fixes to Freeze/Thawn when the window is shown or hidden in between Freeze and Thaw

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52688 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/window.cpp

@@ -4311,15 +4311,67 @@ GdkWindow* wxWindowGTK::GTKGetDrawingWindow() const
 // freeze/thaw
 // ----------------------------------------------------------------------------
 
+extern "C"
+{
+
+// this is called if we attempted to freeze unrealized widget when it finally
+// is realized (and so can be frozen):
+static void wx_frozen_widget_realize(GtkWidget* w, void* WXUNUSED(data))
+{
+    wxASSERT( w && !GTK_WIDGET_NO_WINDOW(w) );
+    wxASSERT( GTK_WIDGET_REALIZED(w) );
+
+    g_signal_handlers_disconnect_by_func
+    (
+        w,
+        (void*)wx_frozen_widget_realize,
+        NULL
+    );
+
+    gdk_window_freeze_updates(w->window);
+}
+
+} // extern "C"
+
 void wxWindowGTK::GTKFreezeWidget(GtkWidget *w)
 {
-    if ( w && !GTK_WIDGET_NO_WINDOW(w) )
+    if ( !w || GTK_WIDGET_NO_WINDOW(w) )
+        return; // window-less widget, cannot be frozen
+
+    if ( !GTK_WIDGET_REALIZED(w) )
+    {
+        // we can't thaw unrealized widgets because they don't have GdkWindow,
+        // so set it up to be done immediately after realization:
+        g_signal_connect_after
+        (
+            w,
+            "realize",
+            G_CALLBACK(wx_frozen_widget_realize),
+            NULL
+        );
+        return;
+    }
+
     gdk_window_freeze_updates(w->window);
 }
 
 void wxWindowGTK::GTKThawWidget(GtkWidget *w)
 {
-    if ( w && !GTK_WIDGET_NO_WINDOW(w) )
+    if ( !w || GTK_WIDGET_NO_WINDOW(w) )
+        return; // window-less widget, cannot be frozen
+
+    if ( !GTK_WIDGET_REALIZED(w) )
+    {
+        // the widget wasn't realized yet, no need to thaw
+        g_signal_handlers_disconnect_by_func
+        (
+            w,
+            (void*)wx_frozen_widget_realize,
+            NULL
+        );
+        return;
+    }
+
     gdk_window_thaw_updates(w->window);
 }
 

src/msw/window.cpp

@@ -716,6 +716,16 @@ bool wxWindowMSW::Show(bool show)
         ::ShowWindow(hWnd, show ? SW_SHOW : SW_HIDE);
     }
 
+    if ( IsFrozen() )
+    {
+        // DoFreeze/DoThaw don't do anything if the window is not shown, so
+        // we have to call them from here now
+        if ( show )
+            DoFreeze();
+        else
+            DoThaw();
+    }
+
     return true;
 }
 
@@ -1615,20 +1625,22 @@ static inline void SendSetRedraw(HWND hwnd, bool on)
 
 void wxWindowMSW::DoFreeze()
 {
-    if ( IsShown() )
+    if ( !IsShown() )
+        return; // no point in freezing hidden window
+
     SendSetRedraw(GetHwnd(), false);
 }
 
 void wxWindowMSW::DoThaw()
 {
-    if ( IsShown() )
+    if ( !IsShown() )
-    {
+        return; // hidden windows aren't frozen by DoFreeze
+
     SendSetRedraw(GetHwnd(), true);
 
     // we need to refresh everything or otherwise the invalidated area
     // is not going to be repainted
     Refresh();
-    }
 }
 
 void wxWindowMSW::Refresh(bool eraseBack, const wxRect *rect)