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50
51#include <QtWidgets>
52
53class Notepad : public QWidget
54{
55 Q_OBJECT
56
57public:
58 Notepad();
59
60private slots:
61 void quit();
62
63private:
64 QTextEdit *textEdit;
65 QPushButton *quitButton;
66
67};
68
69Notepad::Notepad()
70{
71 textEdit = new QTextEdit;
72 quitButton = new QPushButton(tr(s: "Quit"));
73
74 connect(sender: quitButton, signal: &QPushButton::clicked,
75 receiver: this, slot: &Notepad::quit);
76
77 QVBoxLayout *layout = new QVBoxLayout;
78 layout->addWidget(textEdit);
79 layout->addWidget(quitButton);
80
81 setLayout(layout);
82
83 setWindowTitle(tr(s: "Notepad"));
84}
85
86void Notepad::quit()
87{
88 QMessageBox messageBox;
89 messageBox.setWindowTitle(tr(s: "Notepad"));
90 messageBox.setText(tr(s: "Do you really want to quit?"));
91 messageBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
92 messageBox.setDefaultButton(QMessageBox::No);
93 if (messageBox.exec() == QMessageBox::Yes)
94 qApp->quit();
95}
96
97int main(int argc, char **argv)
98{
99 QApplication app(argc, argv);
100
101 Notepad notepad;
102 notepad.show();
103
104 return app.exec();
105}
106
107#include "main.moc"
108
109

source code of qtbase/examples/widgets/tutorials/gettingStarted/gsQt/part3/main.cpp