Tri-state checkboxes

[Brent Anderson]

Another option would be to use a Custom Property set to keep track of  
which image to display. On openstack, determine the system type and  
set the custom prop set appropriately.

Thanks,
Brent Anderson
Christa McAuliffe Space Education Center


On Feb 23, 2007, at 11:37 AM, Ken Ray wrote:

> On Fri, 23 Feb 2007 09:22:33 -0800, Mark Powell wrote:
>
>> Thanks to all for your suggestions, but they do not precisely fit  
>> what I
>> need.
>>
>> The image solutions assume one look-and-feel...if the standalone  
>> were to
>> be run on Vista, for example, the image would have the wrong motif  
>> when
>> compared to the neighboring conventional checkboxes.  And Stephen's
>> solution uses disabled as the third state, which is not what I  
>> need.   I
>> need an enabled third state.
>>
>> I am guessing this is not possible, but any other ideas are greatly
>> appreciated.
>
> Well, the closest you can get is to have a single image that shows the
> equivocal state that is put on top of a real checkbox, and is hidden.
> When the user clicks on the checkbox, you check the current state of
> the hilite and if it is true (checked), you show the equivocal  
> image on
> top and allow the mouseup to continue (which will change the checkbox
> to cleared (unchecked), but beneath the equivocal image. Then when the
> user clicks on the image, you have script that simply hides the image.
>
> Then to find out the "state" of the checkbox, you'd just check the
> visible of the image - if it's showing, you're in an equivocal state;
> if not, you take the hilite of the checkbox.
>
> HTH,
>
> Ken Ray
> Sons of Thunder Software, Inc.
> Email: kray at sonsothunder.com
> Web Site: http://www.sonsothunder.com/
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