[ImageJ-devel] Design meeting notes

[Johannes Schindelin]

Hi,

On Tue, 12 Oct 2010, Curtis Rueden wrote:

> > That was my first idea. But how would the user interface tell the 
> > callback without String or java.lang.reflect.Field ugliness which 
> > input was modified by the user (and by that, what field should be 
> > changed accordingly), and how would the callback tell that it changed 
> > something, and what?
> 
> Each parameter has its own callback method, invoked when that particular 
> parameter changes. So as Lee said, which method is called indicates 
> which parameter was changed. (Perhaps it would be better to call the 
> attribute something like "onChange" instead.)
> 
> Does that clarify it? Or is there a problem I'm not seeing?

Just the infinite recursion thing (which is harder than meets the eye; 
you'd have to build a graph and detect circles).

It's also not clear how the callback would signal to the dialog (be that 
an ImageJ, or a KNIME or CellProfiler dialog) _what_ value was changed by 
the callback. (Just think of the user changing the width, and the callback 
wanting to modify the height _iff_ "keep aspect-ratio" is checked.)

Ciao,
Dscho