**Custom Widgets and Components: Creating a Customizable Audio Waveform Widget** In this example, we'll create a custom audio waveform widget using PyQt6. This widget will display an audio waveform and allow users to interact with it. **AudioWaveformWidget.py** ```python import sys import math from PyQt6.QtCore import Qt, QPoint, QRect from PyQt6.QtGui import QPainter, QPen, QBrush, QColor from PyQt6.QtWidgets import QWidget class AudioWaveformWidget(QWidget): def __init__(self, audio_data): super().__init__() self.audio_data = audio_data self.width = 800 self.height = 200 self.playhead_position = 0 self.initUI() def initUI(self): self.setGeometry(100, 100, self.width, self.height) self.setStyleSheet("background-color: #f0f0f0;") def paintEvent(self, event): qp = QPainter() qp.begin(self) self.drawWaveform(qp) qp.end() def drawWaveform(self, qp): waveform_height = self.height - 40 waveform_width = self.width - 20 # Draw waveform background qp.setBrush(QBrush(QColor(240, 240, 240))) qp.drawRect(QRect(10, 10, waveform_width, waveform_height)) # Draw waveform qp.setPen(QPen(QColor(0, 0, 0), 2)) waveform_x = 15 waveform_y = waveform_height / 2 + 15 for sample in self.audio_data: waveform_y = waveform_height / 2 + 15 - (sample * waveform_height / 2) qp.drawLine(waveform_x, waveform_y, waveform_x + 1, waveform_y) waveform_x += 1 # Draw playhead qp.setPen(QPen(QColor(255, 0, 0), 2)) playhead_x = int(self.playhead_position * waveform_width / len(self.audio_data)) + 15 qp.drawLine(playhead_x, 10, playhead_x, self.height - 10) def mousePressEvent(self, event): waveform_width = self.width - 20 self.playhead_position = (event.pos().x() - 15) / waveform_width * len(self.audio_data) self.update() def wheelEvent(self, event): if event.angleDelta().y() > 0: self.playhead_position -= 100 else: self.playhead_position += 100 if self.playhead_position < 0: self.playhead_position = 0 elif self.playhead_position > len(self.audio_data): self.playhead_position = len(self.audio_data) self.update() ``` **main.py** ```python import sys from PyQt6.QtWidgets import QApplication from AudioWaveformWidget import AudioWaveformWidget def main(): audio_data = [math.sin(i * 0.1) for i in range(1000)] app = QApplication(sys.argv) waveform_widget = AudioWaveformWidget(audio_data) waveform_widget.show() sys.exit(app.exec()) if __name__ == "__main__": main() ``` **Example Use Case:** 1. Create an audio waveform widget with 1000 audio samples. 2. Display the waveform and interact with it by clicking on the waveform to change the playhead position. 3. Use the mouse wheel to scroll through the waveform. **Tips and Variations:** * Add audio playback functionality by connecting the playhead position to an audio player. * Use a more sophisticated algorithm to generate the audio waveform, such as the Fast Fourier Transform (FFT). * Add additional features, such as zooming and panning, to the waveform widget. * Use this widget as a component in a larger audio editing or music production application. **Illustration:** A waveform widget with a red playhead and black waveform on a gray background. I hope this example demonstrates how to create a custom audio waveform widget using PyQt6!