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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 "BlockFormattingQuirks.h"
#include "BlockFormattingContext.h"
#include "BlockFormattingGeometry.h"
#include "BlockMarginCollapse.h"
#include "LayoutBox.h"
#include "LayoutBoxGeometry.h"
#include "LayoutElementBox.h"
#include "LayoutInitialContainingBlock.h"
#include "LayoutState.h"
#include "RenderStyleInlines.h"
namespace WebCore {
namespace Layout {
static bool isQuirkContainer(const ElementBox& layoutBox)
{
return layoutBox.isBodyBox() || layoutBox.isDocumentBox() || layoutBox.isTableCell();
}
BlockFormattingQuirks::BlockFormattingQuirks(const BlockFormattingContext& blockFormattingContext)
: FormattingQuirks(blockFormattingContext)
{
}
static bool needsStretching(const ElementBox& layoutBox)
{
ASSERT(layoutBox.isInFlow());
// In quirks mode, in-flow body and html stretch to the initial containing block (height: auto only).
if (!layoutBox.isDocumentBox() && !layoutBox.isBodyBox())
return false;
return layoutBox.style().logicalHeight().isAuto();
}
std::optional<LayoutUnit> BlockFormattingQuirks::stretchedInFlowHeightIfApplicable(const ElementBox& layoutBox, ContentHeightAndMargin contentHeightAndMargin) const
{
ASSERT(layoutState().inQuirksMode());
if (!needsStretching(layoutBox))
return { };
auto& formattingContext = downcast<BlockFormattingContext>(this->formattingContext());
auto nonCollapsedVerticalMargin = contentHeightAndMargin.nonCollapsedMargin.before + contentHeightAndMargin.nonCollapsedMargin.after;
if (layoutBox.isDocumentBox()) {
// Let's stretch the inflow document box(<html>) to the height of the initial containing block (view).
auto documentBoxContentHeight = formattingContext.geometryForBox(FormattingContext::initialContainingBlock(layoutBox), FormattingContext::EscapeReason::DocumentBoxStretchesToViewportQuirk).contentBoxHeight();
// Document box's own vertical margin/border/padding values always shrink the content height.
auto& documentBoxGeometry = formattingContext.geometryForBox(layoutBox);
documentBoxContentHeight -= nonCollapsedVerticalMargin + documentBoxGeometry.verticalBorder() + documentBoxGeometry.verticalPadding().value_or(0);
return std::max(contentHeightAndMargin.contentHeight, documentBoxContentHeight);
}
// Here is the quirky part for body box when it stretches all the way to the ICB even when the document box does not (e.g. out-of-flow positioned).
ASSERT(layoutBox.isBodyBox());
auto& initialContainingBlock = FormattingContext::initialContainingBlock(layoutBox);
auto& initialContainingBlockGeometry = formattingContext.geometryForBox(initialContainingBlock, FormattingContext::EscapeReason::BodyStretchesToViewportQuirk);
// Start the content height with the ICB.
auto bodyBoxContentHeight = initialContainingBlockGeometry.contentBoxHeight();
// Body box's own border and padding shrink the content height.
auto& bodyBoxGeometry = formattingContext.geometryForBox(layoutBox);
bodyBoxContentHeight -= bodyBoxGeometry.verticalBorder() + bodyBoxGeometry.verticalPadding().value_or(0);
// Body box never collapses its vertical margins with the document box but it might collapse its margin with its descendants.
auto nonCollapsedMargin = contentHeightAndMargin.nonCollapsedMargin;
auto marginCollapse = BlockMarginCollapse { formattingContext.layoutState(), formattingContext.formattingState() };
auto collapsedMargin = marginCollapse.collapsedVerticalValues(layoutBox, nonCollapsedMargin).collapsedValues;
auto usedVerticalMargin = collapsedMargin.before.value_or(nonCollapsedMargin.before);
usedVerticalMargin += collapsedMargin.isCollapsedThrough ? nonCollapsedMargin.after : collapsedMargin.after.value_or(nonCollapsedMargin.after);
bodyBoxContentHeight -= usedVerticalMargin;
// Document box's padding and border also shrink the body box's content height.
auto& documentBox = layoutBox.parent();
auto& documentBoxGeometry = formattingContext.geometryForBox(documentBox, FormattingContext::EscapeReason::BodyStretchesToViewportQuirk);
bodyBoxContentHeight -= documentBoxGeometry.verticalBorder() + documentBoxGeometry.verticalPadding().value_or(0);
// However the non-in-flow document box's vertical margins are ignored. They don't affect the body box's content height.
if (documentBox.isInFlow()) {
auto& formattingGeometry = formattingContext.formattingGeometry();
auto precomputeDocumentBoxVerticalMargin = formattingGeometry.computedVerticalMargin(documentBox, formattingGeometry.constraintsForInFlowContent(initialContainingBlock, FormattingContext::EscapeReason::BodyStretchesToViewportQuirk).horizontal());
bodyBoxContentHeight -= precomputeDocumentBoxVerticalMargin.before.value_or(0) + precomputeDocumentBoxVerticalMargin.after.value_or(0);
}
return std::max(contentHeightAndMargin.contentHeight, bodyBoxContentHeight);
}
bool BlockFormattingQuirks::shouldIgnoreCollapsedQuirkMargin(const ElementBox& layoutBox)
{
return isQuirkContainer(layoutBox);
}
enum class VerticalMargin { Before, After };
static inline bool hasQuirkMarginToCollapse(const ElementBox& layoutBox, VerticalMargin verticalMargin)
{
if (!layoutBox.isInFlow())
return false;
auto& style = layoutBox.style();
return (verticalMargin == VerticalMargin::Before && style.marginBefore().hasQuirk()) || (verticalMargin == VerticalMargin::After && style.marginAfter().hasQuirk());
}
bool BlockFormattingQuirks::shouldCollapseMarginBeforeWithParentMarginBefore(const ElementBox& layoutBox)
{
return hasQuirkMarginToCollapse(layoutBox, VerticalMargin::Before) && isQuirkContainer(FormattingContext::containingBlock(layoutBox));
}
bool BlockFormattingQuirks::shouldCollapseMarginAfterWithParentMarginAfter(const ElementBox& layoutBox)
{
return hasQuirkMarginToCollapse(layoutBox, VerticalMargin::After) && isQuirkContainer(FormattingContext::containingBlock(layoutBox));
}
}
}
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