chrome/browser/ui/gtk/tabstrip_origin_provider.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_UI_GTK_TABSTRIP_ORIGIN_PROVIDER_H_
   6 #define CHROME_BROWSER_UI_GTK_TABSTRIP_ORIGIN_PROVIDER_H_
   7
   8 namespace gfx{
   9 class Point;
  10 }
  11
  12 // Abstract interface that provides an offset of a widget. Many pieces of the
  13 // UI don't need the full BrowserWindowGtk, but just need information about
  14 // its position relative to the tabstrip to draw correctly. This interface
  15 // exists to make it easier to test piece by piece.
  16 class TabstripOriginProvider {
  17  public:
  18   virtual ~TabstripOriginProvider() { }
  19
  20   // Return the origin of the tab strip in coordinates relative to where we
  21   // start drawing the background theme image. This is the x coordinate of
  22   // the origin of the GdkWindow of widget(), but the y coordinate of the origin
  23   // of widget() itself.
  24   // Used to help other widgets draw their background relative to the tabstrip.
  25   // Should only be called after both the tabstrip and |widget| have been
  26   // allocated.
  27   virtual gfx::Point GetTabStripOriginForWidget(GtkWidget* widget) = 0;
  28 };
  29
  30 #endif  // CHROME_BROWSER_UI_GTK_TABSTRIP_ORIGIN_PROVIDER_H_