Certain widgets will allow me to do:
self.widget.clicked.connect(on_click)
but doing:
self.widget.keyPressEvent.connect(on_key)
will fail saying that the object has no attribute 'connect'.
I know that sub-classing the widget and re-implementing the keyPressEvent method will allow me to respond to the event. But how can I .connect() to the keyboard event thereafter, or otherwise said, from a user context?
Create a custom signal, and emit it from your reimplemented event handler:
class MyWidget(QtGui.QWidget):
keyPressed = QtCore.pyqtSignal(int)
def keyPressEvent(self, event):
super(MyWidget, self).keyPressEvent(event)
self.keyPressed.emit(event.key())
...
def on_key(key):
# test for a specific key
if key == QtCore.Qt.Key_Return:
print('return key pressed')
else:
print('key pressed: %i' % key)
self.widget.keyPressed.connect(on_key)
(NB: calling the base-class implementation is required in order to keep the existing handling of events).