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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 LayoutScrollbarPart_h
#define LayoutScrollbarPart_h
#include "core/layout/LayoutBlock.h"
#include "platform/scroll/ScrollTypes.h"
namespace blink {
class LayoutScrollbar;
class ScrollableArea;
class LayoutScrollbarPart final : public LayoutBlock {
public:
static LayoutScrollbarPart* CreateAnonymous(Document*,
ScrollableArea*,
LayoutScrollbar* = nullptr,
ScrollbarPart = kNoPart);
const char* GetName() const override { return "LayoutScrollbarPart"; }
PaintLayerType LayerTypeRequired() const override { return kNoPaintLayer; }
void UpdateLayout() override;
// Scrollbar parts needs to be rendered at device pixel boundaries.
LayoutUnit MarginTop() const override {
DCHECK(IsIntegerValue(LayoutBlock::MarginTop()));
return LayoutBlock::MarginTop();
}
LayoutUnit MarginBottom() const override {
DCHECK(IsIntegerValue(LayoutBlock::MarginBottom()));
return LayoutBlock::MarginBottom();
}
LayoutUnit MarginLeft() const override {
DCHECK(IsIntegerValue(LayoutBlock::MarginLeft()));
return LayoutBlock::MarginLeft();
}
LayoutUnit MarginRight() const override {
DCHECK(IsIntegerValue(LayoutBlock::MarginRight()));
return LayoutBlock::MarginRight();
}
bool IsOfType(LayoutObjectType type) const override {
return type == kLayoutObjectLayoutScrollbarPart ||
LayoutBlock::IsOfType(type);
}
LayoutObject* ScrollbarStyleSource() const;
// Must call setStyleWithWritingModeOfParent() instead.
void SetStyle(scoped_refptr<ComputedStyle>) = delete;
protected:
void StyleWillChange(StyleDifference,
const ComputedStyle& new_style) override;
void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
void ImageChanged(WrappedImagePtr,
CanDeferInvalidation,
const IntRect* = nullptr) override;
private:
LayoutScrollbarPart(ScrollableArea*, LayoutScrollbar*, ScrollbarPart);
void ComputePreferredLogicalWidths() override;
// 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 { return LayoutUnit(); }
LayoutUnit PaddingBottom() const override { return LayoutUnit(); }
LayoutUnit PaddingLeft() const override { return LayoutUnit(); }
LayoutUnit PaddingRight() const override { return LayoutUnit(); }
void LayoutHorizontalPart();
void LayoutVerticalPart();
void ComputeScrollbarWidth();
void ComputeScrollbarHeight();
int CalcScrollbarThicknessUsing(SizeType,
const Length&,
int containing_length);
void SetNeedsPaintInvalidation();
bool AllowsOverflowClip() const override { return false; }
UntracedMember<ScrollableArea> scrollable_area_;
UntracedMember<LayoutScrollbar> scrollbar_;
ScrollbarPart part_;
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutScrollbarPart, IsLayoutScrollbarPart());
} // namespace blink
#endif // LayoutScrollbarPart_h