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Set 'KeyPressFcn' to a method in the class

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Alon Osovsky
Alon Osovsky 2020-5-24
回答： Monika Phadnis 2020-5-27
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!

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回答（1 个）

Monika Phadnis
Monika Phadnis 2020-5-27
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.

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