| /** |
| * 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 { |
| NOT_DESTROYED(); |
| const ComputedStyle& style = StyleRef( |
| first_line && GetDocument().GetStyleEngine().UsesFirstLineRules()); |
| return style.ComputedLineHeight(); |
| } |
| |
| void LayoutBR::StyleDidChange(StyleDifference diff, |
| const ComputedStyle* old_style) { |
| NOT_DESTROYED(); |
| LayoutText::StyleDidChange(diff, old_style); |
| } |
| |
| int LayoutBR::CaretMinOffset() const { |
| NOT_DESTROYED(); |
| return 0; |
| } |
| |
| int LayoutBR::CaretMaxOffset() const { |
| NOT_DESTROYED(); |
| return 1; |
| } |
| |
| PositionWithAffinity LayoutBR::PositionForPoint(const PhysicalOffset&) const { |
| NOT_DESTROYED(); |
| // NG codepath requires |kPrePaintClean|. |
| // |SelectionModifier| calls this only in legacy codepath. |
| DCHECK(!IsInLayoutNGInlineFormattingContext() || |
| GetDocument().Lifecycle().GetState() >= |
| DocumentLifecycle::kPrePaintClean); |
| return PositionBeforeThis(); |
| } |
| |
| Position LayoutBR::PositionForCaretOffset(unsigned offset) const { |
| NOT_DESTROYED(); |
| DCHECK_LE(offset, 1u); |
| DCHECK(GetNode()); |
| return offset ? Position::AfterNode(*GetNode()) |
| : Position::BeforeNode(*GetNode()); |
| } |
| |
| absl::optional<unsigned> LayoutBR::CaretOffsetForPosition( |
| const Position& position) const { |
| NOT_DESTROYED(); |
| if (position.IsNull() || position.AnchorNode() != GetNode()) |
| return absl::nullopt; |
| DCHECK(position.IsBeforeAnchor() || position.IsAfterAnchor()) << position; |
| return position.IsBeforeAnchor() ? 0 : 1; |
| } |
| |
| } // namespace blink |