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# previewform.cpp Example File
tools/codecs/previewform.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #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);

        buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok
                                        | QDialogButtonBox::Cancel);

        connect(encodingComboBox, SIGNAL(activated(int)),
                this, SLOT(updateTextEdit()));
        connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
        connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));

        QGridLayout *mainLayout = new QGridLayout;
        mainLayout->addWidget(encodingLabel, 0, 0);
        mainLayout->addWidget(encodingComboBox, 0, 1);
        mainLayout->addWidget(textEdit, 1, 0, 1, 2);
        mainLayout->addWidget(buttonBox, 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);
    }