> > >> I'm just saying the stepper itself should not have a value, it should send >> actions to a controller so it can manipulate a numeric value in a model >> object, or it should be able (using bindings) to increment/decrement a >> model's value. Using the UI as a model isn't what MVC is all about. > > > OK, so by that argument, no controls should have a value. Sliders should not > have a value. How then is that control going to draw itself? The position of > the slider is determined by its value relative to its min and max. If that > value can't be determined then the control will appear incorrectly, and > controls have no way to "ask" the data model for a value - it's up to the > relevant controller to push the value to the control. > > Since all controls work that way, why should NSStepper be an exception? > > In general I would agree that caching a value in more than one place is not > usually a good idea because of all the synchronisation issues that implies, > but for controls it's justified. In any case, correct use of controls, > whether through target/action or through bindings, takes care of the synch. > issue. If you are having trouble with that, you probably haven't got it set > up correctly. I use text field/stepper/slider combinations all over the place > and have never had to concern myself with synch. issues, even though all > three in a triple store the same value - get it right and really, it Just > Works. > > You might as well get used to it, that's how it is. > > --Graham > I would simply say that NSStepper only knows about its own state. It is quite inline with MVC. What the op is asking for is a more generic vertically oriented segmented button or a pair of NSButtons. That is super easy to implement. NSStepper is a precise type of form control for incrementing/decrementing a value. The value can be mapped to any sequential data. Dates and times are quite suited to it. Really anything that might have a reasonably narrow, precise granular increment. The only real question I see is whether the data incremented might also need a large scale ability to increment like a slider or nob or a combo box. _______________________________________________
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