PyQt5 QSpinBox - Getting Pixel ratio as floating value

PyQt5 QSpinBox - Getting Pixel ratio as floating value

To get the pixel ratio as a floating value in PyQt5 for a QSpinBox (or any QWidget), you can utilize the devicePixelRatioF() method of QWindow (or QScreen). This method returns the device pixel ratio as a floating point value, which can be more accurate than the integer returned by devicePixelRatio().

Here's how you can get the pixel ratio as a floating value for a QSpinBox:

import sys from PyQt5.QtWidgets import QApplication, QSpinBox, QWidget app = QApplication(sys.argv) window = QWidget() spinBox = QSpinBox(window) spinBox.setGeometry(50, 50, 150, 50) # Ensure the widget is shown or associated with a window/screen. window.show() # Get the pixel ratio as a floating value pixel_ratio_float = spinBox.window().windowHandle().screen().devicePixelRatioF() print("Pixel ratio (float):", pixel_ratio_float) sys.exit(app.exec_())

Make sure that the widget (in this case, the QSpinBox) is shown or at least associated with a window/screen before trying to retrieve the pixel ratio. Otherwise, the windowHandle() could return None, causing an AttributeError.

This pixel ratio value can be useful for creating High DPI aware applications, especially on systems or displays that support non-integer scaling factors.

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