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// Copyright 2017 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_PLATFORM_GRAPHICS_PAINT_SCROLL_HIT_TEST_DISPLAY_ITEM_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_PAINT_SCROLL_HIT_TEST_DISPLAY_ITEM_H_
#include "base/memory/ref_counted.h"
#include "third_party/blink/renderer/platform/graphics/paint/display_item.h"
#include "third_party/blink/renderer/platform/graphics/paint/transform_paint_property_node.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace blink {
class GraphicsContext;
// Placeholder display item for creating a special cc::Layer marked as being
// scrollable in PaintArtifactCompositor. A display item is needed because
// scroll hit testing must be in paint order.
//
// The scroll hit test display item keeps track of the scroll offset translation
// node which also has a reference to the associated scroll node. The scroll hit
// test display item should be in the non-scrolled transform space and therefore
// should not be scrolled by the associated scroll offset transform.
class PLATFORM_EXPORT ScrollHitTestDisplayItem final : public DisplayItem {
public:
ScrollHitTestDisplayItem(
const DisplayItemClient&,
const TransformPaintPropertyNode& scroll_offset_node);
~ScrollHitTestDisplayItem() override;
const TransformPaintPropertyNode& scroll_offset_node() const {
return scroll_offset_node_;
}
// DisplayItem
void Replay(GraphicsContext&) const override;
void AppendToDisplayItemList(const FloatSize&,
cc::DisplayItemList&) const override;
bool Equals(const DisplayItem&) const override;
#if DCHECK_IS_ON()
void PropertiesAsJSON(JSONObject&) const override;
#endif
// Create and append a ScrollHitTestDisplayItem onto the context. This is
// similar to a recorder class (e.g., DrawingRecorder) but just emits a single
// item.
static void Record(GraphicsContext&,
const DisplayItemClient&,
const TransformPaintPropertyNode& scroll_offset_node);
private:
const ScrollPaintPropertyNode& scroll_node() const {
return *scroll_offset_node_.ScrollNode();
}
const TransformPaintPropertyNode& scroll_offset_node_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_PAINT_SCROLL_HIT_TEST_DISPLAY_ITEM_H_
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