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/**
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* Copyright (C) 2006 Apple Computer, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "third_party/blink/renderer/core/layout/layout_br.h"
#include "third_party/blink/renderer/core/css/style_engine.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/editing/position_with_affinity.h"
#include "third_party/blink/renderer/core/layout/layout_object_inlines.h"
namespace blink {
static scoped_refptr<StringImpl> NewlineString() {
DEFINE_STATIC_LOCAL(const String, string, ("\n"));
return string.Impl();
}
LayoutBR::LayoutBR(Node* node) : LayoutText(node, NewlineString()) {}
LayoutBR::~LayoutBR() = default;
int LayoutBR::LineHeight(bool first_line) const {
const ComputedStyle& style = StyleRef(
first_line && GetDocument().GetStyleEngine().UsesFirstLineRules());
return style.ComputedLineHeight();
}
void LayoutBR::StyleDidChange(StyleDifference diff,
const ComputedStyle* old_style) {
LayoutText::StyleDidChange(diff, old_style);
}
int LayoutBR::CaretMinOffset() const {
return 0;
}
int LayoutBR::CaretMaxOffset() const {
return 1;
}
PositionWithAffinity LayoutBR::PositionForPoint(const LayoutPoint&) const {
return CreatePositionWithAffinity(0);
}
Position LayoutBR::PositionForCaretOffset(unsigned offset) const {
DCHECK_LE(offset, 1u);
DCHECK(GetNode());
return offset ? Position::AfterNode(*GetNode())
: Position::BeforeNode(*GetNode());
}
base::Optional<unsigned> LayoutBR::CaretOffsetForPosition(
const Position& position) const {
if (position.IsNull() || position.AnchorNode() != GetNode())
return base::nullopt;
DCHECK(position.IsBeforeAnchor() || position.IsAfterAnchor()) << position;
return position.IsBeforeAnchor() ? 0 : 1;
}
} // namespace blink
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