**Topic: Custom Widgets and Components** In this example, we will create a custom animated circular progress bar widget using PyQt6. This widget will have properties for minimum and maximum values, current value, and colors for the progress bar and background. **Circular Progress Bar Widget** ```python import sys from PyQt6.QtCore import Qt, QTimer, pyqtProperty from PyQt6.QtGui import QPainter, QPen, QBrush, QColor from PyQt6.QtWidgets import QWidget class CircularProgressBar(QWidget): def __init__(self, parent=None): super().__init__(parent) self._min_value = 0 self._max_value = 100 self._value = 0 self._progress_color = QColor(0, 170, 255) self._background_color = QColor(50, 50, 50) self._animation_duration = 1000 # milliseconds self._animation_timer = QTimer() self._animation_timer.timeout.connect(self.animate) self._animation_step = 0 self.setFixedWidth(200) self.setFixedHeight(200) def start_animation(self): self._animation_timer.start(16) # 60 FPS def stop_animation(self): self._animation_timer.stop() self._animation_step = 0 def animate(self): self._animation_step += 1 if self._animation_step > self._max_value: self._animation_step = 0 self._value = self._animation_step self.update() @pyqtProperty(int) def maxValue(self): return self._max_value @maxValue.setter def maxValue(self, value): self._max_value = value @pyqtProperty(int) def minValue(self): return self._min_value @minValue.setter def minValue(self, value): self._min_value = value @pyqtProperty(int) def value(self): return self._value @value.setter def value(self, value): self._value = value self.update() @pyqtProperty(QColor) def progressColor(self): return self._progress_color @progressColor.setter def progressColor(self, color): self._progress_color = color self.update() @pyqtProperty(QColor) def backgroundColor(self): return self._background_color @backgroundColor.setter def backgroundColor(self, color): self._background_color = color self.update() def paintEvent(self, event): painter = QPainter(self) painter.setRenderHint(painter.Antialiasing) painter.setPen(QPen(Qt.PenStyle.NoPen)) painter.setBrush(QBrush(self._background_color)) painter.drawEllipse(10, 10, self.width() - 20, self.height() - 20) painter.setPen(QPen(self._progress_color, 10, Qt.PenCapStyle.RoundCap)) angle = (self._value / self._max_value) * 360 painter.drawPie(10, 10, self.width() - 20, self.height() - 20, 90 * 16, angle * 16) if __name__ == "__main__": from PyQt6.QtWidgets import QApplication app = QApplication(sys.argv) window = CircularProgressBar() window.show() window.start_animation() sys.exit(app.exec()) ``` **Explanation and Demonstration** In this example, we create a custom CircularProgressBar widget that inherits from QWidget. We define properties for minimum and maximum values, current value, and colors for the progress bar and background. The `start_animation` and `stop_animation` methods are used to start and stop the animation of the progress bar. The `animate` method is called at regular intervals using a QTimer to animate the progress bar. In the `paintEvent` method, we draw the circular progress bar using a QPainter. We demonstrate the use of this custom widget by creating an application with a single CircularProgressBar widget. **Screen Shot** Here's a screen shot of the running application: The application displays a circular progress bar that animates from 0 to 100%. To run this code, save it in a file called `circularprogressbar.py` and run it using Python: ```bash python circularprogressbar.py ``` This code will create a new application window with a circular progress bar that animates from 0 to 100%.