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Re: Why click to knob of NSSlider changes it's value?


On Apr 29, 2007, at 17:37, Matt Neuburg wrote:

On Sat, 28 Apr 2007 21:37:16 -0700, Andrey Tverdokhleb <email@hidden>
said: 
May be this is a stupid problem, but I just can't find a solution and
hope somebody here knows what to do.
I have a simple NSSlider, min: -40, max: 60, 11 ticks, continuos, no
sticking to ticks. Starting value is 0.
When I click knob of the slider for the first time it sends value
-0.81081032752990723 through bindings. When I click it again it
doesn't do this. If I change it's value to 0 programatically and
click the knob again it sends -0.81081032752990723 again. What I
don't understand why it's changing value on simple click considering
that sticking to ticks is disabled. I tried to change amount of ticks
- doesn't affect anything. Changing range changes that number, but
the range has to be (-40; 60).

If you change the physical length of the slider you'll get a different
number. Also you'll see the same phenomenon for any initial value (not just
0). Presumably this behavior has to do with the interface resolution: the
physical interface isn't capable of the degree of precision you're
expecting. If this is troublesome, it could be a reason for turning on
"sticking to ticks".

This would probably work, but 101 ticks is bit too much for that slider -
looks ugly, and I don't know how to prevent them from drawing.

On the other hand, since -0.81... is as near as the
user is going to be able to move the slider to zero anyway, why not just
accept this value? m.

I've no problems with precision or minimal step, but sliding has
to be relative to current slider's value and not to some semi-random number depending
on slider shape or size - changing slider type from small to mini or regular does
affect that shift also.
In any case value of the slider should not change from simple knob
clicking - no drag, no change. Overall NSSlider is just unpredictable and
I can't bind it directly to my variables.

Andrey

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References: 
 >Re: Why click to knob of NSSlider changes it's value? (From: Matt Neuburg <email@hidden>)



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