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      1 /*
      2  * Copyright (C) 2012 Google Inc. 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Neither the name of Google Inc. nor the names of its
     11  * contributors may be used to endorse or promote products derived from
     12  * this software without specific prior written permission.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     17  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     18  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     20  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef UserActionElementSet_h
     28 #define UserActionElementSet_h
     29 
     30 #include "platform/heap/Handle.h"
     31 #include "wtf/HashMap.h"
     32 #include "wtf/PassOwnPtr.h"
     33 #include "wtf/RefPtr.h"
     34 
     35 namespace WebCore {
     36 
     37 class Node;
     38 class Element;
     39 
     40 class UserActionElementSet FINAL {
     41     DISALLOW_ALLOCATION();
     42 public:
     43     bool isFocused(const Node* node) { return hasFlags(node, IsFocusedFlag); }
     44     bool isActive(const Node* node) { return hasFlags(node, IsActiveFlag); }
     45     bool isInActiveChain(const Node* node) { return hasFlags(node, InActiveChainFlag); }
     46     bool isHovered(const Node* node) { return hasFlags(node, IsHoveredFlag); }
     47     void setFocused(Node* node, bool enable) { setFlags(node, enable, IsFocusedFlag); }
     48     void setActive(Node* node, bool enable) { setFlags(node, enable, IsActiveFlag); }
     49     void setInActiveChain(Node* node, bool enable) { setFlags(node, enable, InActiveChainFlag); }
     50     void setHovered(Node* node, bool enable) { setFlags(node, enable, IsHoveredFlag); }
     51 
     52     UserActionElementSet();
     53     ~UserActionElementSet();
     54 
     55     void didDetach(Node*);
     56 
     57 #if !ENABLE(OILPAN)
     58     void documentDidRemoveLastRef();
     59 #endif
     60 
     61     void trace(Visitor*);
     62 
     63 private:
     64     enum ElementFlags {
     65         IsActiveFlag      = 1 ,
     66         InActiveChainFlag = 1 << 1,
     67         IsHoveredFlag     = 1 << 2,
     68         IsFocusedFlag     = 1 << 3
     69     };
     70 
     71     void setFlags(Node* node, bool enable, unsigned flags) { enable ? setFlags(node, flags) : clearFlags(node, flags); }
     72     void setFlags(Node*, unsigned);
     73     void clearFlags(Node*, unsigned);
     74     bool hasFlags(const Node*, unsigned flags) const;
     75 
     76     void setFlags(Element*, unsigned);
     77     void clearFlags(Element*, unsigned);
     78     bool hasFlags(const Element*, unsigned flags) const;
     79 
     80     typedef WillBeHeapHashMap<RefPtrWillBeMember<Element>, unsigned> ElementFlagMap;
     81     ElementFlagMap m_elements;
     82 };
     83 
     84 } // namespace
     85 
     86 #endif // UserActionElementSet_h
     87