移植RTGUI后，使用RealBoard4088的按键驱动切换画面，出现一次按键，触发两次事件的异常

static void key_thread_entry(void *parameter)
{
    rt_time_t next_delay;
    struct rtgui_event_kbd kbd_event;

    key_gpio_config();

    /* init keyboard event */
    RTGUI_EVENT_KBD_INIT(&kbd_event);
    kbd_event.wid = RT_NULL;
    kbd_event.mod  = RTGUI_KMOD_NONE;
    kbd_event.unicode = 0;

    while (1)
    {
        next_delay = 10;
        kbd_event.key = RTGUIK_UNKNOWN;
        kbd_event.type = RTGUI_KEYDOWN;

        if (key_left_GETVALUE()    == 0)
        {
						rt_thread_delay(next_delay*2);
						
						if(key_left_GETVALUE()    == 0)
						{
							rt_kprintf("key_left
");
							kbd_event.key  = RTGUIK_LEFT;
						}
        }

        if (key_right_GETVALUE()  == 0)
        {
						rt_thread_delay(next_delay*2);
						
						if(key_right_GETVALUE()    == 0)
						{
							rt_kprintf("key_right
");
							kbd_event.key  = RTGUIK_RIGHT;
						}
        }


        if (kbd_event.key != RTGUIK_UNKNOWN)
        {
            /* post down event */
            rtgui_server_post_event(&(kbd_event.parent), sizeof(kbd_event));

            next_delay = 10;
            /* delay to post up event */
            rt_thread_delay(next_delay);

            /* post up event */
            kbd_event.type = RTGUI_KEYUP;
            rtgui_server_post_event(&(kbd_event.parent), sizeof(kbd_event));
        }

        /* wait next key press */
        rt_thread_delay(next_delay);
    }
}

rt_thread_delay(next_delay);

/* post up event */
kbd_event.type = RTGUI_KEYUP;
rtgui_server_post_event(&(kbd_event.parent), sizeof(kbd_event));

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