gecko-dev/dom/animation/Keyframe.h

88 строки
2.7 KiB
C++

/* -*- 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_dom_Keyframe_h
#define mozilla_dom_Keyframe_h
#include "nsCSSPropertyID.h"
#include "nsCSSValue.h"
#include "nsTArray.h"
#include "mozilla/ComputedTimingFunction.h"
#include "mozilla/Maybe.h"
#include "mozilla/RefPtr.h"
struct RawServoDeclarationBlock;
namespace mozilla {
namespace dom {
enum class CompositeOperation : uint8_t;
}
/**
* A property-value pair specified on a keyframe.
*/
struct PropertyValuePair
{
nsCSSPropertyID mProperty;
// The specified value for the property. For shorthand properties or invalid
// property values, we store the specified property value as a token stream
// (string).
nsCSSValue mValue;
// The specified value when using the Servo backend.
RefPtr<RawServoDeclarationBlock> mServoDeclarationBlock;
bool operator==(const PropertyValuePair&) const;
};
/**
* A single keyframe.
*
* This is the canonical form in which keyframe effects are stored and
* corresponds closely to the type of objects returned via the getKeyframes()
* API.
*
* Before computing an output animation value, however, we flatten these frames
* down to a series of per-property value arrays where we also resolve any
* overlapping shorthands/longhands, convert specified CSS values to computed
* values, etc.
*
* When the target element or style context changes, however, we rebuild these
* per-property arrays from the original list of keyframes objects. As a result,
* these objects represent the master definition of the effect's values.
*/
struct Keyframe
{
Keyframe() = default;
Keyframe(const Keyframe& aOther) = default;
Keyframe(Keyframe&& aOther)
{
*this = Move(aOther);
}
Keyframe& operator=(const Keyframe& aOther) = default;
Keyframe& operator=(Keyframe&& aOther)
{
mOffset = aOther.mOffset;
mComputedOffset = aOther.mComputedOffset;
mTimingFunction = Move(aOther.mTimingFunction);
mComposite = Move(aOther.mComposite);
mPropertyValues = Move(aOther.mPropertyValues);
return *this;
}
Maybe<double> mOffset;
static constexpr double kComputedOffsetNotSet = -1.0;
double mComputedOffset = kComputedOffsetNotSet;
Maybe<ComputedTimingFunction> mTimingFunction; // Nothing() here means
// "linear"
Maybe<dom::CompositeOperation> mComposite;
nsTArray<PropertyValuePair> mPropertyValues;
};
}
#endif // mozilla_dom_Keyframe_h