On Wed, Nov 11, 2009 at 04:24, MartinWittemann <[email protected]>wrote:
>
> Hello Derrell,
>
> All model properties don't have the fallback to its value. What is clear
> is,
> that we need to supply a possibility to specify a different model than its
> value. But I don't know if we need a fallback to the value / label. All
> other widgets not having the model property use the value so you don't run
> into that problem.
>
> The only widgets with the model property which could have that fallback
> are:
>
> qx.ui.form.RadioButton
> qx.ui.menu.RadioButton
> qx.ui.form.CheckBox
> qx.ui.toolbar.RadioButton
>
> qx.ui.form.ListItem
> qx.ui.tree.AbstractTreeItem
>
> The first group could have its value as fallback. So you get 'true' or
> 'false' as model if no model is specified. But how do we know that no model
> is specified? Perhaps someone would like to have null as model? Imagine a
> set of radio boxes with the first one showing "no thanks" or anything like
> that.
> The same is true for the second group where it becomes the label instead of
> the value.
> What do you think? I'm not sure which situation is worse. Either you can
> not
> specify null as model or you have no fallback!
>
Martin, I don't think I yet have enough experience with the data binding to
give an educated response. My only comment right now, I guess, is that it
seems inconsistent. I like the concept of "default values" and in most
cases, there are some, but in this case there wasn't.
I agree it should be possible to specify null, but if that's not the common
case then I'd likely prefer for the user to do that explicitly on the rarer
occasions that it's necessary than for the user to always have to specify
values that could be defaulted automagically in the more typical case.
Derrell
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