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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/layout/ng/flex/layout_ng_flexible_box.h"
#include "third_party/blink/renderer/core/layout/layout_analyzer.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/layout/ng/ng_block_node.h"
#include "third_party/blink/renderer/core/layout/ng/ng_constraint_space.h"
#include "third_party/blink/renderer/core/layout/ng/ng_layout_result.h"
#include "third_party/blink/renderer/core/layout/ng/ng_out_of_flow_positioned_node.h"
#include "third_party/blink/renderer/core/layout/ng/ng_physical_box_fragment.h"
namespace blink {
LayoutNGFlexibleBox::LayoutNGFlexibleBox(Element* element)
: LayoutNGMixin<LayoutBlock>(element) {}
bool LayoutNGFlexibleBox::HasTopOverflow() const {
if (IsHorizontalWritingMode())
return StyleRef().ResolvedIsColumnReverseFlexDirection();
return StyleRef().IsLeftToRightDirection() ==
StyleRef().ResolvedIsRowReverseFlexDirection();
}
bool LayoutNGFlexibleBox::HasLeftOverflow() const {
if (IsHorizontalWritingMode()) {
return StyleRef().IsLeftToRightDirection() ==
StyleRef().ResolvedIsRowReverseFlexDirection();
}
return StyleRef().ResolvedIsColumnReverseFlexDirection();
}
void LayoutNGFlexibleBox::UpdateBlockLayout(bool relayout_children) {
LayoutAnalyzer::BlockScope analyzer(*this);
if (IsOutOfFlowPositioned()) {
UpdateOutOfFlowBlockLayout();
return;
}
UpdateInFlowBlockLayout();
}
namespace {
void MergeAnonymousFlexItems(LayoutObject* remove_child) {
// When we remove a flex item, and the previous and next siblings of the item
// are text nodes wrapped in anonymous flex items, the adjacent text nodes
// need to be merged into the same flex item.
LayoutObject* prev = remove_child->PreviousSibling();
if (!prev || !prev->IsAnonymousBlock())
return;
LayoutObject* next = remove_child->NextSibling();
if (!next || !next->IsAnonymousBlock())
return;
ToLayoutBoxModelObject(next)->MoveAllChildrenTo(ToLayoutBoxModelObject(prev));
To<LayoutBlockFlow>(next)->DeleteLineBoxTree();
next->Destroy();
}
} // namespace
void LayoutNGFlexibleBox::RemoveChild(LayoutObject* child) {
if (!DocumentBeingDestroyed() &&
!StyleRef().IsDeprecatedFlexboxUsingFlexLayout())
MergeAnonymousFlexItems(child);
LayoutBlock::RemoveChild(child);
}
} // namespace blink
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