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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 #include "config.h"
     32 #include "core/animation/Animation.h"
     33 
     34 #include "core/animation/DocumentTimeline.h"
     35 #include "core/animation/Player.h"
     36 #include "core/dom/Element.h"
     37 
     38 namespace WebCore {
     39 
     40 PassRefPtr<Animation> Animation::create(PassRefPtr<Element> target, PassRefPtr<AnimationEffect> effect, const Timing& timing, PassOwnPtr<TimedItemEventDelegate> eventDelegate)
     41 {
     42     return adoptRef(new Animation(target, effect, timing, eventDelegate));
     43 }
     44 
     45 Animation::Animation(PassRefPtr<Element> target, PassRefPtr<AnimationEffect> effect, const Timing& timing, PassOwnPtr<TimedItemEventDelegate> eventDelegate)
     46     : TimedItem(timing, eventDelegate)
     47     , m_target(target)
     48     , m_effect(effect)
     49     , m_activeInAnimationStack(false)
     50 {
     51 }
     52 
     53 void Animation::willDetach()
     54 {
     55     if (m_activeInAnimationStack)
     56         clearEffects();
     57 }
     58 
     59 static AnimationStack* ensureAnimationStack(Element* element)
     60 {
     61     return element->ensureActiveAnimations()->defaultStack();
     62 }
     63 
     64 void Animation::applyEffects(bool previouslyInEffect)
     65 {
     66     ASSERT(player());
     67     if (!previouslyInEffect) {
     68         ensureAnimationStack(m_target.get())->add(this);
     69         m_activeInAnimationStack = true;
     70     }
     71     m_compositableValues = m_effect->sample(currentIteration(), timeFraction());
     72     m_target->setNeedsStyleRecalc(LocalStyleChange, StyleChangeFromRenderer);
     73 }
     74 
     75 void Animation::clearEffects()
     76 {
     77     ASSERT(player());
     78     ASSERT(m_activeInAnimationStack);
     79     ensureAnimationStack(m_target.get())->remove(this);
     80     m_activeInAnimationStack = false;
     81     m_compositableValues.clear();
     82 }
     83 
     84 void Animation::updateChildrenAndEffects(bool wasInEffect) const
     85 {
     86     ASSERT(m_activeInAnimationStack == wasInEffect);
     87     if (isInEffect())
     88         const_cast<Animation*>(this)->applyEffects(wasInEffect);
     89     else if (wasInEffect)
     90         const_cast<Animation*>(this)->clearEffects();
     91 }
     92 
     93 } // namespace WebCore
     94