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[wxWidgets.git] / src / generic / treectrl.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        treectrl.cpp
// Purpose:     generic tree control implementation
// Author:      Robert Roebling
// Created:     01/02/97
// Modified:    22/10/98 - almost total rewrite, simpler interface (VZ)
// Id:          $Id$
// Copyright:   (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// =============================================================================
// declarations
// =============================================================================

// -----------------------------------------------------------------------------
// headers
// -----------------------------------------------------------------------------

#ifdef __GNUG__
  #pragma implementation "treectrl.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#include "wx/generic/treectrl.h"
#include "wx/generic/imaglist.h"
#include "wx/settings.h"
#include "wx/log.h"
#include "wx/intl.h"
#include "wx/dynarray.h"
#include "wx/dcclient.h"
#include "wx/msgdlg.h"

// -----------------------------------------------------------------------------
// array types
// -----------------------------------------------------------------------------

class WXDLLEXPORT wxGenericTreeItem;

WX_DEFINE_ARRAY(wxGenericTreeItem *, wxArrayTreeItems);

// -----------------------------------------------------------------------------
// private classes
// -----------------------------------------------------------------------------

// a tree item
class WXDLLEXPORT wxGenericTreeItem
{
public:
  // ctors & dtor
  wxGenericTreeItem() { m_data = NULL; }
  wxGenericTreeItem( wxGenericTreeItem *parent,
                     const wxString& text,
                     wxDC& dc,
                     int image, int selImage,
                     wxTreeItemData *data );

  ~wxGenericTreeItem();

  // trivial accessors
  wxArrayTreeItems& GetChildren() { return m_children; }

  const wxString& GetText() const { return m_text; }
  int GetImage() const { return m_image; }
  int GetSelectedImage() const { return m_selImage; }
  wxTreeItemData *GetData() const { return m_data; }

  void SetText( const wxString &text, wxDC& dc );
  void SetImage(int image) { m_image = image; }
  void SetSelectedImage(int image) { m_selImage = image; }
  void SetData(wxTreeItemData *data) { m_data = data; }

  void SetHasPlus(bool has = TRUE) { m_hasPlus = has; }

  void SetBold(bool bold) { m_isBold = bold; }

  int GetX() const { return m_x; }
  int GetY() const { return m_y; }

  void SetHeight(int h) { m_height = h; }

  void SetX(int x) { m_x = x; }
  void SetY(int y) { m_y = y; }

  wxGenericTreeItem *GetParent() const { return m_parent; }

  // operations
    // deletes all children notifying the treectrl about it if !NULL pointer
    // given
  void DeleteChildren(wxTreeCtrl *tree = NULL);
    // FIXME don't know what is it for
  void Reset();

  // get count of all children (and grand children if 'recursively')
  size_t GetChildrenCount(bool recursively = TRUE) const;

  void Insert(wxGenericTreeItem *child, size_t index)
    { m_children.Insert(child, index); }

  void SetCross( int x, int y );
  void GetSize( int &x, int &y );

  // return the item at given position (or NULL if no item), onButton is TRUE
  // if the point belongs to the item's button, otherwise it lies on the
  // button's label
  wxGenericTreeItem *HitTest( const wxPoint& point, bool &onButton );

  void Expand() { m_isCollapsed = FALSE; }
  void Collapse() { m_isCollapsed = TRUE; }

  void SetHilight( bool set = TRUE ) { m_hasHilight = set; }

  // status inquiries
  bool HasChildren() const { return !m_children.IsEmpty(); }
  bool HasHilight()  const { return m_hasHilight; }
  bool IsExpanded()  const { return !m_isCollapsed; }
  bool HasPlus()     const { return m_hasPlus || HasChildren(); }
  bool IsBold()      const { return m_isBold; }

private:
  wxString            m_text;

  int                 m_image,
                      m_selImage;

  wxTreeItemData     *m_data;

  // use bitfields to save size
  int                 m_isCollapsed :1;
  int                 m_hasHilight  :1; // same as focused
  int                 m_hasPlus     :1; // used for item which doesn't have
                                        // children but still has a [+] button
  int                 m_isBold      :1; // render the label in bold font

  int                 m_x, m_y;
  long                m_height, m_width;
  int                 m_xCross, m_yCross;
  int                 m_level;
  wxArrayTreeItems    m_children;
  wxGenericTreeItem  *m_parent;
};

// =============================================================================
// implementation
// =============================================================================

// -----------------------------------------------------------------------------
// wxTreeEvent
// -----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxTreeEvent, wxNotifyEvent)

wxTreeEvent::wxTreeEvent( wxEventType commandType, int id )
           : wxNotifyEvent( commandType, id )
{
  m_code = 0;
  m_itemOld = (wxGenericTreeItem *)NULL;
}

// -----------------------------------------------------------------------------
// wxGenericTreeItem
// -----------------------------------------------------------------------------

wxGenericTreeItem::wxGenericTreeItem(wxGenericTreeItem *parent,
                                     const wxString& text,
                                     wxDC& dc,
                                     int image, int selImage,
                                     wxTreeItemData *data)
                 : m_text(text)
{
  m_image = image;
  m_selImage = selImage;
  m_data = data;
  m_x = m_y = 0;
  m_xCross = m_yCross = 0;

  m_level = 0;

  m_isCollapsed = TRUE;
  m_hasHilight = FALSE;
  m_hasPlus = FALSE;
  m_isBold = FALSE;

  m_parent = parent;

  dc.GetTextExtent( m_text, &m_width, &m_height );
}

wxGenericTreeItem::~wxGenericTreeItem()
{
  delete m_data;

  wxASSERT_MSG( m_children.IsEmpty(),
                "please call DeleteChildren() before deleting the item" );
}

void wxGenericTreeItem::DeleteChildren(wxTreeCtrl *tree)
{
  size_t count = m_children.Count();
  for ( size_t n = 0; n < count; n++ )
  {
    wxGenericTreeItem *child = m_children[n];
    if ( tree )
    {
      tree->SendDeleteEvent(child);
    }

    child->DeleteChildren(tree);
    delete child;
  }

  m_children.Empty();
}

void wxGenericTreeItem::SetText( const wxString &text, wxDC& dc )
{
  m_text = text;

  dc.GetTextExtent( m_text, &m_width, &m_height );
}

void wxGenericTreeItem::Reset()
{
  m_text.Empty();
  m_image =
  m_selImage = -1;
  m_data = NULL;
  m_x = m_y =
  m_height = m_width = 0;
  m_xCross =
  m_yCross = 0;

  m_level = 0;

  DeleteChildren();
  m_isCollapsed = TRUE;

  m_parent = (wxGenericTreeItem *)NULL;
}

size_t wxGenericTreeItem::GetChildrenCount(bool recursively) const
{
  size_t count = m_children.Count();
  if ( !recursively )
    return count;

  size_t total = count;
  for ( size_t n = 0; n < count; n++ )
  {
    total += m_children[n]->GetChildrenCount();
  }

  return total;
}

void wxGenericTreeItem::SetCross( int x, int y )
{
  m_xCross = x;
  m_yCross = y;
}

void wxGenericTreeItem::GetSize( int &x, int &y )
{
  if ( y < m_y ) y = m_y;
  int width = m_x +  m_width;
  if (width > x) x = width;

  if (IsExpanded())
  {
    size_t count = m_children.Count();
    for ( size_t n = 0; n < count; n++ )
    {
      m_children[n]->GetSize( x, y );
    }
  }
}

wxGenericTreeItem *wxGenericTreeItem::HitTest( const wxPoint& point,
                                               bool &onButton )
{
  if ((point.y > m_y) && (point.y < m_y + m_height))
  {
    // FIXME why +5?
    if ((point.x > m_xCross-5) && (point.x < m_xCross+5) &&
        (point.y > m_yCross-5) && (point.y < m_yCross+5) &&
        (IsExpanded() || HasPlus()))
    {
      onButton = TRUE;
      return this;
    }

    int w = m_width;
    if (m_image != -1) w += 20;

    if ((point.x > m_x) && (point.x < m_x+w))
    {
      onButton = FALSE;
      return this;
    }
  }
  else
  {
    if (!m_isCollapsed)
    {
      size_t count = m_children.Count();
      for ( size_t n = 0; n < count; n++ )
      {
        wxGenericTreeItem *res = m_children[n]->HitTest( point, onButton );
        if ( res != NULL )
          return res;
      }
    }
  }

  return NULL;
}

// -----------------------------------------------------------------------------
// wxTreeCtrl implementation
// -----------------------------------------------------------------------------

IMPLEMENT_DYNAMIC_CLASS(wxTreeCtrl, wxScrolledWindow)

BEGIN_EVENT_TABLE(wxTreeCtrl,wxScrolledWindow)
  EVT_PAINT          (wxTreeCtrl::OnPaint)
  EVT_MOUSE_EVENTS   (wxTreeCtrl::OnMouse)
  EVT_CHAR           (wxTreeCtrl::OnChar)
  EVT_SET_FOCUS      (wxTreeCtrl::OnSetFocus)
  EVT_KILL_FOCUS     (wxTreeCtrl::OnKillFocus)
  EVT_IDLE           (wxTreeCtrl::OnIdle)
END_EVENT_TABLE()

// -----------------------------------------------------------------------------
// construction/destruction
// -----------------------------------------------------------------------------
void wxTreeCtrl::Init()
{
  m_current =
  m_anchor = (wxGenericTreeItem *) NULL;
  m_hasFocus = FALSE;
  m_dirty = FALSE;

  m_xScroll = 0;
  m_yScroll = 0;
  m_lineHeight = 10;
  m_indent = 15;

  m_hilightBrush = new wxBrush
    (
      wxSystemSettings::GetSystemColour(wxSYS_COLOUR_HIGHLIGHT),
      wxSOLID
    );

  m_imageListNormal =
  m_imageListState = (wxImageList *) NULL;

  m_dragCount = 0;
}

bool wxTreeCtrl::Create(wxWindow *parent, wxWindowID id,
                        const wxPoint& pos, const wxSize& size,
                        long style,
            const wxValidator &validator,
            const wxString& name )
{
  Init();

  wxScrolledWindow::Create( parent, id, pos, size, style|wxHSCROLL|wxVSCROLL, name );

  SetValidator( validator );

  SetBackgroundColour( *wxWHITE );
  m_dottedPen = wxPen( *wxBLACK, 0, 0 );

  return TRUE;
}

wxTreeCtrl::~wxTreeCtrl()
{
  wxDELETE( m_hilightBrush );

  DeleteAllItems();
}

// -----------------------------------------------------------------------------
// accessors
// -----------------------------------------------------------------------------

size_t wxTreeCtrl::GetCount() const
{
  return m_anchor == NULL ? 0u : m_anchor->GetChildrenCount();
}

void wxTreeCtrl::SetIndent(unsigned int indent)
{
  m_indent = indent;
  Refresh();
}

size_t wxTreeCtrl::GetChildrenCount(const wxTreeItemId& item, bool recursively)
{
  wxCHECK_MSG( item.IsOk(), 0u, "invalid tree item" );

  return item.m_pItem->GetChildrenCount(recursively);
}

// -----------------------------------------------------------------------------
// functions to work with tree items
// -----------------------------------------------------------------------------

wxString wxTreeCtrl::GetItemText(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), "", "invalid tree item" );

  return item.m_pItem->GetText();
}

int wxTreeCtrl::GetItemImage(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), -1, "invalid tree item" );

  return item.m_pItem->GetImage();
}

int wxTreeCtrl::GetItemSelectedImage(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), -1, "invalid tree item" );

  return item.m_pItem->GetSelectedImage();
}

wxTreeItemData *wxTreeCtrl::GetItemData(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), NULL, "invalid tree item" );

  return item.m_pItem->GetData();
}

void wxTreeCtrl::SetItemText(const wxTreeItemId& item, const wxString& text)
{
  wxCHECK_RET( item.IsOk(), "invalid tree item" );

  wxClientDC dc(this);
  item.m_pItem->SetText(text, dc);
}

void wxTreeCtrl::SetItemImage(const wxTreeItemId& item, int image)
{
  wxCHECK_RET( item.IsOk(), "invalid tree item" );

  item.m_pItem->SetImage(image);
}

void wxTreeCtrl::SetItemSelectedImage(const wxTreeItemId& item, int image)
{
  wxCHECK_RET( item.IsOk(), "invalid tree item" );

  item.m_pItem->SetSelectedImage(image);
}

void wxTreeCtrl::SetItemData(const wxTreeItemId& item, wxTreeItemData *data)
{
  wxCHECK_RET( item.IsOk(), "invalid tree item" );

  item.m_pItem->SetData(data);
}

void wxTreeCtrl::SetItemHasChildren(const wxTreeItemId& item, bool has)
{
  wxCHECK_RET( item.IsOk(), "invalid tree item" );

  item.m_pItem->SetHasPlus(has);
}

void wxTreeCtrl::SetItemBold(const wxTreeItemId& item, bool bold)
{
  wxCHECK_RET( item.IsOk(), "invalid tree item" );

  // avoid redrawing the tree if no real change
  wxGenericTreeItem *pItem = item.m_pItem;
  if ( pItem->IsBold() != bold )
  {
    pItem->SetBold(bold);
    RefreshLine(pItem);
  }
}

// -----------------------------------------------------------------------------
// item status inquiries
// -----------------------------------------------------------------------------

bool wxTreeCtrl::IsVisible(const wxTreeItemId& WXUNUSED(item)) const
{
  wxFAIL_MSG("not implemented");

  return TRUE;
}

bool wxTreeCtrl::ItemHasChildren(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), FALSE, "invalid tree item" );

  return !item.m_pItem->GetChildren().IsEmpty();
}

bool wxTreeCtrl::IsExpanded(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), FALSE, "invalid tree item" );

  return item.m_pItem->IsExpanded();
}

bool wxTreeCtrl::IsSelected(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), FALSE, "invalid tree item" );

  return item.m_pItem->HasHilight();
}

bool wxTreeCtrl::IsBold(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), FALSE, "invalid tree item" );

  return item.m_pItem->IsBold();
}

// -----------------------------------------------------------------------------
// navigation
// -----------------------------------------------------------------------------

wxTreeItemId wxTreeCtrl::GetParent(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );

  return item.m_pItem->GetParent();
}

wxTreeItemId wxTreeCtrl::GetFirstChild(const wxTreeItemId& item, long& cookie) const
{
  wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );

  cookie = 0;
  return GetNextChild(item, cookie);
}

wxTreeItemId wxTreeCtrl::GetNextChild(const wxTreeItemId& item, long& cookie) const
{
  wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );

  wxArrayTreeItems& children = item.m_pItem->GetChildren();
  if ( (size_t)cookie < children.Count() )
  {
    return children.Item(cookie++);
  }
  else
  {
    // there are no more of them
    return wxTreeItemId();
  }
}

wxTreeItemId wxTreeCtrl::GetLastChild(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );

  wxArrayTreeItems& children = item.m_pItem->GetChildren();
  return (children.IsEmpty() ? wxTreeItemId() : wxTreeItemId(children.Last()));
}

wxTreeItemId wxTreeCtrl::GetNextSibling(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );

  wxGenericTreeItem *i = item.m_pItem;
  wxGenericTreeItem *parent = i->GetParent();
  if ( parent == NULL )
  {
    // root item doesn't have any siblings
    return wxTreeItemId();
  }

  wxArrayTreeItems& siblings = parent->GetChildren();
  int index = siblings.Index(i);
  wxASSERT( index != wxNOT_FOUND ); // I'm not a child of my parent?

  size_t n = (size_t)(index + 1);
  return n == siblings.Count() ? wxTreeItemId() : wxTreeItemId(siblings[n]);
}

wxTreeItemId wxTreeCtrl::GetPrevSibling(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );

  wxGenericTreeItem *i = item.m_pItem;
  wxGenericTreeItem *parent = i->GetParent();
  if ( parent == NULL )
  {
    // root item doesn't have any siblings
    return wxTreeItemId();
  }

  wxArrayTreeItems& siblings = parent->GetChildren();
  int index = siblings.Index(i);
  wxASSERT( index != wxNOT_FOUND ); // I'm not a child of my parent?

  return index == 0 ? wxTreeItemId()
                    : wxTreeItemId(siblings[(size_t)(index - 1)]);
}

wxTreeItemId wxTreeCtrl::GetFirstVisibleItem() const
{
  wxFAIL_MSG("not implemented");

  return wxTreeItemId();
}

wxTreeItemId wxTreeCtrl::GetNextVisible(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );

  wxFAIL_MSG("not implemented");

  return wxTreeItemId();
}

wxTreeItemId wxTreeCtrl::GetPrevVisible(const wxTreeItemId& item) const
{
  wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );

  wxFAIL_MSG("not implemented");

  return wxTreeItemId();
}

// -----------------------------------------------------------------------------
// operations
// -----------------------------------------------------------------------------

wxTreeItemId wxTreeCtrl::DoInsertItem(const wxTreeItemId& parentId,
                                      size_t previous,
                                      const wxString& text,
                                      int image, int selImage,
                                      wxTreeItemData *data)
{
  wxGenericTreeItem *parent = parentId.m_pItem;
  if ( !parent )
  {
    // should we give a warning here?
    return AddRoot(text, image, selImage, data);
  }

  wxClientDC dc(this);
  wxGenericTreeItem *item = new wxGenericTreeItem(parent,
                                                  text, dc,
                                                  image, selImage,
                                                  data);

  if ( data != NULL )
  {
    data->m_pItem = item;
  }

  parent->Insert( item, previous );

  m_dirty = TRUE;

  return item;
}

wxTreeItemId wxTreeCtrl::AddRoot(const wxString& text,
                                 int image, int selImage,
                                 wxTreeItemData *data)
{
  wxCHECK_MSG( !m_anchor, wxTreeItemId(), "tree can have only one root" );

  wxClientDC dc(this);
  m_anchor = new wxGenericTreeItem((wxGenericTreeItem *)NULL, text, dc,
                                   image, selImage, data);
  if ( data != NULL )
  {
    data->m_pItem = m_anchor;
  }

  AdjustMyScrollbars();
  Refresh();

  return m_anchor;
}

wxTreeItemId wxTreeCtrl::PrependItem(const wxTreeItemId& parent,
                                     const wxString& text,
                                     int image, int selImage,
                                     wxTreeItemData *data)
{
  return DoInsertItem(parent, 0u, text, image, selImage, data);
}

wxTreeItemId wxTreeCtrl::InsertItem(const wxTreeItemId& parentId,
                                    const wxTreeItemId& idPrevious,
                                    const wxString& text,
                                    int image, int selImage,
                                    wxTreeItemData *data)
{
  wxGenericTreeItem *parent = parentId.m_pItem;
  if ( !parent )
  {
    // should we give a warning here?
    return AddRoot(text, image, selImage, data);
  }

  int index = parent->GetChildren().Index(idPrevious.m_pItem);
  wxASSERT_MSG( index != wxNOT_FOUND,
                "previous item in wxTreeCtrl::InsertItem() is not a sibling" );
  return DoInsertItem(parentId, (size_t)index, text, image, selImage, data);
}

wxTreeItemId wxTreeCtrl::AppendItem(const wxTreeItemId& parentId,
                                    const wxString& text,
                                    int image, int selImage,
                                    wxTreeItemData *data)
{
  wxGenericTreeItem *parent = parentId.m_pItem;
  if ( !parent )
  {
    // should we give a warning here?
    return AddRoot(text, image, selImage, data);
  }

  return DoInsertItem(parent, parent->GetChildren().Count(), text,
                      image, selImage, data);
}

void wxTreeCtrl::SendDeleteEvent(wxGenericTreeItem *item)
{
  wxTreeEvent event( wxEVT_COMMAND_TREE_DELETE_ITEM, GetId() );
  event.m_item = item;
  event.SetEventObject( this );
  ProcessEvent( event );
}

void wxTreeCtrl::DeleteChildren(const wxTreeItemId& itemId)
{
    wxGenericTreeItem *item = itemId.m_pItem;
    item->DeleteChildren(this);

    m_dirty = TRUE;
}

void wxTreeCtrl::Delete(const wxTreeItemId& itemId)
{
  wxGenericTreeItem *item = itemId.m_pItem;
  wxGenericTreeItem *parent = item->GetParent();

  if ( parent )
  {
    parent->GetChildren().Remove(item);
  }

  item->DeleteChildren(this);
  SendDeleteEvent(item);
  delete item;

  m_dirty = TRUE;
}

void wxTreeCtrl::DeleteAllItems()
{
  if ( m_anchor )
  {
    m_anchor->DeleteChildren(this);
    delete m_anchor;

    m_anchor = NULL;

    m_dirty = TRUE;
  }
}

void wxTreeCtrl::Expand(const wxTreeItemId& itemId)
{
  wxGenericTreeItem *item = itemId.m_pItem;

  if ( !item->HasPlus() )
    return;

  if ( item->IsExpanded() )
    return;

  wxTreeEvent event( wxEVT_COMMAND_TREE_ITEM_EXPANDING, GetId() );
  event.m_item = item;
  event.SetEventObject( this );
  if ( ProcessEvent( event ) && event.m_code )
  {
    // cancelled by program
    return;
  }

  item->Expand();
  CalculatePositions();

  RefreshSubtree(item);

  event.SetEventType(wxEVT_COMMAND_TREE_ITEM_EXPANDED);
  ProcessEvent( event );
}

void wxTreeCtrl::Collapse(const wxTreeItemId& itemId)
{
  wxGenericTreeItem *item = itemId.m_pItem;

  if ( !item->IsExpanded() )
    return;

  wxTreeEvent event( wxEVT_COMMAND_TREE_ITEM_COLLAPSING, GetId() );
  event.m_item = item;
  event.SetEventObject( this );
  if ( ProcessEvent( event ) && event.m_code )
  {
    // cancelled by program
    return;
  }

  item->Collapse();

  wxArrayTreeItems& children = item->GetChildren();
  size_t count = children.Count();
  for ( size_t n = 0; n < count; n++ )
  {
    Collapse(children[n]);
  }

  CalculatePositions();

  RefreshSubtree(item);

  event.SetEventType(wxEVT_COMMAND_TREE_ITEM_COLLAPSED);
  ProcessEvent( event );
}

void wxTreeCtrl::CollapseAndReset(const wxTreeItemId& item)
{
  Collapse(item);
  DeleteChildren(item);
}

void wxTreeCtrl::Toggle(const wxTreeItemId& itemId)
{
  wxGenericTreeItem *item = itemId.m_pItem;

  if ( item->IsExpanded() )
    Collapse(itemId);
  else
    Expand(itemId);
}

void wxTreeCtrl::Unselect()
{
  if ( m_current )
  {
    m_current->SetHilight( FALSE );
    RefreshLine( m_current );
  }
}

void wxTreeCtrl::SelectItem(const wxTreeItemId& itemId)
{
  wxGenericTreeItem *item = itemId.m_pItem;

  if ( m_current != item )
  {
    wxTreeEvent event( wxEVT_COMMAND_TREE_SEL_CHANGING, GetId() );
    event.m_item = item;
    event.m_itemOld = m_current;
    event.SetEventObject( this );
    if ( GetEventHandler()->ProcessEvent( event ) && event.WasVetoed() )
      return;

    if ( m_current )
    {
      m_current->SetHilight( FALSE );
      RefreshLine( m_current );
    }

    m_current = item;
    m_current->SetHilight( TRUE );
    RefreshLine( m_current );

    event.SetEventType(wxEVT_COMMAND_TREE_SEL_CHANGED);
    GetEventHandler()->ProcessEvent( event );
  }
}

void wxTreeCtrl::EnsureVisible(const wxTreeItemId& item)
{
    wxGenericTreeItem *gitem = item.m_pItem;

    int item_y = gitem->GetY();

    int start_x = 0;
    int start_y = 0;
    ViewStart( &start_x, &start_y );
    start_y *= 10;

    int client_h = 0;
    int client_w = 0;
    GetClientSize( &client_w, &client_h );

    if (item_y < start_y+3)
    {
        int x = 0;
        int y = 0;
        m_anchor->GetSize( x, y );
        y += 2*m_lineHeight;
        int x_pos = GetScrollPos( wxHORIZONTAL );
    SetScrollbars( 10, 10, x/10, y/10, x_pos, (item_y-client_h/2)/10 );
        return;
    }

    if (item_y > start_y+client_h-16)
    {
       int x = 0;
       int y = 0;
       m_anchor->GetSize( x, y );
       y += 2*m_lineHeight;
       int x_pos = GetScrollPos( wxHORIZONTAL );
       SetScrollbars( 10, 10, x/10, y/10, x_pos, (item_y-client_h/2)/10 );
       return;
    }
}

void wxTreeCtrl::ScrollTo(const wxTreeItemId& WXUNUSED(item))
{
    wxFAIL_MSG("not implemented");
}

wxTextCtrl *wxTreeCtrl::EditLabel( const wxTreeItemId& WXUNUSED(item),
                                   wxClassInfo* WXUNUSED(textCtrlClass) )
{
    wxFAIL_MSG("not implemented");

    return (wxTextCtrl*)NULL;
}

wxTextCtrl *wxTreeCtrl::GetEditControl() const
{
    wxFAIL_MSG("not implemented");

    return (wxTextCtrl*)NULL;
}

void wxTreeCtrl::EndEditLabel(const wxTreeItemId& WXUNUSED(item), bool WXUNUSED(discardChanges))
{
    wxFAIL_MSG("not implemented");
}

// FIXME: tree sorting functions are not reentrant and not MT-safe!
static wxTreeCtrl *s_treeBeingSorted = NULL;

static int tree_ctrl_compare_func(wxGenericTreeItem **item1,
                                  wxGenericTreeItem **item2)
{
    wxCHECK_MSG( s_treeBeingSorted, 0, "bug in wxTreeCtrl::SortChildren()" );

    return s_treeBeingSorted->OnCompareItems(*item1, *item2);
}

int wxTreeCtrl::OnCompareItems(const wxTreeItemId& item1,
                               const wxTreeItemId& item2)
{
    return strcmp(GetItemText(item1), GetItemText(item2));
}

void wxTreeCtrl::SortChildren(const wxTreeItemId& itemId)
{
    wxCHECK_RET( itemId.IsOk(), "invalid tree item" );

    wxGenericTreeItem *item = itemId.m_pItem;

    wxCHECK_RET( !s_treeBeingSorted,
                 "wxTreeCtrl::SortChildren is not reentrant" );

    wxArrayTreeItems& children = item->GetChildren();
    if ( children.Count() > 1 )
    {
        s_treeBeingSorted = this;
        children.Sort(tree_ctrl_compare_func);
        s_treeBeingSorted = NULL;

        m_dirty = TRUE;
    }
    //else: don't make the tree dirty as nothing changed
}

wxImageList *wxTreeCtrl::GetImageList() const
{
    return m_imageListNormal;
}

wxImageList *wxTreeCtrl::GetStateImageList() const
{
    return m_imageListState;
}

void wxTreeCtrl::SetImageList(wxImageList *imageList)
{
    m_imageListNormal = imageList;
}

void wxTreeCtrl::SetStateImageList(wxImageList *imageList)
{
    m_imageListState = imageList;
}

// -----------------------------------------------------------------------------
// helpers
// -----------------------------------------------------------------------------

void wxTreeCtrl::AdjustMyScrollbars()
{
    if (m_anchor)
    {
        int x = 0;
        int y = 0;
        m_anchor->GetSize( x, y );
        y += 2*m_lineHeight;
        int x_pos = GetScrollPos( wxHORIZONTAL );
        int y_pos = GetScrollPos( wxVERTICAL );
        SetScrollbars( 10, 10, x/10, y/10, x_pos, y_pos );
    }
    else
    {
        SetScrollbars( 0, 0, 0, 0 );
    }
}

void wxTreeCtrl::PaintItem(wxGenericTreeItem *item, wxDC& dc)
{
    /* render bold items in bold */
    wxFont fontOld;
    wxFont fontNew;

    if (item->IsBold())
    {
        fontOld = dc.GetFont();
        if (fontOld.Ok())
        {
          /* @@ is there any better way to make a bold variant of old font? */
          fontNew = wxFont( fontOld.GetPointSize(),
                            fontOld.GetFamily(),
                            fontOld.GetStyle(),
                            wxBOLD,
                            fontOld.GetUnderlined());
          dc.SetFont(fontNew);
        }
        else
        {
            wxFAIL_MSG("wxDC::GetFont() failed!");
        }
    }

    long text_w = 0;
    long text_h = 0;
    dc.GetTextExtent( item->GetText(), &text_w, &text_h );

    int image_h = 0;
    int image_w = 0;
    if ((item->IsExpanded()) && (item->GetSelectedImage() != -1))
    {
        m_imageListNormal->GetSize( item->GetSelectedImage(), image_w, image_h );
        image_w += 4;
    }
    else if (item->GetImage() != -1)
    {
        m_imageListNormal->GetSize( item->GetImage(), image_w, image_h );
        image_w += 4;
    }

    dc.DrawRectangle( item->GetX()-2, item->GetY()-2, image_w+text_w+4, text_h+4 );

    if ((item->IsExpanded()) && (item->GetSelectedImage() != -1))
    {
        dc.SetClippingRegion( item->GetX(), item->GetY(), image_w-2, text_h );
        m_imageListNormal->Draw( item->GetSelectedImage(), dc,
                                 item->GetX(), item->GetY()-1,
                                 wxIMAGELIST_DRAW_TRANSPARENT );
        dc.DestroyClippingRegion();
    }
    else if (item->GetImage() != -1)
    {
        dc.SetClippingRegion( item->GetX(), item->GetY(), image_w-2, text_h );
        m_imageListNormal->Draw( item->GetImage(), dc,
                                 item->GetX(), item->GetY()-1,
                                 wxIMAGELIST_DRAW_TRANSPARENT );
        dc.DestroyClippingRegion();
    }

    dc.SetBackgroundMode(wxTRANSPARENT);
    dc.DrawText( item->GetText(), image_w + item->GetX(), item->GetY() );

    /* restore normal font for bold items */
    if (fontOld.Ok())
    {
        dc.SetFont( fontOld);
    }
}

void wxTreeCtrl::PaintLevel( wxGenericTreeItem *item, wxDC &dc, int level, int &y )
{
    int horizX = level*m_indent;

    item->SetX( horizX+33 );
    item->SetY( y-m_lineHeight/3 );
    item->SetHeight( m_lineHeight );

    item->SetCross( horizX+15, y );

    int oldY = y;

    int exposed_x = dc.LogicalToDeviceX( 0 );
    int exposed_y = dc.LogicalToDeviceY( item->GetY()-2 );

    if (IsExposed( exposed_x, exposed_y, 10000, m_lineHeight+4 ))  // 10000 = very much
    {
        int startX = horizX;
        int endX = horizX + 10;

        if (!item->HasChildren()) endX += 20;

        dc.DrawLine( startX, y, endX, y );

        if (item->HasPlus())
        {
            dc.DrawLine( horizX+20, y, horizX+30, y );
            dc.SetPen( *wxGREY_PEN );
            dc.SetBrush( *wxWHITE_BRUSH );
            dc.DrawRectangle( horizX+10, y-4, 11, 9 );
            dc.SetPen( *wxBLACK_PEN );
            dc.DrawLine( horizX+13, y, horizX+18, y );

            if (!item->IsExpanded())
        {
                dc.DrawLine( horizX+15, y-2, horizX+15, y+3 );
        }
        }

        if (item->HasHilight())
        {
            dc.SetTextForeground( wxSystemSettings::GetSystemColour( wxSYS_COLOUR_HIGHLIGHTTEXT ) );

            dc.SetBrush( *m_hilightBrush );

            if (m_hasFocus)
                dc.SetPen( *wxBLACK_PEN );
            else
                dc.SetPen( *wxTRANSPARENT_PEN );

            PaintItem(item, dc);

            dc.SetPen( *wxBLACK_PEN );
            dc.SetTextForeground( *wxBLACK );
            dc.SetBrush( *wxWHITE_BRUSH );
        }
        else
        {
            dc.SetBrush( *wxWHITE_BRUSH );
            dc.SetPen( *wxTRANSPARENT_PEN );

            PaintItem(item, dc);

            dc.SetPen( *wxBLACK_PEN );
        }
    }

    if (item->IsExpanded())
    {
        int semiOldY = y;

        wxArrayTreeItems& children = item->GetChildren();
        size_t count = children.Count();
        for ( size_t n = 0; n < count; n++ )
        {
            y += m_lineHeight;
            semiOldY = y;
            PaintLevel( children[n], dc, level+1, y );
        }

        /* it may happen that the item is expanded but has no items (when you
         * delete all its children for example) - don't draw the vertical line
         * in this case */
        if (count > 0) dc.DrawLine( horizX+15, oldY+5, horizX+15, semiOldY );
    }
}

// -----------------------------------------------------------------------------
// wxWindows callbacks
// -----------------------------------------------------------------------------

void wxTreeCtrl::OnPaint( wxPaintEvent &WXUNUSED(event) )
{
    if ( !m_anchor )
        return;

    wxPaintDC dc(this);
    PrepareDC( dc );

    dc.SetFont( wxSystemSettings::GetSystemFont( wxSYS_DEFAULT_GUI_FONT ) );

    dc.SetPen( m_dottedPen );
    m_lineHeight = (int)(dc.GetCharHeight() + 4);

    int y = m_lineHeight / 2 + 2;
    PaintLevel( m_anchor, dc, 0, y );
}

void wxTreeCtrl::OnSetFocus( wxFocusEvent &WXUNUSED(event) )
{
    m_hasFocus = TRUE;

    if (m_current) RefreshLine( m_current );
}

void wxTreeCtrl::OnKillFocus( wxFocusEvent &WXUNUSED(event) )
{
    m_hasFocus = FALSE;

    if (m_current) RefreshLine( m_current );
}

void wxTreeCtrl::OnChar( wxKeyEvent &event )
{
    wxTreeEvent te( wxEVT_COMMAND_TREE_KEY_DOWN, GetId() );
    te.m_code = event.KeyCode();
    te.SetEventObject( this );
    GetEventHandler()->ProcessEvent( te );

    if (m_current == 0)
    {
        event.Skip();
        return;
    }

    switch (event.KeyCode())
    {
        case '+':
        case WXK_ADD:
            if (m_current->HasPlus() && !IsExpanded(m_current))
            {
                Expand(m_current);
            }
            break;

        case '-':
        case WXK_SUBTRACT:
            if (IsExpanded(m_current))
            {
                Collapse(m_current);
            }
            break;

        case '*':
        case WXK_MULTIPLY:
            Toggle(m_current);
            break;

        case ' ':
        case WXK_RETURN:
            {
                wxTreeEvent event( wxEVT_COMMAND_TREE_ITEM_ACTIVATED, GetId() );
                event.m_item = m_current;
                event.m_code = 0;
                event.SetEventObject( this );
                GetEventHandler()->ProcessEvent( event );
            }
            break;

            // up goes to the previous sibling or to the last of its children if
            // it's expanded
        case WXK_UP:
            {
                wxTreeItemId prev = GetPrevSibling( m_current );
                if (!prev)
                {
                    prev = GetParent( m_current );
                    long cockie = 0;
                    wxTreeItemId current = m_current;
                    if (current == GetFirstChild( prev, cockie ))
                    {
                        // otherwise we return to where we came from
                        SelectItem( prev );
                        EnsureVisible( prev );
                        break;
                    }
                }
                if (prev)
                {
                    while (IsExpanded(prev))
                    {
                        int c = (int)GetChildrenCount( prev, FALSE );
                        long cockie = 0;
                        prev = GetFirstChild( prev, cockie );
                        for (int i = 0; i < c-1; i++)
                            prev = GetNextSibling( prev );
                    }
                    SelectItem( prev );
                    EnsureVisible( prev );
                }
            }
            break;

            // left arrow goes to the parent
        case WXK_LEFT:
            {
                wxTreeItemId prev = GetParent( m_current );
                if (prev)
                {
                    EnsureVisible( prev );
                    SelectItem( prev );
                }
            }
            break;

        case WXK_RIGHT:
            // this works the same as the down arrow except that we also expand the
            // item if it wasn't expanded yet
            Expand(m_current);
            // fall through

        case WXK_DOWN:
            {
                if (IsExpanded(m_current))
                {
                    long cookie = 0;
                    wxTreeItemId child = GetFirstChild( m_current, cookie );
                    SelectItem( child );
                    EnsureVisible( child );
                }
                else
                {
                    wxTreeItemId next = GetNextSibling( m_current );
                    if (next == 0)
                    {
                        wxTreeItemId current = m_current;
                        while (current && !next)
                        {
                            current = GetParent( current );
                            if (current) next = GetNextSibling( current );
                        }
                    }
                    if (next != 0)
                    {
                        SelectItem( next );
                        EnsureVisible( next );
                    }
                }
            }
            break;

            // <End> selects the last visible tree item
        case WXK_END:
            {
                wxTreeItemId last = GetRootItem();

                while ( last.IsOk() && IsExpanded(last) )
                {
                    wxTreeItemId lastChild = GetLastChild(last);

                    // it may happen if the item was expanded but then all of
                    // its children have been deleted - so IsExpanded() returned
                    // TRUE, but GetLastChild() returned invalid item
                    if ( !lastChild )
                        break;

                    last = lastChild;
                }

                if ( last.IsOk() )
                {
                    EnsureVisible( last );
                    SelectItem( last );
                }
            }
            break;

            // <Home> selects the root item
        case WXK_HOME:
            {
                wxTreeItemId prev = GetRootItem();
                if (prev)
                {
                    EnsureVisible( prev );
                    SelectItem( prev );
                }
            }
            break;

        default:
            event.Skip();
    }
}

wxTreeItemId wxTreeCtrl::HitTest(const wxPoint& point, int& WXUNUSED(flags))
{
    bool onButton = FALSE;
    return m_anchor->HitTest( point, onButton );
}

void wxTreeCtrl::OnMouse( wxMouseEvent &event )
{
    if (!event.LeftIsDown()) m_dragCount = 0;

    if ( !(event.LeftDown() || event.LeftDClick() || event.Dragging()) ) return;

    if ( !m_anchor ) return;

    wxClientDC dc(this);
    PrepareDC(dc);
    long x = dc.DeviceToLogicalX( (long)event.GetX() );
    long y = dc.DeviceToLogicalY( (long)event.GetY() );

    bool onButton = FALSE;
    wxGenericTreeItem *item = m_anchor->HitTest( wxPoint(x,y), onButton );

    if (item == NULL) return;  /* we hit the blank area */

    if (event.Dragging())
    {
        if (m_dragCount == 2)  /* small drag latency (3?) */
        {
            m_dragCount = 0;

            wxTreeEvent nevent(wxEVT_COMMAND_TREE_BEGIN_DRAG, GetId());
            nevent.m_item = m_current;
            nevent.SetEventObject(this);
            GetEventHandler()->ProcessEvent(nevent);
        }
        else
        {
            m_dragCount++;
        }
        return;
    }

    if (!IsSelected(item)) SelectItem(item);  /* we dont support multiple selections, BTW */

    if (event.LeftDClick())
    {
        wxTreeEvent event( wxEVT_COMMAND_TREE_ITEM_ACTIVATED, GetId() );
        event.m_item = item;
        event.m_code = 0;
        event.SetEventObject( this );
        GetEventHandler()->ProcessEvent( event );
    }

    if (onButton)
    {
        Toggle( item );
    }
}

void wxTreeCtrl::OnIdle( wxIdleEvent &WXUNUSED(event) )
{
    /* after all changes have been done to the tree control,
     * we actually redraw the tree when everything is over */

    if (!m_dirty) return;

    m_dirty = FALSE;

    CalculatePositions();

    AdjustMyScrollbars();
}

// -----------------------------------------------------------------------------

void wxTreeCtrl::CalculateLevel( wxGenericTreeItem *item, wxDC &dc, int level, int &y )
{
    int horizX = level*m_indent;

    item->SetX( horizX+33 );
    item->SetY( y-m_lineHeight/3-2 );
    item->SetHeight( m_lineHeight );

    if ( !item->IsExpanded() )
    {
        /* we dont need to calculate collapsed branches */
        return;
    }

    wxArrayTreeItems& children = item->GetChildren();
    size_t count = children.Count();
    for ( size_t n = 0; n < count; n++ )
    {
        y += m_lineHeight;
        CalculateLevel( children[n], dc, level+1, y );  /* recurse */
    }
}

void wxTreeCtrl::CalculatePositions()
{
    if ( !m_anchor ) return;

    wxClientDC dc(this);
    PrepareDC( dc );

    dc.SetFont( wxSystemSettings::GetSystemFont( wxSYS_DEFAULT_GUI_FONT ) );

    dc.SetPen( m_dottedPen );
    m_lineHeight = (int)(dc.GetCharHeight() + 4);

    int y = m_lineHeight / 2 + 2;
    CalculateLevel( m_anchor, dc, 0, y ); /* start recursion */
}

void wxTreeCtrl::RefreshSubtree(wxGenericTreeItem *item)
{
    wxClientDC dc(this);
    PrepareDC(dc);

    int cw = 0;
    int ch = 0;
    GetClientSize( &cw, &ch );

    wxRect rect;
    rect.x = dc.LogicalToDeviceX( 0 );
    rect.width = cw;
    rect.y = dc.LogicalToDeviceY( item->GetY() );
    rect.height = ch;

    Refresh( TRUE, &rect );

    AdjustMyScrollbars();
}

void wxTreeCtrl::RefreshLine( wxGenericTreeItem *item )
{
    wxClientDC dc(this);
    PrepareDC( dc );

    wxRect rect;
    rect.x = dc.LogicalToDeviceX( item->GetX() - 2 );
    rect.y = dc.LogicalToDeviceY( item->GetY() - 2 );
    rect.width = 1000;
    rect.height = dc.GetCharHeight() + 6;

    Refresh( TRUE, &rect );
}