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 Kommentare
Kelsey Bettridge
am 13 Dez. 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!
Antworten (1)
Adam Danz
am 15 Dez. 2021
Bearbeitet: Adam Danz
am 16 Dez. 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 Kommentare
Jixiong Su
am 3 Nov. 2023
Bearbeitet: Jixiong Su
am 3 Nov. 2023
Thank you for your answer!
However, In 2023b, It would be better to use WindowsKeyPress rather than KeyPress.
Zel Hurewitz
am 17 Jul. 2024
Bearbeitet: Zel Hurewitz
am 17 Jul. 2024
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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