//--------------------------------------------------------
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// [Author]: 第二世界
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// [ Date ]: Monday, September 11, 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 UnityEngine.EventSystems;
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using System;
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public class FlipScroll : MaskableGraphic, IBeginDragHandler, IEndDragHandler, IDragHandler
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{
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public enum FlipDirEnum
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{
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Horizon,
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Vertical,
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}
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private int page = 0;
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/// <summary>
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/// 当前页
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/// </summary>
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public int Page {
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get { return page; }
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}
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[SerializeField]
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private FlipDirEnum flipType = FlipDirEnum.Horizon;
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public FlipDirEnum FlipType {
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get {
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return flipType;
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}
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set {
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flipType = value;
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}
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}
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[SerializeField]
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private bool m_Loop = false;
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public bool loop {
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get {
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return m_Loop;
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}
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set {
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m_Loop = value;
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}
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}
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[SerializeField]
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private TweenType _tweenType = TweenType.Linear;
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public TweenType tweenType {
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get { return _tweenType; }
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set { _tweenType = value; }
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}
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[SerializeField]
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private float sensitive = 5.0f;
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public float Sensitive {
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get { return sensitive; }
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set { sensitive = value; }
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}
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[SerializeField]
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public bool resetOnEnable = true;
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private bool tweening = false;
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public bool IsTweening { get { return tweening; } }
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[SerializeField]
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private float _tweenTime = 1.0f;
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public float TweenTime {
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get { return _tweenTime; }
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set { _tweenTime = value; }
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}
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public RectTransform presentRT;
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public RectTransform lastRT;
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private RectTransform presentFlipRT;
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private RectTransform lastFlipRT;
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public event Action<int, RectTransform> OnRefreshData;
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public event Action OnTweenCompt;
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public int pageCnt = 0;
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[HideInInspector]
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public bool locked = false;
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protected override void Awake()
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{
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base.Awake();
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if (presentRT == null || lastRT == null) return;
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presentRT.SetActive(false);
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lastRT.SetActive(false);
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presentFlipRT = presentRT;
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lastFlipRT = lastRT;
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}
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protected override void OnEnable()
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{
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base.OnEnable();
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if (presentRT == null || lastRT == null || pageCnt == 0) return;
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presentRT.SetActive(true);
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lastRT.SetActive(true);
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presentRT.localPosition = Vector3.zero;
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if (resetOnEnable) {
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switch (FlipType) {
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case FlipDirEnum.Horizon:
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lastRT.localPosition = rectTransform.localPosition.SetX(rectTransform.sizeDelta.x);
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break;
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case FlipDirEnum.Vertical:
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lastRT.localPosition = rectTransform.localPosition.SetY(-rectTransform.sizeDelta.y);
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break;
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}
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page = 0;
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}
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presentFlipRT = presentRT;
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lastFlipRT = lastRT;
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RefreshActive();
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}
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private Vector2 lastPos = Vector2.zero;
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public void OnBeginDrag(PointerEventData eventData)
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{
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lastPos = eventData.position;
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}
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public void OnEndDrag(PointerEventData eventData)
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{
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if (IsTweening || locked) return;
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Vector2 nPos = lastPos - eventData.position;
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switch (FlipType) {
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case FlipDirEnum.Horizon: {
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if (Math.Abs(nPos.x) < sensitive) return;
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if (nPos.x > 0) {
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FlipRight();
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}
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else {
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FlipLeft();
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}
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}
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break;
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case FlipDirEnum.Vertical: {
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if (Math.Abs(nPos.y) < sensitive) return;
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Vector3 pos = Vector3.zero;
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if (nPos.y < 0) {
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FlipLeft();
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}
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else {
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FlipRight();
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}
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}
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break;
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}
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}
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protected override void OnDisable()
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{
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tweening = false;
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StopAllCoroutines();
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base.OnDisable();
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}
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IEnumerator TweenPosition(Vector3 lPos, Vector3 nPos, Vector3 lastRtPos)
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{
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float time = 0;
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Vector3 newPresentPos = Vector3.zero;
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Vector3 newLastPos = Vector3.zero;
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bool InView = false;
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tweening = true;
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while (time < _tweenTime) {
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float per = 0;
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switch (tweenType) {
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case TweenType.Immediate: per = 1; break;
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case TweenType.Linear: per = Linear(time / _tweenTime); break;
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case TweenType.Smooth: per = Smooth(time / _tweenTime); break;
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}
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newPresentPos = Vector3.Lerp(lPos, nPos, per);
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newLastPos = Vector3.Lerp(lastRtPos, Vector3.zero, per);
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presentFlipRT.localPosition = newPresentPos;
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lastFlipRT.localPosition = newLastPos;
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time += Time.unscaledDeltaTime;
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if (!InView) {
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InView = InViewSide();
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}
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if (tweenType == TweenType.Immediate) {
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break;
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}
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yield return null;
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}
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tweening = false;
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presentFlipRT.localPosition = nPos;
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lastFlipRT.localPosition = Vector3.zero;
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RectTransform temp = presentFlipRT;
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presentFlipRT = lastFlipRT;
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lastFlipRT = temp;
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if (OnTweenCompt != null) OnTweenCompt();
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}
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public bool InViewSide()
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{
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switch (FlipType) {
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case FlipDirEnum.Horizon: {
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if (Vector3.Distance(Vector3.zero, lastFlipRT.localPosition) < lastFlipRT.sizeDelta.x + rectTransform.sizeDelta.x) {
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if (OnRefreshData != null) {
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lastFlipRT.SetActive(true);
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OnRefreshData(page, lastFlipRT);
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}
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return true;
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}
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}
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break;
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case FlipDirEnum.Vertical: {
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if (Vector3.Distance(Vector3.zero, lastFlipRT.localPosition) < lastFlipRT.sizeDelta.y + rectTransform.sizeDelta.y) {
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if (OnRefreshData != null) {
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lastFlipRT.SetActive(true);
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OnRefreshData(page, lastFlipRT);
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}
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return true;
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}
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}
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break;
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}
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return false;
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}
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private float Linear(float val)
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{
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return Mathf.Lerp(0, 1, val);
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}
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private float Smooth(float val)
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{
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float result = Mathf.SmoothStep(0, 1, val);
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result = Mathf.Clamp(result, 0, 1);
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return result;
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}
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public void RefreshActive()
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{
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if (pageCnt == 0 || presentFlipRT == null) return;
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if (OnRefreshData != null) {
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presentFlipRT.SetActive(true);
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OnRefreshData(page, presentFlipRT);
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}
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}
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public void FlipLeft()
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{
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if (IsTweening || pageCnt == 0) return;
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Vector3 pos = Vector3.zero;
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page--;
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if (page < 0) {
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if (loop) {
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page = pageCnt - 1;
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}
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else {
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page = 0;
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return;
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}
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}
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switch (FlipType) {
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case FlipDirEnum.Horizon: {
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lastFlipRT.localPosition = rectTransform.localPosition.SetX(-rectTransform.sizeDelta.x);
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pos = rectTransform.localPosition.SetX(rectTransform.sizeDelta.x);
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}
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break;
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case FlipDirEnum.Vertical: {
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lastFlipRT.localPosition = rectTransform.localPosition.SetY(rectTransform.sizeDelta.y);
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pos = rectTransform.localPosition.SetY(-rectTransform.sizeDelta.y);
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}
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break;
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}
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StartCoroutine(TweenPosition(presentFlipRT.localPosition, pos, lastFlipRT.localPosition));
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}
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public void FlipRight()
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{
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if (IsTweening || pageCnt == 0) return;
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Vector3 pos = Vector3.zero;
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page++;
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if (page >= pageCnt) {
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if (loop) {
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page = 0;
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}
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else {
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page = pageCnt - 1;
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return;
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}
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}
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switch (FlipType) {
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case FlipDirEnum.Horizon: {
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lastFlipRT.localPosition = rectTransform.localPosition.SetX(rectTransform.sizeDelta.x);
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pos = rectTransform.localPosition.SetX(-rectTransform.sizeDelta.x);
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}
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break;
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case FlipDirEnum.Vertical: {
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lastFlipRT.localPosition = rectTransform.localPosition.SetY(-rectTransform.sizeDelta.y);
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pos = rectTransform.localPosition.SetY(rectTransform.sizeDelta.y);
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}
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break;
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}
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StartCoroutine(TweenPosition(presentFlipRT.localPosition, pos, lastFlipRT.localPosition));
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}
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public void OnDrag(PointerEventData eventData)
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{
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}
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public enum TweenType
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{
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Immediate,
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Linear,
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Smooth,
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}
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}
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