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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_CUSTOM_SCROLLBAR_PART_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_CUSTOM_SCROLLBAR_PART_H_
#include "base/notreached.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/layout/layout_replaced.h"
#include "third_party/blink/renderer/core/scroll/scroll_types.h"
namespace blink {
class CustomScrollbar;
class ScrollableArea;
class CORE_EXPORT LayoutCustomScrollbarPart final : public LayoutReplaced {
public:
static LayoutCustomScrollbarPart* CreateAnonymous(Document*,
ScrollableArea*,
CustomScrollbar* = nullptr,
ScrollbarPart = kNoPart);
void Trace(Visitor*) const override;
const char* GetName() const override {
NOT_DESTROYED();
return "LayoutCustomScrollbarPart";
}
PaintLayerType LayerTypeRequired() const override {
NOT_DESTROYED();
return kNoPaintLayer;
}
// Computes thickness of the scrollbar (which defines thickness of all parts).
// For kScrollbarBGPart only. This can be called during style update.
// Percentage size will be ignored.
int ComputeThickness() const;
// Computes size of the part in the direction of the scrollbar orientation.
// This doesn't apply to kScrollbarBGPart because its length is not determined
// by the style of the part of itself. For kThumbPart this returns the
// minimum length of the thumb. The length may depend on the size of the
// containing box, so this function can only be called after the size is
// available.
int ComputeLength() const;
LayoutUnit MarginTop() const override;
LayoutUnit MarginBottom() const override;
LayoutUnit MarginLeft() const override;
LayoutUnit MarginRight() const override;
bool IsOfType(LayoutObjectType type) const override {
NOT_DESTROYED();
return type == kLayoutObjectCustomScrollbarPart ||
LayoutReplaced::IsOfType(type);
}
ScrollableArea* GetScrollableArea() const {
NOT_DESTROYED();
return scrollable_area_;
}
LayoutCustomScrollbarPart(ScrollableArea*, CustomScrollbar*, ScrollbarPart);
private:
void UpdateFromStyle() override;
void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
void ImageChanged(WrappedImagePtr, CanDeferInvalidation) override;
// A scrollbar part's Location() and PhysicalLocation() are relative to the
// scrollbar (instead of relative to any LayoutBox ancestor), and both are
// in physical coordinates.
LayoutBox* LocationContainer() const override {
NOT_DESTROYED();
return nullptr;
}
// A scrollbar part is not in the layout tree and is not laid out like other
// layout objects. CustomScrollbar will call scrollbar parts' SetFrameRect()
// from its SetFrameRect() when needed.
void UpdateLayout() override {
NOT_DESTROYED();
NOTREACHED();
}
// Have all padding getters return 0. The important point here is to avoid
// resolving percents against the containing block, since scroll bar corners
// don't always have one (so it would crash). Scroll bar corners are not
// actually laid out, and they don't have child content, so what we return
// here doesn't really matter.
LayoutUnit PaddingTop() const override {
NOT_DESTROYED();
return LayoutUnit();
}
LayoutUnit PaddingBottom() const override {
NOT_DESTROYED();
return LayoutUnit();
}
LayoutUnit PaddingLeft() const override {
NOT_DESTROYED();
return LayoutUnit();
}
LayoutUnit PaddingRight() const override {
NOT_DESTROYED();
return LayoutUnit();
}
void SetNeedsPaintInvalidation();
void RecordPercentLengthStats() const;
int ComputeSize(SizeType size_type,
const Length& length,
int container_size) const;
int ComputeWidth(int container_width) const;
int ComputeHeight(int container_height) const;
Member<ScrollableArea> scrollable_area_;
Member<CustomScrollbar> scrollbar_;
ScrollbarPart part_;
};
template <>
struct DowncastTraits<LayoutCustomScrollbarPart> {
static bool AllowFrom(const LayoutObject& object) {
return object.IsLayoutCustomScrollbarPart();
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_LAYOUT_LAYOUT_CUSTOM_SCROLLBAR_PART_H_
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