Implement SetShape() for wxPopupWindow in wxGTK.

Move SetShape() implementation from wxTopLevelWindow to wxNonOwnedWindow so
that wxPopupWindow, which also inherits from the latter, could use it as well.

This makes it possible to have popup windows with irregular shapes in wxGTK as
well as in wxMSW and wxOSX.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69408 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/nonownedwnd.cpp

@@ -0,0 +1,91 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        src/gtk/nonownedwnd.cpp
+// Purpose:     wxGTK implementation of wxNonOwnedWindow.
+// Author:      Vadim Zeitlin
+// Created:     2011-10-12
+// RCS-ID:      $Id: wxhead.cpp,v 1.11 2010-04-22 12:44:51 zeitlin Exp $
+// Copyright:   (c) 2011 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// for compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#ifndef WX_PRECOMP
+    #include "wx/string.h"
+#endif // WX_PRECOMP
+
+#include "wx/gtk/private.h"
+
+#include <gdk/gdk.h>
+
+namespace
+{
+
+// helper
+bool do_shape_combine_region(GdkWindow* window, const wxRegion& region)
+{
+    if (window)
+    {
+        if (region.IsEmpty())
+        {
+            gdk_window_shape_combine_mask(window, NULL, 0, 0);
+        }
+        else
+        {
+            gdk_window_shape_combine_region(window, region.GetRegion(), 0, 0);
+            return true;
+        }
+    }
+    return false;
+}
+
+} // anonymous namespace
+
+
+// ============================================================================
+// wxNonOwnedWindow implementation
+// ============================================================================
+
+void wxNonOwnedWindow::GTKHandleRealized()
+{
+    wxNonOwnedWindowBase::GTKHandleRealized();
+
+    if (HasFlag(wxFRAME_SHAPED))
+        SetShape(m_shape);
+}
+
+bool wxNonOwnedWindow::SetShape(const wxRegion& region)
+{
+    wxCHECK_MSG( HasFlag(wxFRAME_SHAPED), false,
+                 wxT("Shaped windows must be created with the wxFRAME_SHAPED style."));
+
+    if ( gtk_widget_get_realized(m_widget) )
+    {
+        if ( m_wxwindow )
+            do_shape_combine_region(gtk_widget_get_window(m_wxwindow), region);
+
+        return do_shape_combine_region(gtk_widget_get_window(m_widget), region);
+    }
+    else // not realized yet
+    {
+        // store the shape to set, it will be really set once we're realized
+        m_shape = region;
+
+        // we don't know if we're going to succeed or fail, be optimistic by
+        // default
+        return true;
+    }
+}