K1Guitar/APP/app_touch.c

#include "includes.h"

/* ============================================================================
 * app_touch ʵ<EFBFBD><EFBFBD>
 *
 * ״̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ Touch_Process һ<EFBFBD>£<EFBFBD><EFBFBD><EFBFBD>
 *   IDLE <EFBFBD><EFBFBD> PRESS_WAIT_STABLE <EFBFBD><EFBFBD> PRESS_STABLE <EFBFBD><EFBFBD> SLIDING
 *
 * ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 *   <EFBFBD>ȶ<EFBFBD><EFBFBD>ж<EFBFBD>  20ms     (TOUCH_STABLE_TIME)
 *   <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ  10px     (TOUCH_SLIDE_THRESH)
 *   <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>  5px      (TOUCH_SLIDE_STEP)
 *   <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>  1000ms   (TOUCH_LONG_PRESS_TIME)
 *   <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD>  120ms    (TOUCH_REPEAT_INTERVAL)
 * ==========================================================================*/

/* ==================== ״̬<D7B4><CCAC>ö<EFBFBD><C3B6> ==================== */
typedef enum {
    TOUCH_IDLE,                /* <20><><EFBFBD><EFBFBD> */
    TOUCH_PRESS_WAIT_STABLE,   /* <20><><EFBFBD>£<EFBFBD><C2A3>ȴ<EFBFBD><C8B4>ȶ<EFBFBD><C8B6>ж<EFBFBD> */
    TOUCH_PRESS_STABLE,        /* <20>ȶ<EFBFBD><C8B6><EFBFBD><EFBFBD>£<EFBFBD><C2A3>ɳ<EFBFBD><C9B3><EFBFBD><EFBFBD><EFBFBD> */
    TOUCH_SLIDING              /* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
} touch_state_t;

/* ==================== ʱ<><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ==================== */
#define TOUCH_STABLE_TIME        20     /* <20><><EFBFBD><EFBFBD><EFBFBD>ȶ<EFBFBD><C8B6>ж<EFBFBD>ʱ<EFBFBD><CAB1> ms */
#define TOUCH_SLIDE_THRESH       10     /* <20><><EFBFBD>뻬<EFBFBD><EBBBAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Сλ<D0A1><CEBB> px */
#define TOUCH_SLIDE_STEP         5      /* <20><><EFBFBD><EFBFBD><EFBFBD>¼<EFBFBD><C2BC><EFBFBD>С<EFBFBD><D0A1><EFBFBD><EFBFBD> px */
#define TOUCH_LONG_PRESS_TIME    1000   /* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ms */
#define TOUCH_REPEAT_INTERVAL    120    /* <20><><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD><D8B8><EFBFBD><EFBFBD><EFBFBD> ms */

/* ==================== ״̬<D7B4><CCAC><EFBFBD><EFBFBD> ==================== */
static touch_state_t touch_state = TOUCH_IDLE;
static uint16_t down_x = 0;
static uint16_t down_y = 0;
static uint32_t touch_tick = 0;
static uint32_t repeat_tick = 0;
static uint8_t  long_press_fired = 0;
static uint16_t last_slide_x = 0;
static uint16_t last_slide_y = 0;

/* ȡ<><C8A1><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> math.h<><68> */
static inline uint16_t abs_diff(int16_t a, int16_t b)
{
    int16_t d = a - b;
    return (d < 0) ? (uint16_t)(-d) : (uint16_t)d;
}

/* ==================== <20><><EFBFBD><EFBFBD> ==================== */

void app_touch_reset(void)
{
    touch_state = TOUCH_IDLE;
    down_x = down_y = 0;
    touch_tick = repeat_tick = 0;
    long_press_fired = 0;
    last_slide_x = last_slide_y = 0;
}

/* ==================== <20><><EFBFBD><EFBFBD>ʶ<EFBFBD><CAB6> ==================== */

app_touch_result_t app_touch_process(uint16_t x, uint16_t y, uint8_t pressed)
{
    app_touch_result_t r;
    r.gesture = GESTURE_NONE;
    r.x = x; r.y = y;
    r.down_x = down_x; r.down_y = down_y;

    uint32_t now = rt_tick_get();

    /* ---------- ̧<><CCA7><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ---------- */
    if (!pressed) {
        /* <20><><EFBFBD><EFBFBD><EFBFBD>ȶ<EFBFBD><C8B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>δ<EFBFBD><CEB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20>ͷţ<CDB7><C5A3>ɵ<EFBFBD><C9B5><EFBFBD> TAP<41><50> */
        if (touch_state == TOUCH_PRESS_STABLE && !long_press_fired) {
            r.gesture = GESTURE_RELEASE;
            r.x = down_x; r.y = down_y;   /* <20>ð<EFBFBD><C3B0>µ<EFBFBD><C2B5><EFBFBD>Ϊ<EFBFBD>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD><EFBFBD> */
        }
        touch_state = TOUCH_IDLE;
        down_x = down_y = 0;
        last_slide_x = last_slide_y = 0;
        touch_tick = repeat_tick = 0;
        long_press_fired = 0;
        return r;
    }

    /* ---------- <20><><EFBFBD>´<EFBFBD><C2B4><EFBFBD> ---------- */
    switch (touch_state)
    {
        case TOUCH_IDLE:
            down_x = x;
            down_y = y;
            touch_tick = now;
            long_press_fired = 0;
            repeat_tick = 0;
            touch_state = TOUCH_PRESS_WAIT_STABLE;
            break;

        case TOUCH_PRESS_WAIT_STABLE:
            if ((now - touch_tick) >= TOUCH_STABLE_TIME) {
                /* λ<><CEBB>С <20><> <20><><EFBFBD><EFBFBD><EFBFBD>ȶ<EFBFBD> */
                if (abs_diff(x, down_x) < 8 && abs_diff(y, down_y) < 8) {
                    touch_state = TOUCH_PRESS_STABLE;
                    last_slide_x = down_x;
                    last_slide_y = down_y;
                    touch_tick = now;
                    MainTask_Sendmsg(MSG_ID_TOUCH, 1, down_x, down_y);
                } else {
                    /* λ<>ƴ<EFBFBD> <20><> <20><>Ϊ<EFBFBD>󴥣<EFBFBD><F3B4A5A3>ص<EFBFBD><D8B5><EFBFBD><EFBFBD><EFBFBD> */
                    touch_state = TOUCH_IDLE;
                }
            }
            break;

        case TOUCH_PRESS_STABLE:
        {
            /* ----- <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ----- */
            if (!long_press_fired && (now - touch_tick) >= TOUCH_LONG_PRESS_TIME) {
                long_press_fired = 1;
                repeat_tick = now;
                r.gesture = GESTURE_LONG_PRESS;
                MainTask_Sendmsg(MSG_ID_TOUCH_LONG_REPEAT, 1, down_x, down_y);
                return r;
            }
            /* ----- <20><><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD> ----- */
            if (long_press_fired && (now - repeat_tick) >= TOUCH_REPEAT_INTERVAL) {
                repeat_tick = now;
                r.gesture = GESTURE_REPEAT;
                MainTask_Sendmsg(MSG_ID_TOUCH_LONG_REPEAT, 1, down_x, down_y);
                return r;
            }
            /* ----- λ<>ƽ<EFBFBD><C6BD>뻬<EFBFBD><EBBBAC> ----- */
            if (abs_diff(x, down_x) >= TOUCH_SLIDE_THRESH ||
                abs_diff(y, down_y) >= TOUCH_SLIDE_THRESH) {
                touch_state = TOUCH_SLIDING;
                last_slide_x = x;
                last_slide_y = y;
            }
            break;
        }

        case TOUCH_SLIDING:
        {
            /* λ<>Ƴ<EFBFBD><C6B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD>϶<EFBFBD><CFB6>¼<EFBFBD> */
            if (abs_diff(x, last_slide_x) >= TOUCH_SLIDE_STEP ||
                abs_diff(y, last_slide_y) >= TOUCH_SLIDE_STEP) {
                r.gesture = GESTURE_DRAG;
                r.down_x = last_slide_x;   /* <20><>¼<EFBFBD>ϴ<EFBFBD>λ<EFBFBD>ã<EFBFBD><C3A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ѷ<EFBFBD><D1B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
                r.down_y = last_slide_y;
                MainTask_Sendmsg(MSG_ID_TOUCH, 1, x, y);
                last_slide_x = x;
                last_slide_y = y;
                return r;
            }
            break;
        }

        default:
            touch_state = TOUCH_IDLE;
            break;
    }

    return r;   /* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
}