Comments on: Setting listbox mouse actions

By: Yair Altman

Yair Altman — Thu, 16 Dec 2010 23:00:48 +0000

@Dan - you could try placing figure(gcf) in your jListbox's MouseExitedCallback code. This will transfer the focus to the figure, and hopefully remove the focus from the listbox.

By: Dan

Dan — Thu, 16 Dec 2010 22:42:42 +0000

@Yair

Good evening.

I have put in practice your advice and by using the MouseWheelMovedCallback you describe above, it is easy to have the mouse wheel scrolling the list as desired, either by issuing the jListbox.requestFocus() you suggest or by using the Matlab builtin uicontrol(hListbox) function as each of them put the list in focus. Do you think there is an easy way to release the focus (other than clicking outside) and stop the mouse wheel scrolling the list, once the mouse is moved outside the listbox boundaries?

Thanks

Dan

By: Dan

Dan — Wed, 15 Dec 2010 21:24:45 +0000

Thank you for your advice.

I’ll get to it right away. I am not a “pro” programmer and I’ll try to figure out how to proceed from your trace.

Best regards

By: Yair Altman

Yair Altman — Wed, 15 Dec 2010 21:08:36 +0000

@Dan – thanks for the feedback.

Wheel scrolling can easily be processed by setting jListbox’s MouseWheelMovedCallback property to a Matlab callback function.

I’m not sure whether Java raises this event if the listbox is not focused. If so, then all you need to do is to trap MouseEnteredCallback and within its callback function call jListbox.requestFocus(). Subsequent mouse wheel events should be raised since the listbox will gain focus immediately upon mouse entry, similar to the X-Windows behavior.

By: Dan

Dan — Wed, 15 Dec 2010 20:27:32 +0000

Dear Yair, thank you very much for the time and effort you put in this project. There was really the need of it, as for many users that do not know Java, customizing Matlab GUIs is really an uphill task.

Related to your post, I would like to ask you how it would be possible to enable mouse wheel scrolling of a listbox, when the pointer hovers within the listbox limits, that is, without first select (focus) the lixtbox by mouse clicking or other means of selection.

The behavior I am trying to replicate is really standard nowadays with listboxes (particularly on the net), and I believe, and quite “natural” too!

Thank you very much in advance and for your help and congratulations for your site.

Regards

Dan

By: Teresa Hall

Teresa Hall — Fri, 17 Sep 2010 18:52:29 +0000

Thanks so much for this, it is exactly what I was looking for!

By: Yair Altman

Yair Altman — Thu, 16 Sep 2010 18:03:32 +0000

@Patrik – this indicates that for some reason your jScrollPane is an invalid handle when you run the relevant code. Most probably it is not visible onscreen for some reason.

By: Patrik

Patrik — Thu, 16 Sep 2010 10:36:54 +0000

Hello,

Tanks for a very nice tutorial, but when I run the line

   jListbox = jScrollPane.getViewport.getComponent(0);

I get the error:

No appropriate method, property, or field getViewport for class
handle.handle.

Error in ==> rightClickTest at 10
jListbox = jScrollPane.getViewport.getComponent(0);

I use Matlab version 7.9 (R2009b). Any idea what is wrong and is it easy to fix?

By: Yair Altman

Yair Altman — Tue, 15 Sep 2009 13:31:45 +0000

Thanks Aurélien – I fixed the post accordingly

By: Aurélien Queffurust

Aurélien Queffurust — Tue, 15 Sep 2009 12:42:10 +0000

oups I forgot to make the change in my previous comment : eventdata into jEventdata

The first 2 lines should be :

function mousePressedCallback(jListbox, jEventData, hListbox, jmenu)
   if jEventData.isMetaDown