ash/frame/header_painter.h

   1 // Copyright 2013 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 ASH_FRAME_HEADER_PAINTER_H_
   6 #define ASH_FRAME_HEADER_PAINTER_H_
   7
   8 #include "ash/ash_export.h"
   9
  10 namespace gfx {
  11 class Canvas;
  12 }
  13
  14 namespace ash {
  15
  16 // Helper class for painting the window header.
  17 class ASH_EXPORT HeaderPainter {
  18  public:
  19   enum Mode {
  20     MODE_ACTIVE,
  21     MODE_INACTIVE
  22   };
  23
  24   virtual ~HeaderPainter() {
  25   }
  26
  27   // Returns the header's minimum width.
  28   virtual int GetMinimumHeaderWidth() const = 0;
  29
  30   // Paints the header.
  31   virtual void PaintHeader(gfx::Canvas* canvas, Mode mode) = 0;
  32
  33   // Performs layout for the header.
  34   virtual void LayoutHeader() = 0;
  35
  36   // Get the height of the header.
  37   virtual int GetHeaderHeight() const = 0;
  38
  39   // Gets / sets how much of the header is painted. This allows the header to
  40   // paint under things (like the tabstrip) which have transparent /
  41   // non-painting sections. This height does not affect LayoutHeader().
  42   virtual int GetHeaderHeightForPainting() const = 0;
  43   virtual void SetHeaderHeightForPainting(int height_for_painting) = 0;
  44
  45   // Schedule a re-paint of the entire title.
  46   virtual void SchedulePaintForTitle() = 0;
  47
  48   // Updates the x inset of the leftmost view in the header.
  49   virtual void UpdateLeftViewXInset(int left_view_x_inset) = 0;
  50 };
  51
  52 }  // namespace ash
  53
  54 #endif  // ASH_FRAME_HEADER_PAINTER_H_