import sys
from PyQt5.QtWidgets import (QWidget, QToolTip,QMessageBox,
QPushButton, QApplication,QDesktopWidget)
from PyQt5.QtGui import QFont,QIcon
from PyQt5.QtCore import QCoreApplication
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
QToolTip.setFont(QFont('SansSerif', 10))
self.setToolTip('This is a <b>QWidget</b> widget')
btn = QPushButton('退出', self)
btn.setToolTip('This is a <b>QPushButton</b> widget')
btn.resize(btn.sizeHint())
btn.move(50, 50)
btn.clicked.connect(QCoreApplication.instance().quit)
self.setGeometry(300, 300, 300, 200)
self.setWindowTitle('Tooltips')
self.setWindowIcon(QIcon('y7.png'))
self.center()
self.show()
def center(self):
qr = self.frameGeometry()
cp = QDesktopWidget().availableGeometry().center()
qr.moveCenter(cp)
self.move(qr.topLeft())
def closeEvent(self, event):
reply = QMessageBox.question(self, 'Message',
"Are you sure to quit?", QMessageBox.Yes |
QMessageBox.No, QMessageBox.No)
if reply == QMessageBox.Yes:
event.accept()
else:
event.ignore()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())