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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);
        }