用来实现一些UI交互真的很方便，记录下来方便以后自己开发用到。
添加标志的接口：

/**
 * Set one or more flags
 * @param obj   pointer to an object
 * @param f     OR-ed values from `lv_obj_flag_t` to set.
 */
void lv_obj_add_flag(lv_obj_t * obj, lv_obj_flag_t f);

lv_obj_add_flag 是 LVGL 中用于给对象（lv_obj_t）添加功能标志的核心接口，通过这些标志可以快速修改对象的行为或特性.
标志可以支持按位或。

标志解析：

/**
 * On/Off features controlling the object's behavior.
 * OR-ed values are possible
 *
 * Note: update obj flags corresponding properties below
 * whenever add/remove flags or change bit definition of flags.
 */
typedef enum {
//基础交互与控制显示
	//隐藏对象
    LV_OBJ_FLAG_HIDDEN          = (1L << 0),  /**< Make the object hidden. (Like it wasn't there at all)*/
    //允许接收点击/触摸事件
    LV_OBJ_FLAG_CLICKABLE       = (1L << 1),  /**< Make the object clickable by the input devices*/
    //点击对象时自动添加“聚焦”状态，用于需要焦点的组件，如输入框
    LV_OBJ_FLAG_CLICK_FOCUSABLE = (1L << 2),  /**< Add focused state to the object when clicked*/
    //点击时切换选中状态
    LV_OBJ_FLAG_CHECKABLE       = (1L << 3),  /**< Toggle checked state when the object is clicked*/
    
//滚动相关（适用于容器/可滚动对象）
    //允许对象被滚动，如列表、文本区域等容器需添加此标志
    LV_OBJ_FLAG_SCROLLABLE      = (1L << 4),  /**< Make the object scrollable*/
    // 滚动到边界时允许弹性效果（超过界面后缓慢回弹。类似手机界面的滚动体验）
    LV_OBJ_FLAG_SCROLL_ELASTIC  = (1L << 5),  /**< Allow scrolling inside but with slower speed*/
    //支持“惯性滚动”（滑动后对象会因惯性继续滚动一段距离）
    LV_OBJ_FLAG_SCROLL_MOMENTUM = (1L << 6),  /**< Make the object scroll further when "thrown"*/
    // 限制一次滚动，只能切换到下一个/上一个 "可吸附"子对象（如轮播图切换页面）
     LV_OBJ_FLAG_SCROLL_ONE      = (1L << 7),  /**< Allow scrolling only one snappable children*/
    //水平滚动时，若当前对象滚动到边界，将滚动事件传递给父对象。（如嵌套列表的横向滚动传递）
    LV_OBJ_FLAG_SCROLL_CHAIN_HOR = (1L << 8), /**< Allow propagating the horizontal scroll to a parent*/
    // 垂直滚动时，时间传递给父对象（同上，适用于纵向）
    LV_OBJ_FLAG_SCROLL_CHAIN_VER = (1L << 9), /**< Allow propagating the vertical scroll to a parent*/
	//等价于HOR + VER 同时允许水平和垂直事件传递给父对象
    LV_OBJ_FLAG_SCROLL_CHAIN     = (LV_OBJ_FLAG_SCROLL_CHAIN_HOR | LV_OBJ_FLAG_SCROLL_CHAIN_VER),
	//当对象获得焦点时，自动滚动父对象容器使其完全可见（如长列表中聚焦某个项时自动定位）
    LV_OBJ_FLAG_SCROLL_ON_FOCUS = (1L << 10),  /**< Automatically scroll object to make it visible when focused*/
    // 允许通过方向滚动键滚动聚焦对象（适用于键盘操作）
    LV_OBJ_FLAG_SCROLL_WITH_ARROW  = (1L << 11), /**< Allow scrolling the focused object with arrow keys*/
	// 若父对象启用了“滚动吸附”，则滚动时会自动对齐到该对象（如网格布局中的子项吸附）
    LV_OBJ_FLAG_SNAPPABLE       = (1L << 12), /**< If scroll snap is enabled on the parent it can snap to this object*/
	
// 事件与手势传递
    // 按下对象后即使手指/鼠标滑出对象范围，仍保持“按下”转态（如网格布局中的子项吸附）
    LV_OBJ_FLAG_PRESS_LOCK      = (1L << 13), /**< Keep the object pressed even if the press slid from the object*/
	// 事件冒泡：对象触发的事件会传递给父对象（如子按钮点击事件同时通知父容器）
    LV_OBJ_FLAG_EVENT_BUBBLE    = (1L << 14), /**< Propagate the events to the parent too*/
	//手势冒泡：对象识别的手势（如滑动、缩放）会传递给父对象
    LV_OBJ_FLAG_GESTURE_BUBBLE  = (1L << 15), /**< Propagate the gestures to the parent*/
    
//布局与绘制控制
	//启用精确点击检测（如忽略圆角外的区域，默认点击检测师矩形区域）
	LV_OBJ_FLAG_ADV_HITTEST     = (1L << 16), /**< Allow performing more accurate hit (click) test. E.g. consider rounded corners.*/
	//使对象不受父容器的布局管理器（Flex/Grid)控制，需要手动设置位置（lv_obj_set_pos)
    LV_OBJ_FLAG_IGNORE_LAYOUT   = (1L << 17), /**< Make the object not positioned by the layouts*/
	//浮动模式：不受父容器滚动影响，切忽略布局（结合IGNORE_LAYOUT，适用于悬浮组件如弹窗）
    LV_OBJ_FLAG_FLOATING        = (1L << 18), /**< Do not scroll the object when the parent scrolls and ignore layout*/
	//发送绘制任务相关事件（LV_EVENT_DRAW_TASK_ADDED),用于监控绘制过程。
    LV_OBJ_FLAG_SEND_DRAW_TASK_EVENTS = (1L << 19), /**< Send `LV_EVENT_DRAW_TASK_ADDED` events*/
	//允许子对象超过父对象的绘制范围（默认子对象会被父对象裁剪）
    LV_OBJ_FLAG_OVERFLOW_VISIBLE = (1L << 20),/**< Do not clip the children to the parent's ext draw size*/

//当启用Flex布局时有效
#if LV_USE_FLEX
    // 强制当前Flex子项单独占一行
    LV_OBJ_FLAG_FLEX_IN_NEW_TRACK = (1L << 21),     /**< Start a new flex track on this item*/
#endif
	//布局专用自定义标志，供LVGL内部布局管理器或用户自定义布局使用
    LV_OBJ_FLAG_LAYOUT_1        = (1L << 23), /**< Custom flag, free to use by layouts*/
    LV_OBJ_FLAG_LAYOUT_2        = (1L << 24), /**< Custom flag, free to use by layouts*/
	//组件专用自定义标志，供LVGL内置组件（如按钮、滑块）或用户自定义组件使用
    LV_OBJ_FLAG_WIDGET_1        = (1L << 25), /**< Custom flag, free to use by widget*/
    LV_OBJ_FLAG_WIDGET_2        = (1L << 26), /**< Custom flag, free to use by widget*/
    //用户自定义标志，完全由开发者使用（标志对象状态/分组等）
    LV_OBJ_FLAG_USER_1          = (1L << 27), /**< Custom flag, free to use by user*/
    LV_OBJ_FLAG_USER_2          = (1L << 28), /**< Custom flag, free to use by user*/
    LV_OBJ_FLAG_USER_3          = (1L << 29), /**< Custom flag, free to use by user*/
    LV_OBJ_FLAG_USER_4          = (1L << 30), /**< Custom flag, free to use by user*/
} lv_obj_flag_t;