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class MouseBehavior_OBS(object): #### REVIEW: might be no longer used, and/or renamed to ToolStateBehavior
# REVIEW: how are MouseBehavior and Tool related in a class hierarchy? guess: Tool's a subclass.
"""
Abstract class for simple mouse behaviors that are temporarily pushed
as handlers onto a pane (by client code after it creates us).
The pane is arg 1 of the constructor; the other args depend on the subclass.
To implement its "exit condition", a subclass instance should call self.done(),
which removes itself from pane's handlers, from within one or more of its
event handler methods. It can then return None or EVENT_HANDLED depending
on whether the exposed handlers should also handle the same event.
It can even dispatch some other event (or more than one), then return EVENT_HANDLED,
effectively replacing one event with another.
"""
### REVISE subs to call our init method
def __init__(self, pane):
"subclasses typically have more init args"
self.pane = pane
def done(self):
self.pane.remove_handlers(self)
pass
class Tool_OBS(object): ### REVISE super to MouseBehavior...
# or make this an option of mousebehavior? or "wrap" an MB to be a Tool? YES. THEN IT CAN PUSH multiple handlers when it starts.
"""
A Tool can act like a toggle button when in a pallette,
or like a set of event handlers when applied to a pane or widget.
A tool instance can be abstract, or be active within a specific pane,
self.pane.
"""
def __init__(self, pane): #k more args?
self.pane = pane
pass
#e check for CMD_RETVAL in the args... is this just "symbol replacement"? treating arg as "expr for a literal value"?
assert 0, "nim"
#### PROBLEM which CMD_RETVAL solves: state needs arg returned when command is run!!!
# simplest soln: always store cmd retval in a standard attribute...
# and have a name for that to use in the transition, CMD_RETVAL ### IMPLEM
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