（NGUI）监听事件方法

using UnityEngine;

namespace UI
{
    public class UIEventListener : MonoBehaviour
    {
        public int id;

        public delegate void SubmitDelegate();
        public event SubmitDelegate onSubmit;
        void OnSubmit()
        {
            if (onSubmit != null)
                onSubmit();
        }

        public delegate void ClickDelegate();
        public event ClickDelegate onClick;
        public delegate void ClickDelegateEX(int id);
        public event ClickDelegateEX onClickEX;
        /// <summary>
        /// 鼠标或触摸单击（按下并释放）时触发。
        /// </summary>
        void OnClick()
        {
            if (onClick != null)
                onClick();

            if (onClickEX != null)
                onClickEX(id);
        }

        public delegate void DoubleClickDelegate();
        public event DoubleClickDelegate onDoubleClick;
        /// <summary>
        /// 双击（双击时间间隔小于0.25秒）时触发。
        /// </summary>
        void OnDoubleClick()
        {
            if (onDoubleClick != null)
                onDoubleClick();
        }

        public delegate void HoverDelegates(bool isOver);
        public event HoverDelegates onHover;
        /// <summary>
        /// 鼠标悬停或移出时触发。悬停时传入true，移出时传入false。
        /// </summary>
        /// <param name="isOver"></param>
        void OnHover(bool isOver)
        {
            if (onHover != null)
                onHover(isOver);
        }

        public delegate void PressDelegate(bool isPressed);
        public event PressDelegate onPress;
        /// <summary>
        /// 鼠标或触摸按下或松开时触发，按下时传入true，松开时传入false。
        /// </summary>
        /// <param name="isPressed"></param>
        void OnPress(bool isPressed)
        {
            if (onPress != null)
                onPress(isPressed);
        }

        public delegate void SelectDelegate(bool selected);
        public event SelectDelegate onSelect;
        /// <summary>
        /// 类似单击，区别在于选中一次之后再选中将不再触发OnSelect事件，除非期间选择了其他控件。 
        /// </summary>
        /// <param name="selected"></param>
        void OnSelect(bool selected)
        {
            if (onSelect != null)
                onSelect(selected);
        }

        public delegate void ScrollDelegate(float delta);
        public event ScrollDelegate onScroll;
        /// <summary>
        /// 鼠标中键滚动时触发，delta为传入的滚动增量。
        /// </summary>
        /// <param name="delta"></param>
        void OnScroll(float delta)
        {
            if (onScroll != null)
                onScroll(delta);
        }

        public delegate void VectorDelegate(Vector2 delta);
        public event VectorDelegate onDrag;
        /// <summary>
        /// 鼠标或触摸按下并移动时触发。delta为传入的位移。
        /// </summary>
        /// <param name="delta"></param>
        void OnDrag(Vector2 delta)
        {
            if (onDrag!=null)
            {
                onDrag(delta);
            }
        }

        public delegate void InputDelegate(string text);
        public event InputDelegate onInput;
        /// <summary>
        /// 只用于输入控件，每次输入完成后触发，text传入本次输入的信息，而非输入控件中的文本信息。
        /// </summary>
        /// <param name="text"></param>
        void OnInput(string text)
        {
            if (onInput != null)
                onInput(text);
        }


        public delegate void DropDelegate(GameObject go);
        public event DropDelegate onDrop;
        /// <summary>
        /// 鼠标OnDrag后移入不同对象释放时触发.go是开始触发OnDrag的对象.
        /// </summary>
        /// <param name="go"></param>
        void OnDrop(GameObject go)
        {
            if (onDrop != null)
                onDrop(go);
        }

        public delegate void KeyCodeDelegate(KeyCode key);
        public event KeyCodeDelegate onKey;
        void OnKey(KeyCode key)
        {
            if (onKey != null)
                onKey(key);
        }

        public delegate void TooltipDelegate(bool show);
        public event TooltipDelegate onTooltip;
        /// <summary>
        /// 鼠标悬停一段时间或移开时触发，悬停时传入true，移开时传入false。
        /// </summary>
        /// <param name="show"></param>
        void OnTooltip(bool show)
        {
            if (onTooltip!=null)
            {
                onTooltip(show);
            }
        }
        
        static public UIEventListener Get(GameObject go)
        {
            UIEventListener listener = go.GetComponent<UIEventListener>();
            if (listener == null) listener = go.AddComponent<UIEventListener>();
            return listener;
        }
    }
}