UI Resource Manager

cc/layers/picture_scrollbar_layer.h

+// Copyright 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_LAYERS_PICTURE_SCROLLBAR_LAYER_H_
+#define CC_LAYERS_PICTURE_SCROLLBAR_LAYER_H_
+
+#include "cc/base/cc_export.h"
+#include "cc/input/scrollbar.h"
+#include "cc/layers/contents_scaling_layer.h"
+#include "cc/layers/scrollbar_theme_painter.h"
+#include "cc/resources/layer_updater.h"
+#include "cc/resources/ui_resource_manager.h"
+
+namespace cc {
+class ResourceUpdateQueue;
+class ScrollbarThemeComposite;
+
+class CC_EXPORT ScrollbarLayer : public ContentsScalingLayer,
+  public UIResourceManagerClient {
+ public:
+  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
+      OVERRIDE;
+
+  static scoped_refptr<ScrollbarLayer> Create(
+      scoped_ptr<Scrollbar> scrollbar,
+      int scroll_layer_id);
+
+  int scroll_layer_id() const { return scroll_layer_id_; }
+  void SetScrollLayerId(int id);
+
+  virtual bool OpacityCanAnimateOnImplThread() const OVERRIDE;
+
+  ScrollbarOrientation Orientation() const;
+
+  // Layer interface
+  virtual void Update(ResourceUpdateQueue* queue,
+                      const OcclusionTracker* occlusion) OVERRIDE;
+  virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
+  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
+  virtual void CalculateContentsScale(float ideal_contents_scale,
+                                      float device_scale_factor,
+                                      float page_scale_factor,
+                                      bool animating_transform_to_screen,
+                                      float* contents_scale_x,
+                                      float* contents_scale_y,
+                                      gfx::Size* content_bounds) OVERRIDE;
+
+  virtual ScrollbarLayer* ToScrollbarLayer() OVERRIDE;
+
+  virtual void UIResourceReady(UIResourceId id) OVERRIDE;
+  virtual void UIResourceLost(UIResourceId id) OVERRIDE;
+
+ protected:
+  ScrollbarLayer(scoped_ptr<Scrollbar> scrollbar,
+                 int scroll_layer_id);
+  virtual ~ScrollbarLayer();
+
+ private:
+  gfx::Rect ScrollbarLayerRectToContentRect(gfx::Rect layer_rect) const;
+  gfx::Rect OriginThumbRect() const;
+
+  bool is_dirty() const { return !dirty_rect_.IsEmpty(); }
+
+  int MaxTextureSize();
+  float ClampScaleToMaxTextureSize(float scale);
+
+  scoped_ptr<Scrollbar> scrollbar_;
+
+  int thumb_thickness_;
+  int thumb_length_;
+  gfx::Rect track_rect_;
+  int scroll_layer_id_;
+
+  gfx::RectF dirty_rect_;
+
+  UIResourceId track_ui_resource_id_;
+  UIResourceId thumb_ui_resource_id_;
+  UIResourceStatus track_ui_resource_status_;
+  UIResourceStatus thumb_ui_resource_status_;
+  scoped_refptr<UIResourceBitmap> track_bitmap_;
+  scoped_refptr<UIResourceBitmap> thumb_bitmap_;
+  bool skip_update_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScrollbarLayer);
+};
+
+
+}  // namespace cc
+
+#endif  // CC_LAYERS_PICTURE_SCROLLBAR_LAYER_H_