LVGL ---文本3

static void ta_event_cb(lv_event_t * e);

static lv_obj_t * kb;

/**

• Automatically format text like a clock. E.g. “12:34”

• Add the ‘:’ automatically.
  */
  void lv_example_textarea_3(void)
  {
  /Create the text area/
  lv_obj_t * ta = lv_textarea_create(lv_scr_act());
  lv_obj_add_event_cb(ta, ta_event_cb, LV_EVENT_VALUE_CHANGED, NULL);
  lv_textarea_set_accepted_chars(ta, “0123456789:”);
  lv_textarea_set_max_length(ta, 5);
  lv_textarea_set_one_line(ta, true);
  lv_textarea_set_text(ta, “”);

  /Create a keyboard/
  kb = lv_keyboard_create(lv_scr_act());
  lv_obj_set_size(kb, LV_HOR_RES, LV_VER_RES / 2);
  lv_keyboard_set_mode(kb, LV_KEYBOARD_MODE_NUMBER);
  lv_keyboard_set_textarea(kb, ta);
  }

static void ta_event_cb(lv_event_t * e)
{
lv_obj_t * ta = lv_event_get_target(e);
const char * txt = lv_textarea_get_text(ta);
if(txt[0] >= ‘0’ && txt[0] <= ‘9’ &&
txt[1] >= ‘0’ && txt[1] <= ‘9’ &&
txt[2] != ‘:’) {
lv_textarea_set_cursor_pos(ta, 2);
lv_textarea_add_char(ta, ‘:’);
}
}