App designer Key-press callback
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I have a uifigure with some buttons and an axes, which show a pointcloud in realtime. I added to the uifigure a Key-press callback, so that when the keyboard is pressed, some actions are performed. This works generally fine. My problem is that I need to click a pushbutton to start the pointcloud streaming. After pushing the button, the Key-press callback does not work anymore, maybe because the focus is on the button, and not on the figure. Then, if I click with the mouse on the axis, then the Key-press callback works again: is there a way to avoid or automatize this mouse click? I found the solution exploiting java (import java.awt.Robot; import java.awt.event.*; mouse = Robot;), i.e. programmatically move the mouse pointer to the axis and click it, but it is not the proper way to solve my issue and I would like something more robust. Any suggesiont?
4 Comments
Kelsey Bettridge
on 13 Dec 2021
Did you ever figure this one out? I'm having the same problem. I think you are correct about the focus, but I'm having trouble coding a workaround to get the focus back on the figure. Maddening!
Answers (1)
Adam Danz
on 15 Dec 2021
Edited: Adam Danz
on 16 Dec 2021
Attached is a simple demo app that contains a KeyPressFcn assigned to the uifigure and a button. The KeyPressFcn merely prints the key pressed to the command window.
At the end of the ButtonPushed callback function, the figure is activated using figure(app.UIFigure) so that it continues to respond to key strokes. This works in Matlab R2021a and later.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/834870/image.gif)
10 Comments
Jixiong Su
on 3 Nov 2023
Edited: Jixiong Su
on 3 Nov 2023
Thank you for your answer!
However, In 2023b, It would be better to use WindowsKeyPress rather than KeyPress.
Zel Hurewitz
on 17 Jul 2024 at 23:33
Edited: Zel Hurewitz
on 17 Jul 2024 at 23:33
In 2024a, zooming in a UIAxis seems to break the UIFigureWindowsKeyPress callback, maybe also for a similar reason about the figure being in focus.
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