def keyPressEvent(self, event: QKeyEvent) -> None:
"""Process key events. The :py:class:`QImageView` supports
the following keys:
?: debug
t: debug toolbox
"""
key, text = event.key(), event.text()
print(f"debug: QDebug[{type(self).__name__}].keyPressEvent: "
f"key={key}, text={text}")
if text == '?':
self.debug()
elif key == Qt.Key_T: # Debug Toolbox
Toolbox.debug_register()
elif hasattr(super(), 'keyPressEvent'):
super().keyPressEvent(event)
else:
event.ignore()
