content/svg/content/src/SVGAnimatedTransformList.h
author Michael Wu <mwu@mozilla.com>
Wed, 28 Sep 2011 23:19:26 -0700
changeset 79445 e7854b4d29ba905ae3994f821b160c989bac4260
parent 78862 e5e2d6577aa6d1938213dc267bb54788c97e518f
child 80486 ec7577dec4fceef0ac2717416d9c48289402d935
child 112094 cad26d2fb5af799dfe030fd2a8948d617eac2f52
permissions -rw-r--r--
Bug 675553 - Switch from PRBool to bool on a CLOSED TREE , r=bsmedberg,khuey,bz,cjones

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * ***** 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 Mozilla SVG Project code.
 *
 * 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):
 *   Brian Birtles <birtles@gmail.com>
 *
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 * 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"),
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 * ***** END LICENSE BLOCK ***** */

#ifndef MOZILLA_SVGANIMATEDTRANSFORMLIST_H__
#define MOZILLA_SVGANIMATEDTRANSFORMLIST_H__

#include "SVGTransformList.h"

class nsSVGElement;

#ifdef MOZ_SMIL
#include "nsISMILAttr.h"
#endif // MOZ_SMIL

namespace mozilla {

/**
 * Class SVGAnimatedTransformList
 *
 * This class is very different to the SVG DOM interface of the same name found
 * in the SVG specification. This is a lightweight internal class - see
 * DOMSVGAnimatedTransformList for the heavier DOM class that wraps instances of
 * this class and implements the SVG specification's SVGAnimatedTransformList
 * DOM interface.
 *
 * Except where noted otherwise, this class' methods take care of keeping the
 * appropriate DOM wrappers in sync (see the comment in
 * DOMSVGAnimatedTransformList::InternalBaseValListWillChangeTo) so that their
 * consumers don't need to concern themselves with that.
 */
class SVGAnimatedTransformList
{
  // friends so that they can get write access to mBaseVal
  friend class DOMSVGTransform;
  friend class DOMSVGTransformList;

public:
  SVGAnimatedTransformList() : mIsAttrSet(PR_FALSE) { }

  /**
   * Because it's so important that mBaseVal and its DOMSVGTransformList wrapper
   * (if any) be kept in sync (see the comment in
   * DOMSVGAnimatedTransformList::InternalBaseValListWillChangeTo), this method
   * returns a const reference. Only our friend classes may get mutable
   * references to mBaseVal.
   */
  const SVGTransformList& GetBaseValue() const {
    return mBaseVal;
  }

  nsresult SetBaseValueString(const nsAString& aValue);

  void ClearBaseValue();

  const SVGTransformList& GetAnimValue() const {
    return mAnimVal ? *mAnimVal : mBaseVal;
  }

  nsresult SetAnimValue(const SVGTransformList& aNewAnimValue,
                        nsSVGElement *aElement);

  void ClearAnimValue(nsSVGElement *aElement);

  bool IsExplicitlySet() const;

  bool IsAnimating() const {
    return !!mAnimVal;
  }

#ifdef MOZ_SMIL
  /// Callers own the returned nsISMILAttr
  nsISMILAttr* ToSMILAttr(nsSVGElement* aSVGElement);
#endif // MOZ_SMIL

private:

  // mAnimVal is a pointer to allow us to determine if we're being animated or
  // not. Making it a non-pointer member and using mAnimVal.IsEmpty() to check
  // if we're animating is not an option, since that would break animation *to*
  // the empty string (<set to="">).

  SVGTransformList mBaseVal;
  nsAutoPtr<SVGTransformList> mAnimVal;
  bool mIsAttrSet;

#ifdef MOZ_SMIL
  struct SMILAnimatedTransformList : public nsISMILAttr
  {
  public:
    SMILAnimatedTransformList(SVGAnimatedTransformList* aVal,
                              nsSVGElement* aSVGElement)
      : mVal(aVal)
      , mElement(aSVGElement)
    {}

    // nsISMILAttr methods
    virtual nsresult ValueFromString(const nsAString& aStr,
                                     const nsISMILAnimationElement* aSrcElement,
                                     nsSMILValue& aValue,
                                     bool& aPreventCachingOfSandwich) const;
    virtual nsSMILValue GetBaseValue() const;
    virtual void ClearAnimValue();
    virtual nsresult SetAnimValue(const nsSMILValue& aValue);

  protected:
    static void ParseValue(const nsAString& aSpec,
                           const nsIAtom* aTransformType,
                           nsSMILValue& aResult);
    static PRInt32 ParseParameterList(const nsAString& aSpec, float* aVars,
                                      PRInt32 aNVars);

    // These will stay alive because a nsISMILAttr only lives as long
    // as the Compositing step, and DOM elements don't get a chance to
    // die during that.
    SVGAnimatedTransformList* mVal;
    nsSVGElement* mElement;
  };
#endif // MOZ_SMIL
};

} // namespace mozilla

#endif // MOZILLA_SVGANIMATEDTRANSFORMLIST_H__