зеркало из https://github.com/mozilla/gecko-dev.git
124 строки
4.2 KiB
C++
124 строки
4.2 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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#ifndef MOZILLA_SVGANIMATEDPATHSEGLIST_H__
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#define MOZILLA_SVGANIMATEDPATHSEGLIST_H__
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#include "mozilla/Attributes.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/UniquePtr.h"
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#include "nsAutoPtr.h"
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#include "nsISMILAttr.h"
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#include "SVGPathData.h"
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class nsSMILValue;
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namespace mozilla {
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namespace dom {
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class SVGAnimationElement;
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class SVGElement;
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} // namespace dom
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/**
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* Class SVGAnimatedPathSegList
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*
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* Despite the fact that no SVGAnimatedPathSegList interface or objects exist
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* in the SVG specification (unlike e.g. SVGAnimated*Length*List), we
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* nevertheless have this internal class. (Note that there is an
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* SVGAnimatedPathData interface, but that's quite different to
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* SVGAnimatedLengthList since it is inherited by elements, as opposed to
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* elements having members of that type.) The reason that we have this class is
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* to provide a single locked down point of entry to the SVGPathData objects,
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* which helps ensure that the DOM wrappers for SVGPathData objects' are always
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* kept in sync. This is vitally important (see the comment in
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* DOMSVGPathSegList::InternalListWillChangeTo) and frees consumers from having
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* to know or worry about wrappers (or forget about them!) for the most part.
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*/
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class SVGAnimatedPathSegList final {
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// friends so that they can get write access to mBaseVal and mAnimVal
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friend class DOMSVGPathSeg;
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friend class DOMSVGPathSegList;
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public:
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SVGAnimatedPathSegList() {}
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/**
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* Because it's so important that mBaseVal and its DOMSVGPathSegList wrapper
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* (if any) be kept in sync (see the comment in
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* DOMSVGPathSegList::InternalListWillChangeTo), this method returns a const
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* reference. Only our friend classes may get mutable references to mBaseVal.
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*/
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const SVGPathData& GetBaseValue() const { return mBaseVal; }
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nsresult SetBaseValueString(const nsAString& aValue);
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void ClearBaseValue();
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/**
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* const! See comment for GetBaseValue!
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*/
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const SVGPathData& GetAnimValue() const {
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return mAnimVal ? *mAnimVal : mBaseVal;
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}
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nsresult SetAnimValue(const SVGPathData& aValue, dom::SVGElement* aElement);
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void ClearAnimValue(dom::SVGElement* aElement);
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/**
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* Empty paths are not rendered.
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*/
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bool IsRendered() const;
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/**
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* Needed for correct DOM wrapper construction since GetAnimValue may
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* actually return the baseVal!
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*/
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void* GetBaseValKey() const { return (void*)&mBaseVal; }
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void* GetAnimValKey() const { return (void*)&mAnimVal; }
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bool IsAnimating() const { return !!mAnimVal; }
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UniquePtr<nsISMILAttr> ToSMILAttr(dom::SVGElement* aElement);
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size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const;
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private:
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// mAnimVal is a pointer to allow us to determine if we're being animated or
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// not. Making it a non-pointer member and using mAnimVal.IsEmpty() to check
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// if we're animating is not an option, since that would break animation *to*
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// the empty string (<set to="">).
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SVGPathData mBaseVal;
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nsAutoPtr<SVGPathData> mAnimVal;
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struct SMILAnimatedPathSegList : public nsISMILAttr {
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public:
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SMILAnimatedPathSegList(SVGAnimatedPathSegList* aVal,
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dom::SVGElement* aElement)
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: mVal(aVal), mElement(aElement) {}
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// These will stay alive because a nsISMILAttr only lives as long
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// as the Compositing step, and DOM elements don't get a chance to
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// die during that.
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SVGAnimatedPathSegList* mVal;
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dom::SVGElement* mElement;
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// nsISMILAttr methods
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virtual nsresult ValueFromString(
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const nsAString& aStr, const dom::SVGAnimationElement* aSrcElement,
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nsSMILValue& aValue, bool& aPreventCachingOfSandwich) const override;
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virtual nsSMILValue GetBaseValue() const override;
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virtual void ClearAnimValue() override;
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virtual nsresult SetAnimValue(const nsSMILValue& aValue) override;
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};
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};
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} // namespace mozilla
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#endif // MOZILLA_SVGANIMATEDPATHSEGLIST_H__
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