App designer Key-press callback

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Paolo Neri 2021-3-10

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https://ww2.mathworks.cn/matlabcentral/answers/768467-app-designer-key-press-callback

编辑： Zel Hurewitz 2024-7-17，23:33

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?

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Kelsey Bettridge 2021-12-13

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!

Paolo Neri 2021-12-14

No, I could not solve the issue and I did not get any suggestion.. if you do, please post!

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回答（1 个）

Adam Danz 2021-12-15

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编辑：Adam Danz 2021-12-16

app1.mlapp

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.