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

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        ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
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        ** This file is part of the documentation of the Qt Toolkit.
        **
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    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
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    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
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    ** packaging of this file.
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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);
        }