Re: [jazzplusplus-devel] Selection

[Joakim V. <jo...@ve...>]

The in the gui the selection code works by drawing a rectangle round the 
events you want.

The filter is a gui state variable that says what type of events you 
want to select.

A command can basically choose to ignore the filter, thats why its a 
separate entity from the selection.

Heres what the filter dialog used to look like:

http://www.jazzware.com/docs/html/jazz42.html#midifilter

So the Filter is very clearly not a gui object(except you set the Filter 
in a gui of course).

The drawing code is mostly pretty standard model-view-controller stuff,
very similar to what you would do in microsofts MFC, except the
jazz code is pretty confused over how this pattern is supposed to work,
which I've spent a lot of time trying to fix in various parts of the code.

It used to be that drawing occured in the event listeners, which really 
is a no-no,
and led to all sorts of gui bugs in the pre-port code base. Im shure 
theres plenty of these problems
around still.   But I digress... i hope I answered your question!

/Joakim

Dave Fancella wrote:

>All,
>
>Ok, now I'm pretty thoroughly confused, again.  :(  I'm working on making 
>selection and the clipboard exist inside jppProject instead of inside the 
>GUI.  Here's what I've got:
>
>With an empty project, I can select events.  There aren't any to select.  When 
>I load a midi file, selection doesn't work anymore at all.  (I may have 
>broken that, sorry!)
>
>I'm thoroughly confused for several reasons.  First, I'm not very good at 
>graphics/GUI stuff when I have to build my own, so I use stock widgets pretty 
>much all the time.  :)  So I don't understand the drawing code all that well, 
>well, not at all, really.  Second, the selection code is extremely 
>convoluted.  I've narrowed it down, I think.
>
>It looks like when you're done selecting, jazz uses a Filter object to store 
>the selection.  I feel like Marty McFly, but what the hell's a Filter?  ;)  
>So when you do have a selection with real events in it, do the events get 
>copied to the filter object, or does the filter object just store locations 
>of those events?
>
>Dave
>
>  
>