如何将信号从QDialog发送到QMainWindow类

问题描述：

我制作了一个UI，其中包含一个主窗口和一个打开对话框窗口的按钮。我想将当前文本改变的信号从对话窗口中的行编辑作为变量发送到Mainwindow类。我正在制作的代码示例如下：如何将信号从QDialog发送到QMainWindow类

from PyQt5 import QtCore, QtGui, QtWidgets 
from selenium import webdriver 
import time 
import threading 
from bs4 import BeautifulSoup as soup 
import requests 

class Ui_Dialog(object): 
    def setupUi(self, Dialog): 
     Dialog.setObjectName("Dialog") 
     Dialog.resize(388, 179) 
     self.lineEdit_2 = QtWidgets.QLineEdit(Dialog) 
     self.lineEdit_2.setGeometry(QtCore.QRect(100, 100, 271, 21)) 
     font = QtGui.QFont() 
     font.setFamily("Yu Gothic") 
     self.lineEdit_2.setFont(font) 
     self.lineEdit_2.setStyleSheet("background-color: transparent;\n" 
"color: rgb(255, 255, 255);") 
     self.lineEdit_2.setObjectName("lineEdit_2") 

class Dialog(QtWidgets.QDialog, Ui_Dialog): 
    def __init__(self, parent=None): 
     QtWidgets.QDialog.__init__(self, parent) 
     self.setupUi(self) 

     # self.pushButton.pressed.connect(self.textEdit.clear) 
     # self.pushButton.pressed.connect(self.sejd) 

class Ui_MainWindow(object): 
    def setupUi(self, MainWindow): 
     self.keyworddict = {} 
     self.count = {} 
     MainWindow.setObjectName("MainWindow") 
     MainWindow.resize(803, 538) 
     MainWindow.setMinimumSize(QtCore.QSize(0, 0)) 
     MainWindow.setMaximumSize(QtCore.QSize(10000, 10000)) 
     self.centralWidget = QtWidgets.QWidget(MainWindow) 
     self.centralWidget.setObjectName("centralWidget") 
     self.pushButton = QtWidgets.QPushButton(self.centralWidget) 
     self.pushButton.setGeometry(QtCore.QRect(180, 210, 75, 23)) 
     font = QtGui.QFont() 
     font.setFamily("Yu Gothic") 
     font.setBold(True) 
     font.setWeight(75) 
     self.pushButton.setFont(font) 
     self.pushButton.setObjectName("pushButton") 
     MainWindow.setCentralWidget(self.centralWidget) 

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow): 
    def __init__(self, parent=None): 
     QtWidgets.QMainWindow.__init__(self, parent) 
     self.setupUi(self) 

     self.pushButton.pressed.connect(self.on_Button_clicked) 

    def on_Button_clicked(self): 
     dialog = QtWidgets.QDialog() 
     dialog.ui = Ui_Dialog() 
     dialog.ui.setupUi(dialog) 
     dialog.setWindowTitle("Login") 
     dialog.setAttribute(QtCore.Qt.WA_DeleteOnClose) 
     dialog.exec_() 

if __name__ == "__main__": 
    import sys 

    app = QtWidgets.QApplication(sys.argv) 
    w = MainWindow() 
    w.setWindowTitle("ui") 
    w.show() 
    sys.exit(app.exec_())

所有帮助表示赞赏。我最好喜欢使用上面的代码的例子。

答

至少有两种简单的方法可以做到这一点。您可以连接一个信号，创建对话框时，或者只是检索文本对话框关闭后：

class MainWindow(QtWidgets.QMainWindow, Ui_MainWindow): 
    ... 

    def dialogTextChanged(self, text): 
     print(text) 

    def on_Button_clicked(self): 
     dialog = QtWidgets.QDialog() 
     dialog.ui = Ui_Dialog() 
     dialog.ui.setupUi(dialog) 
     # connect signal to slot 
     dialog.ui.lineEdit_2.textChanged.connect(self.dialogTextChanged) 
     dialog.setWindowTitle("Login") 
     # this is not needed 
     # dialog.setAttribute(QtCore.Qt.WA_DeleteOnClose) 
     dialog.exec_() 
     # or retrieve text after dialog closes 
     print(dialog.ui.lineEdit_2.text()) 
     dialog.deleteLater()

如果这是一个登录对话框，你应该有一个接受按钮连接到对话框的accept()插槽。然后，您可以检查对话框的退出状态，如下所示：

if dialog.exec_() == QtWidgets.QDialog.Accepted: 
    text = dialog.ui.lineEdit_2.text() 
    # do sothing with text ... 
dialog.deleteLater()

如何将信号从QDialog发送到QMainWindow类

相关推荐