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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 RenderScrollbarPart_h
#define RenderScrollbarPart_h
#include "core/rendering/RenderBlock.h"
#include "platform/scroll/ScrollTypes.h"
namespace blink {
class RenderScrollbar;
class RenderScrollbarPart final : public RenderBlock {
public:
static RenderScrollbarPart* createAnonymous(Document*, RenderScrollbar* = 0, ScrollbarPart = NoPart);
virtual ~RenderScrollbarPart();
virtual const char* renderName() const override { return "RenderScrollbarPart"; }
virtual LayerType layerTypeRequired() const override { return NoLayer; }
virtual void layout() override;
// Scrollbar parts needs to be rendered at device pixel boundaries.
virtual LayoutRectOutsets marginBoxOutsets() const override
{
ASSERT(isIntegerValue(RenderBlock::marginBoxOutsets().top()));
return RenderBlock::marginBoxOutsets();
}
virtual LayoutUnit marginTop() const override
{
ASSERT(isIntegerValue(RenderBlock::marginTop()));
return RenderBlock::marginTop();
}
virtual LayoutUnit marginBottom() const override
{
ASSERT(isIntegerValue(RenderBlock::marginBottom()));
return RenderBlock::marginBottom();
}
virtual LayoutUnit marginLeft() const override
{
ASSERT(isIntegerValue(RenderBlock::marginLeft()));
return RenderBlock::marginLeft();
}
virtual LayoutUnit marginRight() const override
{
ASSERT(isIntegerValue(RenderBlock::marginRight()));
return RenderBlock::marginRight();
}
virtual bool isOfType(RenderObjectType type) const override { return type == RenderObjectRenderScrollbarPart || RenderBlock::isOfType(type); }
RenderObject* rendererOwningScrollbar() const;
protected:
virtual void styleWillChange(StyleDifference, const RenderStyle& newStyle) override;
virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
virtual void imageChanged(WrappedImagePtr, const IntRect* = 0) override;
private:
RenderScrollbarPart(RenderScrollbar*, ScrollbarPart);
virtual 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.
virtual LayoutUnit paddingTop() const override { return LayoutUnit(); }
virtual LayoutUnit paddingBottom() const override { return LayoutUnit(); }
virtual LayoutUnit paddingLeft() const override { return LayoutUnit(); }
virtual LayoutUnit paddingRight() const override { return LayoutUnit(); }
virtual LayoutUnit paddingBefore() const override { return LayoutUnit(); }
virtual LayoutUnit paddingAfter() const override { return LayoutUnit(); }
virtual LayoutUnit paddingStart() const override { return LayoutUnit(); }
virtual LayoutUnit paddingEnd() const override { return LayoutUnit(); }
void layoutHorizontalPart();
void layoutVerticalPart();
void computeScrollbarWidth();
void computeScrollbarHeight();
RenderScrollbar* m_scrollbar;
ScrollbarPart m_part;
};
DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderScrollbarPart, isRenderScrollbarPart());
} // namespace blink
#endif // RenderScrollbarPart_h
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