Enable/Disable texarea

General discussion
1

Dear all,
I am an electronic engineer and I created a container with some textarea. I want to enable textarea when the switch is off and to disable a textarea when the switch is ON. Is there some functions to disable/enable a textarea?

    tabview = lv_tabview_create(tabview_screen, NULL);
lan = lv_tabview_add_tab(tabview, "LAN");
wlan = lv_tabview_add_tab(tabview, "WLAN");
mqtt = lv_tabview_add_tab(tabview, "MQTT");
i_o_mapping_list = lv_tabview_add_tab(tabview, "IO MAPPING LIST");

cont = lv_cont_create(lan, NULL);
lv_obj_set_click(cont, false);
lv_obj_set_size(cont, SIZE_SCREEN_X, SIZE_SCREEN_Y);
static lv_style_t style;
lv_style_init(&style);
lv_cont_set_fit(cont, LV_FIT_NONE);
lv_cont_set_layout(cont,  LV_LAYOUT_COLUMN_LEFT);
lv_style_set_pad_inner(&style, LV_STATE_DEFAULT, INTERLINE_1);
lv_style_set_text_font(&style, LV_STATE_DEFAULT, &arial_18_font);
lv_obj_add_style(cont, LV_OBJ_PART_MAIN, &style);


int i = 0;
label_switch = lv_label_create (cont, NULL);
lv_obj_set_size(label_switch, 75, 75);
lv_label_set_text(label_switch, "DHCP");
switch_ = lv_switch_create(cont, NULL);
lv_obj_set_size(switch_, 110, 40);
lv_obj_set_event_cb(switch_, switch_event_cb);
lv_obj_set_user_data(switch_, (int *)1);

static lv_style_t style___label_switch;
lv_style_init(&style___label_switch);
lv_style_set_text_font(&style___label_switch, LV_STATE_DEFAULT, &arial_18_font);
lv_obj_add_style(label_switch, LV_OBJ_PART_MAIN, &style___label_switch);

static lv_style_t style___label;
lv_style_init(&style___label);
lv_style_set_text_font(&style___label, LV_STATE_DEFAULT, &arial_18_font);


static lv_style_t style___txt;
lv_style_init(&style___txt);
lv_style_set_text_font(&style___txt, LV_STATE_DEFAULT, &ali_font_16);

for(i=0;i<N_LABEL; i++){
	block_LAN[i].label = lv_label_create (cont, NULL);
	block_LAN[i].textarea = lv_textarea_create (cont, NULL);
	lv_obj_set_size(block_LAN[i].label, OBJ_W, OBJ_H);
	lv_obj_set_size(block_LAN[i].textarea, OBJ_W, OBJ_H);
	lv_label_set_text(block_LAN[i].label, vector_label_name[i]);
	lv_obj_set_user_data(block_LAN[i].textarea, (int *)i);
	lv_obj_set_event_cb(block_LAN[i].textarea, ta_event_cb);
	lv_textarea_set_text(block_LAN[i].textarea, "");
	lv_textarea_set_cursor_hidden(block_LAN[i].textarea, true);
	lv_obj_add_style(block_LAN[i].label , LV_OBJ_PART_MAIN, &style___label);
	lv_obj_add_style(block_LAN[i].textarea , LV_OBJ_PART_MAIN, &style___txt);
	lv_page_get_scrollable(block_LAN[i].textarea);

}

Another question, as you see implemeted the tab LAN: Is there a way to write in textarea in this format:
192.168.1.1 ?
Let me know.
Thanks in advance
Francesco Pugliese

2

Hi,

you can add an event callback to switch and call lv_obj_add/clear_state(textarea, LV_STATE_DISABLED). See Switch (lv_switch) — LVGL documentation

Yes, but it’s a little bit complicated now. See this example: Text area (lv_textarea) — LVGL documentation

3

dear kisvegabor,
thanks for fast reply.
I tried it but it doesn’ work. Why?

lv_obj_add_state(recipe.textarea, LV_STATE_DISABLED);
lv_obj_set_state(recipe.textarea, LV_STATE_DISABLED);

Thanks in advance
Let me know
Francesco Pugliese

4

Why, what happens?

Not that there is no lv_obj_set_state, only add and clear.

5

Thanks for fast reply. But it doesn t work. Why?
I am using lvgl 7.10.1
Let me know
Thanks in advance
Francesco Pugliese

6

Oh, I missed that it’s v7. But is should work quite same in v7 too.

But why is it now working? Compiler error? Does nothing? Freezes?

7

hello, thanks for fast reply. It doesn’t do anything. Why?
Let me know please.
Francesco Pugliese

8

Please post your current code.

9

Thanks for fast reply. Here you are my code.

static void event_handler_save_btn(lv_obj_t * obj, lv_event_t event){
	if(event == LV_EVENT_CLICKED ) {
		int *cmd = lv_obj_get_user_data(obj);
		if ((int)cmd == 1){
		    lv_obj_set_hidden(save_btn, false);
		    lv_obj_set_hidden(mod_btn, true);
		    lv_obj_add_state(recipe.textarea, LV_STATE_DISABLED);
		    lv_obj_set_click(add_btn, false);
		}
		if ((int)cmd == 2){
		    lv_obj_set_hidden(mod_btn, false);
		    lv_obj_set_hidden(save_btn, true);
		    lv_obj_set_click(add_btn, true);
		    lv_slider_set_value(recipe.speed_cutter_slider, 0, LV_ANIM_ON);
			lv_slider_set_value(recipe.speed_press_slider, 0, LV_ANIM_ON);
			lv_textarea_set_text(recipe.textarea, "");
			lv_label_set_text(recipe.label_slider_value_cutter, "");
			lv_label_set_text(recipe.label_slider_value_press, "");
			lv_checkbox_set_checked(recipe.checkbox_air, false);
		}
	}

why doesn’t work ?

10

if ((int)cmd == 1){

Is it correct? Shouldn’t be if (*cmd == 1){?

Are you sure the text are has a style which makes it different when it’s in disabled state?