зеркало из https://github.com/mozilla/gecko-dev.git
140 строки
4.4 KiB
C++
140 строки
4.4 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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#include "mozilla/dom/SVGSwitchElement.h"
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#include "nsLayoutUtils.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/SVGUtils.h"
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#include "mozilla/dom/SVGSwitchElementBinding.h"
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class nsIFrame;
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NS_IMPL_NS_NEW_SVG_ELEMENT(Switch)
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namespace mozilla::dom {
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JSObject* SVGSwitchElement::WrapNode(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return SVGSwitchElement_Binding::Wrap(aCx, this, aGivenProto);
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}
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//----------------------------------------------------------------------
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// nsISupports methods
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NS_IMPL_CYCLE_COLLECTION_INHERITED(SVGSwitchElement, SVGSwitchElementBase,
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mActiveChild)
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NS_IMPL_ADDREF_INHERITED(SVGSwitchElement, SVGSwitchElementBase)
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NS_IMPL_RELEASE_INHERITED(SVGSwitchElement, SVGSwitchElementBase)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SVGSwitchElement)
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NS_INTERFACE_MAP_END_INHERITING(SVGSwitchElementBase)
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//----------------------------------------------------------------------
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// Implementation
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SVGSwitchElement::SVGSwitchElement(
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
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: SVGSwitchElementBase(std::move(aNodeInfo)) {}
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void SVGSwitchElement::MaybeInvalidate() {
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// We must not change mActiveChild until after
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// InvalidateAndScheduleBoundsUpdate has been called, otherwise
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// it will not correctly invalidate the old mActiveChild area.
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nsIContent* newActiveChild = FindActiveChild();
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if (newActiveChild == mActiveChild) {
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return;
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}
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nsIFrame* frame = GetPrimaryFrame();
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if (frame) {
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nsLayoutUtils::PostRestyleEvent(this, RestyleHint{0},
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nsChangeHint_InvalidateRenderingObservers);
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SVGUtils::ScheduleReflowSVG(frame);
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}
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mActiveChild = newActiveChild;
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}
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//----------------------------------------------------------------------
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// nsINode methods
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NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGSwitchElement)
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//----------------------------------------------------------------------
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// nsINode methods
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void SVGSwitchElement::InsertChildBefore(nsIContent* aKid,
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nsIContent* aBeforeThis, bool aNotify,
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ErrorResult& aRv) {
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SVGSwitchElementBase::InsertChildBefore(aKid, aBeforeThis, aNotify, aRv);
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if (aRv.Failed()) {
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return;
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}
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MaybeInvalidate();
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}
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void SVGSwitchElement::RemoveChildNode(nsIContent* aKid, bool aNotify) {
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SVGSwitchElementBase::RemoveChildNode(aKid, aNotify);
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MaybeInvalidate();
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}
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//----------------------------------------------------------------------
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// Implementation Helpers:
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nsIContent* SVGSwitchElement::FindActiveChild() const {
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nsAutoString acceptLangs;
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Preferences::GetLocalizedString("intl.accept_languages", acceptLangs);
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int32_t bestLanguagePreferenceRank = -1;
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nsIContent* bestChild = nullptr;
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nsIContent* defaultChild = nullptr;
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for (nsIContent* child = nsINode::GetFirstChild(); child;
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child = child->GetNextSibling()) {
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if (!child->IsElement()) {
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continue;
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}
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nsCOMPtr<SVGTests> tests(do_QueryInterface(child));
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if (tests) {
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if (tests->PassesConditionalProcessingTestsIgnoringSystemLanguage()) {
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int32_t languagePreferenceRank =
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tests->GetBestLanguagePreferenceRank(acceptLangs);
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switch (languagePreferenceRank) {
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case 0:
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// best possible match
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return child;
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case -1:
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// no match
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break;
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case -2:
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// no systemLanguage attribute. If there's nothing better
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// we'll use the first such child.
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if (!defaultChild) {
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defaultChild = child;
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}
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break;
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default:
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if (bestLanguagePreferenceRank == -1 ||
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languagePreferenceRank < bestLanguagePreferenceRank) {
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bestLanguagePreferenceRank = languagePreferenceRank;
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bestChild = child;
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}
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break;
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}
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}
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} else if (!bestChild) {
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bestChild = child;
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}
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}
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return bestChild ? bestChild : defaultChild;
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}
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} // namespace mozilla::dom
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