在 PyQt 的子窗口中从父窗口访问数据 [英] Access data from the parent window in a child window in PyQt

问题描述

我有两个同名的窗口(App.py 和 ChildApp.py)和 .ui 文件.

I have two windows (App.py and ChildApp.py) and .ui files for both with same name.

App.py:

import sys
from PyQt4 import QtCore, QtGui, uic
from ChildApp import ChildApp
qtCreatorFile = "App.ui" # Enter file here.
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)
class App(QtGui.QMainWindow, Ui_MainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        Ui_MainWindow.__init__(self)
        self.setupUi(self)
        self.message = None
        self.child_window = ChildApp()
        self.pushButton.clicked.connect(self.sendMessage)
    def sendMessage(self):
        self.message = self.lineEdit.text()
        self.child_window.show()
if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    window = App()
    window.show()
    sys.exit(app.exec_())

ChildApp.py:

ChildApp.py:

import sys
from PyQt4 import QtCore, QtGui, uic
qtCreatorFile = "ChildApp.ui" # Enter file here.
Ui_MainWindow, QtBaseClass = uic.loadUiType(qtCreatorFile)
class ChildApp(QtGui.QMainWindow, Ui_MainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        Ui_MainWindow.__init__(self)
        self.setupUi(self)
        self.pushButton.clicked.connect(self.alertmessage)
    def alertmessage(self):
        message = "test"
        self.label.setText("Message : "+message)
if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    window = ChildApp()
    window.show()
    sys.exit(app.exec_())

在 Main.py 文件中，我有一个变量 self.message.当我点击Do something with text"按钮时，文本框中的文本被分配给 self.message 并打开子窗口.

In Main.py file I have a variable self.message. When I click on the button "Do something with text", text in the textbox is assigned to self.message and the child window is opened.

现在在子窗口中，当我单击显示消息"按钮时，将调用方法 alertmessage()，它设置 message = "text".必须将此变量 message 分配给 MainApp.py 中的 self.message 值.

Now in the child window, when I click on button "Show message", the method alertmessage() is called, where it sets message = "text". This variable message must be assigned to value of self.message from MainApp.py.

请帮忙

谢谢

推荐答案

这样称呼孩子:

    self.child_window = ChildApp(parent=self)

以这种方式定义子应用:

Define the child app this way:

class ChildApp(QtGui.QMainWindow, Ui_MainWindow):
    def __init__(self, parent):
        self.parent = parent

你可以通过self.parent.whatever

它必须有效，但我不建议这样做，因为您不应该知道父级和子级的字段.

It must work, but I wouldn't advise this because you are not supposed to know the fields of the parent form the child.

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