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PyQt5 QSpinBox – Connecting two spin boxes with each other

  • Last Updated : 17 May, 2020

In this article we will see how we can connect two spin boxes with each other such that every time value change in the one spin box should reflect in other spin box as well for example when we have fixed the width to height ratio of image and allow user to set width and height using spin box, as ratio is fixed therefore change in any dimension should also reflect in the other dimension.

Example :
Two spin box connected to each other such that there value should remain equal for every change of value occur in any of the spin box.

Steps for implementation :

1. Create two spin box
2. Add geometry to both the spin box
3. Add action to each spin box using valueChanged signal
4. Inside the first spin box action get the current value of spin box and set this value to the second spin box
5. Inside the second spin box action get the current value of spin box and set that value to the first spin box

Below is the implementation






# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # setting geometry
        self.setGeometry(100, 100, 600, 400)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
        # method for widgets
    def UiComponents(self):
  
        # creating spin box
        self.spin1 = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin1.setGeometry(100, 100, 150, 40)
  
        # setting prefix to spin
        self.spin1.setPrefix("Width : ")
  
        # add action to this spin box
        self.spin1.valueChanged.connect(self.action_spin1)
  
        # creating another spin box
        self.spin2 = QSpinBox(self)
  
        # setting geometry to spin box
        self.spin2.setGeometry(300, 100, 150, 40)
  
        # setting prefix to spin box
        self.spin2.setPrefix("Height : ")
  
        # add action to this spin box
        self.spin2.valueChanged.connect(self.action_spin2)
  
    # method called after editing finished
    def action_spin1(self):
  
        # getting current value of spin box
        current = self.spin1.value()
          
        # setting this value to second spin box
        self.spin2.setValue(current)
  
        # method called after editing finished
    def action_spin2(self):
        # getting current value of spin box
        current = self.spin2.value()
          
        # setting this value to the first spin box
        self.spin1.setValue(current)
  
  
# create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

Output :

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