Modify the ON/OFF status of the label

How-to
1

图片

Hi everyone,
In the button of list case, how can I modify the ON/OFF status of the label?

  Emm...I am sorry that i am one of the leeches in LVGL forum and no contribute at all...

Best regards
Lucas

2

Hi,

It depends on how you implemented the list. Please send a short code snippet to see it.

3

微信图片_20200810101643

Hi @kisvegabor,
I only achieve like this so far. How can I show the two txt in a label? Should I use a great many blanks to connect Channel-1with ON/OFF? And my code:

const char * txts[1][13] =
{
     {TYM_SYMBOL_ACTIVITY_ON, "Channel-1", TYM_SYMBOL_ACTIVITY_ON, "Channel-2",
     TYM_SYMBOL_ACTIVITY_ON, "Channel-3",TYM_SYMBOL_ACTIVITY_ON, "Channel-4",NULL},	
}

struct pageInfo
{
lv_obj_t * cont;
lv_group_t * group;
const char ** txt;
lv_obj_t * list;
bool hide;
};

void MasterMenu_create(PageInfo * info)
{
 lv_obj_t * parent = info->cont;
 lv_obj_set_auto_realign(parent, true);
 lv_obj_align_origo(parent, NULL, LV_ALIGN_CENTER, 0, 0);
 lv_cont_set_fit(parent, LV_FIT_TIGHT);
 lv_cont_set_layout(parent, LV_LAYOUT_COLUMN_MID);

 btn =  lv_btn_create(parent,NULL);
 lv_obj_set_size(btn,320,40);
 lv_obj_set_pos(btn, 0, 0);

 title_label1 =  lv_label_create(btn,NULL);
 lv_label_set_text(title_label1, TYM_SYMBOL_BACK_LEFT"  Master Menu");
 lv_label_set_align(title_label1,LV_LABEL_ALIGN_LEFT);
 lv_btn_set_layout(btn,LV_LAYOUT_ROW_MID);

 info->list = lv_list_create(parent, NULL);
 lv_obj_set_size(info->list, 320, 200);
 lv_obj_set_pos(info->list,0,40);
 uint32_t i;
 for(i = 0; info->txt[i] != NULL; i+=2)
 {
     list_btn = lv_list_add_btn(info->list, info->txt[i], info->txt[i+1]);
     lv_obj_move_foreground(lv_list_get_btn_label(list_btn));
     lv_btn_set_checkable(list_btn, true);
     lv_group_add_obj(info->group, list_btn);
 }
}

Thanks a lot!

4

Thanks!

I’ve added a minor fix to the master branch of LVGL to make possible adding extra label to list button like this:

    lv_obj_t * label = lv_label_create(list_btn, NULL);
    lv_obj_add_protect(label, LV_PROTECT_POS);
    lv_label_set_text(label, "On");
    lv_obj_align(label, NULL, LV_ALIGN_IN_RIGHT_MID, -15, 0);

    ...
    /*Get the label later from the list button (e.g. in an event)*/
    label = lv_obj_get_child(list_btn, NULL);
    lv_label_set_text(label, "Off");
    lv_obj_align(label, NULL, LV_ALIGN_IN_RIGHT_MID, -15, 0);
5

Hi @kisvegabor,
Thanks! It is working!

 Actually, I have an idea. Could we have the API--`lv_lable_set_cell_value` just like `lv_table_set_cell_value`?

Best reagard,
lucas

6

Can you describe what could this function exacly do?

7

For using label in some complex case…

8

Hi gabor,

 I need to achieve this,

微信图片_20200905105138
But here’s what’s been achieved so far.
图片

Meanwhile, It doesn’t work I use lv_obj_set_size either. The label’s coords always is small, which is seemed like that changed by signal in call stack.
微信图片_20200905135221

9

You’ll probably need to change the label’s text wrapping policy to change its size.