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如何将信号从QDialog发送到QMainWindow类

signals-slots pyqt5 signals python-3.x multithreading

Kermit · 技术社区 · 8 年前

我已经做了一个用户界面,其中包括一个主窗口和一个按钮,打开一个对话框窗口。我想将当前文本更改信号作为变量从对话框窗口中的行编辑发送到主窗口类。我正在编写的代码示例如下:

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_())

感谢所有帮助。我更喜欢使用上述代码的示例。

1 回复 | 直到 8 年前

ekhumoro 8 年前

至少有两种简单的方法可以做到这一点。您可以在创建对话框时连接信号,也可以在对话框关闭后检索文本:

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()

accept() 狭槽然后,您可以像这样检查对话框的退出状态:

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