| /* |
| * 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 |
| |
| #if ENABLE(LAYOUT_FORMATTING_CONTEXT) |
| |
| #include "FormattingContext.h" |
| #include "FormattingState.h" |
| #include "LayoutBox.h" |
| #include <wtf/IsoMalloc.h> |
| |
| namespace WebCore { |
| |
| namespace Display { |
| class Box; |
| } |
| |
| namespace Layout { |
| |
| class StyleDiff; |
| |
| // LayoutContext is the entry point for layout. It takes a (formatting root)container which acts as the root of the layout context. |
| // LayoutContext::layout() generates the display tree for the root container's subtree (it does not run layout on the root though). |
| // Note, while the root container is suppposed to be the entry point for the initial layout, it does not necessarily need to be the entry point of any |
| // subsequent layouts (subtree layout). |
| // LayoutContext also holds the formatting states. They cache formatting context specific data to enable performant incremental layouts. |
| class LayoutContext { |
| WTF_MAKE_ISO_ALLOCATED(LayoutContext); |
| public: |
| LayoutContext(const Box& root); |
| |
| void updateLayout(); |
| |
| void addDisplayBox(const Box&, Display::Box&); |
| Display::Box* displayBox(const Box&) const; |
| |
| void markNeedsLayout(const Box&, StyleDiff); |
| bool needsLayout(const Box&) const; |
| |
| FormattingState& formattingStateForBox(const Box&) const; |
| FormattingState& establishedFormattingState(const Box& formattingContextRoot, const FormattingContext&); |
| std::unique_ptr<FormattingContext> formattingContext(const Box& formattingContextRoot); |
| |
| private: |
| WeakPtr<Box> m_root; |
| HashMap<const Box*, std::unique_ptr<FormattingState>> m_formattingStates; |
| }; |
| |
| } |
| } |
| #endif |