触摸反馈时蜂鸣器响的问题

Jochen

官方文档给出的接口是

1. void (*feedback_cb)(struct _lv_indev_drv_t *, uint8_t);

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触发事件是

1. enum {
   
2.     LV_EVENT_PRESSED,             /**< The object has been pressed*/
   
3.     LV_EVENT_PRESSING,            /**< The object is being pressed (called continuously while pressing)*/
   
4.     LV_EVENT_PRESS_LOST,          /**< User is still pressing but slid cursor/finger off of the object */
   
5.     LV_EVENT_SHORT_CLICKED,       /**< User pressed object for a short period of time, then released it. Not called if dragged. */
   
6.     LV_EVENT_LONG_PRESSED,        /**< Object has been pressed for at least `LV_INDEV_LONG_PRESS_TIME`.  Not called if dragged.*/
   
7.     LV_EVENT_LONG_PRESSED_REPEAT, /**< Called after `LV_INDEV_LONG_PRESS_TIME` in every
   
8.                                        `LV_INDEV_LONG_PRESS_REP_TIME` ms.  Not called if dragged.*/
   
9.     LV_EVENT_CLICKED,             /**< Called on release if not dragged (regardless to long press)*/
   
10.     LV_EVENT_RELEASED,            /**< Called in every cases when the object has been released*/                                    
    
11.     LV_EVENT_DRAG_BEGIN,                  
    
12.     LV_EVENT_DRAG_END,
    
13.     LV_EVENT_DRAG_THROW_BEGIN,
    
14.     LV_EVENT_KEY,
    
15.     LV_EVENT_FOCUSED,
    
16.     LV_EVENT_DEFOCUSED,
    
17.     LV_EVENT_VALUE_CHANGED,                 /**< The object's value has changed (i.e. slider moved) */
    
18.     LV_EVENT_INSERT,
    
19.     LV_EVENT_REFRESH,
    
20.     LV_EVENT_APPLY,  /**< "Ok", "Apply" or similar specific button has clicked*/
    
21.     LV_EVENT_CANCEL, /**< "Close", "Cancel" or similar specific button has clicked*/
    
22.     LV_EVENT_DELETE, /**< Object is being deleted */
    
23. };
    
24. typedef uint8_t lv_event_t; /**< Type of event being sent to the object. */

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测试用的LV_EVENT_CLICKED事件，

发现无论触摸哪个位置，包括空白的背景图，都会触发事件，然后蜂鸣器响一声；
现在想做到只有点击到有效对象（即按钮，文本域，键盘等）时蜂鸣器才响一声，求助有知道怎么弄吗？