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How to extract information from a 'WindowButtonUpFcn'?

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Alon Rozen
Alon Rozen on 14 Nov 2016
Commented: Alon Rozen on 14 Nov 2016
Hi all,
I am using 'WindowButtonDownFcn' in a figure to do some work when I use the mouse. So my code includes a declaration of that function:
My_Figure.WindowButtonDownFcn = {@Do_When_Mouse_Button_pressed,Var_1,Var_2};
Of course, inside 'Do_When_Mouse_Button_pressed' I have a code saying what do do when the mouse button is up again. So is looks something like this:
function Do_When_Mouse_Button_pressed(src,Var_1,Var_2)
src.WindowButtonUpFcn = @Do_When_Mouse_Button_Released;
My problem is that I want to get some variables out from 'Do_When_Mouse_Button_Released'. I cannot figure out how to do that. The usual way of using:
[src.WindowButtonUpFcn,My_Ans] = @Do_When_Mouse_Button_Released;
Together with:
function My_Ans = Do_When_Mouse_Button_Released(src,Vars)
doesn't work.
Can anyone help?


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Accepted Answer

Walter Roberson
Walter Roberson on 14 Nov 2016
Callbacks are always provided with two arguments, source object, and event description. You only allowed for one automatic argument, source object.
It is not possible to return anything from a callback function, except if that callback is acting as a filter such as a position constraint callback.

  1 Comment

Alon Rozen
Alon Rozen on 14 Nov 2016
Thanks Walter,
I read carefully the attached link and understood. I solved it by sending down the main GUI handle, together with its hObject, and then wrote to it some results and saved it by using guidata function. I see that there is no simple workaround.
Thanks again!

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