如何在另一個類的 mdi 子窗口中設置 qlineedit 的文本？

Question

我正在使用 python 和 pyqt6。

我有一個 maindwindow A，它有一個 mdi 區域，它有一個子窗口，有一個 qlineedt 和一個按鈕，當我按下按鈕時，會出現一個彈出窗口，這是同一程序中的另一個類，彈出窗口有 qlineedit 和一個按鈕，當我在 qlineedit 中輸入一個值並按下按鈕時，彈出窗口關閉並且 qlineedit 的值被傳輸到子窗口的 qlineedit，我嘗試了以下代碼：

A.subwindow.settext(self.textedit.text())

但它不起作用。 錯誤是“qmainwindow A 沒有屬性子窗口”我也試過這個：

A.mdi.subwindow.settext(self.textedit.text())

錯誤是“qmainwindow A has no attribute mdi” 我將 mdi 聲明為：

self.mdi = QMdiArea()
windowLayout.addWidget(self.mdi)

子窗口為：

self.subwindow = QMdiSubWindow()
self.mdi.addSubWindow(self.subwindow)
self.subwindow.show()  

這是產生相同錯誤的最小代碼：

import PyQt6.QtWidgets   as qtw
import PyQt6.QtCore as qtc
import sys 
import os 

class Minwindow(qtw.QMainWindow): 
    def __init__(self):
        super().__init__()
        self.mdi = qtw.QMdiArea()
        widget = qtw.QWidget()
        self.setCentralWidget(widget)
        windowLayout = qtw.QHBoxLayout(widget)
        windowLayout.addWidget(self.mdi, )
        
        pbSub = qtw.QPushButton('Sub', self)
        pbSub.setGeometry(9, 9, 75, 20)
        pbSub.clicked.connect(self.on_click_sub)
        self.setGeometry(125,75,350,300)
    def on_click_sub(self):
        self.subw = qtw.QMdiSubWindow()
        self.subw.txtusr = qtw.QLineEdit('', self.subw)
        self.subw.txtusr.setGeometry(25,30,100,25)
        pbPop = qtw.QPushButton('Pop', self.subw)
        pbPop.setGeometry(50, 75, 75, 20)
        pbPop.clicked.connect(self.on_click_pop)
        self.subw.setGeometry(75, 75, 200, 150)
        self.subw.setWindowTitle("Create User")
        self.mdi.addSubWindow(self.subw)
        self.subw.show() 
    def on_click_pop(self):        
        self.showPopup()
    def showPopup(self):
        name = 'POPS'
        self.dpop = Popw(name)        
        self.dpop.move(self.pos().x()+75, self.pos().y()+75)
        self.dpop.setFixedSize(200, 150)
        self.dpop.show()   
class Popw(qtw.QMainWindow):
    def __init__(self, name):
        super().__init__()        
        self.name = name
        #self.setGeometry(100, 100, 300, 350)
        self.setWindowFlags(qtc.Qt.WindowType.Window | qtc.Qt.WindowType.CustomizeWindowHint | qtc.Qt.WindowType.WindowStaysOnTopHint)
        self.initUI()
    def initUI(self):
        ntxtusr = qtw.QLineEdit('', self)
        ntxtusr.setGeometry(25,30,100,25)
        pbOk = qtw.QPushButton('Ok', self)
        pbOk.setGeometry(50, 75, 75, 20)
        pbOk.clicked.connect(self.on_click_ok) 
    def on_click_ok(self):
        Minwindow.mdi.subw.txtusr.setText(ntxtusr.text())
        self.close()
    
if __name__ == "__main__":       
    app = qtw.QApplication(sys.argv)
 
    mainl = Minwindow()
    mainl.show()
    sys.exit(app.exec())        
        

Answer 1

我已經通過引入一個全局變量來解決這個問題，並將彈出窗口的 qlineedit 中的文本值傳遞給這個全局變量，在 qtimer 中，如果全局變量不為空，它將更新 mdi 子窗口的 qlineedit 中的文本。

這是其余的代碼：

import PyQt6.QtWidgets   as qtw
import PyQt6.QtCore as qtc
import sys 

ntexx = ''
class Minwindow(qtw.QMainWindow): 
    def __init__(self):
        super().__init__()
        self.mdi = qtw.QMdiArea()
        widget = qtw.QWidget()
        self.setCentralWidget(widget)
        windowLayout = qtw.QHBoxLayout(widget)
        windowLayout.addWidget(self.mdi, )
        
        pbSub = qtw.QPushButton('Sub', self)
        pbSub.setGeometry(9, 9, 75, 20)
        pbSub.clicked.connect(self.on_click_sub)
        timer = qtc.QTimer(self) 
        # adding action to timer
        timer.timeout.connect(self.showTime)  
        # update the timer every second
        timer.start(500)
        
        self.setGeometry(125,75,350,300)
    def showTime(self):
        global ntexx
        if ntexx != '':
           self.subw.txtusr.setText(ntexx)
           ntexx = ''
        
    def on_click_sub(self):
        self.subw = qtw.QMdiSubWindow()
        self.subw.txtusr = qtw.QLineEdit('', self.subw)
        self.subw.txtusr.setGeometry(25,30,100,25)
        pbPop = qtw.QPushButton('Pop', self.subw)
        pbPop.setGeometry(50, 75, 75, 20)
        pbPop.clicked.connect(self.on_click_pop)
        self.subw.setGeometry(75, 75, 200, 150)
        self.subw.setWindowTitle("Create User")
        self.mdi.addSubWindow(self.subw)
        self.subw.show() 
    def on_click_pop(self):        
        self.showPopup()
 
    def showPopup(self):
        name = 'POPS'
        self.dpop = Popw(name)        
        self.dpop.move(self.pos().x()+75, self.pos().y()+75)
        self.dpop.setFixedSize(200, 150)
        self.dpop.show()   
class Popw(qtw.QMainWindow):
    def __init__(self, name):
        super().__init__()        
        self.name = name
        #self.setGeometry(100, 100, 300, 350)
        self.setWindowFlags(qtc.Qt.WindowType.Window | qtc.Qt.WindowType.CustomizeWindowHint | qtc.Qt.WindowType.WindowStaysOnTopHint)
        self.initUI()
    def initUI(self):
        self.ntxtusr = qtw.QLineEdit('', self)
        self.ntxtusr.setGeometry(25,30,100,25)
        pbOk = qtw.QPushButton('Ok', self)
        pbOk.setGeometry(50, 75, 75, 20)
        pbOk.clicked.connect(self.on_click_ok) 
    def on_click_ok(self):
        #Minwindow.mdi.subw.txtusr.setText(ntxtusr.text())
        global ntexx
        ntexx = self.ntxtusr.text()
        self.close()
    
if __name__ == "__main__":       
    app = qtw.QApplication(sys.argv)
 
    mainl = Minwindow()
    mainl.show()
    sys.exit(app.exec())