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Re: How to distinguish between user selection and programatic selection with ListSelectionListener

Scott Palmer <email@hidden> wrote:

>I don't wan the GUI components to fire events that
>cause me to update my project document or otherwise mark it as
>'modified' by the user.
>
>I always felt that there should be a method to set the state without
>trigger listeners.. but it seems that would require two kinds of
>listeners... if views listen to the model to show the proper state then
>initializing the model from some document should fire those events to
>cause the GUI to show the correct state. However if my listeners are
>tracking changes to the model to change my document based on user
>actions, I don't want these to be called when initializing the model
>from the project document.

The model itself should manage whether the document is modified or not.
Your views, all of them, should set or query that state from the model.

If you have a document model, then you should be able to represent a new
document with that model. Or a modified one, or whatever else the
conceptual model needs.

Maybe I'm missing something, but I still can't see why, with a proper
model/view relationship, you have to make the distinction between
user-initiated and program-initiated events. I *CAN* understand why this
would be convenient if one doesn't have the proper model/view relationship.
But adding a feature to correct avoidable design problems strikes me as a
fundamentally bad idea.

Since this discussion is now entirely theoretical, maybe a good example
where the feature's necessity is obvious would be worth seeing. I admit I
can't think of one, so may be someone else can.

-- GG
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