| /* |
| * Copyright (C) 2020 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 "FlexFormattingContext.h" |
| |
| #if ENABLE(LAYOUT_FORMATTING_CONTEXT) |
| |
| #include "FlexFormattingGeometry.h" |
| #include "FlexFormattingState.h" |
| #include "InlineRect.h" |
| #include "LayoutBoxGeometry.h" |
| #include "LayoutChildIterator.h" |
| #include "LayoutContext.h" |
| #include <wtf/IsoMallocInlines.h> |
| |
| namespace WebCore { |
| namespace Layout { |
| |
| WTF_MAKE_ISO_ALLOCATED_IMPL(FlexFormattingContext); |
| |
| FlexFormattingContext::FlexFormattingContext(const ContainerBox& formattingContextRoot, FlexFormattingState& formattingState) |
| : FormattingContext(formattingContextRoot, formattingState) |
| , m_flexFormattingGeometry(*this) |
| , m_flexFormattingQuirks(*this) |
| { |
| } |
| |
| void FlexFormattingContext::layoutInFlowContent(const ConstraintsForInFlowContent& constraints) |
| { |
| computeIntrinsicWidthConstraintsForFlexItems(); |
| sizeAndPlaceFlexItems(constraints); |
| } |
| |
| LayoutUnit FlexFormattingContext::usedContentHeight() const |
| { |
| auto& lines = formattingState().lines(); |
| return LayoutUnit { lines.last().bottom() - lines.first().top() }; |
| } |
| |
| IntrinsicWidthConstraints FlexFormattingContext::computedIntrinsicWidthConstraints() |
| { |
| return { }; |
| } |
| |
| void FlexFormattingContext::sizeAndPlaceFlexItems(const ConstraintsForInFlowContent& constraints) |
| { |
| auto& formattingState = this->formattingState(); |
| auto& formattingGeometry = this->formattingGeometry(); |
| auto flexItemMainAxisStart = constraints.horizontal().logicalLeft; |
| auto flexItemMainAxisEnd = flexItemMainAxisStart; |
| auto flexItemCrosAxisStart = constraints.logicalTop(); |
| auto flexItemCrosAxisEnd = flexItemCrosAxisStart; |
| for (auto& flexItem : childrenOfType<ContainerBox>(root())) { |
| ASSERT(flexItem.establishesFormattingContext()); |
| // FIXME: This is just a simple, let's layout the flex items and place them next to each other setup. |
| auto intrinsicWidths = formattingState.intrinsicWidthConstraintsForBox(flexItem); |
| auto flexItemLogicalWidth = std::min(std::max(intrinsicWidths->minimum, constraints.horizontal().logicalWidth), intrinsicWidths->maximum); |
| auto flexItemConstraints = ConstraintsForInFlowContent { { { }, flexItemLogicalWidth }, { } }; |
| |
| LayoutContext::createFormattingContext(flexItem, layoutState())->layoutInFlowContent(flexItemConstraints); |
| |
| auto computeFlexItemGeometry = [&] { |
| auto& flexItemGeometry = formattingState.boxGeometry(flexItem); |
| |
| flexItemGeometry.setLogicalTopLeft(LayoutPoint { flexItemMainAxisEnd, flexItemCrosAxisStart }); |
| |
| flexItemGeometry.setBorder(formattingGeometry.computedBorder(flexItem)); |
| flexItemGeometry.setPadding(formattingGeometry.computedPadding(flexItem, constraints.horizontal().logicalWidth)); |
| |
| auto computedHorizontalMargin = formattingGeometry.computedHorizontalMargin(flexItem, constraints.horizontal()); |
| flexItemGeometry.setHorizontalMargin({ computedHorizontalMargin.start.value_or(0_lu), computedHorizontalMargin.end.value_or(0_lu) }); |
| |
| auto computedVerticalMargin = formattingGeometry.computedVerticalMargin(flexItem, constraints.horizontal()); |
| flexItemGeometry.setVerticalMargin({ computedVerticalMargin.before.value_or(0_lu), computedVerticalMargin.after.value_or(0_lu) }); |
| |
| flexItemGeometry.setContentBoxHeight(formattingGeometry.contentHeightForFormattingContextRoot(flexItem)); |
| flexItemGeometry.setContentBoxWidth(flexItemLogicalWidth); |
| flexItemMainAxisEnd= BoxGeometry::borderBoxRect(flexItemGeometry).right(); |
| flexItemCrosAxisEnd = std::max(flexItemCrosAxisEnd, BoxGeometry::borderBoxRect(flexItemGeometry).bottom()); |
| }; |
| computeFlexItemGeometry(); |
| } |
| auto flexLine = InlineRect { flexItemCrosAxisStart, flexItemMainAxisStart, flexItemMainAxisEnd - flexItemMainAxisStart, flexItemCrosAxisEnd - flexItemCrosAxisStart }; |
| formattingState.addLine(flexLine); |
| } |
| |
| void FlexFormattingContext::computeIntrinsicWidthConstraintsForFlexItems() |
| { |
| auto& formattingState = this->formattingState(); |
| auto& formattingGeometry = this->formattingGeometry(); |
| for (auto& flexItem : childrenOfType<ContainerBox>(root())) { |
| if (formattingState.intrinsicWidthConstraintsForBox(flexItem)) |
| continue; |
| formattingState.setIntrinsicWidthConstraintsForBox(flexItem, formattingGeometry.intrinsicWidthConstraints(flexItem)); |
| } |
| } |
| |
| } |
| } |
| |
| #endif |