Set 'KeyPressFcn' to a method in the class

Hi there!

I have a method in a class that sets the "key press function" of a figure, and I just can't figure a way to set that function to be a method from the same class.

In my program, I have written something like this:

classdef main
    
    methods
        
        function setFunction(obj)
            % The function that sets the callback function.
            set(gcf, 'KeyPressFcn', @obj.functionToSet)  % The part that i'm trying to figure out!
        end
        
        function functionToSet(obj, event)
            % This function is the funtion that I want to be called when a key is pressed.
            disp(event.Key)  % prints the pressed key
        end
        
    end
    
end

I can guess that the solution is simple. Thanks in advance!

Answer 1

[Monika Phadnis]

The 'KeyPressFcn' returns 'KeyData' object specifying information about the key pressed. You can define this as the third argument in the 'functionToSet' method.

This code worked for me:

function functionToSet(obj,event,keyData)
        disp(keyData.Key)  % prints the pressed key
end

You can also check the documentation for various properties KeyData objects holds:

https://in.mathworks.com/help/matlab/ref/matlab.ui.figure-properties.html#buiwuyk-1-KeyPressFcn

Hope this helps.