Programmatically event in App Designer, is it possible?

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Eric Delgado 2022-9-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1808640-programmatically-event-in-app-designer-is-it-possible

评论： Adam Danz 2022-9-21

I am trying to create an event programmatically in App Designer, like a "PushedButton" or a "ValueChanged". Is it possible? I know that I can call the callback function directly, without passing the "event" argument, but I wish I could use notify function.

notify(app.myButton, 'ButtonPushed')
% Error using matlab.ui.control.Button/notify
% Cannot notify listeners of event 'ButtonPushed' in class 'matlab.ui.control.Button'.

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Adam Danz 2022-9-21

Why not just call the ButtonPushed callback function directly?

Eric Delgado 2022-9-21

编辑：Eric Delgado 2022-9-21

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Hey @Adam Danz, in a big project I prefer to create just one callback for several buttons (of the same family), using event.Source. If a create a "shortcut" for one of those buttons (an image in a mosaic, for example), I wish I could create an event programmatically.

function ButtonsPushedCallback(app, event)
    switch event.Source
        case app.Button1; % Execution code related to Button1
        case app.Button2; % Execution code related to Button2
        case app.Button3; % Execution code related to Button3
        case app.Button4; % Execution code related to Button4
    end
end
function Button1ShortcutCallback(app, event)
    notify(app.Button1, 'ButtonPushed')
end

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Answer 1

Adam Danz 2022-9-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1808640-programmatically-event-in-app-designer-is-it-possible#answer_1058110

编辑：Adam Danz 2022-9-21

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For push buttons, the event is a ButtonPushedData object with properties Source (button handle) and EventName ('ButtonPushed'). Your switch/case matches the Source with known button handles.

From what I understand, you want to directly call the ButtonsPushedCallback function and provide a known button handle so you can run some code that belongs to one of the cases. If that's correct, when you call ButtonsPushedCallback, if you have access to the app object, you can provide the button handle within a structure with a field named Source.

Example:

S = struct(); 
S.Source = app.Button1; 
ButtonsPushedCallback(app, S)

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Eric Delgado 2022-9-21

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Wow @Adam Danz, thank you! That's one of the kinds of answers that you think "It's obvious!". A simple and clever solution. It works! And now I just deleted more than 10 callbacks. :)

It's important to put true in the Value property of the button, so it could behavior like a "button clicked".

function ButtonsPushedCallback(app, event)
    switch event.Source
        case app.Button1; % Execution code related to Button1
        case app.Button2; % Execution code related to Button2
        case app.Button3; % Execution code related to Button3
        case app.Button4; % Execution code related to Button4
    end
end
function Button1ShortcutCallback(app, event)
    % notify(app.Button1, 'ButtonPushed') % It doesn't work!
    app.Button1.Value = 1;
    ButtonsPushedCallback(app, struct('Source', app.Button1))
end