Multiple Callback Functions

Hello MatLabers

I'm trying to have multiple callback functions executed on a uicontrol callback function.

Usually I go something like this:

obj = uicontrol(...,'style','popupmenu',...
                    'Callback',@(h,e)this.myfunc(h));

now I would like to not only have myfunc to be executed, but also myfunc2 and myfunc3.

I've tried the following (cell array of function handles):

obj = uicontrol(...,'style','popupmenu',...
                    'Callback',{@(h,e)this.myfunc(h), ...
                                @(h,e)this.myfunc2(h), ...
                                @(h,e)this.myfunc2(h)});

which does not work.

Any idea on how to achieve this? I explicitly do not want to have myotherfunc (which calls myfunc, myfunc2, myfunc3) to be the callback but rather be able to directly assign them to the uicontol (or whatever other callback function)

Thank you

[Jonas Reber]

note:

I'm doing OOP with handle classes and "this" refers to the object itself.

e.g.

classdef MyClass < handle

...

methods

...

function this = myfunc(this, hObject)

this.whatever = get(hObject,'property');

end

...

Answer 1

[Daniel Shub]

It is ugly ...

obj = uicontrol(...,'style','popupmenu',...
  'Callback', @(h,e)(cellfun(@(x)feval(x,h,e), ...
  {@(h,e)this.myfunc(h), ...
  @(h,e)this.myfunc2(h), ...
  @(h,e)this.myfunc2(h)}))

[Jonas Reber]

ugly but does exactly what I was looking for. Thanks

[Muhammad Tauqeer]

exactly looking for this beauty thank you!!

Answer 2

[Friedrich]

I think this is not possible without using some eval and feval command. I would suggest using only one callback function which calls the other functions:

obj = uicontrol(...,'style','popupmenu',...
                    'Callback',{@(h,e)this.dummyfunc(h)});

function dummyfunc(h)
  this.myfunc(h);
  this.myfunc2(h);
  this.myfunc3(h);
end

[Raymond]

hi..sorry but what is this @(h,e) means and stands for???

Answer 3

[Titus Edelhofer]

Hi,

perhaps you could explain why "myotherfunc" would be bad. Perhaps events could help you out (the callback emits an event and you have three listeners who react to this event...?)

Titus

Answer 4

[Jan]

I'd create a single callback, which calls the different functions. And if the list of callbacks must be created dynamically, a cell of function handles can be used as input for this wrapper:

fcnList = {this.myfunc, this.myfunc1, this.myfunc2};
obj = uicontrol(...,'style','popupmenu',...
  'Callback', {@wrapper, fcnList});

function wrapper(ObjH, EventData, fcnList)
for iFcn = 1:length(fcnList)
  feval(fcnList{iFcn}, ObjH, EventData);
end

Answer 5

[Thomas Merlo]

try putting all the function names in a single string:

hMenu = gcf;

set(hMenu,'MenuBar','none');

h = uimenu(hMenu,'Label','Multiple Callbacks', 'Callback', 'FuncA; FuncB; FuncC;');

----------

Obviously, you'll want to define these example furnctions first; for A, B, and C, something like:

function FuncA

fprintf('FuncA\n');

return

~ "works on my machine".