previewform.cpp Example File

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 #include <QtWidgets>

 #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);
 }