How to send key events to a dropdown?

General discussion
1

i try to send a LV_KEY_RIGHT/DOWN LV_KEY_LEFT/UP LY_KEY_ENTER to a dropdown list，but it has no effect.

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May I ask how to achieve this?

i try to do this again
image
it still has not effect.

I tried again for half a day。

group = lv_group_create();
lv_group_set_editing(group, false);
lv_group_add_obj(group, ddlist);
lv_group_send_data(group, LV_KEY_DOWN);
lv_group_send_data(group, LV_KEY_UP);
lv_group_send_data(group, LV_KEY_ENTER);

This way it can move the selection of ddList , but it can not apply the selected option for
LV_KEY_ENTER。

  • I tried something else in order to apply the selected option, but still no effect。

      id = lv_dropdown_get_selected(ddlist);
  printf("selected id = %d", id);
  lv_dropdown_set_selected(ddlist, id);   //unavailable     id's value changed by move list,but invalid
  //lv_dropdown_set_selected(ddlist, 0);    //avaliable       Direct assignment is valid.
  lv_dropdown_close(ddlist);

i can already move dropdown list, so i want to apply the selected option。Through the above method,it still no effect。

2

Please help me!

  • All that’s left is this dorpdown confirmation
3

LV_KEY_ENTER wasn’t processed by the dropdown. If you hit the enter key LV_EVENT_CLICK is also sent and only it was handled. I’ve pushed a fix for it.

With the latest v8 it worked for me:


    lv_dropdown_open(dd);
    uint32_t t = LV_KEY_DOWN;
    lv_event_send(dd, LV_EVENT_KEY, &t);
    lv_event_send(dd, LV_EVENT_KEY, &t);
    lv_event_send(dd, LV_EVENT_KEY, &t);
    t = LV_KEY_ENTER;
    lv_event_send(dd, LV_EVENT_KEY, &t);
4

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image2028×1018 236 KB

i try to use the four ways. it is failing.

5

I doesn’t work because you send the keys from an event.

I’ve fine tuned my earlier fix. Now it should work from events too.

6

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image1285×1088 109 KB

I’m sorry that I still don’t understand what you mean. Could you please tell me some examples

7

I’ve also modified the spinbox example like this:


static lv_obj_t * dd;


static void lv_spinbox_increment_event_cb(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    if(code == LV_EVENT_SHORT_CLICKED || code  == LV_EVENT_LONG_PRESSED_REPEAT) {
        uint32_t k = LV_KEY_UP;
        lv_event_send(dd, LV_EVENT_KEY, &k);
    }
}

static void lv_spinbox_decrement_event_cb(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    if(code == LV_EVENT_SHORT_CLICKED || code == LV_EVENT_LONG_PRESSED_REPEAT) {
        uint32_t k = LV_KEY_DOWN;
        lv_event_send(dd, LV_EVENT_KEY, &k);
    }
}

static void lv_spinbox_enter_event_cb(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    if(code == LV_EVENT_SHORT_CLICKED || code == LV_EVENT_LONG_PRESSED_REPEAT) {
        uint32_t k = LV_KEY_ENTER;
        lv_event_send(dd, LV_EVENT_KEY, &k);
    }
}

void dropdpwn_key_send(void)
{
    dd = lv_dropdown_create(lv_scr_act());
    lv_obj_set_width(dd, 150);
    lv_obj_center(dd);
    lv_obj_update_layout(dd);
    lv_coord_t h = lv_obj_get_height(dd);

    lv_obj_t * btn = lv_btn_create(lv_scr_act());
    lv_obj_set_size(btn, h, h);
    lv_obj_align_to(btn, dd, LV_ALIGN_OUT_RIGHT_MID, 5, 0);
    lv_obj_set_style_bg_img_src(btn, LV_SYMBOL_PLUS, 0);
    lv_obj_add_event_cb(btn, lv_spinbox_increment_event_cb, LV_EVENT_ALL,  NULL);

    btn = lv_btn_create(lv_scr_act());
    lv_obj_set_size(btn, h, h);
    lv_obj_align_to(btn, dd, LV_ALIGN_OUT_LEFT_MID, -5, 0);
    lv_obj_set_style_bg_img_src(btn, LV_SYMBOL_MINUS, 0);
    lv_obj_add_event_cb(btn, lv_spinbox_decrement_event_cb, LV_EVENT_ALL, NULL);


    btn = lv_btn_create(lv_scr_act());
    lv_obj_align_to(btn, dd, LV_ALIGN_OUT_TOP_MID, 0, -10);
    lv_obj_add_event_cb(btn, lv_spinbox_enter_event_cb, LV_EVENT_ALL, NULL);
}
8

This code should be v8. I am currently using V7.11.0. Could you please provide an example of V7.11.0? because I have everything else now, except this dropdown list “confirm” implementation.

9

I tried running this code in a v8 simulator.
It can move up and down, but it still doesn’t confirm.

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image920×176 26.9 KB

10

Please share to whole example to reproduce the issue.

11

Thank you very much. I tried it in the company some time ago, but it didn’t work. I think I didn’t get it right.