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previewform.cpp Example File
^{tools/codecs/previewform.cpp}

    /****************************************************************************
    **
    ** Copyright (C) 2004-2006 Trolltech AS. All rights reserved.
    **
    ** This file is part of the documentation 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:
    ** http://www.trolltech.com/products/qt/opensource.html
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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 "previewform.h"

    PreviewForm::PreviewForm(QWidget *parent)
        : QDialog(parent)
    {
        encodingComboBox = new QComboBox;

        encodingLabel = new QLabel(tr("&Encoding:"));
        encodingLabel->setBuddy(encodingComboBox);

        textEdit = new QTextEdit;
        textEdit->setLineWrapMode(QTextEdit::NoWrap);
        textEdit->setReadOnly(true);

        okButton = new QPushButton(tr("OK"));
        cancelButton = new QPushButton(tr("Cancel"));
        okButton->setDefault(true);

        connect(encodingComboBox, SIGNAL(activated(int)),
                this, SLOT(updateTextEdit()));
        connect(okButton, SIGNAL(clicked()), this, SLOT(accept()));
        connect(cancelButton, SIGNAL(clicked()), this, SLOT(reject()));

        QHBoxLayout *buttonLayout = new QHBoxLayout;
        buttonLayout->addStretch(1);
        buttonLayout->addWidget(okButton);
        buttonLayout->addWidget(cancelButton);

        QGridLayout *mainLayout = new QGridLayout;
        mainLayout->addWidget(encodingLabel, 0, 0);
        mainLayout->addWidget(encodingComboBox, 0, 1);
        mainLayout->addWidget(textEdit, 1, 0, 1, 2);
        mainLayout->addLayout(buttonLayout, 2, 0, 1, 2);
        setLayout(mainLayout);

        setWindowTitle(tr("Choose Encoding"));
        resize(400, 300);
    }

    void PreviewForm::setCodecList(const QList<QTextCodec *> &list)
    {
        encodingComboBox->clear();
        foreach (QTextCodec *codec, list)
            encodingComboBox->addItem(codec->name(), codec->mibEnum());
    }

    void PreviewForm::setEncodedData(const QByteArray &data)
    {
        encodedData = data;
        updateTextEdit();
    }

    void PreviewForm::updateTextEdit()
    {
        int mib = encodingComboBox->itemData(
                          encodingComboBox->currentIndex()).toInt();
        QTextCodec *codec = QTextCodec::codecForMib(mib);

        QTextStream in(&encodedData);
        in.setAutoDetectUnicode(false);
        in.setCodec(codec);
        decodedStr = in.readAll();

        textEdit->setPlainText(decodedStr);
    }