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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 "cc/base/cc_export.h"
#include "cc/input/scrollbar.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; }
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_; }
virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
virtual ScrollbarLayerImplBase* ToScrollbarLayer() OVERRIDE;
void SetVisibleToTotalLengthRatio(float ratio);
virtual gfx::Rect ComputeThumbQuadRect() const;
protected:
ScrollbarLayerImplBase(LayerTreeImpl* tree_impl,
int id,
ScrollbarOrientation orientation);
virtual ~ScrollbarLayerImplBase() {}
gfx::Rect ScrollbarLayerRectToContentRect(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;
private:
int scroll_layer_id_;
bool is_overlay_scrollbar_;
float current_pos_;
int maximum_;
ScrollbarOrientation orientation_;
// 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_
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