PyQt5 Label - Checking if shadow is widget type

PyQt5 Label - Checking if shadow is widget type

In PyQt5, when you apply a shadow effect (like QGraphicsDropShadowEffect) to a widget (such as QLabel), you're not changing the type of the widget. Instead, you're simply applying a graphical effect to the widget's rendering.

If you want to check whether a QLabel (or any other widget) has a shadow effect applied to it, you would verify the type of its graphics effect. However, the shadow effect itself is not a "widget type".

Here's how you can check if a QLabel has a QGraphicsDropShadowEffect applied to it:

import sys from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow, QGraphicsDropShadowEffect from PyQt5.QtCore import Qt class App(QMainWindow): def __init__(self): super().__init__() # Create a QLabel self.label = QLabel("Hello, PyQt5!", self) self.label.move(50, 50) self.label.resize(200, 40) # Create and apply a shadow effect shadow_effect = QGraphicsDropShadowEffect(self.label) shadow_effect.setOffset(5, 5) self.label.setGraphicsEffect(shadow_effect) # Check if label has a shadow effect effect = self.label.graphicsEffect() if isinstance(effect, QGraphicsDropShadowEffect): print("The label has a shadow effect!") else: print("The label does not have a shadow effect.") self.setGeometry(100, 100, 400, 300) if __name__ == "__main__": app = QApplication(sys.argv) window = App() window.show() sys.exit(app.exec_())

In the example above, after applying the shadow effect to the QLabel, we check its graphics effect and verify if it's an instance of QGraphicsDropShadowEffect. If it is, we print a message indicating that the label has a shadow effect.

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