Mastering GUI Programming with Python

Implementing sound playback

Our SoundWidget class is going to be a QWidget object that manages a single sound sample. When finished, it will allow us to load or record an audio sample, play it back looped or as a one-shot, and control its volume and playback position.

Above the MainWindow constructor, let's create the class and give it a layout:

class SoundWidget(qtw.QWidget):    def __init__(self):        super().__init__()        self.setLayout(qtw.QGridLayout())        self.label = qtw.QLabel("No file loaded")        self.layout().addWidget(self.label, 0, 0, 1, 2)

The first thing we've added is a label that will display the name of the sample file the widget has loaded. The next thing we need is a button to control the playback. Instead of just a plain push button, ...