callback patterns and idioms in Python
callback patterns and idioms in Python
callback patterns and idioms in Python
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Events <strong>in</strong> GUI frameworks<br />
the most classic of event-driven fields<br />
e.g, consider Tk<strong>in</strong>ter:<br />
elementary <strong>callback</strong>s e.g. for buttons:<br />
b=Button(parent, text='boo!', comm<strong>and</strong>=...)<br />
flexible, advanced <strong>callback</strong>s <strong>and</strong> events:<br />
wgt.b<strong>in</strong>d(event, h<strong>and</strong>ler)<br />
event: str<strong>in</strong>g describ<strong>in</strong>g the event (e.g.<br />
'', '', '', ...)<br />
h<strong>and</strong>ler: callable tak<strong>in</strong>g Event argument<br />
(w. attributes .widget, .x, .y, .type, ...)<br />
can also b<strong>in</strong>d by class, all, root w<strong>in</strong>dow...<br />
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