//--------------------------------------------------------
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// [Author]: 玩个游戏
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// [ Date ]: Wednesday, September 06, 2017
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//--------------------------------------------------------
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using UnityEngine;
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using System.Collections;
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using UnityEngine.UI;
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using System.Collections.Generic;
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using UnityEngine.EventSystems;
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using System;
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/// <summary>
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/// 实现拖拽和缩放功能的组件，支持单指拖拽和双指缩放。
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/// </summary>
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public class BoundedDrag : MonoBehaviour, IEndDragHandler, IBeginDragHandler, IDragHandler
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{
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[SerializeField]
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RectTransform m_Target; // 拖拽的目标对象
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public RectTransform target {
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get { return m_Target; }
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set {
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m_Target = value;
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}
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}
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public RectTransform rectTransform { get { return this.transform as RectTransform; } }
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[SerializeField]
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ScaleRange m_ScaleRange; // 缩放范围
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public ScaleRange scaleRange {
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get { return m_ScaleRange; }
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set { m_ScaleRange = value; }
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}
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[SerializeField]
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float m_DefaultScale; // 默认缩放值
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public float defaultScale { get { return m_DefaultScale; } }
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[SerializeField]
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float m_DestScale = 1f; // 目标缩放值
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public float destScale {
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get { return m_DestScale; }
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set { m_DestScale = Mathf.Clamp(value, scaleRange.min, scaleRange.max); }
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}
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float refScale = 0f; // 用于平滑缩放的参考值
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public float currentScale {
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get {
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return target.localScale.x;
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}
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set {
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target.localScale = Vector3.one * Mathf.Clamp(value, scaleRange.min, scaleRange.max);
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}
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}
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[SerializeField]
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MoveArea m_MoveArea; // 拖拽的边界区域
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public MoveArea moveArea {
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get { return m_MoveArea; }
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set { m_MoveArea = value; }
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}
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[SerializeField]
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Vector2 m_DestPosition = Vector2.zero; // 目标位置
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public Vector2 destPosition {
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get { return m_DestPosition; }
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set { m_DestPosition = new Vector2(Mathf.Clamp(value.x, moveArea.Left * destScale, moveArea.Right * destScale), Mathf.Clamp(value.y, moveArea.Bottom * destScale, moveArea.Top * destScale)); }
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}
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Vector3 refPosition = Vector3.zero; // 用于平滑移动的参考值
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public Vector2 currentPosition {
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get { return target.anchoredPosition; }
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set { target.anchoredPosition = value; }
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}
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Vector2 startTouchPosition01; // 单指拖拽的起始触摸位置
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Vector2 startGroundPosition; // 单指拖拽的起始地面位置
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Vector2 lastTouchPosition01; // 双指缩放的上一帧触摸位置1
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Vector2 curTouchPosition01; // 双指缩放的当前帧触摸位置1
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Vector2 lastTouchPosition02; // 双指缩放的上一帧触摸位置2
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Vector2 curTouchPosition02; // 双指缩放的当前帧触摸位置2
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[SerializeField]
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Action m_OnBeginDrag; // 拖拽开始事件
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public Action onBeginDrag {
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get { return m_OnBeginDrag; }
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}
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bool m_Actionable = true; // 是否可操作
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public bool actionable {
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get { return m_Actionable; }
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set { m_Actionable = value; }
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}
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private void OnEnable()
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{
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destPosition = currentPosition = Vector3.zero; // 初始化位置
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}
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/// <summary>
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/// 拖拽开始事件处理
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/// </summary>
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public void OnBeginDrag(PointerEventData eventData)
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{
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#if UNITY_EDITOR || UNITY_STANDALONE
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if (Input.GetKey(KeyCode.LeftControl) && eventData.button == PointerEventData.InputButton.Left)
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{
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TwoFingerHandleBegin(); // 双指缩放开始
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}
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else if (eventData.button == PointerEventData.InputButton.Left)
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{
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OneFingerHandleBegin(eventData); // 单指拖拽开始
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}
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#else
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if (Input.touchCount == 2) {
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TwoFingerHandleBegin();
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}
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if (Input.touchCount == 1) {
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OneFingerHandleBegin(eventData);
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}
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#endif
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onBeginDrag?.Invoke(); // 触发拖拽开始事件
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}
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/// <summary>
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/// 拖拽过程中的事件处理
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/// </summary>
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public void OnDrag(PointerEventData eventData)
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{
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#if UNITY_EDITOR || UNITY_STANDALONE
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if (Input.GetKey(KeyCode.LeftControl) && eventData.button == PointerEventData.InputButton.Left)
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{
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TwoFingerHandle(); // 双指缩放
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}
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else if (eventData.button == PointerEventData.InputButton.Left)
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{
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OneFingerHandle(eventData); // 单指拖拽
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}
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#else
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if (Input.touchCount == 2) {
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TwoFingerHandle();
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}
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if (Input.touchCount == 1) {
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OneFingerHandle(eventData);
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}
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#endif
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}
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/// <summary>
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/// 拖拽结束事件处理
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/// </summary>
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public void OnEndDrag(PointerEventData eventData)
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{
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}
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/// <summary>
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/// 每帧更新，平滑处理缩放和位置
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/// </summary>
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void LateUpdate()
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{
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if (!actionable)
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{
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return;
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}
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if (Mathf.Abs(currentScale - destScale) > 0.01f)
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{
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float newScale = Mathf.SmoothDamp(currentScale, destScale, ref refScale, 0.15f);
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currentScale = newScale;
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}
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if (Vector2.Distance(currentPosition, destPosition) > 0.1f)
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{
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Vector2 newPosition = Vector3.SmoothDamp(currentPosition, destPosition, ref refPosition, 0.15f);
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currentPosition = newPosition;
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}
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}
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/// <summary>
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/// 单指拖拽开始
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/// </summary>
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private void OneFingerHandleBegin(PointerEventData eventData)
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{
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startTouchPosition01 = Vector2.zero;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, eventData.position, eventData.pressEventCamera, out startTouchPosition01);
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startGroundPosition = currentPosition;
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}
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/// <summary>
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/// 单指拖拽处理
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/// </summary>
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private void OneFingerHandle(PointerEventData eventData)
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{
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Vector2 localMouse;
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, eventData.position, eventData.pressEventCamera, out localMouse))
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{
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var pointerDelta = localMouse - startTouchPosition01;
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destPosition = startGroundPosition + pointerDelta;
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}
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}
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/// <summary>
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/// 双指缩放处理
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/// </summary>
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private void TwoFingerHandle()
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{
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// 方便PC调试逻辑
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#if UNITY_EDITOR || UNITY_STANDALONE
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curTouchPosition01 = new Vector2(Screen.width / 2, Screen.height / 2);
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curTouchPosition02 = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
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#else
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Touch touchFirst = Input.touches[0];
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Touch touchSecond = Input.touches[1];
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curTouchPosition01 = touchFirst.position;
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curTouchPosition02 = touchSecond.position;
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#endif
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float lastLength = Vector2.Distance(lastTouchPosition01, lastTouchPosition02);
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float curLength = Vector2.Distance(curTouchPosition01, curTouchPosition02);
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destScale *= curLength / Mathf.Clamp(lastLength, 1, float.MaxValue);
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lastTouchPosition01 = curTouchPosition01;
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lastTouchPosition02 = curTouchPosition02;
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}
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/// <summary>
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/// 双指缩放开始
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/// </summary>
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private void TwoFingerHandleBegin()
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{
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// 方便PC调试逻辑
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#if UNITY_EDITOR || UNITY_STANDALONE
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curTouchPosition01 = new Vector2(Screen.width / 2, Screen.height / 2);
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curTouchPosition02 = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
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#else
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Touch touchFirst = Input.touches[0];
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Touch touchSecond = Input.touches[1];
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curTouchPosition01 = touchFirst.position;
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curTouchPosition02 = touchSecond.position;
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#endif
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lastTouchPosition01 = curTouchPosition01;
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lastTouchPosition02 = curTouchPosition02;
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}
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/// <summary>
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/// 缩放范围结构体
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/// </summary>
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[Serializable]
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public struct ScaleRange
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{
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public float min; // 最小缩放值
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public float max; // 最大缩放值
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}
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/// <summary>
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/// 拖拽区域结构体
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/// </summary>
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[Serializable]
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public struct MoveArea
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{
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public float Left; // 左边界
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public float Right; // 右边界
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public float Top; // 上边界
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public float Bottom; // 下边界
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public MoveArea(float _left, float _right, float _top, float _bottom)
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{
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this.Left = _left;
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this.Right = _right;
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this.Top = _top;
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this.Bottom = _bottom;
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}
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}
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}
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