Qt 4.8: previewform.cpp Example File (tools/codecs/previewform.cpp)

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# previewform.cpp Example File

tools/codecs/previewform.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
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     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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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);
     }