Notify event in a class

Question

Mateus Banroc 2019-12-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/498214-notify-event-in-a-class

评论： Mateus Banroc 2019-12-27

采纳的回答： Max Murphy

在 MATLAB Online 中打开

Hi guys,

I'm having some problems with event in classes. I have a class class like this:

classdef ClassA < handle
    properties
        prop
    end
    events
        EventA
    end
    methods
        function o = ClassA
            addlistener(o,'EventA',@o.callbackfun);
            
            o.prop = ClassB;
        end
        function callbackfun(o,~,~)
            % do something
        end
    end
end

and the ClassB like:

classdef ClassB < handle
    properties
        button
    end
    methods
        function o = ClassB
            fig = figure;
            o.button = uicontrol(fig,'Style','pushbutton','Callback',@(~,~,~) notify(ClassA,'EventA'));
        end
    end
end

And then, when I click the button, it opens a new figure. Like it was calling ClassA again. What I am doing wrong?

Thanks,

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Answer 1

Max Murphy 2019-12-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/498214-notify-event-in-a-class#answer_407911

在 MATLAB Online 中打开

You are very close to having it working! In your Notify callback, you make a call to the constructor ClassA rather than a specifieid object of type ClassA. So you would give the argument to the ClassB constructor to pass an object of type ClassA and then reference that object instead of the class constructor:

classdef ClassB < handle
    properties
        button
    end
    methods
        function o = ClassB(classAObj)
            fig = figure;
            o.button = uicontrol(fig,'Style','pushbutton','Callback',@(~,~,~) notify(classAObj,'EventA'));
        end
    end
end