gecko-dev/content/smil/nsSMILTimeValueSpec.h

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 * 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
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 *
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 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Mozilla SMIL module.
 *
 * The Initial Developer of the Original Code is Brian Birtles.
 * Portions created by the Initial Developer are Copyright (C) 2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Brian Birtles <birtles@gmail.com>
 *
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 * either of 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"),
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#ifndef NS_SMILTIMEVALUESPEC_H_
#define NS_SMILTIMEVALUESPEC_H_

#include "nsSMILTimeValueSpecParams.h"
#include "nsReferencedElement.h"
#include "nsAutoPtr.h"
#include "nsIDOMEventListener.h"

class nsAString;
class nsSMILTimeValue;
class nsSMILTimedElement;
class nsSMILTimeContainer;
class nsSMILInstanceTime;
class nsSMILInterval;

//----------------------------------------------------------------------
// nsSMILTimeValueSpec class
//
// An individual element of a 'begin' or 'end' attribute, e.g. '5s', 'a.end'.
// This class handles the parsing of such specifications and performs the
// necessary event handling (for event, repeat, and accesskey specifications)
// and synchronisation (for syncbase specifications).
//
// For an overview of how this class is related to other SMIL time classes see
// the documentation in nsSMILTimeValue.h

class nsSMILTimeValueSpec
{
public:
  typedef mozilla::dom::Element Element;

  nsSMILTimeValueSpec(nsSMILTimedElement& aOwner, PRBool aIsBegin);
  ~nsSMILTimeValueSpec();

  nsresult SetSpec(const nsAString& aStringSpec, Element* aContextNode);
  void     ResolveReferences(nsIContent* aContextNode);
  PRBool   IsEventBased() const;

  void     HandleNewInterval(nsSMILInterval& aInterval,
                             const nsSMILTimeContainer* aSrcContainer);
  void     HandleTargetElementChange(Element* aNewTarget);

  // For created nsSMILInstanceTime objects
  PRBool   DependsOnBegin() const;
  void     HandleChangedInstanceTime(const nsSMILInstanceTime& aBaseTime,
                                     const nsSMILTimeContainer* aSrcContainer,
                                     nsSMILInstanceTime& aInstanceTimeToUpdate,
                                     PRBool aObjectChanged);
  void     HandleDeletedInstanceTime(nsSMILInstanceTime& aInstanceTime);

  // Cycle-collection support
  void Traverse(nsCycleCollectionTraversalCallback* aCallback);
  void Unlink();

protected:
  void UpdateReferencedElement(Element* aFrom, Element* aTo);
  void UnregisterFromReferencedElement(Element* aElement);
  nsSMILTimedElement* GetTimedElement(Element* aElement);
  void RegisterEventListener(Element* aElement);
  void UnregisterEventListener(Element* aElement);
  nsIEventListenerManager* GetEventListenerManager(Element* aElement,
      nsIDOMEventGroup** aSystemGroup);
  void HandleEvent(nsIDOMEvent* aEvent);
  PRBool CheckEventDetail(nsIDOMEvent* aEvent);
  nsSMILTimeValue ConvertBetweenTimeContainers(const nsSMILTimeValue& aSrcTime,
                                      const nsSMILTimeContainer* aSrcContainer);

  nsSMILTimedElement*           mOwner;
  PRPackedBool                  mIsBegin; // Indicates if *we* are a begin spec,
                                          // not to be confused with
                                          // mParams.mSyncBegin which indicates
                                          // if we're synced with the begin of
                                          // the target.
  nsSMILTimeValueSpecParams     mParams;

  class TimeReferenceElement : public nsReferencedElement
  {
  public:
    TimeReferenceElement(nsSMILTimeValueSpec* aOwner) : mSpec(aOwner) { }
    void ResetWithElement(Element* aTo) {
      nsRefPtr<Element> from = get();
      Unlink();
      ElementChanged(from, aTo);
    }

  protected:
    virtual void ElementChanged(Element* aFrom, Element* aTo)
    {
      nsReferencedElement::ElementChanged(aFrom, aTo);
      mSpec->UpdateReferencedElement(aFrom, aTo);
    }
    virtual PRBool IsPersistent() { return PR_TRUE; }
  private:
    nsSMILTimeValueSpec* mSpec;
  };

  TimeReferenceElement mReferencedElement;

  class EventListener : public nsIDOMEventListener
  {
  public:
    EventListener(nsSMILTimeValueSpec* aOwner) : mSpec(aOwner) { }
    void Disconnect()
    {
      mSpec = nsnull;
    }

    NS_DECL_ISUPPORTS
    NS_DECL_NSIDOMEVENTLISTENER

  private:
    nsSMILTimeValueSpec* mSpec;
  };
  nsCOMPtr<EventListener> mEventListener;
};

#endif // NS_SMILTIMEVALUESPEC_H_