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/*
* Copyright (C) 2018 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 "LayoutState.h"
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
#include "BlockFormattingContext.h"
#include "BlockFormattingState.h"
#include "BlockInvalidation.h"
#include "DisplayBox.h"
#include "InlineFormattingContext.h"
#include "InlineFormattingState.h"
#include "InlineInvalidation.h"
#include "Invalidation.h"
#include "LayoutBox.h"
#include "LayoutContainer.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_ISO_ALLOCATED_IMPL(LayoutState);
LayoutState::LayoutState(const Container& initialContainingBlock)
: m_initialContainingBlock(makeWeakPtr(initialContainingBlock))
{
// LayoutState is always initiated with the ICB.
ASSERT(!initialContainingBlock.parent());
ASSERT(initialContainingBlock.establishesBlockFormattingContext());
auto& displayBox = displayBoxForLayoutBox(initialContainingBlock);
displayBox.setHorizontalMargin({ });
displayBox.setHorizontalComputedMargin({ });
displayBox.setVerticalMargin({ });
displayBox.setBorder({ });
displayBox.setPadding({ });
displayBox.setTopLeft({ });
displayBox.setContentBoxHeight(initialContainingBlock.style().logicalHeight().value());
displayBox.setContentBoxWidth(initialContainingBlock.style().logicalWidth().value());
m_formattingContextRootListForLayout.add(&initialContainingBlock);
}
void LayoutState::updateLayout()
{
ASSERT(!m_formattingContextRootListForLayout.isEmpty());
for (auto* layoutRoot : m_formattingContextRootListForLayout)
layoutFormattingContextSubtree(*layoutRoot);
m_formattingContextRootListForLayout.clear();
}
void LayoutState::layoutFormattingContextSubtree(const Box& layoutRoot)
{
RELEASE_ASSERT(layoutRoot.establishesFormattingContext());
auto formattingContext = createFormattingContext(layoutRoot);
formattingContext->layout();
formattingContext->layoutOutOfFlowDescendants(layoutRoot);
}
Display::Box& LayoutState::displayBoxForLayoutBox(const Box& layoutBox) const
{
return *m_layoutToDisplayBox.ensure(&layoutBox, [&layoutBox] {
return std::make_unique<Display::Box>(layoutBox.style());
}).iterator->value;
}
void LayoutState::styleChanged(const Box& layoutBox, StyleDiff styleDiff)
{
auto& formattingState = formattingStateForBox(layoutBox);
const Container* invalidationRoot = nullptr;
if (is<BlockFormattingState>(formattingState))
invalidationRoot = BlockInvalidation::invalidate(layoutBox, styleDiff, *this, downcast<BlockFormattingState>(formattingState)).root;
else if (is<InlineFormattingState>(formattingState))
invalidationRoot = InlineInvalidation::invalidate(layoutBox, styleDiff, *this, downcast<InlineFormattingState>(formattingState)).root;
else
ASSERT_NOT_IMPLEMENTED_YET();
ASSERT(invalidationRoot);
m_formattingContextRootListForLayout.addVoid(invalidationRoot);
}
void LayoutState::markNeedsUpdate(const Box&, OptionSet<UpdateType>)
{
}
FormattingState& LayoutState::formattingStateForBox(const Box& layoutBox) const
{
auto& root = layoutBox.formattingContextRoot();
RELEASE_ASSERT(m_formattingStates.contains(&root));
return *m_formattingStates.get(&root);
}
FormattingState& LayoutState::establishedFormattingState(const Box& formattingRoot) const
{
ASSERT(formattingRoot.establishesFormattingContext());
RELEASE_ASSERT(m_formattingStates.contains(&formattingRoot));
return *m_formattingStates.get(&formattingRoot);
}
FormattingState& LayoutState::createFormattingStateForFormattingRootIfNeeded(const Box& formattingRoot)
{
ASSERT(formattingRoot.establishesFormattingContext());
if (formattingRoot.establishesInlineFormattingContext()) {
return *m_formattingStates.ensure(&formattingRoot, [&] {
// If the block container box that initiates this inline formatting context also establishes a block context, the floats outside of the formatting root
// should not interfere with the content inside.
// <div style="float: left"></div><div style="overflow: hidden"> <- is a non-intrusive float, because overflow: hidden triggers new block formatting context.</div>
if (formattingRoot.establishesBlockFormattingContext())
return std::make_unique<InlineFormattingState>(FloatingState::create(*this, formattingRoot), *this);
// Otherwise, the formatting context inherits the floats from the parent formatting context.
// Find the formatting state in which this formatting root lives, not the one it creates and use its floating state.
return std::make_unique<InlineFormattingState>(formattingStateForBox(formattingRoot).floatingState(), *this);
}).iterator->value;
}
if (formattingRoot.establishesBlockFormattingContext()) {
return *m_formattingStates.ensure(&formattingRoot, [&] {
// Block formatting context always establishes a new floating state.
return std::make_unique<BlockFormattingState>(FloatingState::create(*this, formattingRoot), *this);
}).iterator->value;
}
CRASH();
}
std::unique_ptr<FormattingContext> LayoutState::createFormattingContext(const Box& formattingContextRoot)
{
ASSERT(formattingContextRoot.establishesFormattingContext());
if (formattingContextRoot.establishesInlineFormattingContext()) {
auto& inlineFormattingState = downcast<InlineFormattingState>(createFormattingStateForFormattingRootIfNeeded(formattingContextRoot));
return std::make_unique<InlineFormattingContext>(formattingContextRoot, inlineFormattingState);
}
if (formattingContextRoot.establishesBlockFormattingContext()) {
ASSERT(formattingContextRoot.establishesBlockFormattingContextOnly());
auto& blockFormattingState = downcast<BlockFormattingState>(createFormattingStateForFormattingRootIfNeeded(formattingContextRoot));
return std::make_unique<BlockFormattingContext>(formattingContextRoot, blockFormattingState);
}
CRASH();
}
}
}
#endif