PyQt5 QSpinBox - Making updates

PyQt5 QSpinBox - Making updates

In PyQt5, a QSpinBox widget is used for allowing users to select from a range of integer values. To make updates to the QSpinBox, such as changing its range, current value, or responding to value changes, you can use various methods provided by the QSpinBox class.

Here's an example of how to create a QSpinBox in a PyQt5 application and make updates to it, such as setting its range, current value, and connecting a function to handle value changes:

Step 1: Install PyQt5

If not already installed, you can install PyQt5 using pip:

pip install PyQt5

Step 2: Create a Basic PyQt5 Application with QSpinBox

import sys from PyQt5.QtWidgets import QApplication, QWidget, QSpinBox, QVBoxLayout, QLabel class DemoApp(QWidget): def __init__(self): super().__init__() # Create a QVBoxLayout instance layout = QVBoxLayout() # Create a QSpinBox self.spinBox = QSpinBox(self) # Set range of the spin box self.spinBox.setRange(1, 100) # Set initial value self.spinBox.setValue(10) # Connect the valueChanged signal to a custom slot self.spinBox.valueChanged.connect(self.value_changed) # Add the spin box to the layout layout.addWidget(self.spinBox) # Create a label to display the spin box value self.label = QLabel("Current value: 10", self) layout.addWidget(self.label) # Set the layout for the main window self.setLayout(layout) self.setWindowTitle("QSpinBox Example") def value_changed(self, value): # Update the label when the spin box value changes self.label.setText(f"Current value: {value}") # Run the application if __name__ == "__main__": app = QApplication(sys.argv) demo = DemoApp() demo.show() sys.exit(app.exec_())

In this example:

  • We create a QWidget window that contains a QSpinBox.
  • The setRange method is used to set the range of the spin box (from 1 to 100).
  • The setValue method sets the initial value of the spin box.
  • We connect the valueChanged signal of the QSpinBox to a custom method (value_changed), which updates a label every time the value changes.

When you run this script, a window with a spin box and a label will appear. Changing the value of the spin box will update the label accordingly. This demonstrates how to make updates to a QSpinBox and respond to user interactions in a PyQt5 application.

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