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50
51 #include "echowindow.h"
52
53 #include <QCoreApplication>
54 #include <QDir>
55 #include <QLabel>
56 #include <QLayout>
57 #include <QLineEdit>
58 #include <QMessageBox>
59 #include <QPluginLoader>
60 #include <QPushButton>
61
62 //! [0]
EchoWindow()63 EchoWindow::EchoWindow()
64 {
65 createGUI();
66 setLayout(layout);
67 setWindowTitle("Echo Plugin Example");
68
69 if (!loadPlugin()) {
70 QMessageBox::information(this, "Error", "Could not load the plugin");
71 lineEdit->setEnabled(false);
72 button->setEnabled(false);
73 }
74 }
75 //! [0]
76
77 //! [1]
sendEcho()78 void EchoWindow::sendEcho()
79 {
80 QString text = echoInterface->echo(lineEdit->text());
81 label->setText(text);
82 }
83 //! [1]
84
85 //! [2]
createGUI()86 void EchoWindow::createGUI()
87 {
88 lineEdit = new QLineEdit;
89 label = new QLabel;
90 label->setFrameStyle(QFrame::Box | QFrame::Plain);
91 button = new QPushButton(tr("Send Message"));
92
93 connect(lineEdit, &QLineEdit::editingFinished,
94 this, &EchoWindow::sendEcho);
95 connect(button, &QPushButton::clicked,
96 this, &EchoWindow::sendEcho);
97
98 layout = new QGridLayout;
99 layout->addWidget(new QLabel(tr("Message:")), 0, 0);
100 layout->addWidget(lineEdit, 0, 1);
101 layout->addWidget(new QLabel(tr("Answer:")), 1, 0);
102 layout->addWidget(label, 1, 1);
103 layout->addWidget(button, 2, 1, Qt::AlignRight);
104 layout->setSizeConstraint(QLayout::SetFixedSize);
105 }
106 //! [2]
107
108 //! [3]
loadPlugin()109 bool EchoWindow::loadPlugin()
110 {
111 QDir pluginsDir(QCoreApplication::applicationDirPath());
112 #if defined(Q_OS_WIN)
113 if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release")
114 pluginsDir.cdUp();
115 #elif defined(Q_OS_MAC)
116 if (pluginsDir.dirName() == "MacOS") {
117 pluginsDir.cdUp();
118 pluginsDir.cdUp();
119 pluginsDir.cdUp();
120 }
121 #endif
122 pluginsDir.cd("plugins");
123 const QStringList entries = pluginsDir.entryList(QDir::Files);
124 for (const QString &fileName : entries) {
125 QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(fileName));
126 QObject *plugin = pluginLoader.instance();
127 if (plugin) {
128 echoInterface = qobject_cast<EchoInterface *>(plugin);
129 if (echoInterface)
130 return true;
131 pluginLoader.unload();
132 }
133 }
134
135 return false;
136 }
137 //! [3]
138