I don't want to show the leading zeros of the lv_spinbox

How-to
1

Hi, Master
Version : LVGL v9.1
Problem :
I want to disable leading zeros in lv_spinbox . For example, when the spinbox display range is 0.0~999.9 , the integer part has a dynamic number of digits. Currently, using lv_spinbox_set_digit_format(spinbox, 4, 3); displays unnecessary leading zeros (e.g., 005.6 ). I want it to show only the truly significant digits in the integer part (e.g., 5.6 ).
Thanks

2

You can add something like this:

lv_spinbox_add_event_cb( spinbox, spinbox_value_changed_cb, LV_EVENT_VALUE_CHANGED, NULL );

void spinbox_value_changed_cb( lv_event_t* e ) 
{
    lv_obj_t* spinbox = lv_event_get_target_obj( e );
    int32_t value = lv_spinbox_get_value( spinbox );

    if ( value >= 0 && value <= 9 )
    {       
        lv_spinbox_set_digit_format(spinbox, 2, 1);
        return;
    }
    else if ( value >= 10 && value <= 99 )
    {       
        lv_spinbox_set_digit_format(spinbox, 3, 2);
        return;
    }
    else if ( value >= 100 && value <= 999 )
    {       
        lv_spinbox_set_digit_format(spinbox, 4, 3);
        return;
    }
}
3

OK, Thank you very much.

4

I’ve tried this, and it only partially works for me.
Yes, the leading zero is suppressed, but it also seems to set the spinbox maximum range, but only downwards.E.g.-
lv_spinbox_set_digit_format(spinbox, 1, 0); lv_spinbox_set_value(spinbox, 5);
displays “5” correctly, then followed by -
lv_spinbox_set_digit_format(spinbox, 2, 0); lv_spinbox_set_value(spinbox, 15);
displays “09”
It also seems to upset the center alignment of the number.in the box.

UPDATE

Using this to update the spinbox value avoids the problems I mentioned above -

void LvSetSpinboxVal(lv_obj_t* sb, int v) {
  int c = (v < 10) ? 1 : 2;
  int max = (v < 10) ? 9 : 99;
  lv_spinbox_set_digit_format(sb, c, 0);
  lv_spinbox_set_range(sb, 0, max);
  lv_spinbox_set_value(sb, v);
}
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