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/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "core/dom/PseudoElement.h"
#include "core/dom/FirstLetterPseudoElement.h"
#include "core/frame/UseCounter.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/layout/LayoutObject.h"
#include "core/layout/LayoutQuote.h"
#include "core/style/ContentData.h"
namespace blink {
PseudoElement* PseudoElement::create(Element* parent, PseudoId pseudoId) {
return new PseudoElement(parent, pseudoId);
}
const QualifiedName& pseudoElementTagName(PseudoId pseudoId) {
switch (pseudoId) {
case PseudoIdAfter: {
DEFINE_STATIC_LOCAL(QualifiedName, after,
(nullAtom, "<pseudo:after>", nullAtom));
return after;
}
case PseudoIdBefore: {
DEFINE_STATIC_LOCAL(QualifiedName, before,
(nullAtom, "<pseudo:before>", nullAtom));
return before;
}
case PseudoIdBackdrop: {
DEFINE_STATIC_LOCAL(QualifiedName, backdrop,
(nullAtom, "<pseudo:backdrop>", nullAtom));
return backdrop;
}
case PseudoIdFirstLetter: {
DEFINE_STATIC_LOCAL(QualifiedName, firstLetter,
(nullAtom, "<pseudo:first-letter>", nullAtom));
return firstLetter;
}
default:
NOTREACHED();
}
DEFINE_STATIC_LOCAL(QualifiedName, name, (nullAtom, "<pseudo>", nullAtom));
return name;
}
String PseudoElement::pseudoElementNameForEvents(PseudoId pseudoId) {
DEFINE_STATIC_LOCAL(const String, after, ("::after"));
DEFINE_STATIC_LOCAL(const String, before, ("::before"));
switch (pseudoId) {
case PseudoIdAfter:
return after;
case PseudoIdBefore:
return before;
default:
return emptyString();
}
}
PseudoElement::PseudoElement(Element* parent, PseudoId pseudoId)
: Element(pseudoElementTagName(pseudoId),
&parent->document(),
CreateElement),
m_pseudoId(pseudoId) {
DCHECK_NE(pseudoId, PseudoIdNone);
parent->treeScope().adoptIfNeeded(*this);
setParentOrShadowHostNode(parent);
setHasCustomStyleCallbacks();
if ((pseudoId == PseudoIdBefore || pseudoId == PseudoIdAfter) &&
parent->hasTagName(HTMLNames::inputTag))
UseCounter::count(parent->document(),
UseCounter::PseudoBeforeAfterForInputElement);
}
PassRefPtr<ComputedStyle> PseudoElement::customStyleForLayoutObject() {
return parentOrShadowHostElement()->layoutObject()->getCachedPseudoStyle(
m_pseudoId);
}
void PseudoElement::dispose() {
DCHECK(parentOrShadowHostElement());
InspectorInstrumentation::pseudoElementDestroyed(this);
DCHECK(!nextSibling());
DCHECK(!previousSibling());
detachLayoutTree();
Element* parent = parentOrShadowHostElement();
document().adoptIfNeeded(*this);
setParentOrShadowHostNode(0);
removedFrom(parent);
}
void PseudoElement::attachLayoutTree(const AttachContext& context) {
DCHECK(!layoutObject());
Element::attachLayoutTree(context);
LayoutObject* layoutObject = this->layoutObject();
if (!layoutObject)
return;
ComputedStyle& style = layoutObject->mutableStyleRef();
if (style.styleType() != PseudoIdBefore && style.styleType() != PseudoIdAfter)
return;
DCHECK(style.contentData());
for (const ContentData* content = style.contentData(); content;
content = content->next()) {
LayoutObject* child = content->createLayoutObject(document(), style);
if (layoutObject->isChildAllowed(child, style)) {
layoutObject->addChild(child);
if (child->isQuote())
toLayoutQuote(child)->attachQuote();
} else {
child->destroy();
}
}
}
bool PseudoElement::layoutObjectIsNeeded(const ComputedStyle& style) {
return pseudoElementLayoutObjectIsNeeded(&style);
}
void PseudoElement::didRecalcStyle(StyleRecalcChange) {
if (!layoutObject())
return;
// The layoutObjects inside pseudo elements are anonymous so they don't get
// notified of recalcStyle and must have the style propagated downward
// manually similar to LayoutObject::propagateStyleToAnonymousChildren.
LayoutObject* layoutObject = this->layoutObject();
for (LayoutObject* child = layoutObject->nextInPreOrder(layoutObject); child;
child = child->nextInPreOrder(layoutObject)) {
// We only manage the style for the generated content items.
if (!child->isText() && !child->isQuote() && !child->isImage())
continue;
child->setPseudoStyle(layoutObject->mutableStyle());
}
}
// With PseudoElements the DOM tree and Layout tree can differ. When you attach
// a, first-letter for example, into the DOM we walk down the Layout
// tree to find the correct insertion point for the LayoutObject. But, this
// means if we ask for the parentOrShadowHost Node from the first-letter
// pseudo element we will get some arbitrary ancestor of the LayoutObject.
//
// For hit testing, we need the parent Node of the LayoutObject for the
// first-letter pseudo element. So, by walking up the Layout tree we know
// we will get the parent and not some other ancestor.
Node* PseudoElement::findAssociatedNode() const {
// The ::backdrop element is parented to the LayoutView, not to the node
// that it's associated with. We need to make sure ::backdrop sends the
// events to the parent node correctly.
if (getPseudoId() == PseudoIdBackdrop)
return parentOrShadowHostNode();
DCHECK(layoutObject());
DCHECK(layoutObject()->parent());
// We can have any number of anonymous layout objects inserted between
// us and our parent so make sure we skip over them.
LayoutObject* ancestor = layoutObject()->parent();
while (ancestor->isAnonymous() ||
(ancestor->node() && ancestor->node()->isPseudoElement())) {
DCHECK(ancestor->parent());
ancestor = ancestor->parent();
}
return ancestor->node();
}
} // namespace blink
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