Fixed some warnings

[wxWidgets.git] / src / msw / choice.cpp

diff --git a/src/msw/choice.cpp b/src/msw/choice.cpp
index c1d7f28406629a5ce458a154b4cde6646c659410..30dad609d01e46fe6f04b30b8b75e892e1af7c69 100644 (file)
--- a/src/msw/choice.cpp
+++ b/src/msw/choice.cpp
@@ -1,342 +1,833 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        choice.cpp
+// Name:        src/msw/choice.cpp

 // Purpose:     wxChoice
 // Author:      Julian Smart
 // Purpose:     wxChoice
 // Author:      Julian Smart

-// Modified by:
+// Modified by: Vadim Zeitlin to derive from wxChoiceBase

 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Created:     04/01/98
 // RCS-ID:      $Id$

-// Copyright:   (c) Julian Smart and Markus Holzem
-// Licence:    wxWindows license
+// Copyright:   (c) Julian Smart
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

-#ifdef __GNUG__
-#pragma implementation "choice.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------

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

-#pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #endif
 

-#ifndef WX_PRECOMP
+#if wxUSE_CHOICE && !(defined(__SMARTPHONE__) && defined(__WXWINCE__))
+

 #include "wx/choice.h"
 #include "wx/choice.h"

+
+#ifndef WX_PRECOMP
+    #include "wx/utils.h"
+    #include "wx/app.h"
+    #include "wx/log.h"
+    #include "wx/brush.h"
+    #include "wx/settings.h"

 #endif
 
 #endif
 

+#include "wx/dynlib.h"
+

 #include "wx/msw/private.h"
 
 #include "wx/msw/private.h"
 

-#if !USE_SHARED_LIBRARY
-IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl)
-#endif
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// creation
+// ----------------------------------------------------------------------------
+
+bool wxChoice::Create(wxWindow *parent,
+                      wxWindowID id,
+                      const wxPoint& pos,
+                      const wxSize& size,
+                      int n, const wxString choices[],
+                      long style,
+                      const wxValidator& validator,
+                      const wxString& name)
+{
+    // Experience shows that wxChoice vs. wxComboBox distinction confuses
+    // quite a few people - try to help them
+    wxASSERT_MSG( !(style & wxCB_DROPDOWN) &&
+                  !(style & wxCB_READONLY) &&
+                  !(style & wxCB_SIMPLE),
+                  wxT("this style flag is ignored by wxChoice, you ")
+                  wxT("probably want to use a wxComboBox") );
+
+    return CreateAndInit(parent, id, pos, size, n, choices, style,
+                         validator, name);
+}

 
 

-bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
+bool wxChoice::CreateAndInit(wxWindow *parent,
+                             wxWindowID id,
+                             const wxPoint& pos,
+                             const wxSize& size,
+                             int n, const wxString choices[],
+                             long style,
+                             const wxValidator& validator,
+                             const wxString& name)
+{
+    // initialize wxControl
+    if ( !CreateControl(parent, id, pos, size, style, validator, name) )
+        return false;
+
+    // now create the real HWND
+    if ( !MSWCreateControl(wxT("COMBOBOX"), wxEmptyString, pos, size) )
+        return false;
+
+
+    // initialize the controls contents
+    Append(n, choices);
+
+    // and now we may finally size the control properly (if needed)
+    SetInitialSize(size);
+
+    return true;
+}
+
+void wxChoice::SetLabel(const wxString& label)

 {
 {

-  if (param == CBN_SELCHANGE)
-  {
-    wxCommandEvent event(wxEVENT_TYPE_CHOICE_COMMAND, m_windowId);
-    event.SetInt(GetSelection());
-    event.SetEventObject(this);
-    event.SetString(copystring(GetStringSelection()));
-    ProcessCommand(event);
-    delete[] event.GetString();
-    return TRUE;
-  }
-  else return FALSE;
-}
-
-bool wxChoice::Create(wxWindow *parent, wxWindowID id,
-           const wxPoint& pos,
-           const wxSize& size,
-                  int n, const wxString choices[],
-                  long style,
-           const wxValidator& validator,
-           const wxString& name)
-{
-  SetName(name);
-  SetValidator(validator);
-  if (parent) parent->AddChild(this);
-  SetBackgroundColour(parent->GetDefaultBackgroundColour()) ;
-  SetForegroundColour(parent->GetDefaultForegroundColour()) ;
-  no_strings = n;
-
-  m_windowStyle = style;
-
-  if ( id == -1 )
-       m_windowId = (int)NewControlId();
-  else
-       m_windowId = id;
-
-  int x = pos.x;
-  int y = pos.y;
-  int width = size.x;
-  int height = size.y;
-
-  long msStyle = WS_CHILD | CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL
-                   | WS_TABSTOP | WS_VISIBLE;
-  if (m_windowStyle & wxCB_SORT)
-    msStyle |= CBS_SORT;
-
-  bool want3D;
-  WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D) ;
-
-  // 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))
-    msStyle |= WS_BORDER;
-
-  HWND wx_combo = CreateWindowEx(exStyle, "COMBOBOX", NULL,
-                   msStyle,
-                   0, 0, 0, 0, (HWND) parent->GetHWND(), (HMENU)m_windowId,
-                   wxGetInstance(), NULL);
-/*
-#if CTL3D
-  if (want3D)
-  {
-    m_useCtl3D = TRUE;
-    Ctl3dSubclassCtl(wx_combo); // Does CTL3D affect the combobox? I think not.
-  }
+    if ( FindString(label) == wxNOT_FOUND )
+    {
+        // unless we explicitly do this here, CB_GETCURSEL will continue to
+        // return the index of the previously selected item which will result
+        // in wrongly replacing the value being set now with the previously
+        // value if the user simply opens and closes (without selecting
+        // anything) the combobox popup
+        SetSelection(-1);
+    }
+
+    wxChoiceBase::SetLabel(label);
+}
+
+bool wxChoice::Create(wxWindow *parent,
+                      wxWindowID id,
+                      const wxPoint& pos,
+                      const wxSize& size,
+                      const wxArrayString& choices,
+                      long style,
+                      const wxValidator& validator,
+                      const wxString& name)
+{
+    wxCArrayString chs(choices);
+    return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
+                  style, validator, name);
+}
+
+bool wxChoice::MSWShouldPreProcessMessage(WXMSG *pMsg)
+{
+    MSG *msg = (MSG *) pMsg;
+
+    // if the dropdown list is visible, don't preprocess certain keys
+    if ( msg->message == WM_KEYDOWN
+        && (msg->wParam == VK_ESCAPE || msg->wParam == VK_RETURN) )
+    {
+        if (::SendMessage(GetHwndOf(this), CB_GETDROPPEDSTATE, 0, 0))
+        {
+            return false;
+        }
+    }
+
+    return wxControl::MSWShouldPreProcessMessage(pMsg);
+}
+
+WXDWORD wxChoice::MSWGetStyle(long style, WXDWORD *exstyle) const
+{
+    // we never have an external border
+    WXDWORD msStyle = wxControl::MSWGetStyle
+                      (
+                        (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
+                      );
+
+    // WS_CLIPSIBLINGS is useful with wxChoice and doesn't seem to result in
+    // any problems
+    msStyle |= WS_CLIPSIBLINGS;
+
+    // wxChoice-specific styles
+    msStyle |= CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL;
+    if ( style & wxCB_SORT )
+        msStyle |= CBS_SORT;
+
+    return msStyle;
+}
+
+#ifndef EP_EDITTEXT
+    #define EP_EDITTEXT         1
+    #define ETS_NORMAL          1

 #endif
 #endif

-*/

 
 

-  m_hWnd = (WXHWND) wx_combo;
+wxVisualAttributes
+wxChoice::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
+{
+    // it is important to return valid values for all attributes from here,
+    // GetXXX() below rely on this
+    wxVisualAttributes attrs;

 
 

-  // Subclass again for purposes of dialog editing mode
-  SubclassWin((WXHWND) wx_combo);
+    // FIXME: Use better dummy window?
+    wxWindow* wnd = wxTheApp->GetTopWindow();
+    if (!wnd)
+        return attrs;

 
 

-  SetFont(* parent->GetFont());
+    attrs.font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);

 
 

-  int i;
-  for (i = 0; i < n; i++)
-    SendMessage(wx_combo, CB_INSERTSTRING, i, (LONG)(const char *)choices[i]);
-  SendMessage(wx_combo, CB_SETCURSEL, i, 0);
+    // there doesn't seem to be any way to get the text colour using themes
+    // API: TMT_TEXTCOLOR doesn't work neither for EDIT nor COMBOBOX
+    attrs.colFg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT);

 
 

-  SetSize(x, y, width, height);
+    // NB: use EDIT, not COMBOBOX (the latter works in XP but not Vista)
+    attrs.colBg = wnd->MSWGetThemeColour(L"EDIT",
+                                         EP_EDITTEXT,
+                                         ETS_NORMAL,
+                                         ThemeColourBackground,
+                                         wxSYS_COLOUR_WINDOW);

 
 

-  return TRUE;
+    return attrs;

 }
 
 }
 

-void wxChoice::Append(const wxString& item)
+wxChoice::~wxChoice()

 {
 {

-  SendMessage((HWND) GetHWND(), CB_ADDSTRING, 0, (LONG)(const char *)item);
+    Clear();
+}
+
+bool wxChoice::MSWGetComboBoxInfo(tagCOMBOBOXINFO* info) const
+{
+    // TODO-Win9x: Get rid of this once we officially drop support for Win9x
+    //             and just call the function directly.
+#if wxUSE_DYNLIB_CLASS
+    typedef BOOL (WINAPI *GetComboBoxInfo_t)(HWND, tagCOMBOBOXINFO*);
+    static GetComboBoxInfo_t s_pfnGetComboBoxInfo = NULL;
+    static bool s_triedToLoad = false;
+    if ( !s_triedToLoad )
+    {
+        s_triedToLoad = true;
+        wxLoadedDLL dllUser32("user32.dll");
+        wxDL_INIT_FUNC(s_pfn, GetComboBoxInfo, dllUser32);
+    }
+
+    if ( s_pfnGetComboBoxInfo )
+        return (*s_pfnGetComboBoxInfo)(GetHwnd(), info) != 0;
+#endif // wxUSE_DYNLIB_CLASS
+
+    return false;
+}
+
+// ----------------------------------------------------------------------------
+// adding/deleting items to/from the list
+// ----------------------------------------------------------------------------
+
+int wxChoice::DoInsertItems(const wxArrayStringsAdapter& items,
+                            unsigned int pos,
+                            void **clientData, wxClientDataType type)
+{
+    MSWAllocStorage(items, CB_INITSTORAGE);
+
+    const bool append = pos == GetCount();
+
+    // use CB_ADDSTRING when appending at the end to make sure the control is
+    // resorted if it has wxCB_SORT style
+    const unsigned msg = append ? CB_ADDSTRING : CB_INSERTSTRING;
+
+    if ( append )
+        pos = 0;
+
+    int n = wxNOT_FOUND;
+    const unsigned numItems = items.GetCount();
+    for ( unsigned i = 0; i < numItems; ++i )
+    {
+        n = MSWInsertOrAppendItem(pos, items[i], msg);
+        if ( n == wxNOT_FOUND )
+            return n;
+
+        if ( !append )
+            pos++;
+
+        AssignNewItemClientData(n, clientData, i, type);
+    }
+
+    // we need to refresh our size in order to have enough space for the
+    // newly added items
+    if ( !IsFrozen() )
+        MSWUpdateDropDownHeight();
+
+    InvalidateBestSize();

 
 

-  no_strings ++;
+    return n;

 }
 
 }
 

-void wxChoice::Delete(int n)
+void wxChoice::DoDeleteOneItem(unsigned int n)

 {
 {

-  no_strings = (int)SendMessage((HWND) GetHWND(), CB_DELETESTRING, n, 0);
+    wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::Delete") );
+
+    SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
+
+    if ( !IsFrozen() )
+        MSWUpdateDropDownHeight();
+
+    InvalidateBestSize();

 }
 
 }
 

-void wxChoice::Clear(void)
+void wxChoice::DoClear()

 {
 {

-  SendMessage((HWND) GetHWND(), CB_RESETCONTENT, 0, 0);
+    SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
+
+    if ( !IsFrozen() )
+        MSWUpdateDropDownHeight();

 
 

-  no_strings = 0;
+    InvalidateBestSize();

 }
 
 }
 

+// ----------------------------------------------------------------------------
+// selection
+// ----------------------------------------------------------------------------
+
+int wxChoice::GetSelection() const
+{
+    // if m_lastAcceptedSelection is set, it means that the dropdown is
+    // currently shown and that we want to use the last "permanent" selection
+    // instead of whatever is under the mouse pointer currently
+    //
+    // otherwise, get the selection from the control
+    return m_lastAcceptedSelection == wxID_NONE ? GetCurrentSelection()
+                                                : m_lastAcceptedSelection;
+}

 
 

-int wxChoice::GetSelection(void) const
+int wxChoice::GetCurrentSelection() const

 {
 {

-  return (int)SendMessage((HWND) GetHWND(), CB_GETCURSEL, 0, 0);
+    return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0);

 }
 
 void wxChoice::SetSelection(int n)
 {
 }
 
 void wxChoice::SetSelection(int n)
 {

-  SendMessage((HWND) GetHWND(), CB_SETCURSEL, n, 0);
+    SendMessage(GetHwnd(), CB_SETCURSEL, n, 0);

 }
 
 }
 

-int wxChoice::FindString(const wxString& s) const
+// ----------------------------------------------------------------------------
+// string list functions
+// ----------------------------------------------------------------------------
+
+unsigned int wxChoice::GetCount() const
+{
+    return (unsigned int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
+}
+
+int wxChoice::FindString(const wxString& s, bool bCase) const

 {
 #if defined(__WATCOMC__) && defined(__WIN386__)
 {
 #if defined(__WATCOMC__) && defined(__WIN386__)

-  // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
-  // Do it the long way instead.
-  char buf[512];
-  for (int i = 0; i < Number(); i++)
-  {
-    int len = (int)SendMessage((HWND) GetHWND(), CB_GETLBTEXT, i, (LPARAM)(LPSTR)buf);
-    buf[len] = 0;
-    if (strcmp(buf, (const char *)s) == 0)
-      return i;
-  }
-  return -1;
-#else
- int pos = (int)SendMessage((HWND) GetHWND(), CB_FINDSTRINGEXACT, (WPARAM)-1, (LPARAM)(LPSTR)(const char *)s);
- if (pos == LB_ERR)
-   return -1;
- else
-   return pos;
-#endif
+    // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
+    // wxChoice::Do it the long way instead.
+    unsigned int count = GetCount();
+    for ( unsigned int i = 0; i < count; i++ )
+    {
+        // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too
+        if (GetString(i).IsSameAs(s, bCase))
+            return i;
+    }
+
+    return wxNOT_FOUND;
+#else // !Watcom
+   //TODO:  Evidently some MSW versions (all?) don't like empty strings
+   //passed to SendMessage, so we have to do it ourselves in that case
+   if ( s.empty() )
+   {
+       unsigned int count = GetCount();
+       for ( unsigned int i = 0; i < count; i++ )
+       {
+         if (GetString(i).empty())
+             return i;
+       }
+
+       return wxNOT_FOUND;
+   }
+   else if (bCase)
+   {
+       // back to base class search for not native search type
+       return wxItemContainerImmutable::FindString( s, bCase );
+   }
+   else
+   {
+       int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT,
+                                  (WPARAM)-1, wxMSW_CONV_LPARAM(s));
+
+       return pos == LB_ERR ? wxNOT_FOUND : pos;
+   }
+#endif // Watcom/!Watcom
+}
+
+void wxChoice::SetString(unsigned int n, const wxString& s)
+{
+    wxCHECK_RET( IsValid(n), wxT("invalid item index in wxChoice::SetString") );
+
+    // we have to delete and add back the string as there is no way to change a
+    // string in place
+
+    // we need to preserve the client data manually
+    void *oldData = NULL;
+    wxClientData *oldObjData = NULL;
+    if ( HasClientUntypedData() )
+        oldData = GetClientData(n);
+    else if ( HasClientObjectData() )
+        oldObjData = GetClientObject(n);
+
+    // and also the selection if we're going to delete the item that was
+    // selected
+    const bool wasSelected = static_cast<int>(n) == GetSelection();
+
+    ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
+    ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, wxMSW_CONV_LPARAM(s) );
+
+    // restore the client data
+    if ( oldData )
+        SetClientData(n, oldData);
+    else if ( oldObjData )
+        SetClientObject(n, oldObjData);
+
+    // and the selection
+    if ( wasSelected )
+        SetSelection(n);
+
+    // the width could have changed so the best size needs to be recomputed
+    InvalidateBestSize();

 }
 
 }
 

-wxString wxChoice::GetString(int n) const
+wxString wxChoice::GetString(unsigned int n) const

 {
 {

-  int len = (int)SendMessage((HWND) GetHWND(), CB_GETLBTEXT, n, (long)wxBuffer);
-  wxBuffer[len] = 0;
-  return wxString(wxBuffer);
+    int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0);
+
+    wxString str;
+    if ( len != CB_ERR && len > 0 )
+    {
+        if ( ::SendMessage
+               (
+                GetHwnd(),
+                CB_GETLBTEXT,
+                n,
+                (LPARAM)(wxChar *)wxStringBuffer(str, len)
+               ) == CB_ERR )
+        {
+            wxLogLastError(wxT("SendMessage(CB_GETLBTEXT)"));
+        }
+    }
+
+    return str;

 }
 
 }
 

-void wxChoice::SetSize(int x, int y, int width, int height, int sizeFlags)
+// ----------------------------------------------------------------------------
+// client data
+// ----------------------------------------------------------------------------
+
+void wxChoice::DoSetItemClientData(unsigned int n, void* clientData)

 {
 {

-  int currentX, currentY;
-  GetPosition(&currentX, &currentY);
+    if ( ::SendMessage(GetHwnd(), CB_SETITEMDATA,
+                       n, (LPARAM)clientData) == CB_ERR )
+    {
+        wxLogLastError(wxT("CB_SETITEMDATA"));
+    }
+}

 
 

-  int x1 = x;
-  int y1 = y;
-  int w1 = width;
-  int h1 = height;
+void* wxChoice::DoGetItemClientData(unsigned int n) const
+{
+    LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0);
+    if ( rc == CB_ERR && GetLastError() != ERROR_SUCCESS )
+    {
+        wxLogLastError(wxT("CB_GETITEMDATA"));

 
 

-  if (x == -1 || (sizeFlags & wxSIZE_ALLOW_MINUS_ONE))
-    x1 = currentX;
-  if (y == -1 || (sizeFlags & wxSIZE_ALLOW_MINUS_ONE))
-    y1 = currentY;
+        // unfortunately, there is no way to return an error code to the user
+        rc = (LPARAM) NULL;
+    }

 
 

-  AdjustForParentClientOrigin(x1, y1, sizeFlags);
+    return (void *)rc;
+}

 
 

-  // If we're prepared to use the existing size, then...
-  if (width == -1 && height == -1 && ((sizeFlags & wxSIZE_AUTO) != wxSIZE_AUTO))
-  {
-    GetSize(&w1, &h1);
-  }
+// ----------------------------------------------------------------------------
+// wxMSW-specific geometry management
+// ----------------------------------------------------------------------------

 
 

-  int cx; // button font dimensions
-  int cy;
-  wxGetCharSize(GetHWND(), &cx, &cy, GetFont());
+namespace
+{

 
 

-  float control_width, control_height;
+// there is a difference between the height passed to CB_SETITEMHEIGHT and the
+// real height of the combobox; it is probably not constant for all Windows
+// versions/settings but right now I don't know how to find what it is so it is
+// temporarily hardcoded to its value under XP systems with normal fonts sizes
+const int COMBO_HEIGHT_ADJ = 6;

 
 

-  // Ignore height parameter because height doesn't
-  // mean 'initially displayed' height, it refers to the
-  // drop-down menu as well. The wxWindows interpretation
-  // is different; also, getting the size returns the
-  // _displayed_ size (NOT the drop down menu size)
-  // so setting-getting-setting size would not work.
-  h1 = -1;
+} // anonymous namespace

 
 

-  // Deal with default size (using -1 values)
-  if (width <= 0)
-  {
-    // Find the longest string
-    if (no_strings == 0)
-      control_width = (float)100.0;
-    else
+void wxChoice::MSWUpdateVisibleHeight()
+{
+    if ( m_heightOwn != wxDefaultCoord )

     {
     {

-      int len, ht;
-      float longest = (float)0.0;
-      int i;
-      for (i = 0; i < no_strings; i++)
-      {
-        wxString str(GetString(i));
-        GetTextExtent(str, &len, &ht, NULL, NULL,GetFont());
-        if ( len > longest) longest = len;
-      }
-
-      control_width = (float)(int)(longest + cx*5);
+        ::SendMessage(GetHwnd(), CB_SETITEMHEIGHT,
+                      (WPARAM)-1, m_heightOwn - COMBO_HEIGHT_ADJ);

     }
     }

-  }
+}

 
 

-  // Choice drop-down list depends on number of items (limited to 10)
-  if (h1 <= 0)
-  {
-    if (no_strings == 0)
-      h1 = (int)(EDIT_CONTROL_FACTOR*cy*10.0);
-    else h1 = (int)(EDIT_CONTROL_FACTOR*cy*(wxMin(10, no_strings) + 1));
-  }
+#if wxUSE_DEFERRED_SIZING
+void wxChoice::MSWEndDeferWindowPos()
+{
+    // we can only set the height of the choice itself now as it is reset to
+    // default every time the control is resized
+    MSWUpdateVisibleHeight();
+
+    wxChoiceBase::MSWEndDeferWindowPos();
+}
+#endif // wxUSE_DEFERRED_SIZING
+
+void wxChoice::MSWUpdateDropDownHeight()
+{
+    // be careful to not change the width here
+    DoSetSize(wxDefaultCoord, wxDefaultCoord, wxDefaultCoord, GetSize().y,
+              wxSIZE_USE_EXISTING);
+}

 
 

-  // If non-default width...
-  if (width >= 0)
-    control_width = (float)width;
+void wxChoice::DoMoveWindow(int x, int y, int width, int height)
+{
+    // here is why this is necessary: if the width is negative, the combobox
+    // window proc makes the window of the size width*height instead of
+    // interpreting height in the usual manner (meaning the height of the drop
+    // down list - usually the height specified in the call to MoveWindow()
+    // will not change the height of combo box per se)
+    //
+    // this behaviour is not documented anywhere, but this is just how it is
+    // here (NT 4.4) and, anyhow, the check shouldn't hurt - however without
+    // the check, constraints/sizers using combos may break the height
+    // constraint will have not at all the same value as expected
+    if ( width < 0 )
+        return;
+
+    wxControl::DoMoveWindow(x, y, width, height);
+}

 
 

-  control_height = (float)h1;
+void wxChoice::DoGetSize(int *w, int *h) const
+{
+    wxControl::DoGetSize(w, h);
+
+    // this is weird: sometimes, the height returned by Windows is clearly the
+    // total height of the control including the drop down list -- but only
+    // sometimes, and sometimes it isn't so work around this here by using our
+    // own stored value if we have it
+    if ( h && m_heightOwn != wxDefaultCoord )
+        *h = m_heightOwn;
+}
+
+void wxChoice::DoSetSize(int x, int y,
+                         int width, int height,
+                         int sizeFlags)
+{
+    const int heightBest = GetBestSize().y;
+
+    // we need the real height below so get the current one if it's not given
+    if ( height == wxDefaultCoord )
+    {
+        // height not specified, use the same as before
+        DoGetSize(NULL, &height);
+    }
+    else if ( height == heightBest )
+    {
+        // we don't need to manually manage our height, let the system use the
+        // default one
+        m_heightOwn = wxDefaultCoord;
+    }
+    else // non-default height specified
+    {
+        // set our new own height but be careful not to make it too big: the
+        // native control apparently stores it as a single byte and so setting
+        // own height to 256 pixels results in default height being used (255
+        // is still ok)
+        m_heightOwn = height;
+
+        if ( m_heightOwn > UCHAR_MAX )
+            m_heightOwn = UCHAR_MAX;
+        // nor too small: see MSWUpdateVisibleHeight()
+        else if ( m_heightOwn < COMBO_HEIGHT_ADJ )
+            m_heightOwn = COMBO_HEIGHT_ADJ;
+    }

 
 

-  // Calculations may have made text size too small
-  if (control_height <= 0)
-    control_height = (float)(int)(cy*EDIT_CONTROL_FACTOR) ;

 
 

-  if (control_width <= 0)
-    control_width = (float)100.0;
+    // the height which we must pass to Windows should be the total height of
+    // the control including the drop down list while the height given to us
+    // is, of course, just the height of the permanently visible part of it so
+    // add the drop down height to it

 
 

-  MoveWindow((HWND) GetHWND(), x1, y1,
-                              (int)control_width, (int)control_height, TRUE);
+    // don't make the drop down list too tall, arbitrarily limit it to 30
+    // items max and also don't make it too small if it's currently empty
+    size_t nItems = GetCount();
+    if (!HasFlag(wxCB_SIMPLE))
+    {
+        if ( !nItems )
+            nItems = 9;
+        else if ( nItems > 30 )
+            nItems = 30;
+    }
+
+    const int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, 0, 0);
+    int heightWithItems = 0;
+    if (!HasFlag(wxCB_SIMPLE))
+        // The extra item (" + 1") is required to prevent a vertical
+        // scrollbar from appearing with comctl32.dll versions earlier
+        // than 6.0 (such as found in Win2k).
+        heightWithItems = height + hItem*(nItems + 1);
+    else
+        heightWithItems = SetHeightSimpleComboBox(nItems);
+
+
+    // do resize the native control
+    wxControl::DoSetSize(x, y, width, heightWithItems, sizeFlags);
+
+
+    // make the control itself of the requested height: notice that this
+    // must be done after changing its size or it has no effect (apparently
+    // the height is reset to default during the control layout) and that it's
+    // useless to do it when using the deferred sizing -- in this case it
+    // will be done from MSWEndDeferWindowPos()
+#if wxUSE_DEFERRED_SIZING
+    if ( m_pendingSize == wxDefaultSize )
+    {
+        // not using deferred sizing, update it immediately
+        MSWUpdateVisibleHeight();
+    }
+    else // in the middle of deferred sizing
+    {
+        // we need to report the size of the visible part of the control back
+        // in GetSize() and not height stored by DoSetSize() in m_pendingSize
+        m_pendingSize = wxSize(width, height);
+    }
+#else // !wxUSE_DEFERRED_SIZING
+    // always update the visible height immediately
+    MSWUpdateVisibleHeight();
+#endif // wxUSE_DEFERRED_SIZING
+}
+
+wxSize wxChoice::DoGetBestSize() const
+{
+    // The base version returns the size of the largest string
+    return GetSizeFromTextSize(wxChoiceBase::DoGetBestSize().x);

 }
 
 }
 

-WXHBRUSH wxChoice::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
-                       WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
+int wxChoice::SetHeightSimpleComboBox(int nItems) const

 {
 {

-       return 0;
+    int cx, cy;
+    wxGetCharSize( GetHWND(), &cx, &cy, GetFont() );
+    int hItem = SendMessage(GetHwnd(), CB_GETITEMHEIGHT, (WPARAM)-1, 0);
+    return EDIT_HEIGHT_FROM_CHAR_HEIGHT( cy ) * wxMin( wxMax( nItems, 3 ), 6 ) + hItem - 1;

 }
 
 }
 

-long wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
+wxSize wxChoice::DoGetSizeFromTextSize(int xlen, int ylen) const

 {
 {

-    switch (nMsg)
+    int cHeight = GetCharHeight();
+
+    // We are interested in the difference of sizes between the whole control
+    // and its child part. I.e. arrow, separators, etc.
+    wxSize tsize(xlen, 0);
+
+    // FIXME-VC6: Only VC6 needs this guard, see WINVER definition in
+    //            include/wx/msw/wrapwin.h
+#if defined(WINVER) && WINVER >= 0x0500
+    WinStruct<COMBOBOXINFO> info;
+    if ( MSWGetComboBoxInfo(&info) )

     {
     {

-/*
-      case WM_GETDLGCODE:
-      {
-        if (GetWindowStyleFlag() & wxPROCESS_ENTER)
-          return DLGC_WANTALLKEYS;
-        break;
-      }
-*/
-/*
-      case WM_CHAR: // Always an ASCII character
-      {
-        if (wParam == VK_RETURN)
-        {
-          wxCommandEvent event(wxEVENT_TYPE_TEXT_ENTER_COMMAND);
-          event.commandString = ((wxTextCtrl *)item)->GetValue();
-          event.eventObject = item;
-          item->ProcessCommand(event);
-          return FALSE;
-        }
-        break;
-      }
-*/
-      case WM_LBUTTONUP:
-      {
-        int x = (int)LOWORD(lParam);
-        int y = (int)HIWORD(lParam);
-
-       // Ok, this is truly weird, but if a panel with a wxChoice loses the
-       // focus, then you get a *fake* WM_LBUTTONUP message
-       // with x = 65535 and y = 65535.
-       // Filter out this nonsense.
-       if (x == 65535 && y == 65535)
-         return Default();
-       break;
-      }
+        tsize.x += info.rcItem.left + info.rcButton.right - info.rcItem.right
+                    + info.rcItem.left + 3; // right and extra margins

     }
     }

+    else // Just use some rough approximation.
+#endif // WINVER >= 0x0500
+    {
+        tsize.x += 4*cHeight;
+    }
+
+    // set height on our own
+    if( HasFlag( wxCB_SIMPLE ) )
+        tsize.y = SetHeightSimpleComboBox(GetCount());
+    else
+        tsize.y = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cHeight);
+
+    // Perhaps the user wants something different from CharHeight
+    if ( ylen > 0 )
+        tsize.IncBy(0, ylen - cHeight);

 
 

-  return wxWindow::MSWWindowProc(nMsg, wParam, lParam);
+    return tsize;

 }
 
 }
 

-wxString wxChoice::GetStringSelection (void) const
+// ----------------------------------------------------------------------------
+// Popup operations
+// ----------------------------------------------------------------------------
+
+void wxChoice::MSWDoPopupOrDismiss(bool show)

 {
 {

-  int sel = GetSelection ();
-  if (sel > -1)
-    return wxString(this->GetString (sel));
-  else
-    return wxString("");
+    wxASSERT_MSG( !HasFlag(wxCB_SIMPLE),
+                  wxT("can't popup/dismiss the list for simple combo box") );
+
+    // we *must* set focus to the combobox before showing or hiding the drop
+    // down as without this we get WM_LBUTTONDOWN messages with invalid HWND
+    // when hiding it (whether programmatically or manually) resulting in a
+    // crash when we pass them to IsDialogMessage()
+    //
+    // this can be seen in the combo page of the widgets sample under Windows 7
+    SetFocus();
+
+    ::SendMessage(GetHwnd(), CB_SHOWDROPDOWN, show, 0);

 }
 
 }
 

-bool wxChoice::SetStringSelection (const wxString& s)
+bool wxChoice::Show(bool show)

 {
 {

-  int sel = FindString (s);
-  if (sel > -1)
+    if ( !wxChoiceBase::Show(show) )
+        return false;
+
+    // When hiding the combobox, we also need to hide its popup part as it
+    // doesn't happen automatically.
+    if ( !show && ::SendMessage(GetHwnd(), CB_GETDROPPEDSTATE, 0, 0) )
+        MSWDoPopupOrDismiss(false);
+
+    return true;
+}
+
+// ----------------------------------------------------------------------------
+// MSW message handlers
+// ----------------------------------------------------------------------------
+
+WXLRESULT wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
+{
+    switch ( nMsg )

     {
     {

-      SetSelection (sel);
-      return TRUE;
+        case WM_LBUTTONUP:
+            {
+                int x = (int)LOWORD(lParam);
+                int y = (int)HIWORD(lParam);
+
+                // Ok, this is truly weird, but if a panel with a wxChoice
+                // loses the focus, then you get a *fake* WM_LBUTTONUP message
+                // with x = 65535 and y = 65535. Filter out this nonsense.
+                //
+                // VZ: I'd like to know how to reproduce this please...
+                if ( x == 65535 && y == 65535 )
+                    return 0;
+            }
+            break;
+
+            // we have to handle both: one for the normal case and the other
+            // for readonly
+        case WM_CTLCOLOREDIT:
+        case WM_CTLCOLORLISTBOX:
+        case WM_CTLCOLORSTATIC:
+            {
+                WXHDC hdc;
+                WXHWND hwnd;
+                UnpackCtlColor(wParam, lParam, &hdc, &hwnd);
+
+                WXHBRUSH hbr = MSWControlColor((WXHDC)hdc, hwnd);
+                if ( hbr )
+                    return (WXLRESULT)hbr;
+                //else: fall through to default window proc
+            }

     }
     }

-  else
-    return FALSE;
+
+    return wxWindow::MSWWindowProc(nMsg, wParam, lParam);

 }
 
 }
 

-void wxChoice::Command(wxCommandEvent & event)
+bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))

 {
 {

-  SetSelection (event.GetInt());
-  ProcessCommand (event);
+    /*
+        The native control provides a great variety in the events it sends in
+        the different selection scenarios (undoubtedly for greater amusement of
+        the programmers using it). Here are the different cases:
+
+        A. Selecting with just the arrows without opening the dropdown:
+            1. CBN_SELENDOK
+            2. CBN_SELCHANGE
+
+        B. Opening dropdown with F4 and selecting with arrows:
+            1. CBN_DROPDOWN
+            2. many CBN_SELCHANGE while changing selection in the list
+            3. CBN_SELENDOK
+            4. CBN_CLOSEUP
+
+        C. Selecting with the mouse:
+            1. CBN_DROPDOWN
+            -- no intermediate CBN_SELCHANGEs --
+            2. CBN_SELENDOK
+            3. CBN_CLOSEUP
+            4. CBN_SELCHANGE
+
+        Admire the different order of messages in all of those cases, it must
+        surely have taken a lot of effort to Microsoft developers to achieve
+        such originality.
+
+        Additionally, notice that CBN_SELENDCANCEL doesn't seem to actually
+        cancel anything, if we get CBN_SELCHANGE before it, as it happens in
+        the case (B), the selection is still accepted. This doesn't make much
+        sense and directly contradicts MSDN documentation but is how the native
+        comboboxes behave and so we do the same thing.
+     */
+    switch ( param )
+    {
+        case CBN_DROPDOWN:
+            // we use this value both because we don't want to track selection
+            // using CB_GETCURSEL while the dropdown is opened and because we
+            // need to reset the selection back to it if it's eventually
+            // cancelled by user
+            m_lastAcceptedSelection = GetCurrentSelection();
+            break;
+
+        case CBN_CLOSEUP:
+            if ( m_pendingSelection != wxID_NONE )
+            {
+                // This can only happen in the case (B), so set the item
+                // selected in the drop down as our real selection.
+                SendSelectionChangedEvent(wxEVT_COMMAND_CHOICE_SELECTED);
+                m_pendingSelection = wxID_NONE;
+            }
+            break;
+
+        case CBN_SELENDOK:
+            // Reset the variables to prevent CBN_CLOSEUP from doing anything,
+            // it's not needed if we do get CBN_SELENDOK.
+            m_lastAcceptedSelection =
+            m_pendingSelection = wxID_NONE;
+
+            SendSelectionChangedEvent(wxEVT_COMMAND_CHOICE_SELECTED);
+            break;
+
+        case CBN_SELCHANGE:
+            // If we get this event after CBN_SELENDOK, i.e. cases (A) or (C)
+            // above, we don't have anything to do. But in the case (B) we need
+            // to remember that the selection should really change once the
+            // drop down is closed.
+            if ( m_lastAcceptedSelection != wxID_NONE )
+                m_pendingSelection = GetCurrentSelection();
+            break;
+
+        case CBN_SELENDCANCEL:
+            // Do not reset m_pendingSelection here -- it would make sense but,
+            // as described above, native controls keep the selection even when
+            // closing the drop down by pressing Escape or TAB, so conform to
+            // their behaviour.
+            m_lastAcceptedSelection = wxID_NONE;
+            break;
+
+        default:
+            return false;
+    }
+
+    return true;

 }
 
 }
 

+WXHBRUSH wxChoice::MSWControlColor(WXHDC hDC, WXHWND hWnd)
+{
+    if ( !IsThisEnabled() )
+        return MSWControlColorDisabled(hDC);

 
 

+    return wxChoiceBase::MSWControlColor(hDC, hWnd);
+}

 
 

+#endif // wxUSE_CHOICE && !(__SMARTPHONE__ && __WXWINCE__)