forked from PacktPublishing/AdvancedPythonProgramming
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathchain.py
More file actions
52 lines (42 loc) · 1.34 KB
/
chain.py
File metadata and controls
52 lines (42 loc) · 1.34 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
class Event:
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
class Widget:
def __init__(self, parent=None):
self.parent = parent
def handle(self, event):
handler = f'handle_{event}'
if hasattr(self, handler):
method = getattr(self, handler)
method(event)
elif self.parent is not None:
self.parent.handle(event)
elif hasattr(self, 'handle_default'):
self.handle_default(event)
class MainWindow(Widget):
def handle_close(self, event):
print(f'MainWindow: {event}')
def handle_default(self, event):
print(f'MainWindow Default: {event}')
class SendDialog(Widget):
def handle_paint(self, event):
print(f'SendDialog: {event}')
class MsgText(Widget):
def handle_down(self, event):
print(f'MsgText: {event}')
def main():
mw = MainWindow()
sd = SendDialog(mw)
msg = MsgText(sd)
for e in ('down', 'paint', 'unhandled', 'close'):
evt = Event(e)
print(f'Sending event -{evt}- to MainWindow')
mw.handle(evt)
print(f'Sending event -{evt}- to SendDialog')
sd.handle(evt)
print(f'Sending event -{evt}- to MsgText')
msg.handle(evt)
if __name__ == '__main__':
main()