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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "private/textwriter_p.h"
QT_QML_BEGIN_NAMESPACE
using namespace QDeclarativeJS;
TextWriter::TextWriter()
:string(0), cursor(0)
{
}
static bool overlaps(int posA, int lengthA, int posB, int lengthB) {
return (posA < posB + lengthB && posA + lengthA > posB + lengthB)
|| (posA < posB && posA + lengthA > posB);
}
bool TextWriter::hasOverlap(int pos, int length)
{
{
QListIterator<Replace> i(replaceList);
while (i.hasNext()) {
const Replace &cmd = i.next();
if (overlaps(pos, length, cmd.pos, cmd.length))
return true;
}
}
{
QListIterator<Move> i(moveList);
while (i.hasNext()) {
const Move &cmd = i.next();
if (overlaps(pos, length, cmd.pos, cmd.length))
return true;
}
return false;
}
}
bool TextWriter::hasMoveInto(int pos, int length)
{
QListIterator<Move> i(moveList);
while (i.hasNext()) {
const Move &cmd = i.next();
if (cmd.to >= pos && cmd.to < pos + length)
return true;
}
return false;
}
void TextWriter::replace(int pos, int length, const QString &replacement)
{
Q_ASSERT(!hasOverlap(pos, length));
Q_ASSERT(!hasMoveInto(pos, length));
Replace cmd;
cmd.pos = pos;
cmd.length = length;
cmd.replacement = replacement;
replaceList += cmd;
}
void TextWriter::move(int pos, int length, int to)
{
Q_ASSERT(!hasOverlap(pos, length));
Move cmd;
cmd.pos = pos;
cmd.length = length;
cmd.to = to;
moveList += cmd;
}
void TextWriter::doReplace(const Replace &replace)
{
int diff = replace.replacement.size() - replace.length;
{
QMutableListIterator<Replace> i(replaceList);
while (i.hasNext()) {
Replace &c = i.next();
if (replace.pos < c.pos)
c.pos += diff;
else if (replace.pos + replace.length < c.pos + c.length)
c.length += diff;
}
}
{
QMutableListIterator<Move> i(moveList);
while (i.hasNext()) {
Move &c = i.next();
if (replace.pos < c.pos)
c.pos += diff;
else if (replace.pos + replace.length < c.pos + c.length)
c.length += diff;
if (replace.pos < c.to)
c.to += diff;
}
}
if (string) {
string->replace(replace.pos, replace.length, replace.replacement);
} else if (cursor) {
cursor->setPosition(replace.pos);
cursor->setPosition(replace.pos + replace.length, QTextCursor::KeepAnchor);
cursor->insertText(replace.replacement);
}
}
void TextWriter::doMove(const Move &move)
{
QString text;
if (string) {
text = string->mid(move.pos, move.length);
} else if (cursor) {
cursor->setPosition(move.pos);
cursor->setPosition(move.pos + move.length, QTextCursor::KeepAnchor);
text = cursor->selectedText();
}
Replace cut;
cut.pos = move.pos;
cut.length = move.length;
Replace paste;
paste.pos = move.to;
paste.length = 0;
paste.replacement = text;
replaceList.append(cut);
replaceList.append(paste);
Replace cmd;
while (!replaceList.isEmpty()) {
cmd = replaceList.first();
replaceList.removeFirst();
doReplace(cmd);
}
}
void TextWriter::write(QString *s)
{
string = s;
write_helper();
string = 0;
}
void TextWriter::write(QTextCursor *textCursor)
{
cursor = textCursor;
write_helper();
cursor = 0;
}
void TextWriter::write_helper()
{
if (cursor)
cursor->beginEditBlock();
{
Replace cmd;
while (!replaceList.isEmpty()) {
cmd = replaceList.first();
replaceList.removeFirst();
doReplace(cmd);
}
}
{
Move cmd;
while (!moveList.isEmpty()) {
cmd = moveList.first();
moveList.removeFirst();
doMove(cmd);
}
}
if (cursor)
cursor->endEditBlock();
}
QT_QML_END_NAMESPACE
|
