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 virtual ~ShadowLayerDelegate(); 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. layer()31 ui::Layer* layer() { return layer_.get(); } 32 33 private: 34 // Overridden from ui::LayerDelegate: 35 virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE; 36 virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE; 37 virtual base::Closure PrepareForLayerBoundsChange() OVERRIDE; 38 39 scoped_ptr<ui::Layer> layer_; 40 41 DISALLOW_COPY_AND_ASSIGN(ShadowLayerDelegate); 42 }; 43 44 } // namespace content 45 46 #endif // CONTENT_BROWSER_WEB_CONTENTS_AURA_SHADOW_LAYER_DELEGATE_H_ 47