MATLAB Answers

Matt Fig

Where is a list of eventtypes for listeners?

Asked by Matt Fig
on 11 Dec 2012
Latest activity Answered by Jim Hokanson
on 11 Feb 2015

Usually I think MATLAB has excellent documentation, but there are occasions when I have to pull my hair out looking for something. So when referring to this example solution posted by TMW, it seems we can add an eventlistener to a uicontrol with an eventtype of 'ActionEvent'. But when I use this example I get the following warning message in r2011b:

Warning: The specified event will be removed in a future release.
Please use the following event instead: ContinuousValueChange

So the obvious question is:

What are all of the choices when setting eventtypes for listeners?

I have searched everywhere I can think of for a list of such events but found nothing. Is this yet another instance of non-documentation in MATLAB or have I just not been able to find it?

Does anyone know of such a list in the doc? I want to find something like this list of axes properties but for events or listeners. On that list would be 'ActionEvent' and 'ContinuousValueChange' at least.


I cannot even find documentation on handle.listener. I wonder if this is a result of undocumented functionality associated with hg2.

Jan Simon
on 12 Dec 2012

The addlistener command works for many years now, so it is not connected to HG2. The M-file contains some documentation, but you do not find it in the docs, as far as I remember.

Matt, did you find any list or documentation for this?


No products are associated with this question.

2 Answers

Answer by Jim Hokanson
on 11 Feb 2015

For hg1, events can be found tin the schema.class object

h = uicontrol('style','slider')
class_info = classhandle(handle(h))
events = class_info.Events;
   event_names_local = cell(1,length(events));
   for iEvent = 1:length(events)
       event_names_local{iEvent} = events(iEvent).Name;

For hg2, things are much easier, just reference the metaclass

class_info = metaclass(graphics_handle);
event_names_local = {class_info.EventList.Name};

'ActionEvent' is an event in the schema.class (UDD)

'ContinuousValueChange' is an event in hg2

I have no idea where to find a list of newer events (i.e. ContinuousValueChange when using hg1)

To be a bit more thorough, one could also examine the accompanying Java object using findjobj (FEX). Then you would need to search for properties with a 'Callback' with an accompanying 'CallbackData'

Note, one would also want to examine the properties for ones that are observable. This should be fairly straightforward using a similar approach as was used for events.



Answer by Malcolm Lidierth
on 26 May 2013


As the uicontrols use Java under the hood, see the available Java listeners at

The link above is now broken but I'll guess the UI was a slider or something of that sort which calls a stateChange rather than event listener.

MATLAB collapse these into their 'Callback'. I have always preferred to stick with documented components - so I use Java for GUIs in MATLAB not MATLAB uicontrols. TMW may not document them, but Sun/Oracle do of course.



There are two links, the first does not work: at least insofar that it now only brings up a page that says "Oops". So its broken according to the formal definition of the term given here:


I only saw one link that you listed - the one at, and clicking on it brings up a page that says

"Listener API Table

In the table that follows, the first column gives...."


Oops. I meant the OPs first link. Probably best to break this LOop.

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