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/*
* Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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/layout/LayoutObjectChildList.h"
#include "core/dom/AXObjectCache.h"
#include "core/layout/LayoutCounter.h"
#include "core/layout/LayoutObject.h"
#include "core/layout/LayoutView.h"
#include "core/paint/PaintLayer.h"
#include "core/style/ComputedStyle.h"
namespace blink {
void LayoutObjectChildList::destroyLeftoverChildren()
{
while (firstChild()) {
// List markers are owned by their enclosing list and so don't get destroyed by this container.
if (firstChild()->isListMarker()) {
firstChild()->remove();
continue;
}
// Destroy any anonymous children remaining in the layout tree, as well as implicit (shadow) DOM elements like those used in the engine-based text fields.
if (firstChild()->node())
firstChild()->node()->setLayoutObject(nullptr);
firstChild()->destroy();
}
}
LayoutObject* LayoutObjectChildList::removeChildNode(LayoutObject* owner, LayoutObject* oldChild, bool notifyLayoutObject)
{
ASSERT(oldChild->parent() == owner);
ASSERT(this == owner->virtualChildren());
if (oldChild->isFloatingOrOutOfFlowPositioned())
toLayoutBox(oldChild)->removeFloatingOrPositionedChildFromBlockLists();
{
// So that we'll get the appropriate dirty bit set (either that a normal flow child got yanked or
// that a positioned child got yanked). We also issue paint invalidations, so that the area exposed when the child
// disappears gets paint invalidated properly.
if (!owner->documentBeingDestroyed() && notifyLayoutObject && oldChild->everHadLayout()) {
oldChild->setNeedsLayoutAndPrefWidthsRecalc(LayoutInvalidationReason::RemovedFromLayout);
invalidatePaintOnRemoval(*oldChild);
}
}
// If we have a line box wrapper, delete it.
if (oldChild->isBox())
toLayoutBox(oldChild)->deleteLineBoxWrapper();
if (!owner->documentBeingDestroyed()) {
// If oldChild is the start or end of the selection, then clear the selection to
// avoid problems of invalid pointers.
// FIXME: The FrameSelection should be responsible for this when it
// is notified of DOM mutations.
if (oldChild->isSelectionBorder())
owner->view()->clearSelection();
owner->notifyOfSubtreeChange();
if (notifyLayoutObject) {
LayoutCounter::layoutObjectSubtreeWillBeDetached(oldChild);
oldChild->willBeRemovedFromTree();
}
}
// WARNING: There should be no code running between willBeRemovedFromTree and the actual removal below.
// This is needed to avoid race conditions where willBeRemovedFromTree would dirty the tree's structure
// and the code running here would force an untimely rebuilding, leaving |oldChild| dangling.
if (oldChild->previousSibling())
oldChild->previousSibling()->setNextSibling(oldChild->nextSibling());
if (oldChild->nextSibling())
oldChild->nextSibling()->setPreviousSibling(oldChild->previousSibling());
if (firstChild() == oldChild)
m_firstChild = oldChild->nextSibling();
if (lastChild() == oldChild)
m_lastChild = oldChild->previousSibling();
oldChild->setPreviousSibling(nullptr);
oldChild->setNextSibling(nullptr);
oldChild->setParent(nullptr);
oldChild->registerSubtreeChangeListenerOnDescendants(oldChild->consumesSubtreeChangeNotification());
if (AXObjectCache* cache = owner->document().existingAXObjectCache())
cache->childrenChanged(owner);
return oldChild;
}
void LayoutObjectChildList::insertChildNode(LayoutObject* owner, LayoutObject* newChild, LayoutObject* beforeChild, bool notifyLayoutObject)
{
ASSERT(!newChild->parent());
ASSERT(this == owner->virtualChildren());
ASSERT(!owner->isLayoutBlockFlow() || (!newChild->isTableSection() && !newChild->isTableRow() && !newChild->isTableCell()));
while (beforeChild && beforeChild->parent() && beforeChild->parent() != owner)
beforeChild = beforeChild->parent();
// This should never happen, but if it does prevent layout tree corruption
// where child->parent() ends up being owner but child->nextSibling()->parent()
// is not owner.
if (beforeChild && beforeChild->parent() != owner) {
ASSERT_NOT_REACHED();
return;
}
newChild->setParent(owner);
if (firstChild() == beforeChild)
m_firstChild = newChild;
if (beforeChild) {
LayoutObject* previousSibling = beforeChild->previousSibling();
if (previousSibling)
previousSibling->setNextSibling(newChild);
newChild->setPreviousSibling(previousSibling);
newChild->setNextSibling(beforeChild);
beforeChild->setPreviousSibling(newChild);
} else {
if (lastChild())
lastChild()->setNextSibling(newChild);
newChild->setPreviousSibling(lastChild());
m_lastChild = newChild;
}
if (!owner->documentBeingDestroyed() && notifyLayoutObject) {
newChild->insertedIntoTree();
LayoutCounter::layoutObjectSubtreeAttached(newChild);
}
// Propagate the need to notify ancestors down into any
// child nodes.
if (owner->hasSubtreeChangeListenerRegistered())
newChild->registerSubtreeChangeListenerOnDescendants(true);
// If the inserted node is currently marked as needing to notify children then
// we have to propagate that mark up the tree.
if (newChild->wasNotifiedOfSubtreeChange())
owner->notifyAncestorsOfSubtreeChange();
newChild->setNeedsLayoutAndPrefWidthsRecalc(LayoutInvalidationReason::AddedToLayout);
newChild->setShouldDoFullPaintInvalidation(PaintInvalidationLayoutObjectInsertion);
if (!owner->normalChildNeedsLayout())
owner->setChildNeedsLayout(); // We may supply the static position for an absolute positioned child.
if (!owner->documentBeingDestroyed())
owner->notifyOfSubtreeChange();
if (AXObjectCache* cache = owner->document().axObjectCache())
cache->childrenChanged(owner);
}
void LayoutObjectChildList::invalidatePaintOnRemoval(LayoutObject& oldChild)
{
if (!oldChild.isRooted())
return;
if (oldChild.isBody()) {
oldChild.view()->setShouldDoFullPaintInvalidation();
return;
}
oldChild.enclosingLayer()->setNeedsRepaint();
oldChild.invalidatePaintOfPreviousPaintInvalidationRect(oldChild.containerForPaintInvalidation(), PaintInvalidationLayoutObjectRemoval);
}
} // namespace blink
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