Try to bring up a subwindow with PyQt5 and Python

Continuing from previous article, I will play with PyQt5.

This time I will open a sub window

First, output the sub window normally

test.py

#!/usr/bin/env python3

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


class MainWindow(QWidget):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        #Creating a button
        makeWindowButton = QPushButton("&make window")
        #Click event(makeWindow())Add
        makeWindowButton.clicked.connect(self.makeWindow)
        #Creating a layout
        layout = QHBoxLayout()
        #Adding buttons to the layout
        layout.addWidget(makeWindowButton)
        #Add layout to window
        self.setLayout(layout)

    def makeWindow(self):
        #Creating a subwindow
        subWindow = SubWindow()
        #Show subwindow
        subWindow.show()

class SubWindow(QWidget):
    def __init__(self, parent=None):
        #Is this the entity of the subwindow? Target. dialog
        self.w = QDialog(parent)
        label = QLabel()
        label.setText('Sub Window')
        layout = QHBoxLayout()
        layout.addWidget(label)
        self.w.setLayout(layout)

    def show(self):
        self.w.exec_()

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    main_window = MainWindow()

    main_window.show()
    sys.exit(app.exec_())

Instantiate a subwindow class in the parent window and show () to create a subwindow.

self.w = QDialog(parent) Here and there, it's important.

Without doing this, in the subwindow class self.setLayout(layout) No, it will cause an error.

Output of a subwindow that passes values to the calling class

There are probably situations where you want to output a subwindow and enter parameters. I'll try.

test.py

#!/usr/bin/env python3

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


class MainWindow(QWidget):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

        makeWindowButton = QPushButton("&make window")
        makeWindowButton.clicked.connect(self.makeWindow)

        self.label = QLabel()
        self.label.setText("default:")

        layout = QHBoxLayout()
        layout.addWidget(makeWindowButton)
        layout.addWidget(self.label)
        self.setLayout(layout)

    def makeWindow(self):
        subWindow = SubWindow(self)
        subWindow.show()

    #Run from subwindow
    def setParam(self, param):
        self.label.setText(param)

class SubWindow:
    def __init__(self, parent=None):
        self.w = QDialog(parent)
        self.parent = parent

        label = QLabel()
        label.setText('Sub Window')

        self.edit = QLineEdit()

        button = QPushButton('Send')
        button.clicked.connect(self.setParamOriginal)

        layout = QVBoxLayout()
        layout.addWidget(label)
        layout.addWidget(self.edit)
        layout.addWidget(button)

        self.w.setLayout(layout)

    #I'm passing a value to the parent window here
    def setParamOriginal(self):
        self.parent.setParam(self.edit.text())

    def show(self):
        self.w.exec_()

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    main_window = MainWindow()

    main_window.show()
    sys.exit(app.exec_())

I'm putting values from the subwindow to the label of the parent window. It's been 4 days for the first time in Python, and I haven't studied much about the Python language, so I was a little stuck because I didn't know how to handle self. I'm sorry the code is dirty.

Impressions / Discussion

PyQt It's really amazing, it's amazing ... I thought it was very convenient. I'm trying to read the reference, but I can't read it because I'm not fluent in English and I'm not used to Python yet. I have to become a little more Python. .. ..

Finally

Please excuse me because the code is dirty ...