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      1 /*
      2  * Copyright (C) 2013 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  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef ActiveAnimations_h
     32 #define ActiveAnimations_h
     33 
     34 #include "core/animation/AnimationStack.h"
     35 #include "core/animation/css/CSSAnimations.h"
     36 #include "wtf/HashCountedSet.h"
     37 #include "wtf/HashMap.h"
     38 #include "wtf/RefPtr.h"
     39 #include "wtf/Vector.h"
     40 
     41 namespace blink {
     42 
     43 class CSSAnimations;
     44 class RenderObject;
     45 class Element;
     46 
     47 typedef WillBeHeapHashCountedSet<RawPtrWillBeWeakMember<AnimationPlayer> > AnimationPlayerCountedSet;
     48 
     49 class ActiveAnimations : public NoBaseWillBeGarbageCollectedFinalized<ActiveAnimations> {
     50     WTF_MAKE_NONCOPYABLE(ActiveAnimations);
     51 public:
     52     ActiveAnimations()
     53         : m_animationStyleChange(false)
     54     {
     55     }
     56 
     57     ~ActiveAnimations();
     58 
     59     // Animations that are currently active for this element, their effects will be applied
     60     // during a style recalc. CSS Transitions are included in this stack.
     61     AnimationStack& defaultStack() { return m_defaultStack; }
     62     const AnimationStack& defaultStack() const { return m_defaultStack; }
     63     // Tracks the state of active CSS Animations and Transitions. The individual animations
     64     // will also be part of the default stack, but the mapping betwen animation name and
     65     // player is kept here.
     66     CSSAnimations& cssAnimations() { return m_cssAnimations; }
     67     const CSSAnimations& cssAnimations() const { return m_cssAnimations; }
     68 
     69     // AnimationPlayers which have animations targeting this element.
     70     AnimationPlayerCountedSet& players() { return m_players; }
     71 
     72     bool isEmpty() const { return m_defaultStack.isEmpty() && m_cssAnimations.isEmpty() && m_players.isEmpty(); }
     73 
     74     void cancelAnimationOnCompositor();
     75 
     76     void updateAnimationFlags(RenderStyle&);
     77     void setAnimationStyleChange(bool animationStyleChange) { m_animationStyleChange = animationStyleChange; }
     78 
     79 #if !ENABLE(OILPAN)
     80     void addAnimation(Animation* animation) { m_animations.append(animation); }
     81     void notifyAnimationDestroyed(Animation* animation) { m_animations.remove(m_animations.find(animation)); }
     82 #endif
     83 
     84     void trace(Visitor*);
     85 
     86 private:
     87     bool isAnimationStyleChange() const { return m_animationStyleChange; }
     88 
     89     AnimationStack m_defaultStack;
     90     CSSAnimations m_cssAnimations;
     91     AnimationPlayerCountedSet m_players;
     92     bool m_animationStyleChange;
     93 
     94 #if !ENABLE(OILPAN)
     95     // FIXME: Oilpan: This is to avoid a reference cycle that keeps Elements alive
     96     // and won't be needed once the Node hierarchy becomes traceable.
     97     Vector<Animation*> m_animations;
     98 #endif
     99 
    100     // CSSAnimations checks if a style change is due to animation.
    101     friend class CSSAnimations;
    102 };
    103 
    104 } // namespace blink
    105 
    106 #endif
    107