On Thursday 30 October 2008, Gajera Tejas wrote:
> hi,
>
> I have problem with slider which connected with DataTarget. it's value can
> not update when we make a change in slider.
>
> basically if we have like... new FXSlider(parent, target, ID_SOMETHING);
> then it will call the function which is assign with ID_SOMETHING;
>
> but what happend with...new FXSlider(parent, &DataTarget,
> FXDataTarget::ID_VALUE);
> this slider connected with data target. how to handle events when we click
> on slider or move slider using mouse?
The FXDataTarget itself also has a target/message ID; it generates SEL_COMMAND
or SEL_CHANGED messages with this ID when it receives messages from the FXSlider.
The target of the FXDataTarget will however NOT receive SEL_UPDATE messages
from the FXDataTarget; this is because these can now be satisfied by the FXDataTarget
itself through its associated variable.
My own philosophy is to use FXDataTarget when a simple variable needs to be changed,
and to catch SEL_COMMAND and SEL_UPDATE messages directly from the widget if the
interaction between the control and the program is more immediate [for example, besides
updating the control's value you might have to enable/disable it based on program state].
Hope this helps,
- Jeroen
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