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Spirantho
Reaction Label object text changing?
Posted on: 2012/5/13 8:09    #1
Quite a regular
Quite a regular


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Hi everybody,

I'm writing a Reaction app which needs a slider with 12 values, 0-10 and "AUTO". I'm trying to make a label next to the slider using a Label object, and this works. However, it never updates, even when I call SetAttr or SetGadgetAttr or whatever. I'm using an IDCMP hook for notification.
What should I be doing to get this label working?

Thanks for any help!
--
Ian Gledhill
ian.gledhill@btinternit.com (except it should be internEt of course...!)
Check out my company's shop: http://www.mutant-caterpillar.co.uk/shop/ - specialising in Sinclair Spectrums but will be adding Amigas!
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trixie
Re: Reaction Label object text changing?
Posted on: 2012/5/13 9:33    #2
Amigans Defender
Amigans Defender


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You have taken the wrong road, traveller Don't use a label to display slider values, use the SLIDER_LevelFormat tag instead. But because sliders only produce numeric values, you will need to setup a slider level hook and provide a hook function to convert the numbers.

First create the hook function that does the conversion:

char *slider_hook_function(struct Hook *hook, Object *gadget, struct TagItem *tags)
{
 static char string[8];
 int32 level = IUtility->GetTagData(SLIDER_Level, 0, tags);

 if ( level == 11 ) sprintf(string, "AUTO");
 else sprintf(string, "%d", (int) level);

 return string;
}


Then setup the hook:

sliderHook = (struct Hook *)IExec->AllocSysObjectTags(ASOT_HOOK,
                    ASOHOOK_Entry, slider_hook_function,
                    ASOHOOK_Subentry, NULL,
                    ASOHOOK_Data, NULL, TAG_END);


In your GUI creation code, the slider gadget definition must include the following tags:

GA_RelVerify, TRUE,
SLIDER_Min, 0,
SLIDER_Max, 11,
SLIDER_LevelFormat, "%s",
SLIDER_LevelHook, sliderHook,
SLIDER_LevelMaxLen, 6,


The slider will display the labels automatically, the value conversion (11 = AUTO) is done by your hook function.

Of course, when you're done with your program you must free the hook because hooks are system resources:

if (sliderHook) IExec->FreeSysObject(ASOT_HOOK, sliderHook);


The Rear Window blog

AmigaOne X5000 @ 2GHz / 4GB RAM / Radeon RX 560 / ESI Juli@ / AmigaOS 4.1 Final Edition
SAM440ep-flex @ 667MHz / 1GB RAM / Radeon 9250 / AmigaOS 4.1 Final Edition
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Spirantho
Re: Reaction Label object text changing?
Posted on: 2012/5/14 12:44    #3
Quite a regular
Quite a regular


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Excellent! Thanks for that - I did wonder if I was barking up the wrong tree but there's scant little documentation to work with.

This is exactly the sort of entry that should go in the new AmigaOS developers wiki! :)
--
Ian Gledhill
ian.gledhill@btinternit.com (except it should be internEt of course...!)
Check out my company's shop: http://www.mutant-caterpillar.co.uk/shop/ - specialising in Sinclair Spectrums but will be adding Amigas!
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