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SVGAnimatedIntegerPair.h (4306B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef DOM_SVG_SVGANIMATEDINTEGERPAIR_H_
      8 #define DOM_SVG_SVGANIMATEDINTEGERPAIR_H_
      9 
     10 #include "DOMSVGAnimatedInteger.h"
     11 #include "mozilla/SMILAttr.h"
     12 #include "mozilla/UniquePtr.h"
     13 #include "nsCycleCollectionParticipant.h"
     14 #include "nsError.h"
     15 
     16 namespace mozilla {
     17 
     18 class SMILValue;
     19 
     20 namespace dom {
     21 class SVGAnimationElement;
     22 class SVGElement;
     23 }  // namespace dom
     24 
     25 class SVGAnimatedIntegerPair {
     26 public:
     27  friend class AutoChangeIntegerPairNotifier;
     28  using SVGElement = dom::SVGElement;
     29 
     30  enum PairIndex { eFirst, eSecond };
     31 
     32  void Init(uint8_t aAttrEnum = 0xff, int32_t aValue1 = 0,
     33            int32_t aValue2 = 0) {
     34    mAnimVal[0] = mBaseVal[0] = aValue1;
     35    mAnimVal[1] = mBaseVal[1] = aValue2;
     36    mAttrEnum = aAttrEnum;
     37    mIsAnimated = false;
     38    mIsBaseSet = false;
     39  }
     40 
     41  nsresult SetBaseValueString(const nsAString& aValue, SVGElement* aSVGElement);
     42  void GetBaseValueString(nsAString& aValue) const;
     43 
     44  void SetBaseValue(int32_t aValue, PairIndex aPairIndex,
     45                    SVGElement* aSVGElement);
     46  void SetBaseValues(int32_t aValue1, int32_t aValue2, SVGElement* aSVGElement);
     47  int32_t GetBaseValue(PairIndex aIndex) const {
     48    return mBaseVal[aIndex == eFirst ? 0 : 1];
     49  }
     50  void SetAnimValue(const int32_t aValue[2], SVGElement* aSVGElement);
     51  int32_t GetAnimValue(PairIndex aIndex) const {
     52    return mAnimVal[aIndex == eFirst ? 0 : 1];
     53  }
     54 
     55  // Returns true if the animated value of this integer has been explicitly
     56  // set (either by animation, or by taking on the base value which has been
     57  // explicitly set by markup or a DOM call), false otherwise.
     58  // If this returns false, the animated value is still valid, that is,
     59  // usable, and represents the default base value of the attribute.
     60  bool IsExplicitlySet() const { return mIsAnimated || mIsBaseSet; }
     61 
     62  already_AddRefed<dom::DOMSVGAnimatedInteger> ToDOMAnimatedInteger(
     63      PairIndex aIndex, SVGElement* aSVGElement);
     64  UniquePtr<SMILAttr> ToSMILAttr(SVGElement* aSVGElement);
     65 
     66 private:
     67  int32_t mAnimVal[2];
     68  int32_t mBaseVal[2];
     69  uint8_t mAttrEnum;  // element specified tracking for attribute
     70  bool mIsAnimated;
     71  bool mIsBaseSet;
     72 
     73 public:
     74  struct DOMAnimatedInteger final : public dom::DOMSVGAnimatedInteger {
     75    DOMAnimatedInteger(SVGAnimatedIntegerPair* aVal, PairIndex aIndex,
     76                       SVGElement* aSVGElement)
     77        : dom::DOMSVGAnimatedInteger(aSVGElement), mVal(aVal), mIndex(aIndex) {}
     78    virtual ~DOMAnimatedInteger();
     79 
     80    SVGAnimatedIntegerPair* mVal;  // kept alive because it belongs to content
     81    PairIndex mIndex;              // are we the first or second integer
     82 
     83    int32_t BaseVal() override { return mVal->GetBaseValue(mIndex); }
     84    void SetBaseVal(int32_t aValue) override {
     85      mVal->SetBaseValue(aValue, mIndex, mSVGElement);
     86    }
     87 
     88    // Script may have modified animation parameters or timeline -- DOM getters
     89    // need to flush any resample requests to reflect these modifications.
     90    int32_t AnimVal() override {
     91      mSVGElement->FlushAnimations();
     92      return mVal->GetAnimValue(mIndex);
     93    }
     94  };
     95 
     96  struct SMILIntegerPair : public SMILAttr {
     97   public:
     98    SMILIntegerPair(SVGAnimatedIntegerPair* aVal, SVGElement* aSVGElement)
     99        : mVal(aVal), mSVGElement(aSVGElement) {}
    100 
    101    // These will stay alive because a SMILAttr only lives as long
    102    // as the Compositing step, and DOM elements don't get a chance to
    103    // die during that.
    104    SVGAnimatedIntegerPair* mVal;
    105    SVGElement* mSVGElement;
    106 
    107    // SMILAttr methods
    108    nsresult ValueFromString(const nsAString& aStr,
    109                             const dom::SVGAnimationElement* aSrcElement,
    110                             SMILValue& aValue,
    111                             bool& aPreventCachingOfSandwich) const override;
    112    SMILValue GetBaseValue() const override;
    113    void ClearAnimValue() override;
    114    nsresult SetAnimValue(const SMILValue& aValue) override;
    115  };
    116 };
    117 
    118 }  // namespace mozilla
    119 
    120 #endif  // DOM_SVG_SVGANIMATEDINTEGERPAIR_H_