text: /*
   * Copyright (C) 2012 Google 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:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
   * OWNER OR 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.
   */
  
  #ifndef UserActionElementSet_h
  #define UserActionElementSet_h
  
  #include "platform/heap/Handle.h"
  #include "platform/wtf/HashMap.h"
  
  namespace blink {
  
  class Node;
  class Element;
  
  class UserActionElementSet final {
    DISALLOW_NEW();
  
   public:
    bool IsFocused(const Node* node) { return HasFlags(node, kIsFocusedFlag); }
    bool HasFocusWithin(const Node* node) {
      return HasFlags(node, kHasFocusWithinFlag);
    }
    bool IsActive(const Node* node) { return HasFlags(node, kIsActiveFlag); }
    bool IsInActiveChain(const Node* node) {
      return HasFlags(node, kInActiveChainFlag);
    }
    bool IsDragged(const Node* node) { return HasFlags(node, kIsDraggedFlag); }
    bool IsHovered(const Node* node) { return HasFlags(node, kIsHoveredFlag); }
    void SetFocused(Node* node, bool enable) {
      SetFlags(node, enable, kIsFocusedFlag);
    }
    void SetHasFocusWithin(Node* node, bool enable) {
      SetFlags(node, enable, kHasFocusWithinFlag);
    }
    void SetActive(Node* node, bool enable) {
      SetFlags(node, enable, kIsActiveFlag);
    }
    void SetInActiveChain(Node* node, bool enable) {
      SetFlags(node, enable, kInActiveChainFlag);
    }
    void SetDragged(Node* node, bool enable) {
      SetFlags(node, enable, kIsDraggedFlag);
    }
    void SetHovered(Node* node, bool enable) {
      SetFlags(node, enable, kIsHoveredFlag);
    }
  
    UserActionElementSet();
    ~UserActionElementSet();
  
    void DidDetach(Element&);
  
    DECLARE_TRACE();
  
   private:
    enum ElementFlags {
      kIsActiveFlag = 1,
      kInActiveChainFlag = 1 << 1,
      kIsHoveredFlag = 1 << 2,
      kIsFocusedFlag = 1 << 3,
      kIsDraggedFlag = 1 << 4,
      kHasFocusWithinFlag = 1 << 5,
    };
  
    void SetFlags(Node* node, bool enable, unsigned flags) {
      enable ? SetFlags(node, flags) : ClearFlags(node, flags);
    }
    void SetFlags(Node*, unsigned);
    void ClearFlags(Node*, unsigned);
    bool HasFlags(const Node*, unsigned flags) const;
  
    void SetFlags(Element*, unsigned);
    void ClearFlags(Element*, unsigned);
    bool HasFlags(const Element*, unsigned flags) const;
  
    typedef HeapHashMap<Member<Element>, unsigned> ElementFlagMap;
    ElementFlagMap elements_;
  };
  
  }  // namespace blink
  
  #endif  // UserActionElementSet_h
  