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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 "FormattingQuirks.h"
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
#include "FormattingGeometry.h"
#include "LayoutBox.h"
#include "LayoutBoxGeometry.h"
#include "LayoutContainingBlockChainIterator.h"
#include "LayoutInitialContainingBlock.h"
#include "LayoutState.h"
namespace WebCore {
namespace Layout {
FormattingQuirks::FormattingQuirks(const FormattingContext& formattingContext)
: m_formattingContext(formattingContext)
{
}
LayoutUnit FormattingQuirks::heightValueOfNearestContainingBlockWithFixedHeight(const Box& layoutBox) const
{
ASSERT(layoutState().inQuirksMode());
// In quirks mode, we go and travers the containing block chain to find a block level box with fixed height value, even if it means leaving
// the current formatting context. FIXME: surely we need to do some tricks here when block direction support is added.
auto& formattingContext = this->formattingContext();
auto* containingBlock = &layoutBox.containingBlock();
LayoutUnit bodyAndDocumentVerticalMarginPaddingAndBorder;
while (containingBlock) {
auto containingBlockHeight = containingBlock->style().logicalHeight();
if (containingBlockHeight.isFixed())
return LayoutUnit(containingBlockHeight.value() - bodyAndDocumentVerticalMarginPaddingAndBorder);
// If the only fixed value box we find is the ICB, then ignore the body and the document (vertical) margin, padding and border. So much quirkiness.
// -and it's totally insane because now we freely travel across formatting context boundaries and computed margins are nonexistent.
if (containingBlock->isBodyBox() || containingBlock->isDocumentBox()) {
auto& formattingGeometry = formattingContext.formattingGeometry();
auto horizontalConstraints = formattingGeometry.constraintsForInFlowContent(containingBlock->containingBlock(), FormattingContext::EscapeReason::FindFixedHeightAncestorQuirk).horizontal();
auto verticalMargin = formattingGeometry.computedVerticalMargin(*containingBlock, horizontalConstraints);
auto& boxGeometry = formattingContext.geometryForBox(*containingBlock, FormattingContext::EscapeReason::FindFixedHeightAncestorQuirk);
auto verticalPadding = boxGeometry.paddingBefore().value_or(0) + boxGeometry.paddingAfter().value_or(0);
auto verticalBorder = boxGeometry.borderBefore() + boxGeometry.borderAfter();
bodyAndDocumentVerticalMarginPaddingAndBorder += verticalMargin.before.value_or(0) + verticalMargin.after.value_or(0) + verticalPadding + verticalBorder;
}
if (is<InitialContainingBlock>(*containingBlock))
break;
containingBlock = &containingBlock->containingBlock();
}
// Initial containing block has to have a height.
return formattingContext.geometryForBox(layoutBox.initialContainingBlock(), FormattingContext::EscapeReason::FindFixedHeightAncestorQuirk).contentBox().height() - bodyAndDocumentVerticalMarginPaddingAndBorder;
}
}
}
#endif
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