[Newbies] Morphic event-handling confusion

max at nbtsc.org max at nbtsc.org
Sun Mar 18 06:27:00 UTC 2007

Thanks, I already got it working, which was in fact a very satisfying experience. My previous failure was using a "handlesMousedown" method, rather than "handlesMouseDown:evt" method. An important distinction.

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-----Original Message-----
From: Michael van der Gulik <mikevdg at gulik.co.nz>
Date: Sat, 17 Mar 2007 17:45:07 
To:"A friendly place to get answers to even the most basic questions aboutSqueak." <beginners at lists.squeakfoundation.org>
Subject: Re: [Newbies] Morphic event-handling confusion

Max OrHai wrote:

>>handlesMouseStillDown: evt
>>    ^ true
>>mouseStillDown: evt
>>    self position: evt hand position.
>These apparently don't do anything. But, that's OK, because I can, as
>Bert suggested, just send "evt hand #grabMorph: self".
>Except, oops, that's NOT OK, because now mouseUp: apparently never gets
>sent to my Morph.
>So, I still need help. Thank you both very much.
They "worked for me" - I was dragging a Morph around, and had readouts 
for the start and end positions of the dragging. Try making a completely 
fresh subclass of Morph with only the methods I suggested. I used Squeak 

If I was going to implement momentum, I'd take the current position on 
mouseUp: and the position received by the very latest mouseStillDown:, 
and work out which vector the puck should travel in from that. I suppose 
you'd also need the times of those two events as well to calculate the 
velocity vector.

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