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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 "LayoutContext.h"
#include "BlockFormattingContext.h"
#include "BlockFormattingState.h"
#include "FlexFormattingContext.h"
#include "FlexFormattingState.h"
#include "InlineFormattingContext.h"
#include "InlineFormattingState.h"
#include "LayoutBox.h"
#include "LayoutBoxGeometry.h"
#include "LayoutElementBox.h"
#include "LayoutPhase.h"
#include "LayoutTreeBuilder.h"
#include "RenderStyleConstants.h"
#include "RenderStyleSetters.h"
#include "RenderView.h"
#include "TableFormattingContext.h"
#include "TableFormattingState.h"
#include "TableWrapperBlockFormattingContext.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_ISO_ALLOCATED_IMPL(LayoutContext);
LayoutContext::LayoutContext(LayoutState& layoutState)
: m_layoutState(layoutState)
{
}
void LayoutContext::layout(const LayoutSize& rootContentBoxSize)
{
// Set the geometry on the root.
// Note that we never layout the root box. It has to have an already computed geometry (in case of ICB, it's the view geometry).
// ICB establishes the initial BFC, but it does not live in a formatting context and while a non-ICB root(subtree layout) has to have a formatting context,
// we could not lay it out even if we wanted to since it's outside of this LayoutContext.
auto& boxGeometry = layoutState().geometryForRootBox();
boxGeometry.setHorizontalMargin({ });
boxGeometry.setVerticalMargin({ });
boxGeometry.setBorder({ });
boxGeometry.setPadding({ });
boxGeometry.setLogicalTopLeft({ });
boxGeometry.setContentBoxHeight(rootContentBoxSize.height());
boxGeometry.setContentBoxWidth(rootContentBoxSize.width());
auto scope = PhaseScope { Phase::Type::Layout };
layoutFormattingContextSubtree(m_layoutState.root());
}
void LayoutContext::layoutFormattingContextSubtree(const ElementBox& formattingContextRoot)
{
RELEASE_ASSERT(formattingContextRoot.establishesFormattingContext());
if (!formattingContextRoot.hasChild())
return;
auto formattingContext = createFormattingContext(formattingContextRoot, layoutState());
auto& boxGeometry = layoutState().geometryForBox(formattingContextRoot);
if (formattingContextRoot.hasInFlowOrFloatingChild()) {
auto constraintsForInFlowContent = ConstraintsForInFlowContent { { boxGeometry.contentBoxLeft(), boxGeometry.contentBoxWidth() }, boxGeometry.contentBoxTop() };
formattingContext->layoutInFlowContent(constraintsForInFlowContent);
}
// FIXME: layoutFormattingContextSubtree() does not perform layout on the root, rather it lays out the root's content.
// It constructs an FC for descendant boxes and runs layout on them. The formattingContextRoot is laid out in the FC in which it lives (parent formatting context).
// It also means that the formattingContextRoot has to have a valid/clean geometry at this point.
{
auto constraints = ConstraintsForOutOfFlowContent { { boxGeometry.paddingBoxLeft(), boxGeometry.paddingBoxWidth() },
{ boxGeometry.paddingBoxTop(), boxGeometry.paddingBoxHeight() }, boxGeometry.contentBoxWidth() };
formattingContext->layoutOutOfFlowContent(constraints);
}
}
std::unique_ptr<FormattingContext> LayoutContext::createFormattingContext(const ElementBox& formattingContextRoot, LayoutState& layoutState)
{
ASSERT(formattingContextRoot.establishesFormattingContext());
if (formattingContextRoot.establishesInlineFormattingContext()) {
auto& inlineFormattingState = layoutState.ensureInlineFormattingState(formattingContextRoot);
return makeUnique<InlineFormattingContext>(formattingContextRoot, inlineFormattingState);
}
if (formattingContextRoot.establishesBlockFormattingContext()) {
ASSERT(!formattingContextRoot.establishesInlineFormattingContext());
auto& blockFormattingState = layoutState.ensureBlockFormattingState(formattingContextRoot);
if (formattingContextRoot.isTableWrapperBox())
return makeUnique<TableWrapperBlockFormattingContext>(formattingContextRoot, blockFormattingState);
return makeUnique<BlockFormattingContext>(formattingContextRoot, blockFormattingState);
}
if (formattingContextRoot.establishesFlexFormattingContext()) {
auto& flexFormattingState = layoutState.ensureFlexFormattingState(formattingContextRoot);
return makeUnique<FlexFormattingContext>(formattingContextRoot, flexFormattingState);
}
if (formattingContextRoot.establishesTableFormattingContext()) {
auto& tableFormattingState = layoutState.ensureTableFormattingState(formattingContextRoot);
return makeUnique<TableFormattingContext>(formattingContextRoot, tableFormattingState);
}
CRASH();
}
}
}
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