[PythonCAD] state table?
Russ Nelson
nelson at crynwr.com
Thu Jun 8 22:23:46 CEST 2006
I've been looking at the way various components get specified, and
there seems to be a fair amount of overlap. And yet the callback
system of gtk doesn't lend itself well to subroutines. I wonder if it
might be a great simplification to have a state table?
Instead of changing the callback handlers, they would stay the same,
and do different things depending on the current state. So, for
example, an angled construction line takes:
State Pointer Entry Action Next State
21 a click a pair of points Save Point 22
22 rubberband an angle Save Angle 23
23 Add ACLine at Point, Angle
This needs more fleshing out with details, but I think you can see
that it would eliminate a lot of code, and allow new commands to be
added without needing to reinvent rubber-banding every time. Should I
continue the design, or is this a bad idea?
I don't know how this design change would affect the Cocoa interface,
if at all.
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