Background
-------------


.. code-block:: python
    :caption: scripts/PYQT4/01_customize_widget/01_random_background/main.py

    # -*- coding: utf-8 -*-

    import sys
    import random
    from PyQt5.QtWidgets import QApplication, QWidget
    from PyQt5.QtGui import QPalette, QColor

    class ColorChangingWidget(QWidget):
        def __init__(self):
            super(ColorChangingWidget, self).__init__()

            self.init_ui()

        def init_ui(self):
            self.setWindowTitle('Click to Change Color')
            self.setGeometry(100, 100, 400, 300)

        def mousePressEvent(self, event):
            # 무작위 색상으로 배경색 설정
            random_color = QColor(random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))
            
            palette = self.palette()
            palette.setColor(QPalette.Window, random_color)
            self.setPalette(palette)

    if __name__ == '__main__':
        app = QApplication(sys.argv)
        window = ColorChangingWidget()
        window.show()
        sys.exit(app.exec_())









In this example, a custom widget, ``ColorChangingWidget``, is created by inheriting from ``QWidget``.

- By overriding the ``mousePressEvent`` method, it implements the functionality to change the widget's background color to a random color every time the widget is clicked.
  
- The color change is performed using a ``QPalette`` object.
   ...