_GetNextVisible(GetHwnd(), HITEM(nextEnd));
+
+                        if ( nextTemp.IsOk() )
+                        {
+                            nextEnd = nextTemp;
+                        }
+                        else
+                        {
+                            break;
+                        }
+                    }
+
+                    EnsureVisible(nextEnd);
+                }
+            }
+            else // no Ctrl
+            {
+                size_t visibleCount = TreeView_GetVisibleCount(GetHwnd());
+                wxTreeItemId nextAdjacent = (vkey == VK_PRIOR) ?
+                    TreeView_GetPrevVisible(GetHwnd(), htSel) :
+                    TreeView_GetNextVisible(GetHwnd(), htSel);
+
+                if ( !nextAdjacent )
+                {
+                    break;
+                }
+
+                wxTreeItemId next(htSel);
+
+                for ( size_t n = 1; n < visibleCount; n++ )
+                {
+                    wxTreeItemId nextTemp = vkey == VK_PRIOR ?
+                        TreeView_GetPrevVisible(GetHwnd(), HITEM(next)) :
+                        TreeView_GetNextVisible(GetHwnd(), HITEM(next));
+
+                    if ( !nextTemp.IsOk() )
+                        break;
+
+                    next = nextTemp;
+                }
+
+                wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                          this, next);
+                changingEvent.m_itemOld = htSel;
+
+                if ( IsTreeEventAllowed(changingEvent) )
+                {
+                    DoUnselectAll();
+                    m_htSelStart.Unset();
+                    DoSelectItem(next);
+                    SetFocusedItem(next);
+
+                    wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                             this, next);
+                    changedEvent.m_itemOld = htSel;
+                    (void)HandleTreeEvent(changedEvent);
+                }
+            }
+            break;
+
+        default:
+            return false;
+    }
+
+    return true;
 }
 
-bool wxTreeCtrl::MSWNotify(WXWPARAM wParam, WXLPARAM lParam)
+bool wxTreeCtrl::MSWHandleTreeKeyDownEvent(WXWPARAM wParam, WXLPARAM lParam)
 {
-  wxTreeEvent event(wxEVT_NULL, m_windowId);
-  wxEventType eventType = wxEVT_NULL;
-  NMHDR* hdr1 = (NMHDR*) lParam;
-  switch ( hdr1->code )
-  {
-    case TVN_BEGINDRAG:
+    wxTreeEvent keyEvent(wxEVT_COMMAND_TREE_KEY_DOWN, this);
+    keyEvent.m_evtKey = CreateKeyEvent(wxEVT_KEY_DOWN, wParam, lParam);
+
+    bool processed = HandleTreeEvent(keyEvent);
+
+    // generate a separate event for Space/Return
+    if ( !wxIsCtrlDown() && !wxIsShiftDown() && !wxIsAltDown() &&
+         ((wParam == VK_SPACE) || (wParam == VK_RETURN)) )
     {
-      eventType = wxEVT_COMMAND_TREE_BEGIN_DRAG;
-      NM_TREEVIEW* hdr = (NM_TREEVIEW*)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, hdr->itemNew, (HWND) GetHWND());
-      event.m_pointDrag.x = hdr->ptDrag.x;
-      event.m_pointDrag.y = hdr->ptDrag.y;
-      break;
+        const HTREEITEM htSel = (HTREEITEM)TreeView_GetSelection(GetHwnd());
+        if ( htSel )
+        {
+            wxTreeEvent activatedEvent(wxEVT_COMMAND_TREE_ITEM_ACTIVATED,
+                                       this, htSel);
+            (void)HandleTreeEvent(activatedEvent);
+        }
     }
-    case TVN_BEGINLABELEDIT:
+
+    return processed;
+}
+
+// we hook into WndProc to process WM_MOUSEMOVE/WM_BUTTONUP messages - as we
+// only do it during dragging, minimize wxWin overhead (this is important for
+// WM_MOUSEMOVE as they're a lot of them) by catching Windows messages directly
+// instead of passing by wxWin events
+WXLRESULT
+wxTreeCtrl::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
+{
+    bool processed = false;
+    WXLRESULT rc = 0;
+    bool isMultiple = HasFlag(wxTR_MULTIPLE);
+
+    if ( nMsg == WM_CONTEXTMENU )
     {
-      eventType = wxEVT_COMMAND_TREE_BEGIN_LABEL_EDIT;
-      TV_DISPINFO *info = (TV_DISPINFO *)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, info->item, (HWND) GetHWND());
-      break;
+        int x = GET_X_LPARAM(lParam),
+            y = GET_Y_LPARAM(lParam);
+
+        // the item for which the menu should be shown
+        wxTreeItemId item;
+
+        // the position where the menu should be shown in client coordinates
+        // (so that it can be passed directly to PopupMenu())
+        wxPoint pt;
+
+        if ( x == -1 || y == -1 )
+        {
+            // this means that the event was generated from keyboard (e.g. with
+            // Shift-F10 or special Windows menu key)
+            //
+            // use the Explorer standard of putting the menu at the left edge
+            // of the text, in the vertical middle of the text
+            item = wxTreeItemId(TreeView_GetSelection(GetHwnd()));
+            if ( item.IsOk() )
+            {
+                // Use the bounding rectangle of only the text part
+                wxRect rect;
+                GetBoundingRect(item, rect, true);
+                pt = wxPoint(rect.GetX(), rect.GetY() + rect.GetHeight() / 2);
+            }
+        }
+        else // event from mouse, use mouse position
+        {
+            pt = ScreenToClient(wxPoint(x, y));
+
+            TV_HITTESTINFO tvhti;
+            tvhti.pt.x = pt.x;
+            tvhti.pt.y = pt.y;
+
+            if ( TreeView_HitTest(GetHwnd(), &tvhti) )
+                item = wxTreeItemId(tvhti.hItem);
+        }
+
+        // create the event
+        if ( item.IsOk() )
+        {
+            wxTreeEvent event(wxEVT_COMMAND_TREE_ITEM_MENU, this, item);
+
+            event.m_pointDrag = pt;
+
+            if ( HandleTreeEvent(event) )
+                processed = true;
+            //else: continue with generating wxEVT_CONTEXT_MENU in base class code
+        }
     }
-    case TVN_BEGINRDRAG:
+    else if ( (nMsg >= WM_MOUSEFIRST) && (nMsg <= WM_MOUSELAST) )
     {
-      eventType = wxEVT_COMMAND_TREE_BEGIN_RDRAG;
-      NM_TREEVIEW* hdr = (NM_TREEVIEW*)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, hdr->itemNew, (HWND) GetHWND());
-      event.m_pointDrag.x = hdr->ptDrag.x;
-      event.m_pointDrag.y = hdr->ptDrag.y;
-      break;
+        // we only process mouse messages here and these parameters have the
+        // same meaning for all of them
+        int x = GET_X_LPARAM(lParam),
+            y = GET_Y_LPARAM(lParam);
+
+        TV_HITTESTINFO tvht;
+        tvht.pt.x = x;
+        tvht.pt.y = y;
+
+        HTREEITEM htOldItem = TreeView_GetSelection(GetHwnd());
+        HTREEITEM htItem = TreeView_HitTest(GetHwnd(), &tvht);
+
+        switch ( nMsg )
+        {
+            case WM_LBUTTONDOWN:
+                if ( !isMultiple )
+                    break;
+
+                m_htClickedItem.Unset();
+
+                if ( !MSWIsOnItem(tvht.flags) )
+                {
+                    if ( tvht.flags & TVHT_ONITEMBUTTON )
+                    {
+                        // either it's going to be handled by user code or
+                        // we're going to use it ourselves to toggle the
+                        // branch, in either case don't pass it to the base
+                        // class which would generate another mouse click event
+                        // for it even though it's already handled here
+                        processed = true;
+                        SetFocus();
+
+                        if ( !HandleMouseEvent(nMsg, x, y, wParam) )
+                        {
+                            if ( !IsExpanded(htItem) )
+                            {
+                                Expand(htItem);
+                            }
+                            else
+                            {
+                                Collapse(htItem);
+                            }
+                        }
+                    }
+
+                    m_focusLost = false;
+                    break;
+                }
+
+                processed = true;
+                SetFocus();
+                m_htClickedItem = (WXHTREEITEM) htItem;
+                m_ptClick = wxPoint(x, y);
+
+                if ( wParam & MK_CONTROL )
+                {
+                    if ( HandleMouseEvent(nMsg, x, y, wParam) )
+                    {
+                        m_htClickedItem.Unset();
+                        break;
+                    }
+
+                    wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                              this, htItem);
+                    changingEvent.m_itemOld = htOldItem;
+
+                    if ( IsTreeEventAllowed(changingEvent) )
+                    {
+                        // toggle selected state
+                        DoToggleItemSelection(wxTreeItemId(htItem));
+
+                        SetFocusedItem(wxTreeItemId(htItem));
+
+                        // reset on any click without Shift
+                        m_htSelStart.Unset();
+
+                        wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                 this, htItem);
+                        changedEvent.m_itemOld = htOldItem;
+                        (void)HandleTreeEvent(changedEvent);
+                    }
+                }
+                else if ( wParam & MK_SHIFT )
+                {
+                    if ( HandleMouseEvent(nMsg, x, y, wParam) )
+                    {
+                        m_htClickedItem.Unset();
+                        break;
+                    }
+
+                    int srFlags = 0;
+                    bool willChange = true;
+
+                    if ( !(wParam & MK_CONTROL) )
+                    {
+                        srFlags |= SR_UNSELECT_OTHERS;
+                    }
+
+                    if ( !m_htSelStart )
+                    {
+                        // take the focused item
+                        m_htSelStart = htOldItem;
+                    }
+                    else
+                    {
+                        willChange = SelectRange(GetHwnd(), HITEM(m_htSelStart),
+                                                 htItem, srFlags | SR_SIMULATE);
+                    }
+
+                    if ( willChange )
+                    {
+                        wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                                  this, htItem);
+                        changingEvent.m_itemOld = htOldItem;
+
+                        if ( IsTreeEventAllowed(changingEvent) )
+                        {
+                            // this selects all items between the starting one
+                            // and the current
+                            if ( m_htSelStart )
+                            {
+                                SelectRange(GetHwnd(), HITEM(m_htSelStart),
+                                            htItem, srFlags);
+                            }
+                            else
+                            {
+                                DoSelectItem(wxTreeItemId(htItem));
+                            }
+
+                            SetFocusedItem(wxTreeItemId(htItem));
+
+                            wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                     this, htItem);
+                            changedEvent.m_itemOld = htOldItem;
+                            (void)HandleTreeEvent(changedEvent);
+                        }
+                    }
+                }
+                else // normal click
+                {
+                    // avoid doing anything if we click on the only
+                    // currently selected item
+
+                    wxArrayTreeItemIds selections;
+                    size_t count = GetSelections(selections);
+
+                    if ( count == 0 ||
+                         count > 1 ||
+                         HITEM(selections[0]) != htItem )
+                    {
+                        if ( HandleMouseEvent(nMsg, x, y, wParam) )
+                        {
+                            m_htClickedItem.Unset();
+                            break;
+                        }
+
+                        // clear the previously selected items, if the user
+                        // clicked outside of the present selection, otherwise,
+                        // perform the deselection on mouse-up, this allows
+                        // multiple drag and drop to work.
+                        if ( !IsItemSelected(GetHwnd(), htItem))
+                        {
+                            wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                                      this, htItem);
+                            changingEvent.m_itemOld = htOldItem;
+
+                            if ( IsTreeEventAllowed(changingEvent) )
+                            {
+                                DoUnselectAll();
+                                DoSelectItem(wxTreeItemId(htItem));
+                                SetFocusedItem(wxTreeItemId(htItem));
+
+                                wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                         this, htItem);
+                                changedEvent.m_itemOld = htOldItem;
+                                (void)HandleTreeEvent(changedEvent);
+                            }
+                        }
+                        else
+                        {
+                            SetFocusedItem(wxTreeItemId(htItem));
+                            m_mouseUpDeselect = true;
+                        }
+                    }
+                    else // click on a single selected item
+                    {
+                        // don't interfere with the default processing in
+                        // WM_MOUSEMOVE handler below as the default window
+                        // proc will start the drag itself if we let have
+                        // WM_LBUTTONDOWN
+                        m_htClickedItem.Unset();
+
+                        // prevent in-place editing from starting if focus lost
+                        // since previous click
+                        if ( m_focusLost )
+                        {
+                            ClearFocusedItem();
+                            DoSelectItem(wxTreeItemId(htItem));
+                            SetFocusedItem(wxTreeItemId(htItem));
+                        }
+                        else
+                        {
+                            processed = false;
+                        }
+                    }
+
+                    // reset on any click without Shift
+                    m_htSelStart.Unset();
+                }
+
+                m_focusLost = false;
+
+                // we consumed the event so we need to trigger state image
+                // click if needed
+                if ( processed )
+                {
+                    if ( tvht.flags & TVHT_ONITEMSTATEICON )
+                    {
+                        m_triggerStateImageClick = true;
+                    }
+                }
+                break;
+
+            case WM_RBUTTONDOWN:
+                if ( !isMultiple )
+                    break;
+
+                processed = true;
+                SetFocus();
+
+                if ( HandleMouseEvent(nMsg, x, y, wParam) || !htItem )
+                {
+                    break;
+                }
+
+                // default handler removes the highlight from the currently
+                // focused item when right mouse button is pressed on another
+                // one but keeps the remaining items highlighted, which is
+                // confusing, so override this default behaviour
+                if ( !IsItemSelected(GetHwnd(), htItem) )
+                {
+                    wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                              this, htItem);
+                    changingEvent.m_itemOld = htOldItem;
+
+                    if ( IsTreeEventAllowed(changingEvent) )
+                    {
+                        DoUnselectAll();
+                        DoSelectItem(wxTreeItemId(htItem));
+                        SetFocusedItem(wxTreeItemId(htItem));
+
+                        wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                 this, htItem);
+                        changedEvent.m_itemOld = htOldItem;
+                        (void)HandleTreeEvent(changedEvent);
+                    }
+                }
+
+                break;
+
+            case WM_MOUSEMOVE:
+#ifndef __WXWINCE__
+                if ( m_htClickedItem )
+                {
+                    int cx = abs(m_ptClick.x - x);
+                    int cy = abs(m_ptClick.y - y);
+
+                    if ( cx > ::GetSystemMetrics(SM_CXDRAG) ||
+                            cy > ::GetSystemMetrics(SM_CYDRAG) )
+                    {
+                        NM_TREEVIEW tv;
+                        wxZeroMemory(tv);
+
+                        tv.hdr.hwndFrom = GetHwnd();
+                        tv.hdr.idFrom = ::GetWindowLong(GetHwnd(), GWL_ID);
+                        tv.hdr.code = TVN_BEGINDRAG;
+
+                        tv.itemNew.hItem = HITEM(m_htClickedItem);
+
+
+                        TVITEM tviAux;
+                        wxZeroMemory(tviAux);
+
+                        tviAux.hItem = HITEM(m_htClickedItem);
+                        tviAux.mask = TVIF_STATE | TVIF_PARAM;
+                        tviAux.stateMask = 0xffffffff;
+                        TreeView_GetItem(GetHwnd(), &tviAux);
+
+                        tv.itemNew.state = tviAux.state;
+                        tv.itemNew.lParam = tviAux.lParam;
+
+                        tv.ptDrag.x = x;
+                        tv.ptDrag.y = y;
+
+                        // do it before SendMessage() call below to avoid
+                        // reentrancies here if there is another WM_MOUSEMOVE
+                        // in the queue already
+                        m_htClickedItem.Unset();
+
+                        ::SendMessage(GetHwndOf(GetParent()), WM_NOTIFY,
+                                      tv.hdr.idFrom, (LPARAM)&tv );
+
+                        // don't pass it to the default window proc, it would
+                        // start dragging again
+                        processed = true;
+                    }
+                }
+#endif // __WXWINCE__
+
+#if wxUSE_DRAGIMAGE
+                if ( m_dragImage )
+                {
+                    m_dragImage->Move(wxPoint(x, y));
+                    if ( htItem )
+                    {
+                        // highlight the item as target (hiding drag image is
+                        // necessary - otherwise the display will be corrupted)
+                        m_dragImage->Hide();
+                        TreeView_SelectDropTarget(GetHwnd(), htItem);
+                        m_dragImage->Show();
+                    }
+                }
+#endif // wxUSE_DRAGIMAGE
+                break;
+
+            case WM_LBUTTONUP:
+                if ( isMultiple )
+                {
+                    // deselect other items if needed
+                    if ( htItem )
+                    {
+                        if ( m_mouseUpDeselect )
+                        {
+                            m_mouseUpDeselect = false;
+
+                            wxTreeEvent changingEvent(wxEVT_COMMAND_TREE_SEL_CHANGING,
+                                                      this, htItem);
+                            changingEvent.m_itemOld = htOldItem;
+
+                            if ( IsTreeEventAllowed(changingEvent) )
+                            {
+                                DoUnselectAll();
+                                DoSelectItem(wxTreeItemId(htItem));
+                                SetFocusedItem(wxTreeItemId(htItem));
+
+                                wxTreeEvent changedEvent(wxEVT_COMMAND_TREE_SEL_CHANGED,
+                                                         this, htItem);
+                                changedEvent.m_itemOld = htOldItem;
+                                (void)HandleTreeEvent(changedEvent);
+                            }
+                        }
+                    }
+
+                    m_htClickedItem.Unset();
+
+                    if ( m_triggerStateImageClick )
+                    {
+                        if ( tvht.flags & TVHT_ONITEMSTATEICON )
+                        {
+                            wxTreeEvent event(wxEVT_COMMAND_TREE_STATE_IMAGE_CLICK,
+                                              this, htItem);
+                            (void)HandleTreeEvent(event);
+
+                            m_triggerStateImageClick = false;
+                            processed = true;
+                        }
+                    }
+
+                    if ( !m_dragStarted && MSWIsOnItem(tvht.flags) )
+                    {
+                        processed = true;
+                    }
+                }
+
+                // fall through
+
+            case WM_RBUTTONUP:
+#if wxUSE_DRAGIMAGE
+                if ( m_dragImage )
+                {
+                    m_dragImage->EndDrag();
+                    wxDELETE(m_dragImage);
+
+                    // generate the drag end event
+                    wxTreeEvent event(wxEVT_COMMAND_TREE_END_DRAG,
+                                      this, htItem);
+                    event.m_pointDrag = wxPoint(x, y);
+                    (void)HandleTreeEvent(event);
+
+                    // if we don't do it, the tree seems to think that 2 items
+                    // are selected simultaneously which is quite weird
+                    TreeView_SelectDropTarget(GetHwnd(), 0);
+                }
+#endif // wxUSE_DRAGIMAGE
+
+                if ( isMultiple && nMsg == WM_RBUTTONUP )
+                {
+                    // send NM_RCLICK
+                    NMHDR nmhdr;
+                    nmhdr.hwndFrom = GetHwnd();
+                    nmhdr.idFrom = ::GetWindowLong(GetHwnd(), GWL_ID);
+                    nmhdr.code = NM_RCLICK;
+                    ::SendMessage(::GetParent(GetHwnd()), WM_NOTIFY,
+                                  nmhdr.idFrom, (LPARAM)&nmhdr);
+                    processed = true;
+                }
+
+                m_dragStarted = false;
+
+                break;
+        }
     }
-    case TVN_DELETEITEM:
+    else if ( (nMsg == WM_SETFOCUS || nMsg == WM_KILLFOCUS) )
     {
-      eventType = wxEVT_COMMAND_TREE_DELETE_ITEM;
-      NM_TREEVIEW* hdr = (NM_TREEVIEW*)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, hdr->itemOld, (HWND) GetHWND());
-      event.m_pointDrag.x = hdr->ptDrag.x;
-      event.m_pointDrag.y = hdr->ptDrag.y;
-      break;
+        if ( isMultiple )
+        {
+            // the tree control greys out the selected item when it loses focus
+            // and paints it as selected again when it regains it, but it won't
+            // do it for the other items itself - help it
+            wxArrayTreeItemIds selections;
+            size_t count = GetSelections(selections);
+            TVGetItemRectParam param;
+
+            for ( size_t n = 0; n < count; n++ )
+            {
+                // TreeView_GetItemRect() will return false if item is not
+                // visible, which may happen perfectly well
+                if ( wxTreeView_GetItemRect(GetHwnd(), HITEM(selections[n]),
+                                            param, TRUE) )
+                {
+                    ::InvalidateRect(GetHwnd(), &param.rect, FALSE);
+                }
+            }
+        }
+
+        if ( nMsg == WM_KILLFOCUS )
+        {
+            m_focusLost = true;
+        }
     }
-    case TVN_ENDLABELEDIT:
+    else if ( (nMsg == WM_KEYDOWN || nMsg == WM_SYSKEYDOWN) && isMultiple )
     {
-      eventType = wxEVT_COMMAND_TREE_END_LABEL_EDIT;
-      TV_DISPINFO *info = (TV_DISPINFO *)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, info->item, (HWND) GetHWND());
-      break;
+        // normally we want to generate wxEVT_KEY_DOWN events from TVN_KEYDOWN
+        // notification but for the keys which can be used to change selection
+        // we need to do it from here so as to not apply the default behaviour
+        // if the events are handled by the user code
+        switch ( wParam )
+        {
+            case VK_RETURN:
+            case VK_SPACE:
+            case VK_UP:
+            case VK_DOWN:
+            case VK_LEFT:
+            case VK_RIGHT:
+            case VK_HOME:
+            case VK_END:
+            case VK_PRIOR:
+            case VK_NEXT:
+                if ( !HandleKeyDown(wParam, lParam) &&
+                        !MSWHandleTreeKeyDownEvent(wParam, lParam) )
+                {
+                    // use the key to update the selection if it was left
+                    // unprocessed
+                    MSWHandleSelectionKey(wParam);
+                }
+
+                // pretend that we did process it in any case as we already
+                // generated an event for it
+                processed = true;
+
+            //default: for all the other keys leave processed as false so that
+            //         the tree control generates a TVN_KEYDOWN for us
+        }
+
     }
-    case TVN_GETDISPINFO:
+    else if ( nMsg == WM_COMMAND )
     {
-      eventType = wxEVT_COMMAND_TREE_GET_INFO;
-      TV_DISPINFO *info = (TV_DISPINFO *)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, info->item, (HWND) GetHWND());
-      break;
+        // if we receive a EN_KILLFOCUS command from the in-place edit control
+        // used for label editing, make sure to end editing
+        WORD id, cmd;
+        WXHWND hwnd;
+        UnpackCommand(wParam, lParam, &id, &hwnd, &cmd);
+
+        if ( cmd == EN_KILLFOCUS )
+        {
+            if ( m_textCtrl && m_textCtrl->GetHandle() == hwnd )
+            {
+                DoEndEditLabel();
+
+                processed = true;
+            }
+        }
     }
-    case TVN_ITEMEXPANDING:
-    {
-      NM_TREEVIEW* hdr = (NM_TREEVIEW*)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, hdr->itemNew, (HWND) GetHWND());
-
-      switch ( hdr->action )
-      {
-        case TVE_EXPAND:
-          eventType = wxEVT_COMMAND_TREE_ITEM_EXPANDING;
-          break;
 
-        case TVE_COLLAPSE:
-          eventType = wxEVT_COMMAND_TREE_ITEM_COLLAPSING;
-          break;
+    if ( !processed )
+        rc = wxControl::MSWWindowProc(nMsg, wParam, lParam);
 
-        case TVE_COLLAPSERESET:
-        case TVE_TOGGLE:
-          wxLogDebug("unexpected code in TVN_ITEMEXPANDING message");
-          break;
-      }
-      break;
-    }
+    return rc;
+}
 
-    case TVN_ITEMEXPANDED:
+WXLRESULT
+wxTreeCtrl::MSWDefWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
+{
+    if ( nMsg == WM_CHAR )
     {
-      NM_TREEVIEW* hdr = (NM_TREEVIEW*)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, hdr->itemNew, (HWND) GetHWND());
-      switch ( hdr->action )
-      {
-        case TVE_EXPAND:
-          eventType = wxEVT_COMMAND_TREE_ITEM_EXPANDED;
-          break;
-
-        case TVE_COLLAPSE:
-          eventType = wxEVT_COMMAND_TREE_ITEM_COLLAPSED;
-          break;
-
-        case TVE_COLLAPSERESET:
-        case TVE_TOGGLE:
-          wxLogDebug("unexpected code in TVN_ITEMEXPANDED message");
-          break;
-      }
-      break;
+        // don't let the control process Space and Return keys because it
+        // doesn't do anything useful with them anyhow but always beeps
+        // annoyingly when it receives them and there is no way to turn it off
+        // simply if you just process TREEITEM_ACTIVATED event to which Space
+        // and Enter presses are mapped in your code
+        if ( wParam == VK_SPACE || wParam == VK_RETURN )
+            return 0;
     }
-    case TVN_KEYDOWN:
+#if wxUSE_DRAGIMAGE
+    else if ( nMsg == WM_KEYDOWN )
     {
-      eventType = wxEVT_COMMAND_TREE_KEY_DOWN;
-      TV_KEYDOWN *info = (TV_KEYDOWN *)lParam;
-      event.m_code = wxCharCodeMSWToWX(info->wVKey);
-      break;
+        if ( wParam == VK_ESCAPE )
+        {
+            if ( m_dragImage )
+            {
+                m_dragImage->EndDrag();
+                wxDELETE(m_dragImage);
+
+                // if we don't do it, the tree seems to think that 2 items
+                // are selected simultaneously which is quite weird
+                TreeView_SelectDropTarget(GetHwnd(), 0);
+            }
+        }
     }
-    case TVN_SELCHANGED:
-    {
-      eventType = wxEVT_COMMAND_TREE_SEL_CHANGED;
-      NM_TREEVIEW* hdr = (NM_TREEVIEW*)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, hdr->itemNew, (HWND) GetHWND());
-      event.m_oldItem = (long) hdr->itemNew.hItem;
+#endif // wxUSE_DRAGIMAGE
 
-      break;
-    }
-    case TVN_SELCHANGING:
+    return wxControl::MSWDefWindowProc(nMsg, wParam, lParam);
+}
+
+// process WM_NOTIFY Windows message
+bool wxTreeCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
+{
+    wxTreeEvent event(wxEVT_NULL, this);
+    wxEventType eventType = wxEVT_NULL;
+    NMHDR *hdr = (NMHDR *)lParam;
+
+    switch ( hdr->code )
     {
-      eventType = wxEVT_COMMAND_TREE_SEL_CHANGING;
-      NM_TREEVIEW* hdr = (NM_TREEVIEW*)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, hdr->itemNew, (HWND) GetHWND());
-      event.m_oldItem = (long) hdr->itemNew.hItem;
-      break;
+        case TVN_BEGINDRAG:
+            eventType = wxEVT_COMMAND_TREE_BEGIN_DRAG;
+            // fall through
+
+        case TVN_BEGINRDRAG:
+            {
+                if ( eventType == wxEVT_NULL )
+                    eventType = wxEVT_COMMAND_TREE_BEGIN_RDRAG;
+                //else: left drag, already set above
+
+                NM_TREEVIEW *tv = (NM_TREEVIEW *)lParam;
+
+                event.m_item = tv->itemNew.hItem;
+                event.m_pointDrag = wxPoint(tv->ptDrag.x, tv->ptDrag.y);
+
+                // don't allow dragging by default: the user code must
+                // explicitly say that it wants to allow it to avoid breaking
+                // the old apps
+                event.Veto();
+            }
+            break;
+
+        case TVN_BEGINLABELEDIT:
+            {
+                eventType = wxEVT_COMMAND_TREE_BEGIN_LABEL_EDIT;
+                TV_DISPINFO *info = (TV_DISPINFO *)lParam;
+
+                // although the user event handler may still veto it, it is
+                // important to set it now so that calls to SetItemText() from
+                // the event handler would change the text controls contents
+                m_idEdited =
+                event.m_item = info->item.hItem;
+                event.m_label = info->item.pszText;
+                event.m_editCancelled = false;
+            }
+            break;
+
+        case TVN_DELETEITEM:
+            {
+                eventType = wxEVT_COMMAND_TREE_DELETE_ITEM;
+                NM_TREEVIEW *tv = (NM_TREEVIEW *)lParam;
+
+                event.m_item = tv->itemOld.hItem;
+
+                if ( m_hasAnyAttr )
+                {
+                    wxMapTreeAttr::iterator it = m_attrs.find(tv->itemOld.hItem);
+                    if ( it != m_attrs.end() )
+                    {
+                        delete it->second;
+                        m_attrs.erase(it);
+                    }
+                }
+            }
+            break;
+
+        case TVN_ENDLABELEDIT:
+            {
+                eventType = wxEVT_COMMAND_TREE_END_LABEL_EDIT;
+                TV_DISPINFO *info = (TV_DISPINFO *)lParam;
+
+                event.m_item = info->item.hItem;
+                event.m_label = info->item.pszText;
+                event.m_editCancelled = info->item.pszText == NULL;
+                break;
+            }
+
+#ifndef __WXWINCE__
+        // These *must* not be removed or TVN_GETINFOTIP will
+        // not be processed each time the mouse is moved
+        // and the tooltip will only ever update once.
+        case TTN_NEEDTEXTA:
+        case TTN_NEEDTEXTW:
+            {
+                *result = 0;
+
+                break;
+            }
+
+#ifdef TVN_GETINFOTIP
+        case TVN_GETINFOTIP:
+            {
+                eventType = wxEVT_COMMAND_TREE_ITEM_GETTOOLTIP;
+                NMTVGETINFOTIP *info = (NMTVGETINFOTIP*)lParam;
+
+                // Which item are we trying to get a tooltip for?
+                event.m_item = info->hItem;
+
+                break;
+            }
+#endif // TVN_GETINFOTIP
+#endif // !__WXWINCE__
+
+        case TVN_GETDISPINFO:
+            eventType = wxEVT_COMMAND_TREE_GET_INFO;
+            // fall through
+
+        case TVN_SETDISPINFO:
+            {
+                if ( eventType == wxEVT_NULL )
+                    eventType = wxEVT_COMMAND_TREE_SET_INFO;
+                //else: get, already set above
+
+                TV_DISPINFO *info = (TV_DISPINFO *)lParam;
+
+                event.m_item = info->item.hItem;
+                break;
+            }
+
+        case TVN_ITEMEXPANDING:
+        case TVN_ITEMEXPANDED:
+            {
+                NM_TREEVIEW *tv = (NM_TREEVIEW*)lParam;
+
+                int what;
+                switch ( tv->action )
+                {
+                    default:
+                        wxLogDebug(wxT("unexpected code %d in TVN_ITEMEXPAND message"), tv->action);
+                        // fall through
+
+                    case TVE_EXPAND:
+                        what = IDX_EXPAND;
+                        break;
+
+                    case TVE_COLLAPSE:
+                        what = IDX_COLLAPSE;
+                        break;
+                }
+
+                int how = hdr->code == TVN_ITEMEXPANDING ? IDX_DOING
+                                                         : IDX_DONE;
+
+                eventType = gs_expandEvents[what][how];
+
+                event.m_item = tv->itemNew.hItem;
+            }
+            break;
+
+        case TVN_KEYDOWN:
+            {
+                TV_KEYDOWN *info = (TV_KEYDOWN *)lParam;
+
+                // fabricate the lParam and wParam parameters sufficiently
+                // similar to the ones from a "real" WM_KEYDOWN so that
+                // CreateKeyEvent() works correctly
+                return MSWHandleTreeKeyDownEvent(
+                        info->wVKey, (wxIsAltDown() ? KF_ALTDOWN : 0) << 16);
+            }
+
+
+        // Vista's tree control has introduced some problems with our
+        // multi-selection tree.  When TreeView_SelectItem() is called,
+        // the wrong items are deselected.
+
+        // Fortunately, Vista provides a new notification, TVN_ITEMCHANGING
+        // that can be used to regulate this incorrect behaviour.  The
+        // following messages will allow only the unlocked item's selection
+        // state to change
+
+        case TVN_ITEMCHANGINGA:
+        case TVN_ITEMCHANGINGW:
+            {
+                // we only need to handles these in multi-select trees
+                if ( HasFlag(wxTR_MULTIPLE) )
+                {
+                    // get info about the item about to be changed
+                    NMTVITEMCHANGE* info = (NMTVITEMCHANGE*)lParam;
+                    if (TreeItemUnlocker::IsLocked(info->hItem))
+                    {
+                        // item's state is locked, don't allow the change
+                        // returning 1 will disallow the change
+                        *result = 1;
+                        return true;
+                    }
+                }
+
+                // allow the state change
+            }
+            return false;
+
+        // NB: MSLU is broken and sends TVN_SELCHANGEDA instead of
+        //     TVN_SELCHANGEDW in Unicode mode under Win98. Therefore
+        //     we have to handle both messages:
+        case TVN_SELCHANGEDA:
+        case TVN_SELCHANGEDW:
+            if ( !m_changingSelection )
+            {
+                eventType = wxEVT_COMMAND_TREE_SEL_CHANGED;
+            }
+            // fall through
+
+        case TVN_SELCHANGINGA:
+        case TVN_SELCHANGINGW:
+            if ( !m_changingSelection )
+            {
+                if ( eventType == wxEVT_NULL )
+                    eventType = wxEVT_COMMAND_TREE_SEL_CHANGING;
+                //else: already set above
+
+                if (hdr->code == TVN_SELCHANGINGW ||
+                    hdr->code == TVN_SELCHANGEDW)
+                {
+                    NM_TREEVIEWW *tv = (NM_TREEVIEWW *)lParam;
+                    event.m_item = tv->itemNew.hItem;
+                    event.m_itemOld = tv->itemOld.hItem;
+                }
+                else
+                {
+                    NM_TREEVIEWA *tv = (NM_TREEVIEWA *)lParam;
+                    event.m_item = tv->itemNew.hItem;
+                    event.m_itemOld = tv->itemOld.hItem;
+                }
+            }
+
+            // we receive this message from WM_LBUTTONDOWN handler inside
+            // comctl32.dll and so before the click is passed to
+            // DefWindowProc() which sets the focus to the window which was
+            // clicked and this can lead to unexpected event sequences: for
+            // example, we may get a "selection change" event from the tree
+            // before getting a "kill focus" event for the text control which
+            // had the focus previously, thus breaking user code doing input
+            // validation
+            //
+            // to avoid such surprises, we force the generation of focus events
+            // now, before we generate the selection change ones
+            if ( !m_changingSelection && !m_isBeingDeleted )
+                SetFocus();
+            break;
+
+        // instead of explicitly checking for _WIN32_IE, check if the
+        // required symbols are available in the headers
+#if defined(CDDS_PREPAINT)
+        case NM_CUSTOMDRAW:
+            {
+                LPNMTVCUSTOMDRAW lptvcd = (LPNMTVCUSTOMDRAW)lParam;
+                NMCUSTOMDRAW& nmcd = lptvcd->nmcd;
+                switch ( nmcd.dwDrawStage )
+                {
+                    case CDDS_PREPAINT:
+                        // if we've got any items with non standard attributes,
+                        // notify us before painting each item
+                        *result = m_hasAnyAttr ? CDRF_NOTIFYITEMDRAW
+                                               : CDRF_DODEFAULT;
+
+                        // windows in TreeCtrl use one-based index for item state images,
+                        // 0 indexed image is not being used, we're using zero-based index,
+                        // so we have to add temp image (of zero index) to state image list
+                        // before we draw any item, then after items are drawn we have to
+                        // delete it (in POSTPAINT notify)
+                        if (m_imageListState && m_imageListState->GetImageCount() > 0)
+                        {
+                            typedef BOOL (wxSTDCALL *ImageList_Copy_t)
+                                (HIMAGELIST, int, HIMAGELIST, int, UINT);
+                            static ImageList_Copy_t s_pfnImageList_Copy = NULL;
+                            static bool loaded = false;
+
+                            if ( !loaded )
+                            {
+                                wxLoadedDLL dllComCtl32(wxT("comctl32.dll"));
+                                if ( dllComCtl32.IsLoaded() )
+                                {
+                                    wxDL_INIT_FUNC(s_pfn, ImageList_Copy, dllComCtl32);
+                                    loaded = true;
+                                }
+                            }
+
+                            if ( !s_pfnImageList_Copy )
+                            {
+                                // this code is broken with ImageList_Copy()
+                                // but I don't care enough about Win95 support
+                                // to write it now -- if anybody does, please
+                                // do it
+                                wxFAIL_MSG("TODO: implement this for Win95");
+                                break;
+                            }
+
+                            const HIMAGELIST
+                                hImageList = GetHimagelistOf(m_imageListState);
+
+                            // add temporary image
+                            int width, height;
+                            m_imageListState->GetSize(0, width, height);
+
+                            HBITMAP hbmpTemp = ::CreateBitmap(width, height, 1, 1, NULL);
+                            int index = ::ImageList_Add(hImageList, hbmpTemp, hbmpTemp);
+                            ::DeleteObject(hbmpTemp);
+
+                            if ( index != -1 )
+                            {
+                                // move images to right
+                                for ( int i = index; i > 0; i-- )
+                                {
+                                    (*s_pfnImageList_Copy)(hImageList, i,
+                                                           hImageList, i-1,
+                                                           ILCF_MOVE);
+                                }
+
+                                // we must remove the image in POSTPAINT notify
+                                *result |= CDRF_NOTIFYPOSTPAINT;
+                            }
+                        }
+                        break;
+
+                    case CDDS_POSTPAINT:
+                        // we are deleting temp image of 0 index, which was
+                        // added before items were drawn (in PREPAINT notify)
+                        if (m_imageListState && m_imageListState->GetImageCount() > 0)
+                            m_imageListState->Remove(0);
+                        break;
+
+                    case CDDS_ITEMPREPAINT:
+                        {
+                            wxMapTreeAttr::iterator
+                                it = m_attrs.find((void *)nmcd.dwItemSpec);
+
+                            if ( it == m_attrs.end() )
+                            {
+                                // nothing to do for this item
+                                *result = CDRF_DODEFAULT;
+                                break;
+                            }
+
+                            wxTreeItemAttr * const attr = it->second;
+
+                            wxTreeViewItem tvItem((void *)nmcd.dwItemSpec,
+                                                  TVIF_STATE, TVIS_DROPHILITED);
+                            DoGetItem(&tvItem);
+                            const UINT tvItemState = tvItem.state;
+
+                            // selection colours should override ours,
+                            // otherwise it is too confusing to the user
+                            if ( !(nmcd.uItemState & CDIS_SELECTED) &&
+                                 !(tvItemState & TVIS_DROPHILITED) )
+                            {
+                                wxColour colBack;
+                                if ( attr->HasBackgroundColour() )
+                                {
+                                    colBack = attr->GetBackgroundColour();
+                                    lptvcd->clrTextBk = wxColourToRGB(colBack);
+                                }
+                            }
+
+                            // but we still want to keep the special foreground
+                            // colour when we don't have focus (we can't keep
+                            // it when we do, it would usually be unreadable on
+                            // the almost inverted bg colour...)
+                            if ( ( !(nmcd.uItemState & CDIS_SELECTED) ||
+                                    FindFocus() != this ) &&
+                                 !(tvItemState & TVIS_DROPHILITED) )
+                            {
+                                wxColour colText;
+                                if ( attr->HasTextColour() )
+                                {
+                                    colText = attr->GetTextColour();
+                                    lptvcd->clrText = wxColourToRGB(colText);
+                                }
+                            }
+
+                            if ( attr->HasFont() )
+                            {
+                                HFONT hFont = GetHfontOf(attr->GetFont());
+
+                                ::SelectObject(nmcd.hdc, hFont);
+
+                                *result = CDRF_NEWFONT;
+                            }
+                            else // no specific font
+                            {
+                                *result = CDRF_DODEFAULT;
+                            }
+                        }
+                        break;
+
+                    default:
+                        *result = CDRF_DODEFAULT;
+                }
+            }
+
+            // we always process it
+            return true;
+#endif // have owner drawn support in headers
+
+        case NM_CLICK:
+            {
+                DWORD pos = GetMessagePos();
+                POINT point;
+                point.x = LOWORD(pos);
+                point.y = HIWORD(pos);
+                ::MapWindowPoints(HWND_DESKTOP, GetHwnd(), &point, 1);
+                int htFlags = 0;
+                wxTreeItemId item = HitTest(wxPoint(point.x, point.y), htFlags);
+
+                if ( htFlags & wxTREE_HITTEST_ONITEMSTATEICON )
+                {
+                    event.m_item = item;
+                    eventType = wxEVT_COMMAND_TREE_STATE_IMAGE_CLICK;
+                }
+
+                break;
+            }
+
+        case NM_DBLCLK:
+        case NM_RCLICK:
+            {
+                TV_HITTESTINFO tvhti;
+                wxGetCursorPosMSW(&tvhti.pt);
+                ::ScreenToClient(GetHwnd(), &tvhti.pt);
+                if ( TreeView_HitTest(GetHwnd(), &tvhti) )
+                {
+                    if ( MSWIsOnItem(tvhti.flags) )
+                    {
+                        event.m_item = tvhti.hItem;
+                        eventType = (int)hdr->code == NM_DBLCLK
+                                    ? wxEVT_COMMAND_TREE_ITEM_ACTIVATED
+                                    : wxEVT_COMMAND_TREE_ITEM_RIGHT_CLICK;
+
+                        event.m_pointDrag.x = tvhti.pt.x;
+                        event.m_pointDrag.y = tvhti.pt.y;
+                    }
+
+                    break;
+                }
+            }
+            // fall through
+
+        default:
+            return wxControl::MSWOnNotify(idCtrl, lParam, result);
     }
-    case TVN_SETDISPINFO:
+
+    event.SetEventType(eventType);
+
+    bool processed = HandleTreeEvent(event);
+
+    // post processing
+    switch ( hdr->code )
     {
-      eventType = wxEVT_COMMAND_TREE_SET_INFO;
-      TV_DISPINFO *info = (TV_DISPINFO *)lParam;
-      wxConvertFromMSWTreeItem(event.m_item, info->item, (HWND) GetHWND());
-      break;
+        case NM_DBLCLK:
+            // we translate NM_DBLCLK into ACTIVATED event and if the user
+            // handled the activation of the item we shouldn't proceed with
+            // also using the same double click for toggling the item expanded
+            // state -- but OTOH do let the user to expand/collapse the item by
+            // double clicking on it if the activation is not handled specially
+            *result = processed;
+            break;
+
+        case NM_RCLICK:
+            // prevent tree control from sending WM_CONTEXTMENU to our parent
+            // (which it does if NM_RCLICK is not handled) because we want to
+            // send it to the control itself
+            *result =
+            processed = true;
+
+            ::SendMessage(GetHwnd(), WM_CONTEXTMENU,
+                          (WPARAM)GetHwnd(), ::GetMessagePos());
+            break;
+
+        case TVN_BEGINDRAG:
+        case TVN_BEGINRDRAG:
+#if wxUSE_DRAGIMAGE
+            if ( event.IsAllowed() )
+            {
+                // normally this is impossible because the m_dragImage is
+                // deleted once the drag operation is over
+                wxASSERT_MSG( !m_dragImage, wxT("starting to drag once again?") );
+
+                m_dragImage = new wxDragImage(*this, event.m_item);
+                m_dragImage->BeginDrag(wxPoint(0,0), this);
+                m_dragImage->Show();
+
+                m_dragStarted = true;
+            }
+#endif // wxUSE_DRAGIMAGE
+            break;
+
+        case TVN_DELETEITEM:
+            {
+                // NB: we might process this message using wxWidgets event
+                //     tables, but due to overhead of wxWin event system we
+                //     prefer to do it here ourself (otherwise deleting a tree
+                //     with many items is just too slow)
+                NM_TREEVIEW *tv = (NM_TREEVIEW *)lParam;
+
+                wxTreeItemParam *param =
+                        (wxTreeItemParam *)tv->itemOld.lParam;
+                delete param;
+
+                processed = true; // Make sure we don't get called twice
+            }
+            break;
+
+        case TVN_BEGINLABELEDIT:
+            // return true to cancel label editing
+            *result = !event.IsAllowed();
+
+            // set ES_WANTRETURN ( like we do in BeginLabelEdit )
+            if ( event.IsAllowed() )
+            {
+                HWND hText = TreeView_GetEditControl(GetHwnd());
+                if ( hText )
+                {
+                    // MBN: if m_textCtrl already has an HWND, it is a stale
+                    // pointer from a previous edit (because the user
+                    // didn't modify the label before dismissing the control,
+                    // and TVN_ENDLABELEDIT was not sent), so delete it
+                    if ( m_textCtrl && m_textCtrl->GetHWND() )
+                        DeleteTextCtrl();
+                    if ( !m_textCtrl )
+                        m_textCtrl = new wxTextCtrl();
+                    m_textCtrl->SetParent(this);
+                    m_textCtrl->SetHWND((WXHWND)hText);
+                    m_textCtrl->SubclassWin((WXHWND)hText);
+
+                    // set wxTE_PROCESS_ENTER style for the text control to
+                    // force it to process the Enter presses itself, otherwise
+                    // they could be stolen from it by the dialog
+                    // navigation code
+                    m_textCtrl->SetWindowStyle(m_textCtrl->GetWindowStyle()
+                                               | wxTE_PROCESS_ENTER);
+                }
+            }
+            else // we had set m_idEdited before
+            {
+                m_idEdited.Unset();
+            }
+            break;
+
+        case TVN_ENDLABELEDIT:
+            // return true to set the label to the new string: note that we
+            // also must pretend that we did process the message or it is going
+            // to be passed to DefWindowProc() which will happily return false
+            // cancelling the label change
+            *result = event.IsAllowed();
+            processed = true;
+
+            // ensure that we don't have the text ctrl which is going to be
+            // deleted any more
+            DeleteTextCtrl();
+            break;
+
+#ifndef __WXWINCE__
+#ifdef TVN_GETINFOTIP
+         case TVN_GETINFOTIP:
+            {
+                // If the user permitted a tooltip change, change it
+                if (event.IsAllowed())
+                {
+                    SetToolTip(event.m_label);
+                }
+            }
+            break;
+#endif
+#endif
+
+        case TVN_SELCHANGING:
+        case TVN_ITEMEXPANDING:
+            // return true to prevent the action from happening
+            *result = !event.IsAllowed();
+            break;
+
+        case TVN_ITEMEXPANDED:
+            {
+                NM_TREEVIEW *tv = (NM_TREEVIEW *)lParam;
+                const wxTreeItemId id(tv->itemNew.hItem);
+
+                if ( tv->action == TVE_COLLAPSE )
+                {
+                    if ( wxApp::GetComCtl32Version() >= 600 )
+                    {
+                        // for some reason the item selection rectangle depends
+                        // on whether it is expanded or collapsed (at least
+                        // with comctl32.dll v6): it is wider (by 3 pixels) in
+                        // the expanded state, so when the item collapses and
+                        // then is deselected the rightmost 3 pixels of the
+                        // previously drawn selection are left on the screen
+                        //
+                        // it's not clear if it's a bug in comctl32.dll or in
+                        // our code (because it does not happen in Explorer but
+                        // OTOH we don't do anything which could result in this
+                        // AFAICS) but we do need to work around it to avoid
+                        // ugly artifacts
+                        RefreshItem(id);
+                    }
+                }
+                else // expand
+                {
+                    // the item is also not refreshed properly after expansion when
+                    // it has an image depending on the expanded/collapsed state:
+                    // again, it's not clear if the bug is in comctl32.dll or our
+                    // code...
+                    int image = GetItemImage(id, wxTreeItemIcon_Expanded);
+                    if ( image != -1 )
+                    {
+                        RefreshItem(id);
+                    }
+                }
+            }
+            break;
+
+        case TVN_GETDISPINFO:
+            // NB: so far the user can't set the image himself anyhow, so do it
+            //     anyway - but this may change later
+            //if ( /* !processed && */ )
+            {
+                wxTreeItemId item = event.m_item;
+                TV_DISPINFO *info = (TV_DISPINFO *)lParam;
+
+                const wxTreeItemParam * const param = GetItemParam(item);
+                if ( !param )
+                    break;
+
+                if ( info->item.mask & TVIF_IMAGE )
+                {
+                    info->item.iImage =
+                        param->GetImage
+                        (
+                         IsExpanded(item) ? wxTreeItemIcon_Expanded
+                                          : wxTreeItemIcon_Normal
+                        );
+                }
+                if ( info->item.mask & TVIF_SELECTEDIMAGE )
+                {
+                    info->item.iSelectedImage =
+                        param->GetImage
+                        (
+                         IsExpanded(item) ? wxTreeItemIcon_SelectedExpanded
+                                          : wxTreeItemIcon_Selected
+                        );
+                }
+            }
+            break;
+
+        //default:
+            // for the other messages the return value is ignored and there is
+            // nothing special to do
     }
+    return processed;
+}
 
-    default :
-      return wxControl::MSWNotify(wParam, lParam);
-      break;
-  }
+// ----------------------------------------------------------------------------
+// State control.
+// ----------------------------------------------------------------------------
 
-  event.SetEventObject(this);
-  event.SetEventType(eventType);
+// why do they define INDEXTOSTATEIMAGEMASK but not the inverse?
+#define STATEIMAGEMASKTOINDEX(state) (((state) & TVIS_STATEIMAGEMASK) >> 12)
 
-  if ( !GetEventHandler()->ProcessEvent(event) )
-    return FALSE;
+int wxTreeCtrl::DoGetItemState(const wxTreeItemId& item) const
+{
+    wxCHECK_MSG( item.IsOk(), wxTREE_ITEMSTATE_NONE, wxT("invalid tree item") );
 
-  if (hdr1->code == TVN_GETDISPINFO)
-  {
-    TV_DISPINFO *info = (TV_DISPINFO *)lParam;
-    wxConvertToMSWTreeItem(event.m_item, info->item);
-  }
+    // receive the desired information
+    wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_STATEIMAGEMASK);
+    DoGetItem(&tvItem);
 
-  return TRUE;
+    // state images are one-based
+    return STATEIMAGEMASKTOINDEX(tvItem.state) - 1;
 }
 
-// Tree item structure
-wxTreeItem::wxTreeItem(void)
+void wxTreeCtrl::DoSetItemState(const wxTreeItemId& item, int state)
 {
-    m_mask = 0;
-    m_itemId = 0;
-    m_state = 0;
-    m_stateMask = 0;
-    m_image = -1;
-    m_selectedImage = -1;
-    m_children = 0;
-  m_data = 0;
-}
+    wxCHECK_RET( item.IsOk(), wxT("invalid tree item") );
 
-// If getFullInfo is TRUE, we explicitly query for more info if we haven't got it all.
-static void wxConvertFromMSWTreeItem(wxTreeItem& info, TV_ITEM& tvItem, HWND getFullInfo)
-{
-  info.m_data = tvItem.lParam;
-  info.m_mask = 0;
-  info.m_state = 0;
-  info.m_stateMask = 0;
+    wxTreeViewItem tvItem(item, TVIF_STATE, TVIS_STATEIMAGEMASK);
 
-  long oldMask = tvItem.mask;
+    // state images are one-based
+    // 0 if no state image display (wxTREE_ITEMSTATE_NONE = -1)
+    tvItem.state = INDEXTOSTATEIMAGEMASK(state + 1);
 
-  bool needText = FALSE;
-  if (getFullInfo != 0)
-  {
-    if ( tvItem.mask & TVIF_TEXT )
-      needText = FALSE;
-    else
-      needText = TRUE;
+    DoSetItem(&tvItem);
+}
 
-    if ( needText )
-    {
-      tvItem.pszText = new char[513];
-      tvItem.cchTextMax = 512;
-    }
-    tvItem.mask |= TVIF_HANDLE | TVIF_STATE | TVIF_TEXT | TVIF_IMAGE | TVIF_SELECTEDIMAGE | TVIF_CHILDREN | TVIF_PARAM ;
-    ::SendMessage(getFullInfo, TVM_GETITEM, 0, (LPARAM)& tvItem) ;
-  }
+// ----------------------------------------------------------------------------
+// Update locking.
+// ----------------------------------------------------------------------------
 
-  if ( tvItem.mask & TVIF_HANDLE )
-  {
-    info.m_mask |= wxTREE_MASK_HANDLE;
-    info.m_itemId = (long) tvItem.hItem;
-  }
-  if ( tvItem.mask & TVIF_STATE )
-  {
-    info.m_mask |= wxTREE_MASK_STATE;
-      if ( tvItem.stateMask & TVIS_BOLD)
-    {
-      info.m_stateMask |= wxTREE_STATE_BOLD ;
-      if ( tvItem.state & TVIS_BOLD )
-        info.m_state |= wxTREE_STATE_BOLD ;
-    }
-
-      if ( tvItem.stateMask & TVIS_CUT)
-    {
-      info.m_stateMask |= wxTREE_STATE_CUT ;
-      if ( tvItem.state & TVIS_CUT )
-        info.m_state |= wxTREE_STATE_CUT ;
-    }
-
-      if ( tvItem.stateMask & TVIS_DROPHILITED)
-    {
-      info.m_stateMask |= wxTREE_STATE_DROPHILITED ;
-      if ( tvItem.state & TVIS_DROPHILITED )
-        info.m_state |= wxTREE_STATE_DROPHILITED ;
-    }
-      if ( tvItem.stateMask & TVIS_EXPANDED)
-    {
-      info.m_stateMask |= wxTREE_STATE_EXPANDED ;
-      if ( tvItem.state & TVIS_EXPANDED )
-        info.m_state |= wxTREE_STATE_EXPANDED ;
-    }
-      if ( tvItem.stateMask & TVIS_EXPANDEDONCE)
-    {
-      info.m_stateMask |= wxTREE_STATE_EXPANDEDONCE ;
-      if ( tvItem.state & TVIS_EXPANDEDONCE )
-        info.m_state |= wxTREE_STATE_EXPANDEDONCE ;
-    }
-      if ( tvItem.stateMask & TVIS_FOCUSED)
-    {
-      info.m_stateMask |= wxTREE_STATE_FOCUSED ;
-      if ( tvItem.state & TVIS_FOCUSED )
-        info.m_state |= wxTREE_STATE_FOCUSED ;
-    }
-      if ( tvItem.stateMask & TVIS_SELECTED)
-    {
-      info.m_stateMask |= wxTREE_STATE_SELECTED ;
-      if ( tvItem.state & TVIS_SELECTED )
-        info.m_state |= wxTREE_STATE_SELECTED ;
-    }
-  }
-
-  if ( tvItem.mask & TVIF_TEXT )
-  {
-    info.m_mask |= wxTREE_MASK_TEXT;
-    info.m_text = tvItem.pszText;
-  }
-  if ( tvItem.mask & TVIF_IMAGE )
-  {
-    info.m_mask |= wxTREE_MASK_IMAGE;
-    info.m_image = tvItem.iImage;
-  }
-  if ( tvItem.mask & TVIF_SELECTEDIMAGE )
-  {
-    info.m_mask |= wxTREE_MASK_SELECTED_IMAGE;
-    info.m_selectedImage = tvItem.iSelectedImage;
-  }
-  if ( tvItem.mask & TVIF_CHILDREN )
-  {
-    info.m_mask |= wxTREE_MASK_CHILDREN;
-    info.m_children = tvItem.cChildren;
-  }
-  if ( tvItem.mask & TVIF_PARAM )
-    info.m_mask |= wxTREE_MASK_DATA;
-
-  if (needText)
-  {
-        if (tvItem.pszText)
-      delete[] tvItem.pszText;
-  }
-  tvItem.mask = oldMask ;
-}
-
-static void wxConvertToMSWTreeItem(wxTreeItem& info, TV_ITEM& tvItem)
-{
-  tvItem.hItem = (HTREEITEM) info.m_itemId ;
-
-  tvItem.iImage = info.m_image ;
-  tvItem.iSelectedImage = info.m_selectedImage;
-  tvItem.cChildren = info.m_children;
-  tvItem.lParam = info.m_data;
-  tvItem.mask = 0;
-  tvItem.stateMask = 0;
-  tvItem.state = 0;
-
-  if (info.m_mask & wxTREE_MASK_HANDLE)
-    tvItem.mask |= TVIF_HANDLE ;
-  if (info.m_mask & wxTREE_MASK_STATE)
-    tvItem.mask |= TVIF_STATE ;
-  if (info.m_mask & wxTREE_MASK_TEXT)
-  {
-    tvItem.mask |= TVIF_TEXT ;
-    tvItem.pszText = (char *) (const char *)info.m_text ;
-    if ( tvItem.pszText )
-      tvItem.cchTextMax = info.m_text.Length();
-    else
-      tvItem.cchTextMax = 0;
-  }
-  if (info.m_mask & wxTREE_MASK_IMAGE)
-    tvItem.mask |= TVIF_IMAGE ;
-  if (info.m_mask & wxTREE_MASK_SELECTED_IMAGE)
-    tvItem.mask |= TVIF_SELECTEDIMAGE ;
-  if (info.m_mask & wxTREE_MASK_CHILDREN)
-    tvItem.mask |= TVIF_CHILDREN ;
-  if (info.m_mask & wxTREE_MASK_DATA)
-    tvItem.mask |= TVIF_PARAM ;
-
-  if (info.m_stateMask & wxTREE_STATE_BOLD)
-  {
-      tvItem.stateMask |= TVIS_BOLD ;
-    tvItem.state |= TVIS_BOLD;
-  }
-  if (info.m_stateMask & wxTREE_STATE_CUT)
-  {
-      tvItem.stateMask |= TVIS_CUT ;
-    if ( info.m_state & wxTREE_STATE_CUT )
-      tvItem.state |= TVIS_CUT;
-  }
-  if (info.m_stateMask & wxTREE_STATE_DROPHILITED)
-  {
-      tvItem.stateMask |= TVIS_DROPHILITED;
-    if ( info.m_state & wxTREE_STATE_DROPHILITED )
-        tvItem.state |= TVIS_DROPHILITED;
-  }
-  if (info.m_stateMask & wxTREE_STATE_EXPANDED)
-  {
-      tvItem.stateMask |= TVIS_EXPANDED;
-    if ( info.m_state & wxTREE_STATE_EXPANDED )
-        tvItem.state |= TVIS_EXPANDED;
-  }
-  if (info.m_stateMask & wxTREE_STATE_EXPANDEDONCE)
-  {
-      tvItem.stateMask |= TVIS_EXPANDEDONCE;
-    if ( info.m_state & wxTREE_STATE_EXPANDEDONCE )
-        tvItem.state |= TVIS_EXPANDEDONCE;
-  }
-  if (info.m_stateMask & wxTREE_STATE_FOCUSED)
-  {
-      tvItem.stateMask |= TVIS_FOCUSED;
-    if ( info.m_state & wxTREE_STATE_FOCUSED )
-        tvItem.state |= TVIS_FOCUSED;
-  }
-  if (info.m_stateMask & wxTREE_STATE_SELECTED)
-  {
-      tvItem.stateMask |= TVIS_SELECTED;
-    if ( info.m_state & wxTREE_STATE_SELECTED )
-        tvItem.state |= TVIS_SELECTED;
-  }
-}
-
-// Tree event
-IMPLEMENT_DYNAMIC_CLASS(wxTreeEvent, wxCommandEvent)
-
-wxTreeEvent::wxTreeEvent(wxEventType commandType, int id):
-  wxCommandEvent(commandType, id)
-{
-  m_code = 0;
-  m_oldItem = 0;
+// Using WM_SETREDRAW with the native control is a bad idea as it's broken in
+// some Windows versions (see http://support.microsoft.com/kb/130611) and
+// doesn't seem to do anything in other ones (e.g. under Windows 7 the tree
+// control keeps updating its scrollbars while the items are added to it,
+// resulting in horrible flicker when adding even a couple of dozen items).
+// So we hide it instead of freezing -- this still flickers, but actually not
+// as badly as it would if we didn't do it.
+
+void wxTreeCtrl::DoFreeze()
+{
+    // Notice that we don't call wxWindow::Hide() here as we want the window to
+    // remain shown from wxWidgets point of view and also because
+    // wxWindowMSW::Show() calls Do{Freeze,Thaw}() itself, so we'd get into
+    // infinite recursion this way.
+    if ( IsShown() )
+        ::ShowWindow(GetHwnd(), SW_HIDE);
 }
 
-#endif
+void wxTreeCtrl::DoThaw()
+{
+    if ( IsShown() )
+        ::ShowWindow(GetHwnd(), SW_SHOW);
+}
 
+#endif // wxUSE_TREECTRL