显示其他窗口的简单 PyQt4

Question

我正在尝试用三个按钮制作一个简单的小部件，单击每个按钮时都会显示相应的其他小部件。

以下是我尝试运行但无法弄清楚为什么新小部件未显示的代码。

from PyQt4 import QtGui, QtCore
from functools import partial
import sys


class MainWidget(QtGui.QWidget):
    def __init__(self):
       super(MainWidget, self).__init__()

       self.main_widget()

    def main_widget(self):
        another = Another()
        simple = Simple()
        grid = QtGui.QGridLayout()

        show_another_button = QtGui.QPushButton("Show Another")
        show_another_button.clicked.connect(another.show_another)
        grid.addWidget(show_another_button, 0, 0)

        show_simple_button = QtGui.QPushButton("Show Simple")
        show_simple_button.clicked.connect(simple.show_simple)
        grid.addWidget(show_simple_button, 0, 1)

        print_button = QtGui.QPushButton("Print Hello")
        print_button.clicked.connect(partial(print, "Hello"))
        grid.addWidget(another_button, 0, 2)

        self.setLayout(grid)

        self.show()


class Another(QtGui.QWidget):
    def __init__(self):
        print("another initialized")
        super(Another, self).__init__()

    def show_another(self):
        print("another called")
        grid = QtGui.QGridLayout()

        self.setLayout(grid)

        self.show()


class Simple(QtGui.QDialog):
    def __init__(self):
        print("simple initialized")
        super(Simple, self).__init__()

    def show_simple(self):
        print("simple called")
        self.show()

def main():
    app = QtGui.QApplication(sys.argv)
    main_widget = MainWidget()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

请帮忙！

Answer 1

稍微修改了您的代码。以下适用于我的系统。

from PyQt4 import QtGui
from functools import partial
import sys


class MainWidget(QtGui.QWidget):
    def __init__(self):
        super(MainWidget, self).__init__()

        self.another = Another()
        self.simple = Simple()
        self.grid = QtGui.QGridLayout()

        self.main_widget()

    def main_widget(self):
        show_another_button = QtGui.QPushButton("Show Another")
        show_another_button.clicked.connect(self.another.show_form)
        self.grid.addWidget(show_another_button, 0, 0)

        show_simple_button = QtGui.QPushButton("Show Simple")
        show_simple_button.clicked.connect(self.simple.show_simple)
        self.grid.addWidget(show_simple_button, 0, 1)

        another_button = QtGui.QPushButton("Print Hello")
        another_button.clicked.connect(partial(print, "Hello"))
        self.grid.addWidget(another_button, 0, 2)

        self.setLayout(self.grid)


class Another(QtGui.QWidget):
    def __init__(self):
        super(Another, self).__init__()
        print("another initialized")

    def show_form(self):
        print("another called")
        grid = QtGui.QGridLayout()

        self.setLayout(grid)

        self.show()


class Simple(QtGui.QDialog):
    def __init__(self):
        super(Simple, self).__init__()
        print("simple initialized")

    def show_simple(self):
        print("simple called")
        self.show()


def main():
    app = QtGui.QApplication(sys.argv)
    ex = MainWidget()
    ex.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

请注意：如果您在 Widget 仍处于打开状态时尝试启动 Another()，您将收到错误消息：

QWidget::setLayout: 试图在另一个“”上设置 QLayout“”，它已经有一个布局