зеркало из https://github.com/mozilla/gecko-dev.git
83 строки
3.1 KiB
C++
83 строки
3.1 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* representation of a SMIL-animatable CSS property on an element */
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#ifndef mozilla_SMILCSSProperty_h
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#define mozilla_SMILCSSProperty_h
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#include "mozilla/Attributes.h"
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#include "mozilla/SMILAttr.h"
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#include "nsAtom.h"
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#include "nsCSSPropertyID.h"
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#include "nsCSSValue.h"
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namespace mozilla {
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class ComputedStyle;
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namespace dom {
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class Element;
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} // namespace dom
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/**
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* SMILCSSProperty: Implements the SMILAttr interface for SMIL animations
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* that target CSS properties. Represents a particular animation-targeted CSS
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* property on a particular element.
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*/
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class SMILCSSProperty : public SMILAttr {
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public:
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/**
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* Constructs a new SMILCSSProperty.
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* @param aPropID The CSS property we're interested in animating.
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* @param aElement The element whose CSS property is being animated.
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* @param aBaseComputedStyle The ComputedStyle to use when getting the base
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* value. If this is nullptr and GetBaseValue is
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* called, an empty SMILValue initialized with
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* the SMILCSSValueType will be returned.
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*/
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SMILCSSProperty(nsCSSPropertyID aPropID, dom::Element* aElement,
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ComputedStyle* aBaseComputedStyle);
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// SMILAttr methods
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virtual nsresult ValueFromString(
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const nsAString& aStr, const dom::SVGAnimationElement* aSrcElement,
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SMILValue& aValue, bool& aPreventCachingOfSandwich) const override;
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virtual SMILValue GetBaseValue() const override;
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virtual nsresult SetAnimValue(const SMILValue& aValue) override;
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virtual void ClearAnimValue() override;
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/**
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* Utility method - returns true if the given property is supported for
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* SMIL animation.
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*
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* @param aProperty The property to check for animation support.
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* @param aBackend The style backend to check for animation support.
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* This is a temporary measure until the Servo backend
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* supports all animatable properties (bug 1353918).
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* @return true if the given property is supported for SMIL animation, or
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* false otherwise
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*/
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static bool IsPropertyAnimatable(nsCSSPropertyID aPropID);
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protected:
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nsCSSPropertyID mPropID;
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// Using non-refcounted pointer for mElement -- we know mElement will stay
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// alive for my lifetime because a SMILAttr (like me) only lives as long
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// as the Compositing step, and DOM elements don't get a chance to die during
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// that time.
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dom::Element* mElement;
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// The style to use when fetching base styles.
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//
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// As with mElement, since a SMILAttr only lives as long as the
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// compositing step and since ComposeAttribute holds an owning reference to
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// the base ComputedStyle, we can use a non-owning reference here.
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ComputedStyle* mBaseComputedStyle;
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};
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} // namespace mozilla
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#endif // mozilla_SMILCSSProperty_h
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