Make Global Variable For All Forms In Python Pyqt

Question

Can I make a global variable in QMainWindow and pass a value for it, and then get the value and print it in another form [QDialog] that i can open it with a button in QMainWindow?

Include snippets of your code with some comments explaining what you want to happen where please. — Woohoojin, Aug 01 '18 at 19:28
i want to make global variable for all forms in pyqt5 , i mean that i can use it in any form — Mostafa M. Mead, Aug 01 '18 at 19:30

score 0 · Answer 1 · answered Aug 01 '18 at 21:21

Try it:

import sys
from PyQt5.QtGui     import *
from PyQt5.QtCore    import *
from PyQt5.QtWidgets import *

class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setWindowIcon(self.style().standardIcon(QStyle.SP_TitleBarMenuButton)) 
        self.resize(300, 150)

        centerWidget = QWidget()
        layout       = QVBoxLayout()

        self.setStyleSheet('background-color : rgb(255,255,255);')
        self.setWindowTitle('MainWindow')

        self.lineEdit = QLineEdit("Type here what you want to transfer for [qdialog].")

        self.pushButton = QPushButton(self) 
        self.pushButton.setStyleSheet('background-color: rgb(255,0,0); color: #fff')
        self.pushButton.setText('Pass a value for [qdialog]')
        self.pushButton.clicked.connect(self.A)

        layout.addWidget(self.lineEdit)
        layout.addWidget(self.pushButton)
        centerWidget.setLayout(layout)
        self.setCentralWidget(centerWidget)

    def A(self):
        self.cams = Form(self.lineEdit.text()) 
        self.cams.show()
        self.close()

class Form(QDialog):
    def __init__(self, value, parent=None):
        super().__init__(parent)
        self.setWindowTitle('Form(QDialog)')
        self.setWindowIcon(self.style().standardIcon(QStyle.SP_FileDialogInfoView))

        label1 = QLabel(value)
        self.button = QPushButton()
        self.button.setSizePolicy(QSizePolicy.Minimum, QSizePolicy.Expanding)
        self.button.setIcon(self.style().standardIcon(QStyle.SP_ArrowLeft))
        self.button.setIconSize(QSize(200, 200))

        layoutV = QVBoxLayout()
        self.pushButton = QPushButton(self)
        self.pushButton.setStyleSheet('background-color: rgb(0,0,255); color: #fff')
        self.pushButton.setText('Click me!')
        self.pushButton.clicked.connect(self.B)
        layoutV.addWidget(self.pushButton)

        layoutH = QHBoxLayout()
        layoutH.addWidget(label1)
        layoutH.addWidget(self.button)
        layoutV.addLayout(layoutH)
        self.setLayout(layoutV)

    def B(self):
        self.cams = MainWindow()
        self.cams.show()
        self.close() 

if __name__ == '__main__':
    myApp = QApplication(sys.argv)
    myMainWindow = MainWindow()
    myMainWindow.show()
    myApp.exec_()

Make Global Variable For All Forms In Python Pyqt

1 Answers1