Home | History | Annotate | Download | only in rendering 
      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 
     50     RenderFlowThread* currentRenderFlowThread() const { return m_currentRenderFlowThread; }
     51     void setCurrentRenderFlowThread(RenderFlowThread* flowThread) { m_currentRenderFlowThread = flowThread; }
     52 
     53     bool isRenderNamedFlowThreadOrderDirty() const { return m_isRenderNamedFlowThreadOrderDirty; }
     54     void setIsRenderNamedFlowThreadOrderDirty(bool dirty)
     55     {
     56         m_isRenderNamedFlowThreadOrderDirty = dirty;
     57         if (dirty)
     58             m_view->setNeedsLayout();
     59     }
     60 
     61     RenderNamedFlowThread* ensureRenderFlowThreadWithName(const AtomicString&);
     62     const RenderNamedFlowThreadList* renderNamedFlowThreadList() const { return m_renderNamedFlowThreadList.get(); }
     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 
     71     bool hasFlowThreadsWithAutoLogicalHeightRegions() const { return m_flowThreadsWithAutoLogicalHeightRegions; }
     72     void incrementFlowThreadsWithAutoLogicalHeightRegions() { ++m_flowThreadsWithAutoLogicalHeightRegions; }
     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