chrome/browser/chromeos/ui/focus_ring_layer.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 CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_
   6 #define CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "ui/compositor/layer_delegate.h"
  11 #include "ui/gfx/rect.h"
  12
  13 namespace aura {
  14 class Window;
  15 }
  16
  17 namespace ui {
  18 class Layer;
  19 }
  20
  21 namespace views {
  22 class View;
  23 }
  24
  25 namespace chromeos {
  26
  27 // FocusRingLayer draws a focus ring for a given view.
  28 class FocusRingLayer : public ui::LayerDelegate {
  29  public:
  30   FocusRingLayer();
  31   virtual ~FocusRingLayer();
  32
  33   // Create the layer and update its bounds and position in the hierarchy.
  34   void Update();
  35
  36   // Updates the focus ring layer for the view or clears it if |view| is NULL.
  37   void SetForView(views::View* view);
  38
  39  private:
  40   // ui::LayerDelegate overrides:
  41   virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE;
  42   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
  43   virtual base::Closure PrepareForLayerBoundsChange() OVERRIDE;
  44
  45   // The window containing focus.
  46   aura::Window* window_;
  47
  48   // The current root window containing the focused object.
  49   aura::Window* root_window_;
  50
  51   // The bounding rectangle of the focused object, in |window_| coordinates.
  52   gfx::Rect focus_ring_;
  53
  54   // The current layer.
  55   scoped_ptr<ui::Layer> layer_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(FocusRingLayer);
  58 };
  59
  60 }  // namespace chromeos
  61
  62 #endif  // CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_