（二十一）unity4.6学习Ugui中文文档-------交互-Supported Events & Raycasters

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5.2 Supported Events

Eventsystem支持大量的事件，并且他们可以进一步定制在用户自定义的用户编写的 InputModules中。

支持的StandaloneInputModule和 TouchInputModule的事件提供的接口和所实现的接口可以在 MonoBehaviour中实现。如果你有有效的 EventSystem配置的事件会在正确的时间被调用。

•IPointerEnterHandler - OnPointerEnter -Called when a pointer enters the object

•IPointerExitHandler - OnPointerExit - Calledwhen a pointer exits the object

•IPointerDownHandler - OnPointerDown - Calledwhen a pointer is pressed on the object

•IPointerUpHandler - OnPointerUp - Calledwhen a pointer is released (called on the original the pressed object)

•IPointerClickHandler - OnPointerClick -Called when a pointer is pressed and released on the same object

•IBeginDragHandler - OnBeginDrag - Called onthe drag object when dragging is about to begin

•IDragHandler - OnDrag - Called on the dragobject when a drag is happening

•IEndDragHandler - OnEndDrag - Called on thedrag object when a drag finishes

•IDropHandler - OnDrop - Called on the objectwhere a drag finishes

•IScrollHandler - OnScroll - Called when amouse wheel scrolls

•IUpdateSelectedHandler - OnUpdateSelected -Called on the selected object each tick

•ISelectHandler - OnSelect - Called when theobject becomes the selected object

•IDeselectHandler - OnDeselect - Called onthe selected object becomes deselected

•IMoveHandler - OnMove - Called when a moveevent occurs (left, right, up, down, ect)

•ISubmitHandler - OnSubmit - Called when thesubmit button is pressed

•ICancelHandler - OnCancel - Called when thecancel button is pressed

•IPointerEnterHandler-OnPointerEnter-当pointer指针进入该对象时调用

•IPointerExitHandler-OnPointerExit- pointer指针退出该对象时调用

•IPointerDownHandler-OnPointerDown-当指针在对象上按下时调用

•IPointerUpHandler-OnPointerUp-pointer指针被释放（原状态为被按下）时调用

•IPointerClickHandler-OnPointerClick-pointer指针在同一对象上按下并释放时调用（单击）

•IBeginDragHandler-OnBeginDrag-拖动对象在拖动开始时调用

•IDragHandler-OnDrag-拖动对象，当拖动正在发生进行时调用

•IEndDragHandler-OnEndDrag-拖动对象拖动完成时调用

•IDropHandler-OnDrop-对该对象拖动完成时调用

•IScrollHandler-OnScroll-当鼠标滚轮滚动时调用

•IUpdateSelectedHandler-OnUpdateSelected-在选定的对象上eachtick中调用

•ISelectHandler-OnSelect-当对象成为所选的对象时调用

•IDeselectHandler-OnDeselect-在被选定的对象成为取消被选择时调用

•IMoveHandler-OnMove-移动事件发生时调用（左、右、上、 下等）

•ISubmitHandler-OnSubmit-当按下提交按钮时调用

•ICancelHandler-OnCancel-当按下取消按钮时调用

 

5.3 Raycasters

EventSystem需要一种方法用于检测当前的输入的事件需要发送到什么上，而这由 Raycasters提供的。Raycasters搜索scene返回给定的屏幕的位置上‘most valid’（最有效的）的对象。有几种类型的 Raycasters被提供：

•GraphicRaycaster - Used for UI elements,lives on a Canvas and searches within the canvas

•Physics2DRaycaster - Used for 2D physicselements

•PhysicsRaycaster - Used for 3D physics elements

•GraphicRaycaster-用于 UI 元素，在画布上，画布内搜索

•Physics2DRaycaster-用于为 2D 物理元素

•PhysicsRaycaster-用于为三维物理元素

当一个场景中存在并且启用了Raycaster时，它将被用于EventSystem随时查询InputModule是谁发出的。