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* (C) 1999 Lars Knoll (
* (C) 2000 Dirk Mueller (
* Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
* 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
* 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.
#ifndef LayoutTextFragment_h
#define LayoutTextFragment_h
#include "core/editing/EditingUtilities.h"
#include "core/layout/LayoutText.h"
#include "platform/heap/Handle.h"
namespace blink {
class FirstLetterPseudoElement;
// Used to represent a text substring of an element, e.g., for text runs that
// are split because of first letter and that must therefore have different
// styles (and positions in the layout tree).
// We cache offsets so that text transformations can be applied in such a way
// that we can recover the original unaltered string from our corresponding DOM
// node.
class CORE_EXPORT LayoutTextFragment final : public LayoutText {
LayoutTextFragment(Node*, StringImpl*, int start_offset, int length);
LayoutTextFragment(Node*, StringImpl*);
~LayoutTextFragment() override;
static LayoutTextFragment* CreateAnonymous(PseudoElement&, StringImpl*);
static LayoutTextFragment* CreateAnonymous(PseudoElement&,
unsigned start,
unsigned length);
bool IsTextFragment() const override { return true; }
Position PositionForCaretOffset(unsigned) const override;
Optional<unsigned> CaretOffsetForPosition(const Position&) const override;
unsigned Start() const { return start_; }
unsigned FragmentLength() const { return fragment_length_; }
unsigned TextStartOffset() const override { return Start(); }
void SetContentString(StringImpl*);
StringImpl* ContentString() const { return content_string_.get(); }
// The complete text is all of the text in the associated DOM text node.
scoped_refptr<StringImpl> CompleteText() const;
// The fragment text is the text which will be used by this
// LayoutTextFragment. For things like first-letter this may differ from the
// completeText as we maybe using only a portion of the text nodes content.
scoped_refptr<StringImpl> OriginalText() const override;
void SetText(scoped_refptr<StringImpl>, bool force = false) override;
void SetTextFragment(scoped_refptr<StringImpl>,
unsigned start,
unsigned length);
void TransformText() override;
const char* GetName() const override { return "LayoutTextFragment"; }
void SetFirstLetterPseudoElement(FirstLetterPseudoElement* element) {
first_letter_pseudo_element_ = element;
FirstLetterPseudoElement* GetFirstLetterPseudoElement() const {
return first_letter_pseudo_element_;
void SetIsRemainingTextLayoutObject(bool is_remaining_text) {
is_remaining_text_layout_object_ = is_remaining_text;
bool IsRemainingTextLayoutObject() const {
return is_remaining_text_layout_object_;
Text* AssociatedTextNode() const;
void WillBeDestroyed() override;
LayoutBlock* BlockForAccompanyingFirstLetter() const;
UChar PreviousCharacter() const override;
void UpdateHitTestResult(HitTestResult&, const LayoutPoint&) override;
unsigned start_;
unsigned fragment_length_;
bool is_remaining_text_layout_object_;
scoped_refptr<StringImpl> content_string_;
// Reference back to FirstLetterPseudoElement; cleared by
// FirstLetterPseudoElement::detachLayoutTree() if it goes away first.
UntracedMember<FirstLetterPseudoElement> first_letter_pseudo_element_;
} // namespace blink
#endif // LayoutTextFragment_h