How to extract information from a 'WindowButtonUpFcn'?
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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?
Thanks,
Alon
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采纳的回答
Walter Roberson
2016-11-14
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.
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