Binding lv_obj in editor

How-to
1

If I have a <lv_obj style_bg_color=“some color” height=“some height” width=“some width” x=“150” />

The goal is this a banner on the top right of the screen that has a label and the label and baground could change based on an external message. I have multiple screens and the position is fixed the bg_color and text can change.

What would be the best way to bind this object and label to an external source.

2

If you want your object to remain visible on all screens, then use the lv_layer_top() as the parent,
Right now, it’s not supported in XML, you have to do this in C code

https://docs.lvgl.io/master/main-modules/display/screen_layers.html

3

Thanks for that information.
Is it possible to treat this object as a subject and then change the baground color and/or text that always in this banner based on an external message in lvgl ?

I’m trying to ensure this banner think of it as notification appears on the active screen with text and a specific baground color. Is show/hide a better approach ? But then this would mean each screen would have repetition of possible background color and text.

4

@embdev, I suggest you use a Subject to control the object’s actions. You can subscribe to any object using an Observer.
LVGL Docs

static void your_observe(lv_observer_t * observer, lv_subject_t * subject)
{
/* Change the background color whenever you want.*/
}
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