OpenEuphoria

Re: My Bits are Flipping (or, "Why Can't I Be Negative?")

• Posted by Travis Beaty <eucoder at travisbeaty.us> Aug 28, 2004
• 451 views

Hello Mr. Serpa ...

Well, actually, that's the problem.  The value will be positive if the mouse 
is *in* the widget, but will become negative if it crosses past the left or 
top edge.  This would happen, for instance, if the user has their left mouse 
button pressed down and slides the mouse to the left.  Therefore, we have a 
situation where it's *probably* positive, but there is fairly decent chance 
that it won't be.

The only other way I can think of doing it is giving the mouse's position in 
turns of the global coordinate system, and allowing the user to convert to 
the widget's coordinate system as necessary.  The process of converting would 
include peeking values, so that would fix the situation.  But giving the 
mouse coordinates in the global coordinate system when receiving the signal 
from a widget would be a bit of a hack, and would not be expected behavior.  
Or, I could throttle it from the C++ end, and make sure a negative value is 
never passed:  but if someone is expecting a negative value, and it dead ends 
at zero, then again, unexpected behavior.

Mr. Craig, any possibility of putting the ability to detect signed values from 
external libraries on the last-minute 2.5 wishlist?  Or the first minute 2.6 
one?

Thanks everyone for your help!!

Travis.



On Friday 27 August 2004 07:04 pm, Andy Serpa wrote:
> It is not the difference between negative & positive per se -- it is the
> difference between signed & unsigned values.  The library either returns
> signed or unsigned values.  If it returns signed values, then you convert
> them.  There is no danger to it, and no guessing, unless you don't know
> what the library is supposed to be giving you.



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