Use ListView_CancelEditLabel() to implement wxListCtrl::EndEditLabel().

Windows XP and later finally added a special message to cancel label editing,
use it if available.

Also improve the documentation of this method.

See #7663.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64374 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/listctrl.h

@@ -252,7 +252,13 @@ public:
 
         This method allows to programmatically end editing a list control item
         in place. Usually it will only be called when editing is in progress,
-        i.e. if GetEditControl() returns non-NULL.
+        i.e. if GetEditControl() returns non-NULL. In particular, do not call
+        it from EVT_LIST_BEGIN_LABEL_EDIT handler as the edit control is not
+        yet fully created by then, just veto the event in this handler instead
+        to prevent the editing from even starting.
+
+        Notice that calling this method will result in EVT_LIST_END_LABEL_EDIT
+        event being generated.
 
         Currently only implemented in wxMSW.
 

src/msw/listctrl.cpp

@@ -1561,10 +1561,21 @@ bool wxListCtrl::EndEditLabel(bool cancel)
     if ( !hwnd )
         return false;
 
+    // Newer versions of Windows have a special message for cancelling editing,
+    // use it if available.
+#ifdef ListView_CancelEditLabel
+    if ( cancel && (wxApp::GetComCtl32Version() >= 600) )
+    {
+        ListView_CancelEditLabel(GetHwnd());
+    }
+    else
+#endif // ListView_CancelEditLabel
+    {
         // We shouldn't destroy the control ourselves according to MSDN, which
         // proposes WM_CANCELMODE to do this, but it doesn't seem to work so
         // emulate the corresponding user action instead.
         ::SendMessage(hwnd, WM_KEYDOWN, cancel ? VK_ESCAPE : VK_RETURN, 0);
+    }
 
     return true;
 }