Re: [ZooLib-dev] Slider drawing unimplemented?

[Andrew G. <ag...@em...>]

On Saturday, Feb 8, 2003, at 18:19 America/Mexico_City, Michael D. 
Crawford wrote:

> I've been trying to put a slider in my window but nothing shows up.
>
> Looking into the code, trying to draw it calls through to 
> RenderSlider.  This seems to only be defined for the platinum renderer 
> but the function body is empty.
>
> Is the slider not yet implemented or am I just missing something?
>
> If it's not there yet I can do a scroll bar for now.  I'll try to 
> implement a slider and contribute it.  I did one on a previous > project.
>
> I've been such a slacker the last couple of weeks it's taken me 
> several days to figure out where my slider is at.

I didn't have anything that needed a slider, so I never got around to 
implementing it. The intent was that it would have the same protocol as 
a scrollbar (they both implement ZUIRange), but without some actual 
test cases I was never able to define an appropriate mechanism and 
interface for defining and handling tickmarks and labels attached to 
those tickmarks -- one might need regularly spaced, exponentially 
spaced, randomly or data-driven spacing etc.

So that's why it's not there. The main task, for something fully 
general, is identifying the state needed to back a slider (count and 
location of ticks, labels at those ticks), and appropriate 
representations for that state. The dynamic behavior options (snapping 
to tickmarks or smoothly scaling for example) is the responsibility of 
the responder.

A+
-- 
Andrew Green                           mailto:ag...@em...
Electric Magic Co.           Vox/Fax: +1 (408) 907 2101