App Designer get element in focus

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ROL
ROL 2019-1-25
回答： Suraj Kumar 2024-7-30
Hi there,
I switched from GUIDE to the App Designer some time ago, and find that a lot of important functionalities are now missing. One particular feature is the possibility to get a handle to the current GUI element in focus. In my particular example, I have 2 ListBox elements in my application and I want to add a shortcut to them for modification. The KeyPress function is only possible on the uifigure level, so I need a way to distinguish between the two ListBox elements.
Is this possible in some way or does this feature not exist at the moment.
Thanks, Rasmus

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回答（1 个）

Suraj Kumar
Suraj Kumar 2024-7-30
Hi,
I understand that you are facing difficulty in getting the handle of the current GUI element which is in focus. As a workaround you can track the focus manually by setting up callbacks for each interactive component and storing the handle of the currently focused component in a property.
Consider adding a private property to store focussed component as shown below:
properties (Access = private)
FocusedComponent
end
Then implement the “onKeyPress” callback to handle key press events based on which “ListBox” is currently focussed.
You can refer to the code below for better understanding:
function onKeyPress(app, event)
if isempty(app.FocusedComponent)
return;
end
switch app.FocusedComponent
case app.ListBox1
% Handle key press for ListBox1
disp('Key pressed in ListBox1');
case app.ListBox2
% Handle key press for ListBox2
disp('Key pressed in ListBox2');
end
end
Please refer to the following documentation link on “callbacks” in App Designer :
Hope this helps!

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