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// by chai
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
namespace TweenAnimation
{
// tween播放过程中产生事件
[Serializable]
public class TweenEvent
{
public string name; // 事件名
public float time; // 事件触发时间
public UnityEvent eventHandler; // 回调函数
#if UNITY_EDITOR
[NonSerialized]
public bool unfold = false;
#endif
[NonSerialized]
public bool trigged = false;
public TweenEvent()
{
name = "New Event";
time = 0;
eventHandler = null;
}
}
public class TweenAnimation : MonoBehaviour
{
public enum EventTriggeredDirection
{
None = 0,
Forward = 1,
Backward = 2,
}
public enum PlaybackStyle
{
Once,
Loop,
PingPong,
}
public new string name = "New Animation";
[SerializeReference]
public List<TweenModule> modules;
public float duration;
public PlaybackStyle playbackStyle;
public EventTriggeredDirection eventTriggeredDirection;
// 回放次数，0是不限制，默认是0
public int playbackLimit;
// 是否触发事件
public bool triggerEvents;
// 只触发一次事件
public bool triggerOnce;
// 脚本中处理 ITweenEventHandler
public bool scriptHandler;
public List<TweenEvent> eventList;
// 默认的事件回调函数
public UnityEvent onStart;
public UnityEvent onTurnStart;
public UnityEvent onTurnEnd;
public UnityEvent onEnd;
// 上次更新时的时间（一个turn内的）
private float m_LastPlaybackTurnTime;
public TweenAnimation()
{
this.playbackStyle = PlaybackStyle.Loop;
this.playbackLimit = 0;
this.duration = 1;
this.modules = new List<TweenModule>();
this.triggerOnce = false;
m_LastPlaybackTurnTime = -0.001f;
}
public void AddModule(TweenModule module)
{
if (modules == null)
modules = new List<TweenModule>();
modules.Add(module);
}
public void RemoveModule(TweenModule module)
{
if (modules == null)
return;
if (modules.Contains(module))
modules.Remove(module);
}
public void AddEvent(TweenEvent e)
{
if (eventList == null)
eventList = new List<TweenEvent>();
eventList.Add(e);
}
public void RemoveEvent(TweenEvent e)
{
if (eventList == null)
return;
eventList.Remove(e);
}
public void BeforePlay()
{
m_LastPlaybackTurnTime = -0.001f;
ResetEventTriggerFlag();
}
private void ResetEventTriggerFlag()
{
for(int i = 0; i < eventList.Count; ++i)
{
var e = eventList[i];
if (e == null)
continue;
e.trigged = false;
}
}
/// <summary>
/// 根据时间执行tween, time是从播放开始的真实时间
/// </summary>
/// <param name="time">real time</param>
public void Process(float time)
{
if (modules == null)
return;
float limitTime = ApplyLimit(time); // 转换为playback limit后的逻辑时间
float logicTime = HandleTime(limitTime); // 转换为1个turn内的逻辑时间
// 处理事件
if(triggerEvents)
{
if (limitTime >= 0 && m_LastPlaybackTurnTime < 0)
onStart.Invoke();
bool isPingpong = playbackStyle == PlaybackStyle.PingPong;
for (int i = 0; i < eventList.Count; ++i)
{
var e = eventList[i];
if (e == null)
continue;
if (triggerOnce && e.trigged)
continue;
float t = e.time;
bool bTrigger = false;
bool isOdd = (((int)(limitTime / duration)) & 1) == 1;
if (isPingpong && isOdd && (eventTriggeredDirection & EventTriggeredDirection.Backward) == 0)
continue;
if (isPingpong && !isOdd && (eventTriggeredDirection & EventTriggeredDirection.Forward) == 0)
continue;
if (isPingpong && isOdd)
bTrigger = logicTime <= t && m_LastPlaybackTurnTime > t;
else
bTrigger = logicTime >= t && m_LastPlaybackTurnTime < t;
if(bTrigger && e.eventHandler != null)
{
e.eventHandler.Invoke();
if (triggerOnce)
e.trigged = true;
}
}
m_LastPlaybackTurnTime = logicTime;
}
// 更新动画
for (int i = 0; i < modules.Count; i ++)
{
TweenModule module = modules[i];
if (!module.enabled)
continue;
module.OnUpdate(logicTime);
}
}
float HandleOnce(float time)
{
time = Mathf.Clamp(time, 0, duration);
return time;
}
float HandleLoop(float time)
{
time = time % duration;
return time;
}
float HandlePingpong(float time)
{
if (time <= duration)
return time;
float remain = time % duration;
int round = (int)(time / duration);
bool bOdd = (round & 1) == 1;
if (bOdd)
time = duration - remain;
else
time = remain;
return time;
}
// 返回[0,duration]范围内的逻辑时间
public float HandleTime(float time)
{
float logicTime = time;
if (this.playbackStyle == PlaybackStyle.Once)
logicTime = HandleOnce(time);
else if (this.playbackStyle == PlaybackStyle.Loop)
logicTime = HandleLoop(time);
else if (this.playbackStyle == PlaybackStyle.PingPong)
logicTime = HandlePingpong(time);
return logicTime;
}
// 返回真实时间对应的逻辑时间
public float ApplyLimit(float time)
{
if (playbackLimit <= 0)
return time;
if (playbackStyle == PlaybackStyle.Loop)
time = Mathf.Clamp(time, 0, playbackLimit * duration - 0.001f); // 0.001是为了防止HandleTime的mod等于0
else if(playbackStyle == PlaybackStyle.PingPong)
time = Mathf.Clamp(time, 0, playbackLimit * duration);
return time;
}
#if UNITY_EDITOR
public void UpdateEditor(float time)
{
Process(time);
}
// 返回0-duration内的时间，用负数代表从右往左
public float GetIdentifiedTime(float t)
{
int round = (int)(t / duration);
float time = HandleTime(t);
if(playbackStyle == PlaybackStyle.PingPong)
{
bool bOdd = (round & 1) == 1;
if(bOdd)
time = -time;
}
return time;
}
#endif
}
}
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