mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
420 lines
13 KiB
C++
420 lines
13 KiB
C++
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/* -*- 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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#include "nsSVGElement.h"
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#include "DOMSVGLengthList.h"
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#include "DOMSVGLength.h"
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#include "nsError.h"
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#include "SVGAnimatedLengthList.h"
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#include "nsCOMPtr.h"
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#include "mozilla/dom/SVGLengthListBinding.h"
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#include <algorithm>
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// See the comment in this file's header.
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// local helper functions
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namespace {
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using mozilla::DOMSVGLength;
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void UpdateListIndicesFromIndex(FallibleTArray<DOMSVGLength*>& aItemsArray,
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uint32_t aStartingIndex)
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{
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uint32_t length = aItemsArray.Length();
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for (uint32_t i = aStartingIndex; i < length; ++i) {
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if (aItemsArray[i]) {
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aItemsArray[i]->UpdateListIndex(i);
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}
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}
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}
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} // namespace
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namespace mozilla {
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// We could use NS_IMPL_CYCLE_COLLECTION(, except that in Unlink() we need to
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// clear our DOMSVGAnimatedLengthList's weak ref to us to be safe. (The other
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// option would be to not unlink and rely on the breaking of the other edges in
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// the cycle, as NS_SVG_VAL_IMPL_CYCLE_COLLECTION does.)
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NS_IMPL_CYCLE_COLLECTION_CLASS(DOMSVGLengthList)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGLengthList)
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if (tmp->mAList) {
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if (tmp->IsAnimValList()) {
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tmp->mAList->mAnimVal = nullptr;
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} else {
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tmp->mAList->mBaseVal = nullptr;
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}
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mAList)
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}
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NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGLengthList)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAList)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGLengthList)
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NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMSVGLengthList)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMSVGLengthList)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMSVGLengthList)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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JSObject*
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DOMSVGLengthList::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
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{
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return mozilla::dom::SVGLengthListBinding::Wrap(cx, this, aGivenProto);
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}
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//----------------------------------------------------------------------
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// Helper class: AutoChangeLengthListNotifier
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// Stack-based helper class to pair calls to WillChangeLengthList and
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// DidChangeLengthList.
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class MOZ_RAII AutoChangeLengthListNotifier
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{
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public:
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explicit AutoChangeLengthListNotifier(DOMSVGLengthList* aLengthList MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mLengthList(aLengthList)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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MOZ_ASSERT(mLengthList, "Expecting non-null lengthList");
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mEmptyOrOldValue =
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mLengthList->Element()->WillChangeLengthList(mLengthList->AttrEnum());
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}
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~AutoChangeLengthListNotifier()
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{
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mLengthList->Element()->DidChangeLengthList(mLengthList->AttrEnum(),
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mEmptyOrOldValue);
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if (mLengthList->IsAnimating()) {
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mLengthList->Element()->AnimationNeedsResample();
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}
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}
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private:
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DOMSVGLengthList* const mLengthList;
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nsAttrValue mEmptyOrOldValue;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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void
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DOMSVGLengthList::InternalListLengthWillChange(uint32_t aNewLength)
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{
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uint32_t oldLength = mItems.Length();
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if (aNewLength > DOMSVGLength::MaxListIndex()) {
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// It's safe to get out of sync with our internal list as long as we have
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// FEWER items than it does.
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aNewLength = DOMSVGLength::MaxListIndex();
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}
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RefPtr<DOMSVGLengthList> kungFuDeathGrip;
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if (aNewLength < oldLength) {
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// RemovingFromList() might clear last reference to |this|.
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// Retain a temporary reference to keep from dying before returning.
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kungFuDeathGrip = this;
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}
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// If our length will decrease, notify the items that will be removed:
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for (uint32_t i = aNewLength; i < oldLength; ++i) {
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if (mItems[i]) {
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mItems[i]->RemovingFromList();
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}
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}
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if (!mItems.SetLength(aNewLength, fallible)) {
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// We silently ignore SetLength OOM failure since being out of sync is safe
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// so long as we have *fewer* items than our internal list.
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mItems.Clear();
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return;
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}
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// If our length has increased, null out the new pointers:
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for (uint32_t i = oldLength; i < aNewLength; ++i) {
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mItems[i] = nullptr;
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}
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}
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SVGLengthList&
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DOMSVGLengthList::InternalList() const
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{
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SVGAnimatedLengthList *alist = Element()->GetAnimatedLengthList(AttrEnum());
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return IsAnimValList() && alist->mAnimVal ? *alist->mAnimVal : alist->mBaseVal;
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}
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// ----------------------------------------------------------------------------
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void
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DOMSVGLengthList::Clear(ErrorResult& aError)
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{
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if (IsAnimValList()) {
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aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return;
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}
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if (LengthNoFlush() > 0) {
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AutoChangeLengthListNotifier notifier(this);
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// Notify any existing DOM items of removal *before* truncating the lists
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// so that they can find their SVGLength internal counterparts and copy
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// their values. This also notifies the animVal list:
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mAList->InternalBaseValListWillChangeTo(SVGLengthList());
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mItems.Clear();
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InternalList().Clear();
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}
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}
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already_AddRefed<DOMSVGLength>
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DOMSVGLengthList::Initialize(DOMSVGLength& newItem,
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ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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// If newItem already has an owner or is reflecting an attribute, we should
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// insert a clone of newItem, and for consistency, this should happen even if
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// *this* is the list that newItem is currently in. Note that in the case of
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// newItem being in this list, the Clear() call before the InsertItemBefore()
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// call would remove it from this list, and so the InsertItemBefore() call
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// would not insert a clone of newItem, it would actually insert newItem. To
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// prevent that from happening we have to do the clone here, if necessary.
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RefPtr<DOMSVGLength> domItem = &newItem;
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if (!domItem) {
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error.Throw(NS_ERROR_DOM_SVG_WRONG_TYPE_ERR);
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return nullptr;
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}
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if (domItem->HasOwner() || domItem->IsReflectingAttribute()) {
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domItem = domItem->Copy();
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}
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ErrorResult rv;
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Clear(rv);
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MOZ_ASSERT(!rv.Failed());
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return InsertItemBefore(*domItem, 0, error);
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}
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already_AddRefed<DOMSVGLength>
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DOMSVGLengthList::GetItem(uint32_t index, ErrorResult& error)
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{
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bool found;
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RefPtr<DOMSVGLength> item = IndexedGetter(index, found, error);
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if (!found) {
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error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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}
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return item.forget();
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}
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already_AddRefed<DOMSVGLength>
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DOMSVGLengthList::IndexedGetter(uint32_t index, bool& found, ErrorResult& error)
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{
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if (IsAnimValList()) {
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Element()->FlushAnimations();
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}
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found = index < LengthNoFlush();
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if (found) {
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return GetItemAt(index);
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}
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return nullptr;
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}
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already_AddRefed<DOMSVGLength>
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DOMSVGLengthList::InsertItemBefore(DOMSVGLength& newItem,
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uint32_t index,
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ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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index = std::min(index, LengthNoFlush());
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if (index >= DOMSVGLength::MaxListIndex()) {
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error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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RefPtr<DOMSVGLength> domItem = &newItem;
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if (!domItem) {
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error.Throw(NS_ERROR_DOM_SVG_WRONG_TYPE_ERR);
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return nullptr;
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}
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if (domItem->HasOwner() || domItem->IsReflectingAttribute()) {
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domItem = domItem->Copy(); // must do this before changing anything!
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}
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// Ensure we have enough memory so we can avoid complex error handling below:
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if (!mItems.SetCapacity(mItems.Length() + 1, fallible) ||
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!InternalList().SetCapacity(InternalList().Length() + 1)) {
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error.Throw(NS_ERROR_OUT_OF_MEMORY);
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return nullptr;
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}
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if (AnimListMirrorsBaseList()) {
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if (!mAList->mAnimVal->mItems.SetCapacity(
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mAList->mAnimVal->mItems.Length() + 1, fallible)) {
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error.Throw(NS_ERROR_OUT_OF_MEMORY);
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return nullptr;
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}
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}
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AutoChangeLengthListNotifier notifier(this);
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// Now that we know we're inserting, keep animVal list in sync as necessary.
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MaybeInsertNullInAnimValListAt(index);
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InternalList().InsertItem(index, domItem->ToSVGLength());
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MOZ_ALWAYS_TRUE(mItems.InsertElementAt(index, domItem.get(), fallible));
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// This MUST come after the insertion into InternalList(), or else under the
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// insertion into InternalList() the values read from domItem would be bad
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// data from InternalList() itself!:
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domItem->InsertingIntoList(this, AttrEnum(), index, IsAnimValList());
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UpdateListIndicesFromIndex(mItems, index + 1);
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return domItem.forget();
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}
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already_AddRefed<DOMSVGLength>
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DOMSVGLengthList::ReplaceItem(DOMSVGLength& newItem,
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uint32_t index,
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ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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RefPtr<DOMSVGLength> domItem = &newItem;
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if (!domItem) {
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error.Throw(NS_ERROR_DOM_SVG_WRONG_TYPE_ERR);
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return nullptr;
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}
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if (index >= LengthNoFlush()) {
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error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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if (domItem->HasOwner() || domItem->IsReflectingAttribute()) {
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domItem = domItem->Copy(); // must do this before changing anything!
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}
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AutoChangeLengthListNotifier notifier(this);
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if (mItems[index]) {
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// Notify any existing DOM item of removal *before* modifying the lists so
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// that the DOM item can copy the *old* value at its index:
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mItems[index]->RemovingFromList();
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}
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InternalList()[index] = domItem->ToSVGLength();
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mItems[index] = domItem;
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// This MUST come after the ToSVGPoint() call, otherwise that call
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// would end up reading bad data from InternalList()!
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domItem->InsertingIntoList(this, AttrEnum(), index, IsAnimValList());
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return domItem.forget();
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}
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already_AddRefed<DOMSVGLength>
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DOMSVGLengthList::RemoveItem(uint32_t index,
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ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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if (index >= LengthNoFlush()) {
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error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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AutoChangeLengthListNotifier notifier(this);
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// Now that we know we're removing, keep animVal list in sync as necessary.
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// Do this *before* touching InternalList() so the removed item can get its
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// internal value.
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MaybeRemoveItemFromAnimValListAt(index);
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// We have to return the removed item, so get it, creating it if necessary:
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nsCOMPtr<DOMSVGLength> result = GetItemAt(index);
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// Notify the DOM item of removal *before* modifying the lists so that the
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// DOM item can copy its *old* value:
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mItems[index]->RemovingFromList();
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InternalList().RemoveItem(index);
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mItems.RemoveElementAt(index);
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UpdateListIndicesFromIndex(mItems, index);
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return result.forget();
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}
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already_AddRefed<DOMSVGLength>
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DOMSVGLengthList::GetItemAt(uint32_t aIndex)
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{
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MOZ_ASSERT(aIndex < mItems.Length());
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if (!mItems[aIndex]) {
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mItems[aIndex] = new DOMSVGLength(this, AttrEnum(), aIndex, IsAnimValList());
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}
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RefPtr<DOMSVGLength> result = mItems[aIndex];
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return result.forget();
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}
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void
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DOMSVGLengthList::MaybeInsertNullInAnimValListAt(uint32_t aIndex)
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{
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MOZ_ASSERT(!IsAnimValList(), "call from baseVal to animVal");
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if (!AnimListMirrorsBaseList()) {
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return;
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}
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DOMSVGLengthList* animVal = mAList->mAnimVal;
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MOZ_ASSERT(animVal, "AnimListMirrorsBaseList() promised a non-null animVal");
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MOZ_ASSERT(animVal->mItems.Length() == mItems.Length(),
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"animVal list not in sync!");
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MOZ_ALWAYS_TRUE(animVal->mItems.InsertElementAt(aIndex, nullptr, fallible));
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UpdateListIndicesFromIndex(animVal->mItems, aIndex + 1);
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}
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void
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DOMSVGLengthList::MaybeRemoveItemFromAnimValListAt(uint32_t aIndex)
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{
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MOZ_ASSERT(!IsAnimValList(), "call from baseVal to animVal");
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if (!AnimListMirrorsBaseList()) {
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return;
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}
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// This needs to be a strong reference; otherwise, the RemovingFromList call
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// below might drop the last reference to animVal before we're done with it.
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RefPtr<DOMSVGLengthList> animVal = mAList->mAnimVal;
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MOZ_ASSERT(animVal, "AnimListMirrorsBaseList() promised a non-null animVal");
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MOZ_ASSERT(animVal->mItems.Length() == mItems.Length(),
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"animVal list not in sync!");
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if (animVal->mItems[aIndex]) {
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animVal->mItems[aIndex]->RemovingFromList();
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}
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animVal->mItems.RemoveElementAt(aIndex);
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UpdateListIndicesFromIndex(animVal->mItems, aIndex);
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}
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} // namespace mozilla
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