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    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 

    44 #include "mainwindow.h"

    45 #include "previewform.h"

    46 

    47 MainWindow::MainWindow()

    48 {

    49     textEdit = new QTextEdit;

    50     textEdit->setLineWrapMode(QTextEdit::NoWrap);

    51     setCentralWidget(textEdit);

    52 

    53     findCodecs();

    54 

    55     previewForm = new PreviewForm(this);

    56     previewForm->setCodecList(codecs);

    57 

    58     createActions();

    59     createMenus();

    60 

    61     setWindowTitle(tr("Codecs"));

    62     resize(500, 400);

    63 }

    64 

    65 void MainWindow::open()

    66 {

    67     QString fileName = QFileDialog::getOpenFileName(this);

    68     if (!fileName.isEmpty()) {

    69         QFile file(fileName);

    70         if (!file.open(QFile::ReadOnly)) {

    71             QMessageBox::warning(this, tr("Codecs"),

    72                                  tr("Cannot read file %1:\n%2")

    73                                  .arg(fileName)

    74                                  .arg(file.errorString()));

    75             return;

    76         }

    77 

    78         QByteArray data = file.readAll();

    79 

    80         previewForm->setEncodedData(data);

    81         if (previewForm->exec())

    82             textEdit->setPlainText(previewForm->decodedString());

    83     }

    84 }

    85 

    86 void MainWindow::save()

    87 {

    88     QString fileName = QFileDialog::getSaveFileName(this);

    89     if (!fileName.isEmpty()) {

    90         QFile file(fileName);

    91         if (!file.open(QFile::WriteOnly | QFile::Text)) {

    92             QMessageBox::warning(this, tr("Codecs"),

    93                                  tr("Cannot write file %1:\n%2")

    94                                  .arg(fileName)

    95                                  .arg(file.errorString()));

    96             return;

    97         }

    98 

    99         QAction *action = qobject_cast<QAction *>(sender());

   100         QByteArray codecName = action->data().toByteArray();

   101 

   102         QTextStream out(&file);

   103         out.setCodec(codecName);

   104         out << textEdit->toPlainText();

   105     }

   106 }

   107 

   108 void MainWindow::about()

   109 {

   110     QMessageBox::about(this, tr("About Codecs"),

   111             tr("The <b>Codecs</b> example demonstrates how to read and write "

   112                "files using various encodings."));

   113 }

   114 

   115 void MainWindow::aboutToShowSaveAsMenu()

   116 {

   117     QString currentText = textEdit->toPlainText();

   118 

   119     foreach (QAction *action, saveAsActs) {

   120         QByteArray codecName = action->data().toByteArray();

   121         QTextCodec *codec = QTextCodec::codecForName(codecName);

   122         action->setVisible(codec && codec->canEncode(currentText));

   123     }

   124 }

   125 

   126 void MainWindow::findCodecs()

   127 {

   128     QMap<QString, QTextCodec *> codecMap;

   129     QRegExp iso8859RegExp("ISO[- ]8859-([0-9]+).*");

   130 

   131     foreach (int mib, QTextCodec::availableMibs()) {

   132         QTextCodec *codec = QTextCodec::codecForMib(mib);

   133 

   134         QString sortKey = codec->name().toUpper();

   135         int rank;

   136 

   137         if (sortKey.startsWith("UTF-8")) {

   138             rank = 1;

   139         } else if (sortKey.startsWith("UTF-16")) {

   140             rank = 2;

   141         } else if (iso8859RegExp.exactMatch(sortKey)) {

   142             if (iso8859RegExp.cap(1).size() == 1)

   143                 rank = 3;

   144             else

   145                 rank = 4;

   146         } else {

   147             rank = 5;

   148         }

   149         sortKey.prepend(QChar('0' + rank));

   150 

   151         codecMap.insert(sortKey, codec);

   152     }

   153     codecs = codecMap.values();

   154 }

   155 

   156 void MainWindow::createActions()

   157 {

   158     openAct = new QAction(tr("&Open..."), this);

   159     openAct->setShortcuts(QKeySequence::Open);

   160     connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

   161 

   162     foreach (QTextCodec *codec, codecs) {

   163         QString text = tr("%1...").arg(QString(codec->name()));

   164 

   165         QAction *action = new QAction(text, this);

   166 	action->setData(codec->name());

   167         connect(action, SIGNAL(triggered()), this, SLOT(save()));

   168         saveAsActs.append(action);

   169     }

   170 

   171     exitAct = new QAction(tr("E&xit"), this);

   172     exitAct->setShortcuts(QKeySequence::Quit);

   173     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

   174 

   175     aboutAct = new QAction(tr("&About"), this);

   176     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

   177 

   178     aboutQtAct = new QAction(tr("About &Qt"), this);

   179     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

   180 }

   181 

   182 void MainWindow::createMenus()

   183 {

   184     saveAsMenu = new QMenu(tr("&Save As"), this);

   185     foreach (QAction *action, saveAsActs)

   186         saveAsMenu->addAction(action);

   187     connect(saveAsMenu, SIGNAL(aboutToShow()),

   188             this, SLOT(aboutToShowSaveAsMenu()));

   189 

   190     fileMenu = new QMenu(tr("&File"), this);

   191     fileMenu->addAction(openAct);

   192     fileMenu->addMenu(saveAsMenu);

   193     fileMenu->addSeparator();

   194     fileMenu->addAction(exitAct);

   195 

   196     helpMenu = new QMenu(tr("&Help"), this);

   197     helpMenu->addAction(aboutAct);

   198     helpMenu->addAction(aboutQtAct);

   199 

   200     menuBar()->addMenu(fileMenu);

   201     menuBar()->addSeparator();

   202     menuBar()->addMenu(helpMenu);

   203 }