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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.
*
*/
#include "core/layout/LayoutTextFragment.h"
#include "core/dom/FirstLetterPseudoElement.h"
#include "core/dom/PseudoElement.h"
#include "core/dom/StyleChangeReason.h"
#include "core/dom/Text.h"
#include "core/layout/HitTestResult.h"
namespace blink {
LayoutTextFragment::LayoutTextFragment(Node* node,
StringImpl* str,
int startOffset,
int length)
: LayoutText(node,
str ? str->substring(startOffset, length)
: PassRefPtr<StringImpl>(nullptr)),
m_start(startOffset),
m_fragmentLength(length),
m_isRemainingTextLayoutObject(false),
m_contentString(str),
m_firstLetterPseudoElement(nullptr) {}
LayoutTextFragment::LayoutTextFragment(Node* node, StringImpl* str)
: LayoutText(node, str),
m_start(0),
m_fragmentLength(str ? str->length() : 0),
m_isRemainingTextLayoutObject(false),
m_contentString(str),
m_firstLetterPseudoElement(nullptr) {}
LayoutTextFragment::~LayoutTextFragment() {
ASSERT(!m_firstLetterPseudoElement);
}
void LayoutTextFragment::willBeDestroyed() {
if (m_isRemainingTextLayoutObject && m_firstLetterPseudoElement)
m_firstLetterPseudoElement->setRemainingTextLayoutObject(nullptr);
m_firstLetterPseudoElement = nullptr;
LayoutText::willBeDestroyed();
}
PassRefPtr<StringImpl> LayoutTextFragment::completeText() const {
Text* text = associatedTextNode();
return text ? text->dataImpl() : contentString();
}
void LayoutTextFragment::setContentString(StringImpl* str) {
m_contentString = str;
setText(str);
}
PassRefPtr<StringImpl> LayoutTextFragment::originalText() const {
RefPtr<StringImpl> result = completeText();
if (!result)
return nullptr;
return result->substring(start(), fragmentLength());
}
void LayoutTextFragment::setText(PassRefPtr<StringImpl> text, bool force) {
LayoutText::setText(std::move(text), force);
m_start = 0;
m_fragmentLength = textLength();
// If we're the remaining text from a first letter then we have to tell the
// first letter pseudo element to reattach itself so it can re-calculate the
// correct first-letter settings.
if (isRemainingTextLayoutObject()) {
ASSERT(firstLetterPseudoElement());
firstLetterPseudoElement()->updateTextFragments();
}
}
void LayoutTextFragment::setTextFragment(PassRefPtr<StringImpl> text,
unsigned start,
unsigned length) {
LayoutText::setText(std::move(text), false);
m_start = start;
m_fragmentLength = length;
}
void LayoutTextFragment::transformText() {
// Note, we have to call LayoutText::setText here because, if we use our
// version we will, potentially, screw up the first-letter settings where
// we only use portions of the string.
if (RefPtr<StringImpl> textToTransform = originalText())
LayoutText::setText(std::move(textToTransform), true);
}
UChar LayoutTextFragment::previousCharacter() const {
if (start()) {
StringImpl* original = completeText().get();
if (original && start() <= original->length())
return (*original)[start() - 1];
}
return LayoutText::previousCharacter();
}
// If this is the layoutObject for a first-letter pseudoNode then we have to
// look at the node for the remaining text to find our content.
Text* LayoutTextFragment::associatedTextNode() const {
Node* node = this->firstLetterPseudoElement();
if (m_isRemainingTextLayoutObject || !node) {
// If we don't have a node, then we aren't part of a first-letter pseudo
// element, so use the actual node. Likewise, if we have a node, but
// we're the remainingTextLayoutObject for a pseudo element use the real
// text node.
node = this->node();
}
if (!node)
return nullptr;
if (node->isFirstLetterPseudoElement()) {
FirstLetterPseudoElement* pseudo = toFirstLetterPseudoElement(node);
LayoutObject* nextLayoutObject =
FirstLetterPseudoElement::firstLetterTextLayoutObject(*pseudo);
if (!nextLayoutObject)
return nullptr;
node = nextLayoutObject->node();
}
return (node && node->isTextNode()) ? toText(node) : nullptr;
}
void LayoutTextFragment::updateHitTestResult(HitTestResult& result,
const LayoutPoint& point) {
if (result.innerNode())
return;
LayoutObject::updateHitTestResult(result, point);
// If we aren't part of a first-letter element, or if we
// are part of first-letter but we're the remaining text then return.
if (m_isRemainingTextLayoutObject || !firstLetterPseudoElement())
return;
result.setInnerNode(firstLetterPseudoElement());
}
} // namespace blink
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