Prevent accession of to-be-deleted mdi

child window.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42403 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/mdi.h

@@ -150,6 +150,8 @@ public:
 
     virtual bool IsTopLevel() const { return false; }
 
+    virtual bool Destroy();
+
     void OnActivate( wxActivateEvent& event );
     void OnMenuHighlight( wxMenuEvent& event );
 

src/gtk/mdi.cpp

@@ -257,12 +257,17 @@ wxMDIChildFrame *wxMDIParentFrame::GetActiveChild() const
     wxWindowList::compatibility_iterator node = m_clientWindow->GetChildren().GetFirst();
     while (node)
     {
+        if ( wxPendingDelete.Member(node->GetData()) )
+            return (wxMDIChildFrame*) NULL;
+        
         wxMDIChildFrame *child_frame = wxDynamicCast( node->GetData(), wxMDIChildFrame );
 
-        wxASSERT_MSG( child_frame, _T("child is not a wxMDIChildFrame") );
+        if (!child_frame)
+            return (wxMDIChildFrame*) NULL;
 
         if (child_frame->m_page == page)
             return child_frame;
+            
         node = node->GetNext();
     }
 
@@ -335,6 +340,19 @@ bool wxMDIChildFrame::Create( wxMDIParentFrame *parent,
     return wxWindow::Create( parent->GetClientWindow(), id, wxDefaultPosition, size, style, name );
 }
 
+bool wxMDIChildFrame::Destroy()
+{
+    // delayed destruction: the frame will be deleted during
+    // the next idle loop iteration.
+    // I'm not sure if delayed destruction really makes so
+    // much sense for MDI child frames, actually, but hiding
+    // it doesn't make any sense.
+    if ( !wxPendingDelete.Member(this) )
+        wxPendingDelete.Append(this);
+
+    return true;
+}
+
 void wxMDIChildFrame::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 {
     wxWindow::DoSetSize( x, y, width, height, sizeFlags );