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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/SVGSwitchElement.h"
#include "nsLayoutUtils.h"
#include "mozilla/Preferences.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/dom/SVGSwitchElementBinding.h"
class nsIFrame;
NS_IMPL_NS_NEW_SVG_ELEMENT(Switch)
namespace mozilla::dom {
JSObject* SVGSwitchElement::WrapNode(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return SVGSwitchElement_Binding::Wrap(aCx, this, aGivenProto);
}
//----------------------------------------------------------------------
// nsISupports methods
NS_IMPL_CYCLE_COLLECTION_INHERITED(SVGSwitchElement, SVGSwitchElementBase,
mActiveChild)
NS_IMPL_ADDREF_INHERITED(SVGSwitchElement, SVGSwitchElementBase)
NS_IMPL_RELEASE_INHERITED(SVGSwitchElement, SVGSwitchElementBase)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SVGSwitchElement)
NS_INTERFACE_MAP_END_INHERITING(SVGSwitchElementBase)
//----------------------------------------------------------------------
// Implementation
SVGSwitchElement::SVGSwitchElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
: SVGSwitchElementBase(std::move(aNodeInfo)) {}
void SVGSwitchElement::MaybeInvalidate() {
// We must not change mActiveChild until after
// InvalidateAndScheduleBoundsUpdate has been called, otherwise
// it will not correctly invalidate the old mActiveChild area.
nsIContent* newActiveChild = FindActiveChild();
if (newActiveChild == mActiveChild) {
return;
}
nsIFrame* frame = GetPrimaryFrame();
if (frame) {
nsLayoutUtils::PostRestyleEvent(this, RestyleHint{0},
nsChangeHint_InvalidateRenderingObservers);
SVGUtils::ScheduleReflowSVG(frame);
}
mActiveChild = newActiveChild;
}
//----------------------------------------------------------------------
// nsINode methods
NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGSwitchElement)
//----------------------------------------------------------------------
// nsINode methods
void SVGSwitchElement::InsertChildBefore(nsIContent* aKid,
nsIContent* aBeforeThis, bool aNotify,
ErrorResult& aRv) {
SVGSwitchElementBase::InsertChildBefore(aKid, aBeforeThis, aNotify, aRv);
if (aRv.Failed()) {
return;
}
MaybeInvalidate();
}
void SVGSwitchElement::RemoveChildNode(nsIContent* aKid, bool aNotify) {
SVGSwitchElementBase::RemoveChildNode(aKid, aNotify);
MaybeInvalidate();
}
//----------------------------------------------------------------------
// Implementation Helpers:
nsIContent* SVGSwitchElement::FindActiveChild() const {
nsAutoString acceptLangs;
Preferences::GetLocalizedString("intl.accept_languages", acceptLangs);
int32_t bestLanguagePreferenceRank = -1;
nsIContent* bestChild = nullptr;
nsIContent* defaultChild = nullptr;
for (nsIContent* child = nsINode::GetFirstChild(); child;
child = child->GetNextSibling()) {
if (!child->IsElement()) {
continue;
}
nsCOMPtr<SVGTests> tests(do_QueryInterface(child));
if (tests) {
if (tests->PassesConditionalProcessingTestsIgnoringSystemLanguage()) {
int32_t languagePreferenceRank =
tests->GetBestLanguagePreferenceRank(acceptLangs);
switch (languagePreferenceRank) {
case 0:
// best possible match
return child;
case -1:
// no match
break;
case -2:
// no systemLanguage attribute. If there's nothing better
// we'll use the first such child.
if (!defaultChild) {
defaultChild = child;
}
break;
default:
if (bestLanguagePreferenceRank == -1 ||
languagePreferenceRank < bestLanguagePreferenceRank) {
bestLanguagePreferenceRank = languagePreferenceRank;
bestChild = child;
}
break;
}
}
} else if (!bestChild) {
bestChild = child;
}
}
return bestChild ? bestChild : defaultChild;
}
} // namespace mozilla::dom
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