yes – assuming you created the spinner using the javacomponent function, you can modify the Position and Units properties of the component’s container handle, which is the second output argument returned by javacomponent. See http://undocumentedmatlab.com/articles/javacomponent for details.

Is it possible to modify the spinner’s position (x, y, w, h) after it has been created? I’m trying to do it during a SizeChangedFcn callback.

Thanks.

@Asimov – Java events often fire twice: first when the event processing starts, and then when the even processing ends. You can process only one of them by adding code in your callback function to prevent re-entrancy. For example:

% Variant1
function myCallbackFcn1(hObject,eventData,varargin)
   persistent inCallback
   if ~isempty(inCallback),  return;  end
   inCallback = true;
   try
       % do something useful here
   catch
       % error trapping here
   end
   pause(0.001); drawnow;  % give all other GUI events a chance to bail out above
   inCallback = [];
end  % myCallbackFcn1

Additional information: http://undocumentedmatlab.com/blog/controlling-callback-re-entrancy

If you found my book useful, then please post a favorable review of it on Amazon – thanks in advance!

I tried to add a StateChangedCallback to the JSpinner, and if the value is modified, it will display the current value on the command line.

import javax.swing.*
import java.awt.*
f = figure;

sm = SpinnerNumberModel(1.1, 0, 9, 0.3); % default, min, max, step
js = JSpinner(sm);
[jspinner, mspinner] = javacomponent(js);
set(jspinner,'StateChangedCallback', 'disp(jspinner.getValue)');

However, I find a strange phenomenon, the callback is sometimes invoked twice.

The codes above will output someting like this:

    1.4000 (click up)
    1.1000 (click down)
    1.1000
    0.8000 (click down)
    0.8000
    0.5000 (click down)

Notice that although I only click once, the disp sometimes output two same results.

So I try to check whether the value is changed at the first time. However, something stranger happens.

I replace the StateChangedCallback by the line below.

set(jspinner,'StateChangedCallback', 'disp([jspinner.getPreviousValue jspinner.getValue])');

Which outputs:

    1.4000    1.7000 (click up)
    1.1000    1.4000 (click down)
    1.4000    1.7000 (click up)
    1.4000    1.7000

Notice that even the value is changed at line 3, it still disp twice.

And the jspinner.getPreviousValue seems to not remember the result of the first time.

So I use a temperate value to check whether the value is the same with the previous. (Why I use a tmp value? Because the jspinner.getPreviousValue failed in the case above.)

tmp = 0;
set(jspinner,'StateChangedCallback', ...
    'if tmp~=jspinner.getValue;disp(tmp);tmp = jspinner.getValue; end');

This time, the output works fine, and it never outputs two same lines.

I guess the problem may be something related to the thread of java/matlab events, but I do not hava enough knowledge about it. The problem could be solved by adding a temp value and add an if-end sentence, but it would be better to know the reason.

Could you please help me find the reason of this problem?

By the way, your MATLAB-Java book and many blogs has helped me a lot!

Thank you so much!

@yair
I have found the reason. By default the decimal format is local dependent!!
In France it is , and not .
Ok I’ll look at your demo.
However a last point as in your demo, if the user enters a value outside min or max (for example 2030 as year) the spinner is out of use.
Is there a special callback property to use in order to check this case.

Alain

@Alain – see my SpinnerDemo (or read JSpinner‘s documentation) to see how to modify the text formatting.

@yair
Thanks a lot. It works fine. I had a similar problem with Spinner BackgroundColor and ForegroudColor. Now using for exemple

val = num2cell([0 0.8 0.8]);
jhSpinner.getEditor.getTextField.setBackground(java.awt.Color(val{:}));

gives the expected result.

Why a non standard “Text: ‘125,5’” property although the Value property is
“Value: 1.2550e+02” ?

jhSpinner.getEditor.getTextField.getFormatter
ans =
javax.swing.JSpinner$NumberEditorFormatter@a798948

Is there a way to modify something here?
Cheers
Alain

@Alain – apparently the JSpinner component creates its internal text-field using the parent control’s Font property value when it is first rendered, and then ignores changes to that parent property value. Instead, you can modify the text-field’s Font property (and its other property values) directly:

jhSpinner.getEditor.getTextField.setFont(java.awt.Font('Serif', 0, 20));

consider the following spinner

Model = javax.swing.SpinnerNumberModel(125,15,225,.5);
jSpinner = javax.swing.JSpinner(Model);
[jhSpinner,hghandle] = javacomponent(jSpinner)
jhSpinner.Font=java.awt.Font('Serif', 3, 50);

At this step all is right!

Now if I want to come back to non bold non italic

jhSpinner.Font=java.awt.Font('Serif', 0, 50);

is without any effect!!?? Any idea?

Another curious point values appear as 140 140,5 141 … and not 140.5 ??

Thanks
Alain

Oh, yes. Thank you for the simple solution, Yair!