blob: 66662d8b89361ecc306bd93df6d464d46779c238 [file] [log] [blame]
/*
* 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 "DisplayBox.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& root)
: m_root(makeWeakPtr(root))
{
// It makes absolutely no sense to construct a dedicated layout state for a non-formatting context root (it would be a no-op).
ASSERT(root.establishesFormattingContext());
}
Display::Box& LayoutState::displayBoxForLayoutBox(const Box& layoutBox)
{
return *m_layoutToDisplayBox.ensure(&layoutBox, [] {
return makeUnique<Display::Box>();
}).iterator->value;
}
const Display::Box& LayoutState::displayBoxForLayoutBox(const Box& layoutBox) const
{
ASSERT(hasDisplayBox(layoutBox));
return *m_layoutToDisplayBox.get(&layoutBox);
}
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 Container& formattingRoot) const
{
ASSERT(formattingRoot.establishesFormattingContext());
RELEASE_ASSERT(m_formattingStates.contains(&formattingRoot));
return *m_formattingStates.get(&formattingRoot);
}
FormattingState& LayoutState::createFormattingStateForFormattingRootIfNeeded(const Container& formattingContextRoot)
{
ASSERT(formattingContextRoot.establishesFormattingContext());
if (formattingContextRoot.establishesInlineFormattingContext()) {
return *m_formattingStates.ensure(&formattingContextRoot, [&] {
// 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 (formattingContextRoot.establishesBlockFormattingContext())
return makeUnique<InlineFormattingState>(FloatingState::create(*this, formattingContextRoot), *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.
auto& parentFormattingState = createFormattingStateForFormattingRootIfNeeded(formattingContextRoot.formattingContextRoot());
auto& parentFloatingState = parentFormattingState.floatingState();
return makeUnique<InlineFormattingState>(parentFloatingState, *this);
}).iterator->value;
}
if (formattingContextRoot.establishesBlockFormattingContext()) {
return *m_formattingStates.ensure(&formattingContextRoot, [&] {
// Block formatting context always establishes a new floating state.
return makeUnique<BlockFormattingState>(FloatingState::create(*this, formattingContextRoot), *this);
}).iterator->value;
}
if (formattingContextRoot.establishesTableFormattingContext()) {
return *m_formattingStates.ensure(&formattingContextRoot, [&] {
// Table formatting context always establishes a new floating state -and it stays empty.
return makeUnique<TableFormattingState>(FloatingState::create(*this, formattingContextRoot), *this);
}).iterator->value;
}
CRASH();
}
}
}
#endif