previewform.cpp Example File

 /****************************************************************************
 **
 ** 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.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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);
 }