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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
* rights reserved.
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
* (http://www.torchmobile.com/)
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "core/dom/LayoutTreeBuilder.h"
#include "core/HTMLNames.h"
#include "core/SVGNames.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/FirstLetterPseudoElement.h"
#include "core/dom/Fullscreen.h"
#include "core/dom/Node.h"
#include "core/dom/PseudoElement.h"
#include "core/dom/Text.h"
#include "core/dom/shadow/InsertionPoint.h"
#include "core/layout/LayoutFullScreen.h"
#include "core/layout/LayoutObject.h"
#include "core/layout/LayoutText.h"
#include "core/layout/LayoutView.h"
#include "core/svg/SVGElement.h"
#include "platform/RuntimeEnabledFeatures.h"
namespace blink {
LayoutTreeBuilderForElement::LayoutTreeBuilderForElement(Element& element,
ComputedStyle* style)
: LayoutTreeBuilder(element, nullptr), m_style(style) {
DCHECK(!element.isActiveSlotOrActiveInsertionPoint());
if (element.isFirstLetterPseudoElement()) {
if (LayoutObject* nextLayoutObject =
FirstLetterPseudoElement::firstLetterTextLayoutObject(element))
m_layoutObjectParent = nextLayoutObject->parent();
} else if (ContainerNode* containerNode =
LayoutTreeBuilderTraversal::parent(element)) {
m_layoutObjectParent = containerNode->layoutObject();
}
}
LayoutObject* LayoutTreeBuilderForElement::nextLayoutObject() const {
DCHECK(m_layoutObjectParent);
if (m_node->isInTopLayer())
return LayoutTreeBuilderTraversal::nextInTopLayer(*m_node);
if (m_node->isFirstLetterPseudoElement())
return FirstLetterPseudoElement::firstLetterTextLayoutObject(*m_node);
return LayoutTreeBuilder::nextLayoutObject();
}
LayoutObject* LayoutTreeBuilderForElement::parentLayoutObject() const {
if (m_layoutObjectParent) {
// FIXME: Guarding this by parentLayoutObject isn't quite right as the spec
// for top layer only talks about display: none ancestors so putting a
// <dialog> inside an <optgroup> seems like it should still work even though
// this check will prevent it.
if (m_node->isInTopLayer())
return m_node->document().layoutView();
}
return m_layoutObjectParent;
}
DISABLE_CFI_PERF
bool LayoutTreeBuilderForElement::shouldCreateLayoutObject() const {
if (!m_layoutObjectParent)
return false;
// FIXME: Should the following be in SVGElement::layoutObjectIsNeeded()?
if (m_node->isSVGElement()) {
// SVG elements only render when inside <svg>, or if the element is an <svg>
// itself.
if (!isSVGSVGElement(*m_node) &&
(!m_layoutObjectParent->node() ||
!m_layoutObjectParent->node()->isSVGElement()))
return false;
if (!toSVGElement(m_node)->isValid())
return false;
}
LayoutObject* parentLayoutObject = this->parentLayoutObject();
if (!parentLayoutObject)
return false;
if (!parentLayoutObject->canHaveChildren())
return false;
return m_node->layoutObjectIsNeeded(style());
}
ComputedStyle& LayoutTreeBuilderForElement::style() const {
if (!m_style)
m_style = m_node->styleForLayoutObject();
return *m_style;
}
DISABLE_CFI_PERF
void LayoutTreeBuilderForElement::createLayoutObject() {
ComputedStyle& style = this->style();
LayoutObject* newLayoutObject = m_node->createLayoutObject(style);
if (!newLayoutObject)
return;
LayoutObject* parentLayoutObject = this->parentLayoutObject();
if (!parentLayoutObject->isChildAllowed(newLayoutObject, style)) {
newLayoutObject->destroy();
return;
}
// Make sure the LayoutObject already knows it is going to be added to a
// LayoutFlowThread before we set the style for the first time. Otherwise code
// using inLayoutFlowThread() in the styleWillChange and styleDidChange will
// fail.
newLayoutObject->setIsInsideFlowThread(
parentLayoutObject->isInsideFlowThread());
LayoutObject* nextLayoutObject = this->nextLayoutObject();
m_node->setLayoutObject(newLayoutObject);
newLayoutObject->setStyle(
&style); // setStyle() can depend on layoutObject() already being set.
if (Fullscreen::isCurrentFullScreenElement(*m_node)) {
newLayoutObject = LayoutFullScreen::wrapLayoutObject(
newLayoutObject, parentLayoutObject, &m_node->document());
if (!newLayoutObject)
return;
}
// Note: Adding newLayoutObject instead of layoutObject(). layoutObject() may
// be a child of newLayoutObject.
parentLayoutObject->addChild(newLayoutObject, nextLayoutObject);
}
void LayoutTreeBuilderForText::createLayoutObject() {
ComputedStyle& style = m_layoutObjectParent->mutableStyleRef();
DCHECK(m_node->textLayoutObjectIsNeeded(style, *m_layoutObjectParent));
LayoutText* newLayoutObject = m_node->createTextLayoutObject(style);
if (!m_layoutObjectParent->isChildAllowed(newLayoutObject, style)) {
newLayoutObject->destroy();
return;
}
// Make sure the LayoutObject already knows it is going to be added to a
// LayoutFlowThread before we set the style for the first time. Otherwise code
// using inLayoutFlowThread() in the styleWillChange and styleDidChange will
// fail.
newLayoutObject->setIsInsideFlowThread(
m_layoutObjectParent->isInsideFlowThread());
LayoutObject* nextLayoutObject = this->nextLayoutObject();
m_node->setLayoutObject(newLayoutObject);
// Parent takes care of the animations, no need to call setAnimatableStyle.
newLayoutObject->setStyle(&style);
m_layoutObjectParent->addChild(newLayoutObject, nextLayoutObject);
}
} // namespace blink
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