A QDialog
有自己的事件循环,因此它可以与主应用程序分开运行。
您只需检查对话框的返回代码即可决定是否应运行主应用程序。
示例代码(PyQt5):
from PyQt5 import QtWidgets
# from mainwindow import Ui_MainWindow
class Login(QtWidgets.QDialog):
def __init__(self, parent=None):
super(Login, self).__init__(parent)
self.textName = QtWidgets.QLineEdit(self)
self.textPass = QtWidgets.QLineEdit(self)
self.buttonLogin = QtWidgets.QPushButton('Login', self)
self.buttonLogin.clicked.connect(self.handleLogin)
layout = QtWidgets.QVBoxLayout(self)
layout.addWidget(self.textName)
layout.addWidget(self.textPass)
layout.addWidget(self.buttonLogin)
def handleLogin(self):
if (self.textName.text() == 'foo' and
self.textPass.text() == 'bar'):
self.accept()
else:
QtWidgets.QMessageBox.warning(
self, 'Error', 'Bad user or password')
class Window(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(Window, self).__init__(parent)
# self.ui = Ui_MainWindow()
# self.ui.setupUi(self)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
login = Login()
if login.exec_() == QtWidgets.QDialog.Accepted:
window = Window()
window.show()
sys.exit(app.exec_())
示例代码(PyQt4):
from PyQt4 import QtGui
# from mainwindow import Ui_MainWindow
class Login(QtGui.QDialog):
def __init__(self, parent=None):
super(Login, self).__init__(parent)
self.textName = QtGui.QLineEdit(self)
self.textPass = QtGui.QLineEdit(self)
self.buttonLogin = QtGui.QPushButton('Login', self)
self.buttonLogin.clicked.connect(self.handleLogin)
layout = QtGui.QVBoxLayout(self)
layout.addWidget(self.textName)
layout.addWidget(self.textPass)
layout.addWidget(self.buttonLogin)
def handleLogin(self):
if (self.textName.text() == 'foo' and
self.textPass.text() == 'bar'):
self.accept()
else:
QtGui.QMessageBox.warning(
self, 'Error', 'Bad user or password')
class Window(QtGui.QMainWindow):
def __init__(self, parent=None):
super(Window, self).__init__(parent)
# self.ui = Ui_MainWindow()
# self.ui.setupUi(self)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
login = Login()
if login.exec_() == QtGui.QDialog.Accepted:
window = Window()
window.show()
sys.exit(app.exec_())