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// 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 "base/macros.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 SetScrollLayerId(int scroll_layer_id);
float current_pos() const { return current_pos_; }
bool SetCurrentPos(float current_pos);
bool SetClipLayerLength(float clip_layer_length);
bool SetScrollLayerLength(float scroll_layer_length);
bool SetVerticalAdjust(float vertical_adjust);
float clip_layer_length() const { return clip_layer_length_; }
float scroll_layer_length() const { return scroll_layer_length_; }
float vertical_adjust() const { return 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_;
}
bool CanScrollOrientation() const;
void PushPropertiesTo(LayerImpl* layer) override;
void DidBecomeActive() override;
ScrollbarLayerImplBase* ToScrollbarLayer() override;
// Thumb quad rect in layer space.
virtual gfx::Rect ComputeThumbQuadRect() const;
float thumb_thickness_scale_factor() {
return thumb_thickness_scale_factor_;
}
bool SetThumbThicknessScaleFactor(float thumb_thickness_scale_factor);
protected:
ScrollbarLayerImplBase(LayerTreeImpl* tree_impl,
int id,
ScrollbarOrientation orientation,
bool is_left_side_vertical_scrollbar,
bool is_overlay);
~ScrollbarLayerImplBase() override;
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_;
bool is_overlay_scrollbar_;
float thumb_thickness_scale_factor_;
float current_pos_;
float clip_layer_length_;
float scroll_layer_length_;
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_;
DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerImplBase);
};
typedef std::set<ScrollbarLayerImplBase*> ScrollbarSet;
} // namespace cc
#endif // CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
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