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<pre> /****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
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**
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** review the following information:
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/
#include <QtGui>
#include "mainwindow.h"
#include "previewform.h"
MainWindow::MainWindow()
{
textEdit = new QTextEdit;
textEdit->setLineWrapMode(QTextEdit::NoWrap);
setCentralWidget(textEdit);
findCodecs();
previewForm = new PreviewForm(this);
previewForm->setCodecList(codecs);
createActions();
createMenus();
setWindowTitle(tr("Codecs"));
resize(500, 400);
}
void MainWindow::open()
{
QString fileName = QFileDialog::getOpenFileName(this);
if (!fileName.isEmpty()) {
QFile file(fileName);
if (!file.open(QFile::ReadOnly | QFile::Text)) {
QMessageBox::warning(this, tr("Codecs"),
tr("Cannot read file %1:\n%2")
.arg(fileName)
.arg(file.errorString()));
return;
}
QByteArray data = file.readAll();
previewForm->setEncodedData(data);
if (previewForm->exec())
textEdit->setPlainText(previewForm->decodedString());
}
}
void MainWindow::save()
{
QString fileName = QFileDialog::getSaveFileName(this);
if (!fileName.isEmpty()) {
QFile file(fileName);
if (!file.open(QFile::WriteOnly | QFile::Text)) {
QMessageBox::warning(this, tr("Codecs"),
tr("Cannot write file %1:\n%2")
.arg(fileName)
.arg(file.errorString()));
return;
}
QAction *action = qobject_cast<QAction *>(sender());
QByteArray codecName = action->data().toByteArray();
QTextStream out(&file);
out.setCodec(codecName);
out << textEdit->toPlainText();
}
}
void MainWindow::about()
{
QMessageBox::about(this, tr("About Codecs"),
tr("The <b>Codecs</b> example demonstrates how to read and write "
"files using various encodings."));
}
void MainWindow::aboutToShowSaveAsMenu()
{
QString currentText = textEdit->toPlainText();
foreach (QAction *action, saveAsActs) {
QByteArray codecName = action->data().toByteArray();
QTextCodec *codec = QTextCodec::codecForName(codecName);
action->setVisible(codec && codec->canEncode(currentText));
}
}
void MainWindow::findCodecs()
{
QMap<QString, QTextCodec *> codecMap;
QRegExp iso8859RegExp("ISO[- ]8859-([0-9]+).*");
foreach (int mib, QTextCodec::availableMibs()) {
QTextCodec *codec = QTextCodec::codecForMib(mib);
QString sortKey = codec->name().toUpper();
int rank;
if (sortKey.startsWith("UTF-8")) {
rank = 1;
} else if (sortKey.startsWith("UTF-16")) {
rank = 2;
} else if (iso8859RegExp.exactMatch(sortKey)) {
if (iso8859RegExp.cap(1).size() == 1)
rank = 3;
else
rank = 4;
} else {
rank = 5;
}
sortKey.prepend(QChar('0' + rank));
codecMap.insert(sortKey, codec);
}
codecs = codecMap.values();
}
void MainWindow::createActions()
{
openAct = new QAction(tr("&Open..."), this);
openAct->setShortcut(tr("Ctrl+O"));
connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
foreach (QTextCodec *codec, codecs) {
QString text = tr("%1...").arg(QString(codec->name()));
QAction *action = new QAction(text, this);
action->setData(codec->name());
connect(action, SIGNAL(triggered()), this, SLOT(save()));
saveAsActs.append(action);
}
exitAct = new QAction(tr("E&xit"), this);
exitAct->setShortcut(tr("Ctrl+Q"));
connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
aboutAct = new QAction(tr("&About"), this);
connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
aboutQtAct = new QAction(tr("About &Qt"), this);
connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
}
void MainWindow::createMenus()
{
saveAsMenu = new QMenu(tr("&Save As"), this);
foreach (QAction *action, saveAsActs)
saveAsMenu->addAction(action);
connect(saveAsMenu, SIGNAL(aboutToShow()),
this, SLOT(aboutToShowSaveAsMenu()));
fileMenu = new QMenu(tr("&File"), this);
fileMenu->addAction(openAct);
fileMenu->addMenu(saveAsMenu);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);
helpMenu = new QMenu(tr("&Help"), this);
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
menuBar()->addMenu(fileMenu);
menuBar()->addSeparator();
menuBar()->addMenu(helpMenu);
}</pre>
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