gecko/layout/style/nsAnimationManager.h

/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is nsAnimationManager, an implementation of part
 * of css3-animations.
 *
 * The Initial Developer of the Original Code is the Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
#ifndef nsAnimationManager_h_
#define nsAnimationManager_h_

#include "AnimationCommon.h"
#include "nsCSSPseudoElements.h"
#include "nsStyleContext.h"
#include "nsDataHashtable.h"
#include "nsGUIEvent.h"
#include "mozilla/TimeStamp.h"
#include "nsThreadUtils.h"

class nsCSSKeyframesRule;
struct AnimationPropertySegment;
struct ElementAnimation;
struct ElementAnimations;

namespace mozilla {
namespace css {
class Declaration;
}
}

class nsAnimationManager : public mozilla::css::CommonAnimationManager
{
public:
  nsAnimationManager(nsPresContext *aPresContext)
    : mozilla::css::CommonAnimationManager(aPresContext),
      mKeyframesListIsDirty(true)
  {
    mKeyframesRules.Init(16); // FIXME: make infallible!
  }

  struct AnimationEventInfo {
    nsRefPtr<mozilla::dom::Element> mElement;
    nsAnimationEvent mEvent;

    AnimationEventInfo(mozilla::dom::Element *aElement,
                       const nsString& aAnimationName,
                       PRUint32 aMessage, mozilla::TimeDuration aElapsedTime)
      : mElement(aElement),
        mEvent(true, aMessage, aAnimationName, aElapsedTime.ToSeconds())
    {
    }

    // nsAnimationEvent doesn't support copy-construction, so we need
    // to ourselves in order to work with nsTArray
    AnimationEventInfo(const AnimationEventInfo &aOther)
      : mElement(aOther.mElement),
        mEvent(true, aOther.mEvent.message,
               aOther.mEvent.animationName, aOther.mEvent.elapsedTime)
    {
    }
  };

  // nsIStyleRuleProcessor (parts)
  virtual void RulesMatching(ElementRuleProcessorData* aData);
  virtual void RulesMatching(PseudoElementRuleProcessorData* aData);
  virtual void RulesMatching(AnonBoxRuleProcessorData* aData);
#ifdef MOZ_XUL
  virtual void RulesMatching(XULTreeRuleProcessorData* aData);
#endif
  virtual NS_MUST_OVERRIDE size_t
    SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const MOZ_OVERRIDE;
  virtual NS_MUST_OVERRIDE size_t
    SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const MOZ_OVERRIDE;

  // nsARefreshObserver
  virtual void WillRefresh(mozilla::TimeStamp aTime);

  /**
   * Return the style rule that RulesMatching should add for
   * aStyleContext.  This might be different from what RulesMatching
   * actually added during aStyleContext's construction because the
   * element's animation-name may have changed.  (However, this does
   * return null during the non-animation restyling phase, as
   * RulesMatching does.)
   *
   * aStyleContext may be a style context for aElement or for its
   * :before or :after pseudo-element.
   */
  nsIStyleRule* CheckAnimationRule(nsStyleContext* aStyleContext,
                                   mozilla::dom::Element* aElement);

  void KeyframesListIsDirty() {
    mKeyframesListIsDirty = true;
  }

  typedef InfallibleTArray<AnimationEventInfo> EventArray;

  /**
   * Dispatch any pending events.  We accumulate animationend and
   * animationiteration events only during refresh driver notifications
   * (and dispatch them at the end of such notifications), but we
   * accumulate animationstart events at other points when style
   * contexts are created.
   */
  void DispatchEvents() {
    // Fast-path the common case: no events
    if (!mPendingEvents.IsEmpty()) {
      DoDispatchEvents();
    }
  }

private:
  ElementAnimations* GetElementAnimations(mozilla::dom::Element *aElement,
                                          nsCSSPseudoElements::Type aPseudoType,
                                          bool aCreateIfNeeded);
  void BuildAnimations(nsStyleContext* aStyleContext,
                       InfallibleTArray<ElementAnimation>& aAnimations);
  bool BuildSegment(InfallibleTArray<AnimationPropertySegment>& aSegments,
                    nsCSSProperty aProperty, const nsAnimation& aAnimation,
                    float aFromKey, nsStyleContext* aFromContext,
                    mozilla::css::Declaration* aFromDeclaration,
                    float aToKey, nsStyleContext* aToContext);
  nsIStyleRule* GetAnimationRule(mozilla::dom::Element* aElement,
                                 nsCSSPseudoElements::Type aPseudoType);

  nsCSSKeyframesRule* KeyframesRuleFor(const nsSubstring& aName);

  // The guts of DispatchEvents
  void DoDispatchEvents();

  bool mKeyframesListIsDirty;
  nsDataHashtable<nsStringHashKey, nsCSSKeyframesRule*> mKeyframesRules;

  EventArray mPendingEvents;
};

#endif /* !defined(nsAnimationManager_h_) */