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

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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);

         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);
     }