How exactly the 'Enable' property works for GUI elements (ans is it bugged??)

Question

George Baltas 2018-12-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/436103-how-exactly-the-enable-property-works-for-gui-elements-ans-is-it-bugged

回答： George Baltas 2019-1-2

I experienced the following behavior. Created a push button (we talk about uifigure) set its 'Enable'='off' attached a 'ButtonPushedFcn' to it.

So far so good, then i proceed to play around with my UI the button is disabled and grayed out, I click on it and nothing happens (as it should)

Then I proceed to click it again multiple times in quick succession, nothing happens (again as it should) then suddenly my callback function is called!!!!!!!!

I can reproduce this behavior and it is really confuses me, please let me know if you have any advice on the matter.

For refference:

matlab.ui.control.Button('Parent',  myHandle , 'BackgroundColor', myBackground,...
                    'Position', myPosition ,'Enable','off', 'Text', myText,...                     
                    'HorizontalAlignment', 'center','FontName', 'arial','FontWeight', 'bold','FontSize', 11,...
                    'ButtonPushedFcn', @(src,event) myCallbackFcn(app,src,event,index));
function myCallbackFcn(app,src,event,index)
%%%%
end

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George Baltas 2018-12-18

在 MATLAB Online 中打开

classdef test
    properties
        myFigure
    end
        
    
    methods
        function app=test
            app.myFigure=uifigure;
            matlab.ui.control.Button('Parent',app.myFigure,'Enable','off','ButtonPushedFcn', @(src,event) myCallbackFcn(app,src,event));
        end
    end
end
function myCallbackFcn(app,src,event)
disp('hello world')
end

George Baltas 2018-12-18

I am using 2018a

Run the above as is, I click at the edge of the grayed out Button and I can call the callback function. I click at the body of the button and nothing happens. Is this how it is supposed to be or I am missing something. Thank you in advance. matlab problem.PNG