Prevent surplus calls of _size_allocate() if no change

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

diff --git a/src/msw/treectrl.cpp b/src/msw/treectrl.cpp
index 46a215d3ba926a1b0d201a76defeada6b7fcb49d..d358be2f328155f21f264b872c8c273e5c7f47da 100644 (file)
--- a/src/msw/treectrl.cpp
+++ b/src/msw/treectrl.cpp
@@ -1213,6 +1213,12 @@ bool wxTreeCtrl::ItemHasChildren(const wxTreeItemId& item) const
 {
     wxCHECK_MSG( item.IsOk(), false, wxT("invalid tree item") );
 
 {
     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);
 
     wxTreeViewItem tvItem(item, TVIF_CHILDREN);
     DoGetItem(&tvItem);
 


@@ -2858,11 +2864,12 @@ bool wxTreeCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
     switch ( hdr->code )
     {
         case NM_DBLCLK:
     switch ( hdr->code )
     {
         case NM_DBLCLK:

-            // we translate NM_DBLCLK into ACTIVATED event, so don't interpret
-            // the return code of this event handler as the return value for
-            // NM_DBLCLK - otherwise, double clicking the item to toggle its
-            // expanded status would never work
-            *result = false;
+            // 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:
             break;
 
         case NM_RCLICK: