PyQt：如何隐藏QMainWindow

Question

单击Dialog_01的按钮隐藏其窗口并打开Dialog_02。单击Dialog_02的按钮应关闭其窗口，并取消隐藏 Dialog_01。如何实现？

import sys, os
from PyQt4 import QtCore, QtGui    

class Dialog_02(QtGui.QMainWindow):
    def __init__(self):
        super(Dialog_02, self).__init__()

        myQWidget = QtGui.QWidget()
        myBoxLayout = QtGui.QVBoxLayout()       

        Button_02 = QtGui.QPushButton("Close THIS and Unhide Dialog 01")
        Button_02.clicked.connect(self.closeAndReturn)
        myBoxLayout.addWidget(Button_02)

        myQWidget.setLayout(myBoxLayout)
        self.setCentralWidget(myQWidget)
        self.setWindowTitle('Dialog 02')

    def closeAndReturn(self):
        self.close()

class Dialog_01(QtGui.QMainWindow):
    def __init__(self):
        super(Dialog_01, self).__init__()

        myQWidget = QtGui.QWidget()
        myBoxLayout = QtGui.QVBoxLayout()       

        Button_01 = QtGui.QPushButton("Hide THIS and Open Dialog 02")
        Button_01.clicked.connect(self.callAnotherQMainWindow)
        myBoxLayout.addWidget(Button_01)        

        myQWidget.setLayout(myBoxLayout)
        self.setCentralWidget(myQWidget)
        self.setWindowTitle('Dialog 01')

    def callAnotherQMainWindow(self):
        self.hide()
        self.dialog_02 = Dialog_02()
        self.dialog_02.show()
        self.dialog_02.raise_()

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    dialog_1 = Dialog_01()
    dialog_1.show()
    sys.exit(app.exec_())

Answer 1

将第一个窗口作为第二个窗口的父项：

class Dialog_02(QtGui.QMainWindow):
    def __init__(self, parent):
        super(Dialog_02, self).__init__(parent)
        # ensure this window gets garbage-collected when closed
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
    ...    

    def closeAndReturn(self):
        self.close()
        self.parent().show()

class Dialog_01(QtGui.QMainWindow):
    ...

    def callAnotherQMainWindow(self):
        self.hide()
        self.dialog_02 = Dialog_02(self)
        self.dialog_02.show()

如果您希望每次都显示相同的对话框，请执行以下操作：

    def callAnotherQMainWindow(self):
        self.hide()
        if not hassattr(self, 'dialog_02'):
            self.dialog_02 = Dialog_02(self)
        self.dialog_02.show()

和hide()子窗口，而不是关闭它。

Answer 2

替代解决方案：

from PyQt4 import QtGui
import sys


class ChildWindow(QtGui.QMainWindow):

    def __init__(self, parent=None):
        super().__init__(parent)
        self.parent = parent
        self.show()

    def closeEvent(self, QCloseEvent):
        self.parent.setWindowOpacity(1.)


class MainWindow(QtGui.QMainWindow):

    def __init__(self):
        super().__init__()
        self.button = QtGui.QPushButton("Open Child Window", self)
        self.button.clicked.connect(self.callAnotherQMainWindow)
        self.show()

    def callAnotherQMainWindow(self):
        win = ChildWindow(self)
        self.setWindowOpacity(0.)


def run():

    app = QtGui.QApplication(sys.argv)
    win = MainWindow()
    sys.exit(app.exec_())


run()