gecko/dom/html/HTMLShadowElement.cpp
2015-05-03 15:32:37 -04:00

353 lines
12 KiB
C++

/* -*- 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/ShadowRoot.h"
#include "ChildIterator.h"
#include "nsContentUtils.h"
#include "mozilla/dom/HTMLShadowElement.h"
#include "mozilla/dom/HTMLShadowElementBinding.h"
NS_IMPL_NS_NEW_HTML_ELEMENT(Shadow)
using namespace mozilla::dom;
HTMLShadowElement::HTMLShadowElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: nsGenericHTMLElement(aNodeInfo), mIsInsertionPoint(false)
{
}
HTMLShadowElement::~HTMLShadowElement()
{
if (mProjectedShadow) {
mProjectedShadow->RemoveMutationObserver(this);
}
}
NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLShadowElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLShadowElement,
nsGenericHTMLElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mProjectedShadow)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLShadowElement,
nsGenericHTMLElement)
if (tmp->mProjectedShadow) {
tmp->mProjectedShadow->RemoveMutationObserver(tmp);
tmp->mProjectedShadow = nullptr;
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_ADDREF_INHERITED(HTMLShadowElement, Element)
NS_IMPL_RELEASE_INHERITED(HTMLShadowElement, Element)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(HTMLShadowElement)
NS_INTERFACE_MAP_END_INHERITING(nsGenericHTMLElement)
NS_IMPL_ELEMENT_CLONE(HTMLShadowElement)
JSObject*
HTMLShadowElement::WrapNode(JSContext *aCx, JS::Handle<JSObject*> aGivenProto)
{
return HTMLShadowElementBinding::Wrap(aCx, this, aGivenProto);
}
void
HTMLShadowElement::SetProjectedShadow(ShadowRoot* aProjectedShadow)
{
if (mProjectedShadow) {
mProjectedShadow->RemoveMutationObserver(this);
// The currently projected ShadowRoot is going away,
// thus the destination insertion points need to be updated.
ExplicitChildIterator childIterator(mProjectedShadow);
for (nsIContent* content = childIterator.GetNextChild();
content;
content = childIterator.GetNextChild()) {
ShadowRoot::RemoveDestInsertionPoint(this, content->DestInsertionPoints());
}
}
mProjectedShadow = aProjectedShadow;
if (mProjectedShadow) {
// A new ShadowRoot is being projected, thus its explcit
// children will be distributed to this shadow insertion point.
ExplicitChildIterator childIterator(mProjectedShadow);
for (nsIContent* content = childIterator.GetNextChild();
content;
content = childIterator.GetNextChild()) {
content->DestInsertionPoints().AppendElement(this);
}
// Watch for mutations on the projected shadow because
// it affects the nodes that are distributed to this shadow
// insertion point.
mProjectedShadow->AddMutationObserver(this);
}
}
static bool
IsInFallbackContent(nsIContent* aContent)
{
nsINode* parentNode = aContent->GetParentNode();
while (parentNode) {
if (parentNode->IsHTMLElement(nsGkAtoms::content)) {
return true;
}
parentNode = parentNode->GetParentNode();
}
return false;
}
nsresult
HTMLShadowElement::BindToTree(nsIDocument* aDocument,
nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers)
{
nsRefPtr<ShadowRoot> oldContainingShadow = GetContainingShadow();
nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
aBindingParent,
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv, rv);
ShadowRoot* containingShadow = GetContainingShadow();
if (containingShadow && !oldContainingShadow) {
// Keep track of all descendant <shadow> elements in tree order so
// that when the current shadow insertion point is removed, the next
// one can be found quickly.
TreeOrderComparator comparator;
containingShadow->ShadowDescendants().InsertElementSorted(this, comparator);
if (containingShadow->ShadowDescendants()[0] != this) {
// Only the first <shadow> (in tree order) of a ShadowRoot can be an insertion point.
return NS_OK;
}
if (IsInFallbackContent(this)) {
// If the first shadow element in tree order is invalid (in fallback content),
// the containing ShadowRoot will not have a shadow insertion point.
containingShadow->SetShadowElement(nullptr);
} else {
mIsInsertionPoint = true;
containingShadow->SetShadowElement(this);
}
containingShadow->SetInsertionPointChanged();
}
if (mIsInsertionPoint && containingShadow) {
// Propagate BindToTree calls to projected shadow root children.
ShadowRoot* projectedShadow = containingShadow->GetOlderShadowRoot();
if (projectedShadow) {
projectedShadow->SetIsComposedDocParticipant(IsInComposedDoc());
for (nsIContent* child = projectedShadow->GetFirstChild(); child;
child = child->GetNextSibling()) {
rv = child->BindToTree(nullptr, projectedShadow,
projectedShadow->GetBindingParent(),
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv, rv);
}
}
}
return NS_OK;
}
void
HTMLShadowElement::UnbindFromTree(bool aDeep, bool aNullParent)
{
nsRefPtr<ShadowRoot> oldContainingShadow = GetContainingShadow();
if (mIsInsertionPoint && oldContainingShadow) {
// Propagate UnbindFromTree call to previous projected shadow
// root children.
ShadowRoot* projectedShadow = oldContainingShadow->GetOlderShadowRoot();
if (projectedShadow) {
for (nsIContent* child = projectedShadow->GetFirstChild(); child;
child = child->GetNextSibling()) {
child->UnbindFromTree(true, false);
}
projectedShadow->SetIsComposedDocParticipant(false);
}
}
nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);
if (oldContainingShadow && !GetContainingShadow() && mIsInsertionPoint) {
nsTArray<HTMLShadowElement*>& shadowDescendants =
oldContainingShadow->ShadowDescendants();
shadowDescendants.RemoveElement(this);
oldContainingShadow->SetShadowElement(nullptr);
// Find the next shadow insertion point.
if (shadowDescendants.Length() > 0 &&
!IsInFallbackContent(shadowDescendants[0])) {
oldContainingShadow->SetShadowElement(shadowDescendants[0]);
}
oldContainingShadow->SetInsertionPointChanged();
mIsInsertionPoint = false;
}
}
void
HTMLShadowElement::DistributeSingleNode(nsIContent* aContent)
{
if (aContent->DestInsertionPoints().Contains(this)) {
// Node has already been distrbuted this this node,
// we are done.
return;
}
aContent->DestInsertionPoints().AppendElement(this);
// Handle the case where the shadow element is a child of
// a node with a ShadowRoot. The nodes that have been distributed to
// this shadow insertion point will need to be reprojected into the
// insertion points of the parent's ShadowRoot.
ShadowRoot* parentShadowRoot = GetParent()->GetShadowRoot();
if (parentShadowRoot) {
parentShadowRoot->DistributeSingleNode(aContent);
return;
}
// Handle the case where the parent of this shadow element is a ShadowRoot
// that is projected into a shadow insertion point in the younger ShadowRoot.
ShadowRoot* containingShadow = GetContainingShadow();
ShadowRoot* youngerShadow = containingShadow->GetYoungerShadowRoot();
if (youngerShadow && GetParent() == containingShadow) {
HTMLShadowElement* youngerShadowElement = youngerShadow->GetShadowElement();
if (youngerShadowElement) {
youngerShadowElement->DistributeSingleNode(aContent);
}
}
}
void
HTMLShadowElement::RemoveDistributedNode(nsIContent* aContent)
{
ShadowRoot::RemoveDestInsertionPoint(this, aContent->DestInsertionPoints());
// Handle the case where the shadow element is a child of
// a node with a ShadowRoot. The nodes that have been distributed to
// this shadow insertion point will need to be removed from the
// insertion points of the parent's ShadowRoot.
ShadowRoot* parentShadowRoot = GetParent()->GetShadowRoot();
if (parentShadowRoot) {
parentShadowRoot->RemoveDistributedNode(aContent);
return;
}
// Handle the case where the parent of this shadow element is a ShadowRoot
// that is projected into a shadow insertion point in the younger ShadowRoot.
ShadowRoot* containingShadow = GetContainingShadow();
ShadowRoot* youngerShadow = containingShadow->GetYoungerShadowRoot();
if (youngerShadow && GetParent() == containingShadow) {
HTMLShadowElement* youngerShadowElement = youngerShadow->GetShadowElement();
if (youngerShadowElement) {
youngerShadowElement->RemoveDistributedNode(aContent);
}
}
}
void
HTMLShadowElement::DistributeAllNodes()
{
// All the explicit children of the projected ShadowRoot are distributed
// into this shadow insertion point so update the destination insertion
// points.
ShadowRoot* containingShadow = GetContainingShadow();
ShadowRoot* olderShadow = containingShadow->GetOlderShadowRoot();
if (olderShadow) {
ExplicitChildIterator childIterator(olderShadow);
for (nsIContent* content = childIterator.GetNextChild();
content;
content = childIterator.GetNextChild()) {
ShadowRoot::RemoveDestInsertionPoint(this, content->DestInsertionPoints());
content->DestInsertionPoints().AppendElement(this);
}
}
// Handle the case where the shadow element is a child of
// a node with a ShadowRoot. The nodes that have been distributed to
// this shadow insertion point will need to be reprojected into the
// insertion points of the parent's ShadowRoot.
ShadowRoot* parentShadowRoot = GetParent()->GetShadowRoot();
if (parentShadowRoot) {
parentShadowRoot->DistributeAllNodes();
return;
}
// Handle the case where the parent of this shadow element is a ShadowRoot
// that is projected into a shadow insertion point in the younger ShadowRoot.
ShadowRoot* youngerShadow = containingShadow->GetYoungerShadowRoot();
if (youngerShadow && GetParent() == containingShadow) {
HTMLShadowElement* youngerShadowElement = youngerShadow->GetShadowElement();
if (youngerShadowElement) {
youngerShadowElement->DistributeAllNodes();
}
}
}
void
HTMLShadowElement::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
// Watch for content appended to the projected shadow (the ShadowRoot that
// will be rendered in place of this shadow insertion point) because the
// nodes may need to be distributed into other insertion points.
nsIContent* currentChild = aFirstNewContent;
while (currentChild) {
if (ShadowRoot::IsPooledNode(currentChild, aContainer, mProjectedShadow)) {
DistributeSingleNode(currentChild);
}
currentChild = currentChild->GetNextSibling();
}
}
void
HTMLShadowElement::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
// Watch for content appended to the projected shadow (the ShadowRoot that
// will be rendered in place of this shadow insertion point) because the
// nodes may need to be distributed into other insertion points.
if (!ShadowRoot::IsPooledNode(aChild, aContainer, mProjectedShadow)) {
return;
}
DistributeSingleNode(aChild);
}
void
HTMLShadowElement::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
// Watch for content removed from the projected shadow (the ShadowRoot that
// will be rendered in place of this shadow insertion point) because the
// nodes may need to be removed from other insertion points.
if (!ShadowRoot::IsPooledNode(aChild, aContainer, mProjectedShadow)) {
return;
}
RemoveDistributedNode(aChild);
}