fune/dom/animation/TimingParams.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_TimingParams_h
#define mozilla_TimingParams_h

#include "nsStringFwd.h"
#include "mozilla/dom/Nullable.h"
#include "mozilla/dom/UnionTypes.h" // For OwningUnrestrictedDoubleOrString
#include "mozilla/ComputedTimingFunction.h"
#include "mozilla/Maybe.h"
#include "mozilla/StickyTimeDuration.h"
#include "mozilla/TimeStamp.h" // for TimeDuration

#include "mozilla/dom/AnimationEffectReadOnlyBinding.h" // for FillMode
                                                        // and PlaybackDirection

class nsIDocument;

namespace mozilla {

namespace dom {
class UnrestrictedDoubleOrKeyframeEffectOptions;
class UnrestrictedDoubleOrKeyframeAnimationOptions;
}

struct TimingParams
{
  TimingParams() = default;

  TimingParams(float aDuration, float aDelay,
               float aIterationCount,
               dom::PlaybackDirection aDirection,
               dom::FillMode aFillMode)
    : mIterations(aIterationCount)
    , mDirection(aDirection)
    , mFill(aFillMode)
  {
    mDuration.emplace(StickyTimeDuration::FromMilliseconds(aDuration));
    mDelay = TimeDuration::FromMilliseconds(aDelay);
    Update();
  }

  TimingParams(const TimeDuration& aDuration,
               const TimeDuration& aDelay,
               const TimeDuration& aEndDelay,
               float aIterations,
               float aIterationStart,
               dom::PlaybackDirection aDirection,
               dom::FillMode aFillMode,
               Maybe<ComputedTimingFunction>&& aFunction)
    : mDelay(aDelay)
    , mEndDelay(aEndDelay)
    , mIterations(aIterations)
    , mIterationStart(aIterationStart)
    , mDirection(aDirection)
    , mFill(aFillMode)
    , mFunction(aFunction)
  {
    mDuration.emplace(aDuration);
    Update();
  }

  template <class OptionsType>
  static TimingParams FromOptionsType(
    const OptionsType& aOptions,
    nsIDocument* aDocument,
    ErrorResult& aRv);
  static TimingParams FromOptionsUnion(
    const dom::UnrestrictedDoubleOrKeyframeEffectOptions& aOptions,
    nsIDocument* aDocument, ErrorResult& aRv);
  static TimingParams FromOptionsUnion(
    const dom::UnrestrictedDoubleOrKeyframeAnimationOptions& aOptions,
    nsIDocument* aDocument, ErrorResult& aRv);

  // Range-checks and validates an UnrestrictedDoubleOrString or
  // OwningUnrestrictedDoubleOrString object and converts to a
  // StickyTimeDuration value or Nothing() if aDuration is "auto".
  // Caller must check aRv.Failed().
  template <class DoubleOrString>
  static Maybe<StickyTimeDuration> ParseDuration(DoubleOrString& aDuration,
                                                 ErrorResult& aRv)
  {
    Maybe<StickyTimeDuration> result;
    if (aDuration.IsUnrestrictedDouble()) {
      double durationInMs = aDuration.GetAsUnrestrictedDouble();
      if (durationInMs >= 0) {
        result.emplace(StickyTimeDuration::FromMilliseconds(durationInMs));
      } else {
        aRv.ThrowTypeError<dom::MSG_ENFORCE_RANGE_OUT_OF_RANGE>(
          NS_LITERAL_STRING("duration"));
      }
    } else if (!aDuration.GetAsString().EqualsLiteral("auto")) {
      aRv.ThrowTypeError<dom::MSG_INVALID_DURATION_ERROR>(
        aDuration.GetAsString());
    }
    return result;
  }

  static void ValidateIterationStart(double aIterationStart,
                                     ErrorResult& aRv)
  {
    if (aIterationStart < 0) {
      aRv.ThrowTypeError<dom::MSG_ENFORCE_RANGE_OUT_OF_RANGE>(
        NS_LITERAL_STRING("iterationStart"));
    }
  }

  static void ValidateIterations(double aIterations, ErrorResult& aRv)
  {
    if (IsNaN(aIterations) || aIterations < 0) {
      aRv.ThrowTypeError<dom::MSG_ENFORCE_RANGE_OUT_OF_RANGE>(
        NS_LITERAL_STRING("iterations"));
    }
  }

  static Maybe<ComputedTimingFunction> ParseEasing(const nsAString& aEasing,
                                                   nsIDocument* aDocument,
                                                   ErrorResult& aRv);

  static StickyTimeDuration CalcActiveDuration(
    const Maybe<StickyTimeDuration>& aDuration,
    double aIterations)
  {
    // If either the iteration duration or iteration count is zero,
    // Web Animations says that the active duration is zero. This is to
    // ensure that the result is defined when the other argument is Infinity.
    static const StickyTimeDuration zeroDuration;
    if (!aDuration || aDuration->IsZero() || aIterations == 0.0) {
      return zeroDuration;
    }

    return aDuration->MultDouble(aIterations);
  }
  // Return the duration of the active interval calculated by duration and
  // iteration count.
  StickyTimeDuration ActiveDuration() const
  {
    MOZ_ASSERT(CalcActiveDuration(mDuration, mIterations) == mActiveDuration,
               "Cached value of active duration should be up to date");
    return mActiveDuration;
  }

  StickyTimeDuration EndTime() const
  {
    MOZ_ASSERT(mEndTime == std::max(mDelay + ActiveDuration() + mEndDelay,
                                    StickyTimeDuration()),
               "Cached value of end time should be up to date");
    return mEndTime;
  }

  bool operator==(const TimingParams& aOther) const;
  bool operator!=(const TimingParams& aOther) const
  {
    return !(*this == aOther);
  }

  void SetDuration(Maybe<StickyTimeDuration>&& aDuration)
  {
    mDuration = Move(aDuration);
    Update();
  }
  const Maybe<StickyTimeDuration>& Duration() const { return mDuration; }

  void SetDelay(const TimeDuration& aDelay)
  {
    mDelay = aDelay;
    Update();
  }
  const TimeDuration& Delay() const { return mDelay; }

  void SetEndDelay(const TimeDuration& aEndDelay)
  {
    mEndDelay = aEndDelay;
    Update();
  }
  const TimeDuration& EndDelay() const { return mEndDelay; }

  void SetIterations(double aIterations)
  {
    mIterations = aIterations;
    Update();
  }
  double Iterations() const { return mIterations; }

  void SetIterationStart(double aIterationStart)
  {
    mIterationStart = aIterationStart;
  }
  double IterationStart() const { return mIterationStart; }

  void SetDirection(dom::PlaybackDirection aDirection)
  {
    mDirection = aDirection;
  }
  dom::PlaybackDirection Direction() const { return mDirection; }

  void SetFill(dom::FillMode aFill)
  {
    mFill = aFill;
  }
  dom::FillMode Fill() const { return mFill; }

  void SetTimingFunction(Maybe<ComputedTimingFunction>&& aFunction)
  {
    mFunction = Move(aFunction);
  }
  const Maybe<ComputedTimingFunction>& TimingFunction() const
  {
    return mFunction;
  }

private:
  void Update()
  {
    mActiveDuration = CalcActiveDuration(mDuration, mIterations);

    mEndTime = std::max(mDelay + mActiveDuration + mEndDelay,
                        StickyTimeDuration());
  }

  // mDuration.isNothing() represents the "auto" value
  Maybe<StickyTimeDuration> mDuration;
  TimeDuration mDelay;      // Initializes to zero
  TimeDuration mEndDelay;
  double mIterations = 1.0; // Can be NaN, negative, +/-Infinity
  double mIterationStart = 0.0;
  dom::PlaybackDirection mDirection = dom::PlaybackDirection::Normal;
  dom::FillMode mFill = dom::FillMode::Auto;
  Maybe<ComputedTimingFunction> mFunction;
  StickyTimeDuration mActiveDuration = StickyTimeDuration();
  StickyTimeDuration mEndTime = StickyTimeDuration();
};

} // namespace mozilla

#endif // mozilla_TimingParams_h