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/*
* Copyright (C) 2017 Apple 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:
* 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 INC. AND ITS 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 APPLE INC. OR ITS 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 "config.h"
#include "RenderTreeUpdaterGeneratedContent.h"
#include "ContentData.h"
#include "InspectorInstrumentation.h"
#include "PseudoElement.h"
#include "RenderDescendantIterator.h"
#include "RenderElement.h"
#include "RenderImage.h"
#include "RenderQuote.h"
#include "RenderTreeUpdater.h"
#include "RenderView.h"
#include "StyleTreeResolver.h"
namespace WebCore {
RenderTreeUpdater::GeneratedContent::GeneratedContent(RenderTreeUpdater& updater)
: m_updater(updater)
{
}
void RenderTreeUpdater::GeneratedContent::updateRemainingQuotes()
{
if (!m_updater.renderView().hasQuotesNeedingUpdate())
return;
updateQuotesUpTo(nullptr);
m_previousUpdatedQuote = nullptr;
m_updater.renderView().setHasQuotesNeedingUpdate(false);
}
void RenderTreeUpdater::GeneratedContent::updateQuotesUpTo(RenderQuote* lastQuote)
{
auto quoteRenderers = descendantsOfType<RenderQuote>(m_updater.renderView());
auto it = m_previousUpdatedQuote ? ++quoteRenderers.at(*m_previousUpdatedQuote) : quoteRenderers.begin();
auto end = quoteRenderers.end();
for (; it != end; ++it) {
auto& quote = *it;
// Quote character depends on quote depth so we chain the updates.
quote.updateRenderer(m_updater.m_builder, m_previousUpdatedQuote.get());
m_previousUpdatedQuote = quote;
if (&quote == lastQuote)
return;
}
ASSERT(!lastQuote || m_updater.m_builder.hasBrokenContinuation());
}
static bool elementIsTargetedByKeyframeEffectRequiringPseudoElement(const Element* element, PseudoId pseudoId)
{
if (is<PseudoElement>(element))
return elementIsTargetedByKeyframeEffectRequiringPseudoElement(downcast<PseudoElement>(*element).hostElement(), pseudoId);
if (element) {
if (auto* stack = element->keyframeEffectStack(pseudoId))
return stack->requiresPseudoElement();
}
return false;
}
static void createContentRenderers(RenderTreeBuilder& builder, RenderElement& pseudoRenderer, const RenderStyle& style, PseudoId pseudoId)
{
if (auto* contentData = style.contentData()) {
for (const ContentData* content = contentData; content; content = content->next()) {
auto child = content->createContentRenderer(pseudoRenderer.document(), style);
if (pseudoRenderer.isChildAllowed(*child, style))
builder.attach(pseudoRenderer, WTFMove(child));
}
} else {
// The only valid scenario where this method is called without the "content" property being set
// is the case where a pseudo-element has animations set on it via the Web Animations API.
ASSERT_UNUSED(pseudoId, elementIsTargetedByKeyframeEffectRequiringPseudoElement(pseudoRenderer.element(), pseudoId));
}
}
static void updateStyleForContentRenderers(RenderElement& pseudoRenderer, const RenderStyle& style)
{
for (auto& contentRenderer : descendantsOfType<RenderElement>(pseudoRenderer)) {
// We only manage the style for the generated content which must be images or text.
if (!is<RenderImage>(contentRenderer) && !is<RenderQuote>(contentRenderer))
continue;
contentRenderer.setStyle(RenderStyle::createStyleInheritingFromPseudoStyle(style));
}
}
void RenderTreeUpdater::GeneratedContent::updatePseudoElement(Element& current, const Style::ElementUpdate& elementUpdate, PseudoId pseudoId)
{
PseudoElement* pseudoElement = pseudoId == PseudoId::Before ? current.beforePseudoElement() : current.afterPseudoElement();
if (auto* renderer = pseudoElement ? pseudoElement->renderer() : nullptr)
m_updater.renderTreePosition().invalidateNextSibling(*renderer);
auto* updateStyle = elementUpdate.style ? elementUpdate.style->getCachedPseudoStyle(pseudoId) : nullptr;
if (!needsPseudoElement(updateStyle) && !elementIsTargetedByKeyframeEffectRequiringPseudoElement(&current, pseudoId)) {
if (pseudoElement) {
if (pseudoId == PseudoId::Before)
removeBeforePseudoElement(current, m_updater.m_builder);
else
removeAfterPseudoElement(current, m_updater.m_builder);
}
return;
}
if (!updateStyle)
return;
auto* existingStyle = pseudoElement ? pseudoElement->renderOrDisplayContentsStyle() : nullptr;
auto styleChange = existingStyle ? Style::determineChange(*updateStyle, *existingStyle) : Style::Change::Renderer;
if (styleChange == Style::Change::None)
return;
pseudoElement = &current.ensurePseudoElement(pseudoId);
if (updateStyle->display() == DisplayType::Contents) {
// For display:contents we create an inline wrapper that inherits its
// style from the display:contents style.
auto contentsStyle = RenderStyle::createPtr();
contentsStyle->setStyleType(pseudoId);
contentsStyle->inheritFrom(*updateStyle);
contentsStyle->copyContentFrom(*updateStyle);
contentsStyle->copyPseudoElementsFrom(*updateStyle);
Style::ElementUpdate contentsUpdate { WTFMove(contentsStyle), styleChange, elementUpdate.recompositeLayer };
m_updater.updateElementRenderer(*pseudoElement, WTFMove(contentsUpdate));
auto pseudoElementUpdateStyle = RenderStyle::cloneIncludingPseudoElements(*updateStyle);
pseudoElement->storeDisplayContentsStyle(makeUnique<RenderStyle>(WTFMove(pseudoElementUpdateStyle)));
} else {
auto pseudoElementUpdateStyle = RenderStyle::cloneIncludingPseudoElements(*updateStyle);
Style::ElementUpdate pseudoElementUpdate { makeUnique<RenderStyle>(WTFMove(pseudoElementUpdateStyle)), styleChange, elementUpdate.recompositeLayer };
m_updater.updateElementRenderer(*pseudoElement, WTFMove(pseudoElementUpdate));
ASSERT(!pseudoElement->hasDisplayContents());
}
auto* pseudoElementRenderer = pseudoElement->renderer();
if (!pseudoElementRenderer)
return;
if (styleChange == Style::Change::Renderer)
createContentRenderers(m_updater.m_builder, *pseudoElementRenderer, *updateStyle, pseudoId);
else
updateStyleForContentRenderers(*pseudoElementRenderer, *updateStyle);
if (m_updater.renderView().hasQuotesNeedingUpdate()) {
for (auto& child : descendantsOfType<RenderQuote>(*pseudoElementRenderer))
updateQuotesUpTo(&child);
}
m_updater.m_builder.updateAfterDescendants(*pseudoElementRenderer);
}
void RenderTreeUpdater::GeneratedContent::updateBackdropRenderer(RenderElement& renderer)
{
// ::backdrop does not inherit style, hence using the view style as parent style
auto style = renderer.getCachedPseudoStyle(PseudoId::Backdrop, &renderer.view().style());
// Destroy ::backdrop if new element no longer is in top layer, or if it is hidden
if ((renderer.element() && !renderer.element()->isInTopLayer()) || !style || style->display() == DisplayType::None) {
if (WeakPtr backdropRenderer = renderer.backdropRenderer())
m_updater.m_builder.destroy(*backdropRenderer);
return;
}
auto newStyle = RenderStyle::clone(*style);
if (auto backdropRenderer = renderer.backdropRenderer())
backdropRenderer->setStyle(WTFMove(newStyle));
else {
auto newBackdropRenderer = WebCore::createRenderer<RenderBlockFlow>(renderer.document(), WTFMove(newStyle));
newBackdropRenderer->initializeStyle();
renderer.setBackdropRenderer(*newBackdropRenderer.get());
m_updater.m_builder.attach(renderer, WTFMove(newBackdropRenderer), renderer.firstChild());
}
}
bool RenderTreeUpdater::GeneratedContent::needsPseudoElement(const RenderStyle* style)
{
if (!style)
return false;
if (!m_updater.renderTreePosition().parent().canHaveGeneratedChildren())
return false;
if (!pseudoElementRendererIsNeeded(style))
return false;
return true;
}
void RenderTreeUpdater::GeneratedContent::removeBeforePseudoElement(Element& element, RenderTreeBuilder& builder)
{
auto* pseudoElement = element.beforePseudoElement();
if (!pseudoElement)
return;
tearDownRenderers(*pseudoElement, TeardownType::Full, builder);
element.clearBeforePseudoElement();
}
void RenderTreeUpdater::GeneratedContent::removeAfterPseudoElement(Element& element, RenderTreeBuilder& builder)
{
auto* pseudoElement = element.afterPseudoElement();
if (!pseudoElement)
return;
tearDownRenderers(*pseudoElement, TeardownType::Full, builder);
element.clearAfterPseudoElement();
}
}