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/**
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2003-2024 Apple Inc. All rights reserved.
* Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
*
* 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 "config.h"
#include "RenderTreeBuilderList.h"
#include "LegacyInlineIterator.h"
#include "LineInlineHeaders.h"
#include "RenderChildIterator.h"
#include "RenderListMarker.h"
#include "RenderMenuList.h"
#include "RenderMultiColumnFlow.h"
#include "RenderObjectStyle.h"
#include "RenderTable.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(RenderTreeBuilder::List);
static std::pair<RenderBlock*, RenderBlock*> findParentOfEmptyOrFirstLineBox(RenderBlock& blockContainer, const RenderListMarker& marker)
{
auto inQuirksMode = blockContainer.document().inQuirksMode();
RenderBlock* fallbackParent = { };
for (auto& child : childrenOfType<RenderObject>(blockContainer)) {
if (&child == &marker)
continue;
if (child.isInline()) {
if (!is<RenderInline>(child) || !isEmptyInline(downcast<RenderInline>(child)))
return { &blockContainer, { } };
fallbackParent = &blockContainer;
}
if (child.isFloating() || child.isOutOfFlowPositioned() || is<RenderMenuList>(child))
continue;
if (auto* renderBox = dynamicDowncast<RenderBox>(child); renderBox && renderBox->isWritingModeRoot())
break;
if (is<RenderListItem>(blockContainer) && inQuirksMode && child.node() && isHTMLListElement(*child.node()))
break;
if (!is<RenderBlock>(child) || is<RenderTable>(child))
break;
auto& blockChild = downcast<RenderBlock>(child);
auto [ nestedParent, nestedFallbackParent ] = findParentOfEmptyOrFirstLineBox(blockChild, marker);
if (nestedParent)
return { nestedParent, { } };
if (!fallbackParent) {
if (nestedFallbackParent)
fallbackParent = nestedFallbackParent;
else if (auto* firstInFlowChild = blockChild.firstInFlowChild(); !firstInFlowChild || firstInFlowChild == &marker)
fallbackParent = &blockChild;
}
}
return { { }, fallbackParent };
}
static RenderBlock* parentCandidateForMarker(RenderListItem& listItemRenderer, const RenderListMarker& marker)
{
if (marker.isInside()) {
if (auto* firstChild = dynamicDowncast<RenderBlock>(listItemRenderer.firstChild())) {
if (!firstChild->isAnonymous())
return &listItemRenderer;
// We may have created this anonymous block for the marker itself. Let's keep it in there.
if (firstChild->firstChild() == &marker && !marker.nextSibling())
return firstChild;
}
return findParentOfEmptyOrFirstLineBox(listItemRenderer, marker).first;
}
auto [parentCandidate, fallbackParent] = findParentOfEmptyOrFirstLineBox(listItemRenderer, marker);
return parentCandidate ? parentCandidate : fallbackParent;
}
static RenderObject* firstNonMarkerChild(RenderBlock& parent)
{
RenderObject* child = parent.firstChild();
while (is<RenderListMarker>(child))
child = child->nextSibling();
return child;
}
RenderTreeBuilder::List::List(RenderTreeBuilder& builder)
: m_builder(builder)
{
}
void RenderTreeBuilder::List::updateItemMarker(RenderListItem& listItemRenderer)
{
auto& style = listItemRenderer.style();
if (RefPtr styleImage = style.listStyleImage().tryStyleImage(); style.listStyleType().isNone() && (!styleImage || styleImage->errorOccurred())) {
if (auto* marker = listItemRenderer.markerRenderer())
m_builder.destroy(*marker);
return;
}
auto newStyle = listItemRenderer.computeMarkerStyle();
if (auto* markerRenderer = listItemRenderer.markerRenderer()) {
markerRenderer->setStyle(WTFMove(newStyle));
auto* currentParent = markerRenderer->parent();
if (!currentParent) {
ASSERT_NOT_REACHED();
return;
}
auto* newParent = parentCandidateForMarker(listItemRenderer, *markerRenderer);
if (!newParent) {
if (currentParent->isAnonymousBlock()) {
// If the marker is currently contained inside an anonymous box. then we are the only item in that anonymous box
// (since no line box parent was found). It's ok to just leave the marker where it is in this case.
return;
}
newParent = &listItemRenderer;
if (auto* multiColumnFlow = listItemRenderer.multiColumnFlow())
newParent = multiColumnFlow;
}
if (newParent == currentParent)
return;
m_builder.attach(*newParent, m_builder.detach(*currentParent, *markerRenderer, WillBeDestroyed::No, RenderTreeBuilder::CanCollapseAnonymousBlock::No), firstNonMarkerChild(*newParent));
// If current parent is an anonymous block that has lost all its children, destroy it.
if (currentParent->isAnonymousBlock() && !currentParent->firstChild() && !downcast<RenderBlock>(*currentParent).continuation())
m_builder.destroy(*currentParent);
return;
}
RenderPtr<RenderListMarker> newMarkerRenderer = WebCore::createRenderer<RenderListMarker>(listItemRenderer, WTFMove(newStyle));
newMarkerRenderer->initializeStyle();
listItemRenderer.setMarkerRenderer(*newMarkerRenderer);
auto* newParent = parentCandidateForMarker(listItemRenderer, *newMarkerRenderer);
if (!newParent) {
// If the marker is currently contained inside an anonymous box,
// then we are the only item in that anonymous box (since no line box
// parent was found). It's ok to just leave the marker where it is
// in this case.
newParent = &listItemRenderer;
if (auto* multiColumnFlow = listItemRenderer.multiColumnFlow())
newParent = multiColumnFlow;
}
m_builder.attach(*newParent, WTFMove(newMarkerRenderer), firstNonMarkerChild(*newParent));
}
}
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