PyQt5 QDoubleSpinBox - Getting Current Value

PyQt5 QDoubleSpinBox - Getting Current Value

In PyQt5, a QDoubleSpinBox is a widget that allows the user to select a floating-point number. You can retrieve the current value of a QDoubleSpinBox using the value() method. Here's a step-by-step guide on how to use QDoubleSpinBox and get its current value:

Step 1: Install PyQt5

If you haven't already installed PyQt5, you can install it using pip:

pip install PyQt5

Step 2: Import PyQt5 Modules

Import the necessary modules from PyQt5:

from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QDoubleSpinBox, QPushButton, QLabel import sys

Step 3: Create the Application and Main Window

Set up the main application and the main window:

app = QApplication(sys.argv) window = QWidget() window.setWindowTitle('QDoubleSpinBox Example')

Step 4: Create a QDoubleSpinBox

Create a QDoubleSpinBox and set its range, if necessary:

double_spin_box = QDoubleSpinBox(window) double_spin_box.setRange(0, 100) # Set the range between 0 and 100 double_spin_box.setSingleStep(0.1) # Set the step size to 0.1

Step 5: Create a Function to Retrieve the Value

Define a function that gets called when you want to retrieve the value:

def get_value(): current_value = double_spin_box.value() label.setText(f"Current Value: {current_value}")

Step 6: Add a Button to Trigger Value Retrieval

Create a button that, when clicked, will call the function to get the value:

button = QPushButton("Get Value", window) button.clicked.connect(get_value)

Step 7: Add a Label to Display the Value

Create a label to display the value:

label = QLabel("Current Value: 0", window)

Step 8: Set the Layout and Show the Window

Organize the widgets in a layout and display the window:

layout = QVBoxLayout() layout.addWidget(double_spin_box) layout.addWidget(button) layout.addWidget(label) window.setLayout(layout) window.show()

Step 9: Run the Application

Execute the application's main loop:

sys.exit(app.exec_())

Complete Example Code

Here's the complete code:

from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QDoubleSpinBox, QPushButton, QLabel import sys def get_value(): current_value = double_spin_box.value() label.setText(f"Current Value: {current_value}") app = QApplication(sys.argv) window = QWidget() window.setWindowTitle('QDoubleSpinBox Example') double_spin_box = QDoubleSpinBox(window) double_spin_box.setRange(0, 100) # Set the range between 0 and 100 double_spin_box.setSingleStep(0.1) # Set the step size to 0.1 button = QPushButton("Get Value", window) button.clicked.connect(get_value) label = QLabel("Current Value: 0", window) layout = QVBoxLayout() layout.addWidget(double_spin_box) layout.addWidget(button) layout.addWidget(label) window.setLayout(layout) window.show() sys.exit(app.exec_())

When you run this code, you'll see a window with a QDoubleSpinBox, a button, and a label. Adjusting the spin box and clicking the button will update the label with the current value of the spin box.

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