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/*
* Copyright (C) 2018 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#pragma once
#include <wtf/IsoMalloc.h>
#include <wtf/OptionSet.h>
namespace WebCore {
class GraphicsContext;
class IntRect;
class LayoutSize;
class RenderView;
namespace Layout {
class ElementBox;
class LayoutState;
class FormattingContext;
// LayoutContext is the entry point for layout.
// LayoutContext::layout() generates the display tree for the root container's subtree (it does not run layout on the root though).
// Note, while the initial containing block is entry point for the initial layout, it does not necessarily need to be the entry point of any
// subsequent layouts (subtree layout). A non-initial, subtree layout could be initiated on multiple formatting contexts.
// Each formatting context has an entry point for layout, which potenitally means multiple entry points per layout frame.
class LayoutContext {
WTF_MAKE_ISO_ALLOCATED(LayoutContext);
public:
LayoutContext(LayoutState&);
void layout(const LayoutSize& rootContentBoxSize);
static std::unique_ptr<FormattingContext> createFormattingContext(const ElementBox& formattingContextRoot, LayoutState&);
#ifndef NDEBUG
// For testing purposes only
static void verifyAndOutputMismatchingLayoutTree(const LayoutState&, const RenderView&);
#endif
private:
void layoutFormattingContextSubtree(const ElementBox&);
LayoutState& layoutState() { return m_layoutState; }
LayoutState& m_layoutState;
};
}
}
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