Trigger an event in Sqaureline based on a Value

How-to
1

Hi,

All the trigger criteria in Squareline for adding an event is based on touch events. Is there anyway we could trigger a function based on a value (for example slider value) or timer?

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For example, Remove hidden flag for a panel after 5 seconds. or when the slider value is 10.

Thanks

2

I’m fairly certain there is no timer functionality for SquareLine, you would have to implement something like this in lvgl itself.

For the slider value, there is a trigger called VALUE_CHANGED. You could use this to call a custom function under the “action” setting, in this custom function you could read out the value in the slider and change the hidden flag there.

1 Like
5

Thanks for taking the time.
I did try VALUE_CHANGED. But that is only when the value changes(which is the same as a click) not based on a specific value. VALUE_CHANGED to me works the same way as Clicked.
I was looking for some Value condition (==, >, <).

Thanks.

6

Sadly there is no functionality for this as far as I know. I think the simplest option would be calling a custom function on VALUE_CHANGED and comparing a value there.

In the files generated by SquareLine there should be a new file called ui_events.c. Here you can find the custom function defined as void myCustomFunction(lv_event_t * e).

using the lv_event_get_target(e) function you get an lv_obj_t* to the LVGL object that caused the event.

From here you can use lv_slider_get_value(target) to retrieve the value in the slider and compare it to some required value.