Pinch/Zoom Infrastructure & Plumbing CL

cc/layers/scrollbar_layer_impl_base.h

 // Copyright 2013 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_SCROLLBAR_LAYER_IMPL_BASE_H_
 #define CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/input/scrollbar.h"
+#include "cc/layers/layer.h"
 #include "cc/layers/layer_impl.h"
 
 namespace cc {
 
 class LayerTreeImpl;
 
 class CC_EXPORT ScrollbarLayerImplBase : public LayerImpl {
  public:
-  int ScrollLayerId() const { return scroll_layer_id_; }
-  void set_scroll_layer_id(int id) { scroll_layer_id_ = id; }
+  int ScrollLayerId() const {
+    return scroll_layer_ ? scroll_layer_->id() : Layer::INVALID_ID;
+  }
+  void ClearScrollLayer() { scroll_layer_ = NULL; }
+  void SetScrollLayerById(int id);
+  int ClipLayerId() const {
+    return clip_layer_ ? clip_layer_->id() : Layer::INVALID_ID;
+  }
+  void ClearClipLayer() { clip_layer_ = NULL; }
+  void SetClipLayerById(int id);
 
   float current_pos() const { return current_pos_; }
   void SetCurrentPos(float current_pos);
   int maximum() const { return maximum_; }
   void SetMaximum(int maximum);
 
   void SetVerticalAdjust(float vertical_adjust);
 
   bool is_overlay_scrollbar() const { return is_overlay_scrollbar_; }
   void set_is_overlay_scrollbar(bool is_overlay) {
     is_overlay_scrollbar_ = is_overlay;
   }
 
   ScrollbarOrientation orientation() const { return orientation_; }
   bool is_left_side_vertical_scrollbar() {
     return is_left_side_vertical_scrollbar_;
   }
 
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
   virtual ScrollbarLayerImplBase* ToScrollbarLayer() OVERRIDE;
+  void PushScrollClipPropertiesTo(LayerImpl* layer);
 
   void SetVisibleToTotalLengthRatio(float ratio);
   virtual gfx::Rect ComputeThumbQuadRect() const;
 
   float thumb_thickness_scale_factor() {
     return thumb_thickness_scale_factor_;
   }
   void SetThumbThicknessScaleFactor(float thumb_thickness_scale_factor);
 
+  void ScrollbarParametersDidChange();
+
  protected:
   ScrollbarLayerImplBase(LayerTreeImpl* tree_impl,
                          int id,
                          ScrollbarOrientation orientation,
-                         bool is_left_side_vertical_scrollbar);
-  virtual ~ScrollbarLayerImplBase() {}
+                         bool is_left_side_vertical_scrollbar,
+                         bool is_overlay);
+  virtual ~ScrollbarLayerImplBase();
 
   gfx::Rect ScrollbarLayerRectToContentRect(const gfx::RectF& layer_rect) const;
 
   float visible_to_total_length_ratio() const {
     return visible_to_total_length_ratio_;
   }
   float vertical_adjust() const { return vertical_adjust_; }
 
   virtual int ThumbThickness() const = 0;
   virtual int ThumbLength() const = 0;
   virtual float TrackLength() const = 0;
   virtual int TrackStart() const = 0;
   // Indicates whether the thumb length can be changed without going back to the
   // main thread.
   virtual bool IsThumbResizable() const = 0;
 
  private:
-  int scroll_layer_id_;
+  LayerImpl* scroll_layer_;
+  LayerImpl* clip_layer_;
   bool is_overlay_scrollbar_;
 
   float thumb_thickness_scale_factor_;
   float current_pos_;
   int maximum_;
   ScrollbarOrientation orientation_;
   bool is_left_side_vertical_scrollbar_;
 
   // Difference between the clip layer's height and the visible viewport
   // height (which may differ in the presence of top-controls hiding).
   float vertical_adjust_;
 
   float visible_to_total_length_ratio_;
 
   DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerImplBase);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_