| // Copyright 2014 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 THIRD_PARTY_BLINK_RENDERER_CORE_SCROLL_SCROLLBAR_LAYER_DELEGATE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_SCROLL_SCROLLBAR_LAYER_DELEGATE_H_ |
| |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "cc/input/scrollbar.h" |
| #include "cc/paint/paint_canvas.h" |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/platform/heap/persistent.h" |
| |
| namespace cc { |
| class PaintCanvas; |
| } |
| |
| namespace blink { |
| |
| class Scrollbar; |
| class ScrollbarTheme; |
| |
| // Implementation of cc::Scrollbar, providing a delegate to query about |
| // scrollbar state and to paint the image in the scrollbar. |
| class CORE_EXPORT ScrollbarLayerDelegate : public cc::Scrollbar { |
| public: |
| ScrollbarLayerDelegate(blink::Scrollbar& scrollbar, |
| float device_scale_factor); |
| ~ScrollbarLayerDelegate() override; |
| |
| // cc::Scrollbar implementation. |
| cc::ScrollbarOrientation Orientation() const override; |
| bool IsLeftSideVerticalScrollbar() const override; |
| bool HasThumb() const override; |
| bool IsOverlay() const override; |
| gfx::Point Location() const override; |
| int ThumbThickness() const override; |
| int ThumbLength() const override; |
| gfx::Rect TrackRect() const override; |
| float ThumbOpacity() const override; |
| bool NeedsPaintPart(cc::ScrollbarPart part) const override; |
| bool HasTickmarks() const override; |
| void PaintPart(cc::PaintCanvas* canvas, |
| cc::ScrollbarPart part, |
| const gfx::Rect& content_rect) override; |
| |
| bool UsesNinePatchThumbResource() const override; |
| gfx::Size NinePatchThumbCanvasSize() const override; |
| gfx::Rect NinePatchThumbAperture() const override; |
| |
| private: |
| // Accessed by main and compositor threads, e.g., the compositor thread |
| // checks |Orientation()|. |
| CrossThreadPersistent<blink::Scrollbar> scrollbar_; |
| |
| ScrollbarTheme& theme_; |
| float device_scale_factor_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerDelegate); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_SCROLL_SCROLLBAR_LAYER_DELEGATE_H_ |