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echowindow.cpp Example File
tools/echoplugin/echowindow/echowindow.cpp

 /****************************************************************************
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 ** Copyright (C) 2007-2008 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes of the Qt Toolkit.
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 ** contained therein.  Please consult your licensing agreement or
 ** contact sales@trolltech.com if any conditions of this licensing
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 ** contacting info@trolltech.com.
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 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 ****************************************************************************/

 #include <QtGui>

 #include "echowindow.h"

 EchoWindow::EchoWindow()
 {
     createGUI();
     setLayout(layout);
     setWindowTitle("Echo Plugin Example");

     if (!loadPlugin()) {
         QMessageBox::information(this, "Error", "Could not load the plugin");
         lineEdit->setEnabled(false);
         button->setEnabled(false);
     }
 }

 void EchoWindow::sendEcho()
 {
     QString text = echoInterface->echo(lineEdit->text());
     label->setText(text);
 }

 void EchoWindow::createGUI()
 {
     lineEdit = new QLineEdit;
     label = new QLabel;
     label->setFrameStyle(QFrame::Box | QFrame::Plain);
     button = new QPushButton(tr("Send Message"));

     connect(lineEdit, SIGNAL(editingFinished()),
             this, SLOT(sendEcho()));
     connect(button, SIGNAL(clicked()),
             this, SLOT(sendEcho()));

     layout = new QGridLayout;
     layout->addWidget(new QLabel(tr("Message:")), 0, 0);
     layout->addWidget(lineEdit, 0, 1);
     layout->addWidget(new QLabel(tr("Answer:")), 1, 0);
     layout->addWidget(label, 1, 1);
     layout->addWidget(button, 2, 1, Qt::AlignRight);
     layout->setSizeConstraint(QLayout::SetFixedSize);
 }

 bool EchoWindow::loadPlugin()
 {
     QDir pluginDirectory(qApp->applicationDirPath() + "/plugin/");
     QString fileName = pluginDirectory.entryList(
         QStringList() << "libechoplugin*").first();

     QPluginLoader pluginLoader(pluginDirectory.absoluteFilePath(fileName));
     QObject *plugin = pluginLoader.instance();
     if (plugin) {
         echoInterface = qobject_cast<EchoInterface *>(plugin);
     if(echoInterface)
         return true;
     }
     return false;
 }


Copyright © 2008 Trolltech Trademarks
Qt 4.3.5