unity中 UGUI的按下拖动接口事件的实现
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using UnityEngine; using System.Collections.Generic; using DG.Tweening; using UnityEngine.EventSystems; using UnityEngine.UI; public class testUI : MonoBehaviour, IPointerClickHandler, IPointerDownHandler, IPointerUpHandler, IDragHandler, IEndDragHandler, IPointerEnterHandler, IPointerExitHandler { //private GraphicRaycaster graphicRaycaster; //private EventSystem eventSystem; //private RectTransform Image; public RectTransform canvas; //得到canvas的ugui坐标 private RectTransform imgRect; //得到图片的ugui坐标 Vector2 offset = new Vector3(); //用来得到鼠标和图片的差值 Vector3 imgReduceScale = new Vector3(0.7f, 0.7f, 1); //设置图片缩放 Vector3 imgNormalScale = new Vector3(1, 1, 1); //正常大小 void Start() { //graphicRaycaster = GameObject.Find("Canvas").GetComponent<GraphicRaycaster>(); //eventSystem = GameObject.Find("EventSystem").GetComponent<EventSystem>(); //Image = GameObject.Find("Canvas/Image").GetComponent<RectTransform>(); //SetRectTransformSize(Image, new Vector2(2, 2)); imgRect = GetComponent<RectTransform>(); } // Update is called once per frame void Update() { //if (CheckGuiRaycastObjects()) return; //Debug.Log(EventSystem.current.gameObject.name); //if (Input.GetMouseButtonDown(0)) //{ // if (EventSystem.current.IsPointerOverGameObject()) // { // Debug.Log("当前触摸在UI上"); // Debug.LogError(EventSystem.current.IsPointerOverGameObject()); // } // else // Debug.Log("当前没有触摸在UI上"); //} } bool CheckGuiRaycastObjects() { PointerEventData eventData = new PointerEventData(eventSystem); eventData.pressPosition = Input.mousePosition; eventData.position = Input.mousePosition; List<RaycastResult> list = new List<RaycastResult>(); graphicRaycaster.GetComponent<GraphicRaycaster>().Raycast(eventData, list); Debug.Log(list.Count); return list.Count > 0; } public void OnPointerClick(PointerEventData eventData) { //if (eventData.clickCount == 2) //{ // this.transform.DOScale(new Vector3(1.5f, 1.5f, 1.5f), 0.5f); //} //if (eventData.clickCount == 1) //{ // this.transform.DOScale(Vector3.one, 0.5f); //} } private void SetInsetAndSizeFromParentEdge(GameObject obj) { var rt = obj.gameObject.GetComponent<RectTransform>(); rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Right, 0, 100); rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Bottom, 0, 30); } public static void SetRectTransformSize(RectTransform trans, Vector2 newSize) { Vector2 oldSize = trans.rect.size; Vector2 deltaSize = newSize - oldSize; trans.offsetMin = trans.offsetMin - new Vector2(deltaSize.x * trans.pivot.x, deltaSize.y * trans.pivot.y); trans.offsetMax = trans.offsetMax + new Vector2(deltaSize.x * (1f - trans.pivot.x), deltaSize.y * (1f - trans.pivot.y)); } //当鼠标按下时调用 接口对应 IPointerDownHandler public void OnPointerDown(PointerEventData eventData) { Vector2 mouseDown = eventData.position; //记录鼠标按下时的屏幕坐标 Vector2 mouseUguiPos = new Vector2(); //定义一个接收返回的ugui坐标 //RectTransformUtility.ScreenPointToLocalPointInRectangle():把屏幕坐标转化成ugui坐标 //canvas:坐标要转换到哪一个物体上,这里img父类是Canvas,我们就用Canvas //eventData.enterEventCamera:这个事件是由哪个摄像机执行的 //out mouseUguiPos:返回转换后的ugui坐标 //isRect:方法返回一个bool值,判断鼠标按下的点是否在要转换的物体上 bool isRect = RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas, mouseDown, eventData.enterEventCamera, out mouseUguiPos); if (isRect) //如果在 { //计算图片中心和鼠标点的差值 offset = imgRect.anchoredPosition - mouseUguiPos; } } //当鼠标抬起时调用 对应接口 IPointerUpHandler public void OnPointerUp(PointerEventData eventData) { //offset = Vector2.zero; } //当鼠标拖动时调用 对应接口 IDragHandler public void OnDrag(PointerEventData eventData) { Vector2 mouseDrag = eventData.position; //当鼠标拖动时的屏幕坐标 Vector2 uguiPos = new Vector2(); //用来接收转换后的拖动坐标 //和上面类似 bool isRect = RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas, mouseDrag, eventData.enterEventCamera, out uguiPos); if (isRect) { //设置图片的ugui坐标与鼠标的ugui坐标保持不变 imgRect.anchoredPosition = offset + uguiPos; } } //当鼠标结束拖动时调用 对应接口 IEndDragHandler public void OnEndDrag(PointerEventData eventData) { //offset = Vector2.zero; } //当鼠标进入图片时调用 对应接口 IPointerEnterHandler public void OnPointerEnter(PointerEventData eventData) { //imgRect.localScale = imgReduceScale; //缩小图片 } //当鼠标退出图片时调用 对应接口 IPointerExitHandler public void OnPointerExit(PointerEventData eventData) { //imgRect.localScale = imgNormalScale; //回复图片 } }
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