Add comments explaining the workaround for mingw 3.2.3

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

diff --git a/src/msw/combobox.cpp b/src/msw/combobox.cpp
index 94ded90fd17c32bbfdfb91eb0cd3814421c742e5..c15da2ee31ba9e918c050c277e1374e262c972c8 100644 (file)
--- a/src/msw/combobox.cpp
+++ b/src/msw/combobox.cpp
@@ -174,6 +174,9 @@ LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
         case WM_KEYUP:
         case WM_KEYDOWN:
         case WM_CHAR:
+        case WM_SYSCHAR:
+        case WM_SYSKEYDOWN:
+        case WM_SYSKEYUP:
         case WM_SETFOCUS:
         case WM_KILLFOCUS:
             {
@@ -241,18 +244,38 @@ LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 
 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 {
-    // handle WM_CTLCOLOR messages from our EDIT control to be able to set its
-    // colour correctly (to be the same as our own one)
+    // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
+    //       set its colour correctly (to be the same as our own one)
+
     switch ( nMsg )
     {
         case CB_SETCURSEL:
             // Selection was set with SetSelection.  Update the value too.
             if ((int)wParam > GetCount())
-                m_value = wxEmptyString;
+                m_value.clear();
             else
                 m_value = GetString(wParam);
             m_selectionOld = -1;
             break;
+
+        case WM_SIZE:
+            {
+                // combobox selection sometimes spontaneously changes when its
+                // size changes, restore it to the old value if necessary
+                long fromOld, toOld;
+                GetSelection(&fromOld, &toOld);
+                WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
+
+                long fromNew, toNew;
+                GetSelection(&fromNew, &toNew);
+
+                if ( fromOld != fromNew || toOld != toNew )
+                {
+                    SetSelection(fromOld, toOld);
+                }
+
+                return result;
+            }
     }
 
     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
@@ -279,12 +302,16 @@ bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
                     return true;
                 }
             }
+            // fall through
 
+        case WM_SYSCHAR:
             return HandleChar(wParam, lParam, true /* isASCII */);
 
+        case WM_SYSKEYDOWN:
         case WM_KEYDOWN:
             return HandleKeyDown(wParam, lParam);
 
+        case WM_SYSKEYUP:
         case WM_KEYUP:
             return HandleKeyUp(wParam, lParam);
 
@@ -304,11 +331,13 @@ bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
     int sel = -1;
     switch ( param )
     {
+        case CBN_SELENDOK:
         case CBN_SELCHANGE:
             sel = GetSelection();
 
-            // somehow we get 2 CBN_SELCHANGE events with the same index when
-            // the user selects an item in the combobox -- ignore duplicates
+            // we may sometimes get 2 CBN_SELCHANGE events or a CBN_SELENDOK
+            // before CBN_SELCHANGE with the same index when the user selects
+            // an item in the combobox -- ignore duplicates
             if ( sel > -1 && sel != m_selectionOld )
             {
                 m_selectionOld = sel;
@@ -456,6 +485,11 @@ WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
                       );
 
+    // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
+    // created hidden (see Create() above), it is not done for us but we still
+    // want to have this style
+    msStyle |= WS_TABSTOP;
+
     // remove the style always added by wxChoice
     msStyle &= ~CBS_DROPDOWNLIST;
 
@@ -535,6 +569,9 @@ void wxComboBox::SelectAll()
 
 bool wxComboBox::CanUndo() const
 {
+    if (!IsEditable())
+        return false;
+    
     HWND hEditWnd = (HWND) GetEditHWND() ;
     if ( hEditWnd )
         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
@@ -544,6 +581,9 @@ bool wxComboBox::CanUndo() const
 
 bool wxComboBox::CanRedo() const
 {
+    if (!IsEditable())
+        return false;
+    
     HWND hEditWnd = (HWND) GetEditHWND() ;
     if ( hEditWnd )
         return ::SendMessage(hEditWnd, EM_CANUNDO, 0, 0) != 0;
@@ -566,7 +606,7 @@ bool wxComboBox::CanCopy() const
 
 bool wxComboBox::CanCut() const
 {
-    return CanCopy() && IsEditable();
+    return IsEditable() && CanCopy() ;
 }
 
 bool wxComboBox::CanPaste() const
@@ -620,30 +660,29 @@ void wxComboBox::SetInsertionPointEnd()
     // setting insertion point doesn't make sense for read only comboboxes
     if ( !(GetWindowStyle() & wxCB_READONLY) )
     {
-        long pos = GetLastPosition();
+        wxTextPos pos = GetLastPosition();
         SetInsertionPoint(pos);
     }
 }
 
 long wxComboBox::GetInsertionPoint() const
 {
-#ifdef __WIN32__
-    DWORD Pos=(DWORD)SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
-    return Pos&0xFFFF;
-#else
-    return 0;
-#endif
+    // CB_GETEDITSEL returns the index of the last character after selection in
+    // its high-order word
+    DWORD pos= (DWORD)::SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
+
+    return HIWORD(pos);
 }
 
-long wxComboBox::GetLastPosition() const
+wxTextPos wxComboBox::GetLastPosition() const
 {
     HWND hEditWnd = (HWND) GetEditHWND();
 
     // Get number of characters in the last (only) line. We'll add this to the character
     // index for the last line, 1st position.
-    int lineLength = (int)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
+    wxTextPos lineLength = (wxTextPos)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 
-    return (long)(lineLength);
+    return lineLength;
 }
 
 void wxComboBox::Replace(long from, long to, const wxString& value)
@@ -668,19 +707,15 @@ void wxComboBox::Remove(long from, long to)
 
 void wxComboBox::SetSelection(long from, long to)
 {
-    HWND hWnd = GetHwnd();
-    long fromChar = from;
-    long toChar = to;
-    // if from and to are both -1, it means
-    // (in wxWidgets) that all text should be selected.
-    // This translates into Windows convention
-    if ((from == -1) && (to == -1))
+    // if from and to are both -1, it means (in wxWidgets) that all text should
+    // be selected, translate this into Windows convention
+    if ( (from == -1) && (to == -1) )
     {
-      fromChar = 0;
-      toChar = -1;
+        from = 0;
     }
 
-    if ( SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar)) == CB_ERR )
+    if ( SendMessage(GetHwnd(), CB_SETEDITSEL,
+                     0, (LPARAM)MAKELONG(from, to)) == CB_ERR )
     {
         wxLogDebug(_T("CB_SETEDITSEL failed"));
     }
@@ -689,10 +724,17 @@ void wxComboBox::SetSelection(long from, long to)
 void wxComboBox::GetSelection(long* from, long* to) const
 {
     DWORD dwStart, dwEnd;
-    ::SendMessage(GetHwnd(), CB_GETEDITSEL, (WPARAM)&dwStart, (LPARAM)&dwEnd);
-
-    *from = dwStart;
-    *to = dwEnd;
+    if ( ::SendMessage(GetHwnd(), CB_GETEDITSEL,
+                       (WPARAM)&dwStart, (LPARAM)&dwEnd) == CB_ERR )
+    {
+        *from =
+        *to = 0;
+    }
+    else
+    {
+        *from = dwStart;
+        *to = dwEnd;
+    }
 }
 
 int wxComboBox::GetSelection() const