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Jay Vaidya 2021-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/849010-auto-refresh-in-app-designer

评论： Adam Danz 2021-6-8

I have a couple of controls in my GUI but it can also happen that I control my system manually (sometimes). So the below image shows the lamps 1 and 2 ON (set and read by GUI after setting) but the 3rd one has turned ON anytime. When I turn the 3rd one ON, I want the GUI to change the lamp color and also the switch direction. I know commands to change the color of the lamp and switch position, but I am not getting how can I introduce this sensing part in my GUI.

In other words, I need a refresh function that can refresh the GUI at an as fast a rate as it can and then change the lamp colors accordingly.

Please let me know your inputs. Thanks a lot, in advance!

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Jay Vaidya 2021-6-6

>If an external function controls lamp 3, instead of changing it direclty it could call a local app function that controlls all of the lamp states.

I actually want the above. I have another MATLAB script running in parallel (which is not the GUI script but the GUI is still continuously running). If that MATLAB script turns on switch 3 then lamp 3 colors should change in the GUI as well, that is what I want. GUI and the other MATLAB scripts are not linked by any code.

So, I was thinking if I have a refresh callback function that can continuously sense which bit on the controller is high (and then change the switch direction to 'On' and lamp color to green). Of course, the GUI turning ON and OFF the switch and reading the status of the bit part is already done. But I'm wondering what I need to do when the bit is pulled up high not by the GUI but by an external user (using another MATLAB script in this case). In that case, too, my GUI should show the "correct status" of the lamps and switches. So my GUI should always know which bits are high/low. I have the commands to read the status which is why my GUI part is working. I need to add an additional feature to GUI which can help GUI read the status of bits always until GUI is running. Please let me know your inputs. Thanks.

Also, thanks for pointing out the MATLAB answers to my questions. I have reviewed a few, and still going through the rest. Hopefully, I will be done soon.

J. Alex Lee 2021-6-8

编辑：J. Alex Lee 2021-6-8

in response to built-in classes where the value is not observable, if you are using a matlab release that has the new custom ui component (https://www.mathworks.com/help/matlab/developing-custom-ui-component-classes.html), you can wrap your switches into a custom app where you can "fake" access into the switch value.

in fact, it probably makes sense to create a custom component anyway that bundles a switch with a lamp. a lamp doesn't appear to have a "Value" anyway.

by the way, i still do not understand the situation with the "external script that is not editable"...how exactly is it interacting with your hardware and/or gui?

Adam Danz 2021-6-8

For the lamp you'd listen to the color property (which is also not observable).

The only scenario I can imagine where this makes sense it's that OP is not the owner of the app nor the external script (I hope it's a function) and cannot make changes to either files and the switch can be changed by progresses not within OP's control.

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Answer 1

J. Alex Lee 2021-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/849010-auto-refresh-in-app-designer#answer_717925

in general for "auto refresh" you can use the timer object to schedule recurrent execution - disclaimer i have only played with this in non-GUI context with intent to eventually incorporate in a appdesigner app, but haven't got that far

https://www.mathworks.com/help/matlab/ref/timer-class.html

but if you mean you have hardware switches that your GUI is supposed to be somehow connected to, and if you flip physical switch 3, you need the GUI switch 3 to know about it, maybe there are other/better mechanisms through the software/hardware interface

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Jay Vaidya 2021-6-6

Thank you for your reply.

I have another MATLAB script running in parallel (which is not the GUI script but the GUI is still continuously running). If that MATLAB script turns on switch 3 then lamp 3 colors should change in the GUI as well, that is what I want. GUI and the other MATLAB scripts are not linked by any code.

So, I was thinking if I have a refresh callback function that can continuously sense which bit on the controller is high (and then change the switch direction to 'On' and lamp color to green). Of course, the GUI turning ON and OFF the switch and reading the status of the bit part is already done. But I'm wondering what I need to do when the bit is pulled up high not by the GUI but by an external user (using another MATLAB script in this case). In that case, too, my GUI should show the "correct status" of the lamps and switches. So my GUI should always know which bits are high/low. I have the commands to read the status which is why my GUI part is working. I need to add an additional feature to GUI which can help GUI read the status of bits always until GUI is running. Please let me know your inputs. Thanks.

J. Alex Lee 2021-6-7

you could give your other script access to your GUI switch to flip it on whenever it switches the actual switch, or if it is not allowed by appdesigner, you can provide a public method in your app that will do the switching that the second script can invoke

Jay Vaidya 2021-6-7

As I said, I cannot link the two by any means as the other script is not controllable. Also, the valve can be manually turned ON in which case what you are suggesting cannot work.

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