зеркало из https://github.com/mozilla/gecko-dev.git
86 строки
2.8 KiB
C++
86 строки
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_KeyframeUtils_h
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#define mozilla_KeyframeUtils_h
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#include "nsTArrayForwardDeclare.h" // For nsTArray
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#include "js/RootingAPI.h" // For JS::Handle
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struct JSContext;
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class JSObject;
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namespace mozilla {
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struct AnimationProperty;
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enum class CSSPseudoElementType : uint8_t;
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class ErrorResult;
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struct Keyframe;
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namespace dom {
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class Element;
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} // namespace dom
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} // namespace mozilla
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namespace mozilla {
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/**
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* Utility methods for processing keyframes.
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*/
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class KeyframeUtils
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{
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public:
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/**
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* Converts a JS value representing a property-indexed keyframe or a sequence
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* of keyframes to an array of Keyframe objects.
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*
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* @param aCx The JSContext that corresponds to |aFrames|.
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* @param aFrames The JS value, provided as an optional IDL |object?| value,
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* that is the keyframe list specification.
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* @param aRv (out) Out-param to hold any error returned by this function.
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* Must be initially empty.
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* @return The set of processed keyframes. If an error occurs, aRv will be
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* filled-in with the appropriate error code and an empty array will be
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* returned.
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*/
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static nsTArray<Keyframe>
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GetKeyframesFromObject(JSContext* aCx,
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JS::Handle<JSObject*> aFrames,
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ErrorResult& aRv);
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/**
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* Fills in the mComputedOffset member of each keyframe in the given array
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* using the "distribute" spacing algorithm.
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*
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* http://w3c.github.io/web-animations/#distribute-keyframe-spacing-mode
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*
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* @param keyframes The set of keyframes to adjust.
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*/
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static void ApplyDistributeSpacing(nsTArray<Keyframe>& aKeyframes);
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/**
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* Converts an array of Keyframe objects into an array of AnimationProperty
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* objects. This involves expanding shorthand properties into longhand
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* properties, creating an array of computed values for each longhand
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* property and determining the offset and timing function to use for each
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* value.
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*
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* @param aStyleContext The style context to use when computing values.
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* @param aFrames The input keyframes.
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* @return The set of animation properties. If an error occurs, the returned
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* array will be empty.
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*/
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static nsTArray<AnimationProperty>
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GetAnimationPropertiesFromKeyframes(nsStyleContext* aStyleContext,
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dom::Element* aElement,
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CSSPseudoElementType aPseudoType,
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const nsTArray<Keyframe>& aFrames);
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};
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} // namespace mozilla
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#endif // mozilla_KeyframeUtils_h
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