[FIXED] How to make the Qt Widgets from a window auto-expand its size if the window was resized by the user?

Issue

I saw there is a solution if every widget is on a layout, but in my program I did't use any layouts. How can I make the QPushButtons and QLabels auto-resize if I resize the program's window?

Some code:

from PyQt5.QtWidgets import QApplication, QPushButton, QMainWindow, QLabel
from PyQt5 import QtCore
import sys

class Window(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("Resizable Widgets")
        self.setGeometry(500, 200, 300, 100)

        self.UiComponents()

        self.show()

    def UiComponents(self):
        label = QLabel("Label", self)
        label.setGeometry(0, 0, 300, 50)
        label.setAlignment(QtCore.Qt.AlignCenter | QtCore.Qt.AlignVCenter)

        button = QPushButton("Button", self)
        button.setGeometry(100, 50, 100, 40)

if __name__ == "__main__":
    App = QApplication(sys.argv)
    window = Window()
    sys.exit(App.exec_())

Solution

If you don’t use layouts, it might look like this:

import sys
from PyQt5.QtWidgets import QApplication, QPushButton, QMainWindow, QLabel
from PyQt5 import QtCore


class Window(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Resizable Widgets")
#        self.setGeometry(500, 200, 300, 100)

        self.w = 300
        self.h = 100
        self.resize(self.w, self.h)
        self.setMinimumSize(self.w/2, self.h/2)        
        self.widthFactor  = 1
        self.heightFactor = 1

        self.UiComponents()

    def UiComponents(self):
        self.label = QLabel("Label", self)
#        label.setGeometry(0, 0, 300, 50)
        self.label.setStyleSheet("font: {}pt Arial;".format(20*self.heightFactor))
        self.label.resize(self.w*self.widthFactor, self.h*0.25*self.heightFactor) 
        self.label.setAlignment(QtCore.Qt.AlignCenter) # | QtCore.Qt.AlignVCenter)

        self.button = QPushButton("Button", self)
#        button.setGeometry(100, 50, 100, 40)
        self.button.resize(self.w*0.25*self.widthFactor, self.h*0.2*self.heightFactor)

    def resizeEvent(self, event):
        self.widthFactor  = self.rect().width() / 300
        self.heightFactor = self.rect().height()/ 100        

        self.label.resize(self.w*self.widthFactor, self.h*0.25*self.heightFactor)
        self.label.move(self.rect().center() - self.label.rect().center() - QtCore.QPoint(0, self.h/4*self.heightFactor))
        self.label.setStyleSheet("font: {}pt Arial;".format(20*self.heightFactor))

        self.button.resize(self.w*0.25*self.widthFactor, self.h*0.2*self.heightFactor)
        self.button.move(self.rect().center() - self.button.rect().center() - QtCore.QPoint(0, -self.h*0.3*self.heightFactor))
        super(Window, self).resizeEvent(event)

if __name__ == "__main__":
    App = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(App.exec_())

Answered By - S. Nick