1 /* 2 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above 9 * copyright notice, this list of conditions and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following 13 * disclaimer in the documentation and/or other materials 14 * provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 21 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 25 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 26 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef FlowThreadController_h 31 #define FlowThreadController_h 32 33 #include "core/rendering/RenderView.h" 34 #include "wtf/ListHashSet.h" 35 #include "wtf/OwnPtr.h" 36 37 namespace WebCore { 38 39 class RenderFlowThread; 40 class RenderNamedFlowThread; 41 42 typedef ListHashSet<RenderNamedFlowThread*> RenderNamedFlowThreadList; 43 44 class FlowThreadController { 45 WTF_MAKE_FAST_ALLOCATED; 46 public: 47 static PassOwnPtr<FlowThreadController> create(RenderView*); 48 ~FlowThreadController(); 49 currentRenderFlowThread()50 RenderFlowThread* currentRenderFlowThread() const { return m_currentRenderFlowThread; } setCurrentRenderFlowThread(RenderFlowThread * flowThread)51 void setCurrentRenderFlowThread(RenderFlowThread* flowThread) { m_currentRenderFlowThread = flowThread; } 52 isRenderNamedFlowThreadOrderDirty()53 bool isRenderNamedFlowThreadOrderDirty() const { return m_isRenderNamedFlowThreadOrderDirty; } setIsRenderNamedFlowThreadOrderDirty(bool dirty)54 void setIsRenderNamedFlowThreadOrderDirty(bool dirty) 55 { 56 m_isRenderNamedFlowThreadOrderDirty = dirty; 57 if (dirty) 58 m_view->setNeedsLayout(); 59 } 60 61 RenderNamedFlowThread* ensureRenderFlowThreadWithName(const AtomicString&); renderNamedFlowThreadList()62 const RenderNamedFlowThreadList* renderNamedFlowThreadList() const { return m_renderNamedFlowThreadList.get(); } hasRenderNamedFlowThreads()63 bool hasRenderNamedFlowThreads() const { return m_renderNamedFlowThreadList && !m_renderNamedFlowThreadList->isEmpty(); } 64 void layoutRenderNamedFlowThreads(); 65 void styleDidChange(); 66 67 void registerNamedFlowContentNode(Node*, RenderNamedFlowThread*); 68 void unregisterNamedFlowContentNode(Node*); 69 bool isContentNodeRegisteredWithAnyNamedFlow(const Node*) const; 70 hasFlowThreadsWithAutoLogicalHeightRegions()71 bool hasFlowThreadsWithAutoLogicalHeightRegions() const { return m_flowThreadsWithAutoLogicalHeightRegions; } incrementFlowThreadsWithAutoLogicalHeightRegions()72 void incrementFlowThreadsWithAutoLogicalHeightRegions() { ++m_flowThreadsWithAutoLogicalHeightRegions; } decrementFlowThreadsWithAutoLogicalHeightRegions()73 void decrementFlowThreadsWithAutoLogicalHeightRegions() { ASSERT(m_flowThreadsWithAutoLogicalHeightRegions > 0); --m_flowThreadsWithAutoLogicalHeightRegions; } 74 75 bool updateFlowThreadsNeedingLayout(); 76 bool updateFlowThreadsNeedingTwoStepLayout(); 77 void updateFlowThreadsIntoConstrainedPhase(); 78 79 #ifndef NDEBUG 80 bool isAutoLogicalHeightRegionsCountConsistent() const; 81 #endif 82 83 protected: 84 FlowThreadController(RenderView*); 85 void updateFlowThreadsChainIfNecessary(); 86 void resetFlowThreadsWithAutoHeightRegions(); 87 88 private: 89 RenderView* m_view; 90 RenderFlowThread* m_currentRenderFlowThread; 91 bool m_isRenderNamedFlowThreadOrderDirty; 92 unsigned m_flowThreadsWithAutoLogicalHeightRegions; 93 OwnPtr<RenderNamedFlowThreadList> m_renderNamedFlowThreadList; 94 // maps a content node to its render flow thread. 95 HashMap<const Node*, RenderNamedFlowThread*> m_mapNamedFlowContentNodes; 96 }; 97 98 } 99 100 #endif 101