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/*
* (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* 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
* 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.
*
*/
#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 LayoutTextFragment final : public LayoutText {
public:
LayoutTextFragment(Node*, StringImpl*, int startOffset, int length);
LayoutTextFragment(Node*, StringImpl*);
~LayoutTextFragment() override;
bool isTextFragment() const override { return true; }
bool canBeSelectionLeaf() const override {
return node() && hasEditableStyle(*node());
}
unsigned start() const { return m_start; }
unsigned fragmentLength() const { return m_fragmentLength; }
unsigned textStartOffset() const override { return start(); }
void setContentString(StringImpl*);
StringImpl* contentString() const { return m_contentString.get(); }
// The complete text is all of the text in the associated DOM text node.
PassRefPtr<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.
PassRefPtr<StringImpl> originalText() const override;
void setText(PassRefPtr<StringImpl>, bool force = false) override;
void setTextFragment(PassRefPtr<StringImpl>, unsigned start, unsigned length);
void transformText() override;
// FIXME: Rename to LayoutTextFragment
const char* name() const override { return "LayoutTextFragment"; }
void setFirstLetterPseudoElement(FirstLetterPseudoElement* element) {
m_firstLetterPseudoElement = element;
}
FirstLetterPseudoElement* firstLetterPseudoElement() const {
return m_firstLetterPseudoElement;
}
void setIsRemainingTextLayoutObject(bool isRemainingText) {
m_isRemainingTextLayoutObject = isRemainingText;
}
bool isRemainingTextLayoutObject() const {
return m_isRemainingTextLayoutObject;
}
protected:
void willBeDestroyed() override;
private:
LayoutBlock* blockForAccompanyingFirstLetter() const;
UChar previousCharacter() const override;
Text* associatedTextNode() const;
void updateHitTestResult(HitTestResult&, const LayoutPoint&) override;
unsigned m_start;
unsigned m_fragmentLength;
bool m_isRemainingTextLayoutObject;
RefPtr<StringImpl> m_contentString;
// Reference back to FirstLetterPseudoElement; cleared by
// FirstLetterPseudoElement::detachLayoutTree() if it goes away first.
UntracedMember<FirstLetterPseudoElement> m_firstLetterPseudoElement;
};
DEFINE_TYPE_CASTS(LayoutTextFragment,
LayoutObject,
object,
toLayoutText(object)->isTextFragment(),
toLayoutText(object).isTextFragment());
} // namespace blink
#endif // LayoutTextFragment_h
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