Now I need to know how to do user defined events such

that when a digit overflows or underflows the next digit in line receives an

event and can increment or decrement itself. The event can go direct or

probably more sensible to send it to the parent which is my top level

display class not the alignment morph. Any hints appreciated.

 

Chris Muller wrote:

 

> I don't know whether I correctly understand what you are trying to do, but
one

> suggestion would be to maintain a pure domain (the single number) and just
let

> the UI display each digit..

 

Ok, but the reason I have a separate Morph for each digit is that it makes
the mouse interaction a lot easier to do as I mouse over each morph,
highlight it and let it capture the wheel/keystrokes. The parent will have
the single domain number and can load the digits initially and be informed
when one changes. What I am after is understanding the morphic event system
or perhaps just an event system. Not from the point of view of events
generated from the mouse, keyboard etc but in code when I decide there is
something another object might need to know about. At the moment I give the
object a block to execute which is really little more than a callback to
execute when a certain condition is met, so an empty block evaluates to nil
and nothing happens. This is the wrong way to do it and I want to make it a
pure event system. The sender of the event should not be concerned who the
receivers are or even if there are any receivers. 

 

It's easy enough to code up a notifier class such that senders just send
their named events to a notifier instance and event listeners register their
interest in named events and then receive those events. At least it's easy
in languages I know, I am still struggling a bit with the syntax and class
library. I simply thought that there must be a class that does that
somewhere.

 

Bob

 


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