Slider
----------

.. code-block:: python
    :caption: scripts/PYQT5/01_customize_widget/02_slider/main.py

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

    import sys
    from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QSlider
    from PyQt5.QtGui import QPalette, QColor
    from PyQt5.QtCore import Qt

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

            layout = QVBoxLayout()

            self.r_slider = QSlider(Qt.Horizontal)
            self.g_slider = QSlider(Qt.Horizontal)
            self.b_slider = QSlider(Qt.Horizontal)
            
            self.r_slider.setRange(0, 255)  # Set the range for red slider
            self.g_slider.setRange(0, 255)  # Set the range for green slider
            self.b_slider.setRange(0, 255)  # Set the range for blue slider

            layout.addWidget(self.r_slider)
            layout.addWidget(self.g_slider)
            layout.addWidget(self.b_slider)

            self.r_slider.valueChanged.connect(self.update_color)
            self.g_slider.valueChanged.connect(self.update_color)
            self.b_slider.valueChanged.connect(self.update_color)

            self.setLayout(layout)

        def update_color(self):
            r = self.r_slider.value()
            g = self.g_slider.value()
            b = self.b_slider.value()
            
            color = QColor(r, g, b)
            
            palette = self.palette()
            palette.setColor(QPalette.Window, color)
            self.setPalette(palette)
            self.setAutoFillBackground(True)

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


This example creates a PyQt5 widget where the background color changes dynamically as the user moves three sliders (red, green, blue).

- ``QSlider(Qt.Horizontal)``: Creates a horizontal slider. The three sliders adjust the values for red, green, and blue respectively.

- ``valueChanged.connect()``: Connects to the ``update_color`` method to be called every time the slider value changes.

- ``update_color``: Using the current values from the three sliders, it creates a new QColor object and sets the widget's background color to that color.