cc/layers/scrollbar_layer_impl_base.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 CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
   6 #define CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
   7
   8 #include "cc/base/cc_export.h"
   9 #include "cc/input/scrollbar.h"
  10 #include "cc/layers/layer_impl.h"
  11
  12 namespace cc {
  13
  14 class LayerTreeImpl;
  15
  16 class CC_EXPORT ScrollbarLayerImplBase : public LayerImpl {
  17  public:
  18   int ScrollLayerId() const { return scroll_layer_id_; }
  19   void set_scroll_layer_id(int id) { scroll_layer_id_ = id; }
  20
  21   float current_pos() const { return current_pos_; }
  22   void SetCurrentPos(float current_pos);
  23   int maximum() const { return maximum_; }
  24   void SetMaximum(int maximum);
  25
  26   void SetVerticalAdjust(float vertical_adjust);
  27
  28   bool is_overlay_scrollbar() const { return is_overlay_scrollbar_; }
  29   void set_is_overlay_scrollbar(bool is_overlay) {
  30     is_overlay_scrollbar_ = is_overlay;
  31   }
  32
  33   ScrollbarOrientation orientation() const { return orientation_; }
  34   bool is_left_side_vertical_scrollbar() {
  35     return is_left_side_vertical_scrollbar_;
  36   }
  37
  38   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
  39   virtual ScrollbarLayerImplBase* ToScrollbarLayer() OVERRIDE;
  40
  41   void SetVisibleToTotalLengthRatio(float ratio);
  42   virtual gfx::Rect ComputeThumbQuadRect() const;
  43
  44   float thumb_thickness_scale_factor() {
  45     return thumb_thickness_scale_factor_;
  46   }
  47   void SetThumbThicknessScaleFactor(float thumb_thickness_scale_factor);
  48
  49  protected:
  50   ScrollbarLayerImplBase(LayerTreeImpl* tree_impl,
  51                          int id,
  52                          ScrollbarOrientation orientation,
  53                          bool is_left_side_vertical_scrollbar);
  54   virtual ~ScrollbarLayerImplBase() {}
  55
  56   gfx::Rect ScrollbarLayerRectToContentRect(const gfx::RectF& layer_rect) const;
  57
  58   float visible_to_total_length_ratio() const {
  59     return visible_to_total_length_ratio_;
  60   }
  61   float vertical_adjust() const { return vertical_adjust_; }
  62
  63   virtual int ThumbThickness() const = 0;
  64   virtual int ThumbLength() const = 0;
  65   virtual float TrackLength() const = 0;
  66   virtual int TrackStart() const = 0;
  67   // Indicates whether the thumb length can be changed without going back to the
  68   // main thread.
  69   virtual bool IsThumbResizable() const = 0;
  70
  71  private:
  72   int scroll_layer_id_;
  73   bool is_overlay_scrollbar_;
  74
  75   float thumb_thickness_scale_factor_;
  76   float current_pos_;
  77   int maximum_;
  78   ScrollbarOrientation orientation_;
  79   bool is_left_side_vertical_scrollbar_;
  80
  81   // Difference between the clip layer's height and the visible viewport
  82   // height (which may differ in the presence of top-controls hiding).
  83   float vertical_adjust_;
  84
  85   float visible_to_total_length_ratio_;
  86
  87   DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerImplBase);
  88 };
  89
  90 }  // namespace cc
  91
  92 #endif  // CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_