Fast swipe not detected

How-to
1

Description

What MCU/Processor/Board and compiler are you using?

  • ESP32-S3 SC01 Plus
  • Esp-Arduino
  • LovyanGFX
  • Touch_FT5x06

What LVGL version are you using?

9.0.0-dev

What do you want to achieve?

Detect left/right swipe on the screen (to move to the next screen).

What have you tried so far?

Implemented swipe detection from here How to create a swipe left/right event

Code to reproduce

void scr_event_cb(lv_event_t *e)
{

    if (i++ < 150 || lv_event_get_code(e) > 18)
        return;

    Serial.printf("Got screen event %d\n", lv_event_get_code(e));
    if (lv_event_get_code(e) == LV_EVENT_GESTURE)
    {
        lv_dir_t dir = lv_indev_get_gesture_dir(lv_indev_get_act());
        Serial.printf("Dir %d\n", dir);
        for (size_t i = 255; i > 0; i = i - 5)
        {
            setBL(i);
            delay(3);
        }

        for (size_t i = 0; i < 255; i = i + 5)
        {
            setBL(i);
            delay(3);
        }
    }
    // ingesture=millis()+300;
}


void ui_init(void)
{
...
    lv_obj_add_event_cb(lv_scr_act(), scr_event_cb, LV_EVENT_ALL, NULL);
}

Issue

Most of the swipe are detected correctly, just that, when I swipe fast (the normal speed on a mobile phone I would say), I would sometime not get a LV_EVENT_GESTURE event, only the other normal events like LV_EVENT_PRESSED, LV_EVENT_FOCUSED, LV_EVENT_DEFOCUSED of the elements I swipe over.

When I swipe more gently, I always get the LV_EVENT_GESTURE. Is there a max velocity somewhere, or a refresh rate I should increase?

Sidenote: I discovered LVGL few weeks ago, thanks for this awesome work!