PyQt5 QDial - Getting Slider's Value

PyQt5 QDial - Getting Slider's Value

In PyQt5, QDial is a widget that provides a rounded range control (like a knob in a mixer). You can get the value of the QDial using the value() method, which is part of the QAbstractSlider class from which QDial inherits. Here's a basic example of how you can use QDial and retrieve its value.

Basic PyQt5 QDial Example

import sys from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QLabel, QDial class MyApp(QWidget): def __init__(self): super().__init__() # Create a QDial self.dial = QDial(self) self.dial.setMinimum(0) self.dial.setMaximum(100) self.dial.setValue(30) self.dial.valueChanged.connect(self.dial_value_changed) # Create a label to display the value self.label = QLabel('30', self) # Set layout layout = QVBoxLayout() layout.addWidget(self.dial) layout.addWidget(self.label) self.setLayout(layout) self.setWindowTitle('QDial Example') self.setGeometry(300, 300, 300, 200) def dial_value_changed(self): value = self.dial.value() self.label.setText(str(value)) if __name__ == '__main__': app = QApplication(sys.argv) ex = MyApp() ex.show() sys.exit(app.exec_())

Explanation

  • QDial Creation: A QDial is created and its minimum, maximum, and initial values are set.
  • Event Connection: The valueChanged signal of QDial is connected to the dial_value_changed method. This method is called whenever the dial's value changes.
  • Getting the Value: Inside dial_value_changed, self.dial.value() is called to get the current value of the dial.
  • Displaying the Value: The value is then converted to a string and set as the text of a QLabel to display it.

Running the Example

To run this example:

  1. Ensure you have PyQt5 installed. If not, you can install it via pip:
    pip install pyqt5
  2. Copy the code into a Python file.
  3. Run the script. You should see a window with a dial and a label displaying the dial's current value.

As you interact with the QDial, the label will update to show the current value. This is a basic demonstration, but you can expand upon it depending on your application's requirements.

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