content/browser/web_contents/aura/shadow_layer_delegate.h

   1 // Copyright (c) 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 CONTENT_BROWSER_WEB_CONTENTS_AURA_SHADOW_LAYER_DELEGATE_H_
   6 #define CONTENT_BROWSER_WEB_CONTENTS_AURA_SHADOW_LAYER_DELEGATE_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "ui/compositor/layer_delegate.h"
  11
  12 namespace aura {
  13 class Window;
  14 }
  15
  16 namespace ui {
  17 class Layer;
  18 }
  19
  20 namespace content {
  21
  22 // ShadowLayerDelegate takes care of drawing a shadow on the left edge of
  23 // another layer.
  24 class ShadowLayerDelegate : public ui::LayerDelegate {
  25  public:
  26   explicit ShadowLayerDelegate(ui::Layer* shadow_for);
  27   ~ShadowLayerDelegate() override;
  28
  29   // Returns the layer for the shadow. Note that the ShadowLayerDelegate owns
  30   // the layer, and the layer is destroyed when the delegate is destroyed.
  31   ui::Layer* layer() { return layer_.get(); }
  32
  33  private:
  34   // Overridden from ui::LayerDelegate:
  35   void OnPaintLayer(const ui::PaintContext& context) override;
  36   void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override;
  37   void OnDeviceScaleFactorChanged(float device_scale_factor) override;
  38   base::Closure PrepareForLayerBoundsChange() override;
  39
  40   scoped_ptr<ui::Layer> layer_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(ShadowLayerDelegate);
  43 };
  44
  45 }  // namespace content
  46
  47 #endif  // CONTENT_BROWSER_WEB_CONTENTS_AURA_SHADOW_LAYER_DELEGATE_H_