зеркало из https://github.com/mozilla/gecko-dev.git
132 строки
4.1 KiB
C++
132 строки
4.1 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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#ifndef DOM_SVG_SVGTRANSFORMLIST_H_
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#define DOM_SVG_SVGTRANSFORMLIST_H_
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#include "gfxMatrix.h"
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#include "SVGTransform.h"
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#include "nsTArray.h"
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namespace mozilla {
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namespace dom {
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class DOMSVGTransform;
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class DOMSVGTransformList;
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} // namespace dom
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/**
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* ATTENTION! WARNING! WATCH OUT!!
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*
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* Consumers that modify objects of this type absolutely MUST keep the DOM
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* wrappers for those lists (if any) in sync!! That's why this class is so
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* locked down.
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*
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* The DOM wrapper class for this class is DOMSVGTransformList.
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*/
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class SVGTransformList {
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friend class SVGAnimatedTransformList;
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friend class dom::DOMSVGTransform;
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friend class dom::DOMSVGTransformList;
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public:
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SVGTransformList() = default;
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~SVGTransformList() = default;
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// Only methods that don't make/permit modification to this list are public.
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// Only our friend classes can access methods that may change us.
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/// This may return an incomplete string on OOM, but that's acceptable.
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void GetValueAsString(nsAString& aValue) const;
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bool IsEmpty() const { return mItems.IsEmpty(); }
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uint32_t Length() const { return mItems.Length(); }
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const SVGTransform& operator[](uint32_t aIndex) const {
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return mItems[aIndex];
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}
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bool operator==(const SVGTransformList& rhs) const {
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return mItems == rhs.mItems;
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}
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bool SetCapacity(uint32_t size) { return mItems.SetCapacity(size, fallible); }
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void Compact() { mItems.Compact(); }
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gfxMatrix GetConsolidationMatrix() const;
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// Access to methods that can modify objects of this type is deliberately
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// limited. This is to reduce the chances of someone modifying objects of
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// this type without taking the necessary steps to keep DOM wrappers in sync.
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// If you need wider access to these methods, consider adding a method to
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// DOMSVGAnimatedTransformList and having that class act as an intermediary so
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// it can take care of keeping DOM wrappers in sync.
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protected:
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/**
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* These may fail on OOM if the internal capacity needs to be increased, in
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* which case the list will be left unmodified.
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*/
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nsresult CopyFrom(const SVGTransformList& rhs);
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nsresult CopyFrom(const nsTArray<SVGTransform>& aTransformArray);
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SVGTransform& operator[](uint32_t aIndex) { return mItems[aIndex]; }
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/**
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* This may fail (return false) on OOM if the internal capacity is being
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* increased, in which case the list will be left unmodified.
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*/
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bool SetLength(uint32_t aNumberOfItems) {
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return mItems.SetLength(aNumberOfItems, fallible);
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}
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private:
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// Marking the following private only serves to show which methods are only
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// used by our friend classes (as opposed to our subclasses) - it doesn't
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// really provide additional safety.
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nsresult SetValueFromString(const nsAString& aValue);
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void Clear() { mItems.Clear(); }
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bool InsertItem(uint32_t aIndex, const SVGTransform& aTransform) {
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if (aIndex >= mItems.Length()) {
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aIndex = mItems.Length();
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}
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return !!mItems.InsertElementAt(aIndex, aTransform, fallible);
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}
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void ReplaceItem(uint32_t aIndex, const SVGTransform& aTransform) {
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MOZ_ASSERT(aIndex < mItems.Length(),
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"DOM wrapper caller should have raised INDEX_SIZE_ERR");
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mItems[aIndex] = aTransform;
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}
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void RemoveItem(uint32_t aIndex) {
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MOZ_ASSERT(aIndex < mItems.Length(),
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"DOM wrapper caller should have raised INDEX_SIZE_ERR");
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mItems.RemoveElementAt(aIndex);
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}
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bool AppendItem(const SVGTransform& aTransform) {
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return !!mItems.AppendElement(aTransform, fallible);
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}
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protected:
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/*
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* See SVGLengthList for the rationale for using
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* FallibleTArray<SVGTransform> instead of FallibleTArray<SVGTransform,
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* 1>.
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*/
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FallibleTArray<SVGTransform> mItems;
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};
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} // namespace mozilla
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#endif // DOM_SVG_SVGTRANSFORMLIST_H_
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