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From: Jackson on 10 Jun 2010 13:15
Hi,
i'm new here. I have the following problem, hopefully somebody can help me.

I made a "minimal code". The Problem is that every time the event is thrown the slider_call callback function is executed, but the propertie testvalue won't ne change. When the callback ist executed for a second time der propertie values are set back again to the ones with which the object was constructed.


classdef testslide
properties
slider;
testvalue;
end
methods
function this=testslide()
this.slider=uicontrol('Style','Slider');
this.testvalue=0;
addlistener(this.slider,'Action',@(src,evnt)slider_call(this,src,evnt));
end

function slider_call(this,src,evnt)
disp(['before' num2str(this.testvalue)]); %always 0
this.testvalue=this.testvalue+1;
disp(['afer' num2str(this.testvalue)]); %always 1
end
end
end
From: Rich Ellis on 10 Jun 2010 17:45

Search for, "Example - Class Method as a Slider Callback" in the MATLAB
documentation.

"Jackson " <big_jim_sladelol(a)gmx.de> wrote in message
news:hur6j9$7lv$1(a)fred.mathworks.com...
> Hi,
> i'm new here. I have the following problem, hopefully somebody can help
> me.
>
> I made a "minimal code". The Problem is that every time the event is
> thrown the slider_call callback function is executed, but the propertie
> testvalue won't ne change. When the callback ist executed for a second
> time der propertie values are set back again to the ones with which the
> object was constructed.
>
>
> classdef testslide
> properties
> slider;
> testvalue;
> end
> methods
> function this=testslide()
> this.slider=uicontrol('Style','Slider');
> this.testvalue=0;
>
> addlistener(this.slider,'Action',@(src,evnt)slider_call(this,src,evnt));
> end
> function slider_call(this,src,evnt)
> disp(['before' num2str(this.testvalue)]); %always 0
> this.testvalue=this.testvalue+1;
> disp(['afer' num2str(this.testvalue)]); %always 1
> end
> end
> end


From: Jackson on 11 Jun 2010 12:37
"Rich Ellis" <rich(a)mathworks.com> wrote in message <hurme5$1f6$1(a)fred.mathworks.com>...
>
> Search for, "Example - Class Method as a Slider Callback" in the MATLAB
> documentation.
>
> "Jackson " <big_jim_sladelol(a)gmx.de> wrote in message
> news:hur6j9$7lv$1(a)fred.mathworks.com...
> > Hi,
> > i'm new here. I have the following problem, hopefully somebody can help
> > me.
> >
> > I made a "minimal code". The Problem is that every time the event is
> > thrown the slider_call callback function is executed, but the propertie
> > testvalue won't ne change. When the callback ist executed for a second
> > time der propertie values are set back again to the ones with which the
> > object was constructed.
> >
> >
> > classdef testslide
> > properties
> > slider;
> > testvalue;
> > end
> > methods
> > function this=testslide()
> > this.slider=uicontrol('Style','Slider');
> > this.testvalue=0;
> >
> > addlistener(this.slider,'Action',@(src,evnt)slider_call(this,src,evnt));
> > end
> > function slider_call(this,src,evnt)
> > disp(['before' num2str(this.testvalue)]); %always 0
> > this.testvalue=this.testvalue+1;
> > disp(['afer' num2str(this.testvalue)]); %always 1
> > end
> > end
> > end
>


Thanx a lot, well the problem was that it had to be a handle class.
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