echowindow.cpp Example File

tools/echoplugin/echowindow/echowindow.cpp
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#include <QtWidgets> #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, &QLineEdit::editingFinished, this, &EchoWindow::sendEcho); connect(button, &QPushButton::clicked, this, &EchoWindow::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 pluginsDir(qApp->applicationDirPath()); #if defined(Q_OS_WIN) if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release") pluginsDir.cdUp(); #elif defined(Q_OS_MAC) if (pluginsDir.dirName() == "MacOS") { pluginsDir.cdUp(); pluginsDir.cdUp(); pluginsDir.cdUp(); } #endif pluginsDir.cd("plugins"); foreach (QString fileName, pluginsDir.entryList(QDir::Files)) { QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(fileName)); QObject *plugin = pluginLoader.instance(); if (plugin) { echoInterface = qobject_cast<EchoInterface *>(plugin); if (echoInterface) return true; } } return false; }