Set LV_STATE_FOCUSED manually and catch the LV_EVENT_DEFOCUSED

How-to
1

Description

I want to catch the defocus event of a roller, whenever I touch other areas than rollers.
So after the creation of the roller, I added this line:

lv_obj_add_state(roller_spo2_min, LV_STATE_FOCUSED);

But it doesn’t catch this event unless I touch the roller.-changing its value or click on it.-

What MCU/Processor/Board and compiler are you using?

stm32f429, gcc

What LVGL version are you using?

lvgl 8.1

What do you want to achieve?

catch the defocus event of an object -here it is a roller- even if I didn’t touch it.

What have you tried so far?

setting the roller’s state manually to LV_STATE_FOCUSED after its creation.

2

AFAIU, it’s because of this line:

proc->types.pointer.last_pressed = obj_to_focus;

in the body of indev_click_focus function. which is called when we really touch the CTP. right?
So, Any suggestions for solving the problem?

3

So Is there any idea?:thinking: @kisvegabor @embeddedt

4

You are right that indev_click_focus won’t defocus any arbitrary items but only the one which was clicked before.

You can do hack like this:

    lv_obj_add_state(roller1, LV_STATE_FOCUSED);
    extern lv_indev_t * my_indev;
    my_indev->proc.types.pointer.last_pressed = roller1;

There could be an API function for this, but I’m not sure if it’s a good idea to expose this internal functionality to the user.

1 Like
5

It worked, thanks.:tada::pray:
But you know, when we use this:

   lv_obj_add_state(roller1, LV_STATE_FOCUSED);

we expect to catch a defocused event in the roller’s callback.
Can’t we do sth about this? What do you think?

6

The problem is that the roller won’t be defocused as the pointer defocuses only the widget is focused earlier.