Qt 4.3: echowindow.cpp Example File (tools/echoplugin/echowindow/echowindow.cpp)

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

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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;
     }