/* * Copyright (C) 2017 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 "RenderTreeBuilder.h" namespace WebCore { class RenderBlockFlow; class RenderTreeBuilder::MultiColumn { WTF_MAKE_FAST_ALLOCATED; public: MultiColumn(RenderTreeBuilder&); void updateAfterDescendants(RenderBlockFlow&); // Some renderers (column spanners) are moved out of the flow thread to live among column // sets. If |child| is such a renderer, resolve it to the placeholder that lives at the original // location in the tree. RenderObject* resolveMovedChild(RenderFragmentedFlow& enclosingFragmentedFlow, RenderObject* beforeChild); void multiColumnDescendantInserted(RenderMultiColumnFlow&, RenderObject& newDescendant); void multiColumnRelativeWillBeRemoved(RenderMultiColumnFlow&, RenderObject& relative); static RenderObject* adjustBeforeChildForMultiColumnSpannerIfNeeded(RenderObject& beforeChild); private: void createFragmentedFlow(RenderBlockFlow&); void destroyFragmentedFlow(RenderBlockFlow&); RenderObject* processPossibleSpannerDescendant(RenderMultiColumnFlow&, RenderObject*& subtreeRoot, RenderObject& descendant); void handleSpannerRemoval(RenderMultiColumnFlow&, RenderObject& spanner); RenderTreeBuilder& m_builder; }; }