319 lines
11 KiB
TypeScript
319 lines
11 KiB
TypeScript
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module es {
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export enum LoopType {
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none,
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restartFromBeginning,
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pingpong
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}
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export enum TweenState {
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running,
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paused,
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complete
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}
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export abstract class Tween<T> implements ITweenable, ITween<T> {
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protected _target: ITweenTarget<T>;
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protected _isFromValueOverridden: boolean;
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protected _fromValue: T;
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protected _toValue: T;
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protected _easeType: EaseType;
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protected _shouldRecycleTween: boolean = true;
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protected _isRelative: boolean;
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protected _completionHandler: (tween: ITween<T>) => void;
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protected _loopCompleteHandler: (tween: ITween<T>) => void;
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protected _nextTween: ITweenable;
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protected _tweenState: TweenState = TweenState.complete;
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private _isTimeScaleIndependent: boolean;
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protected _delay: number;
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protected _duration: number;
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protected _timeScale: number = 1;
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protected _elapsedTime: number;
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protected _loopType: LoopType;
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protected _loops: number;
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protected _delayBetweenLoops: number;
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private _isRunningInReverse: boolean;
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public context: any;
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public setEaseType(easeType: EaseType): ITween<T> {
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this._easeType = easeType;
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return this;
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}
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public setDelay(delay: number): ITween<T> {
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this._delay = delay;
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this._elapsedTime = -this._delay;
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return this;
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}
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public setDuration(duration: number): ITween<T> {
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this._duration = duration;
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return this;
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}
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public setTimeScale(timeSclae: number): ITween<T> {
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this._timeScale = timeSclae;
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return this;
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}
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public setIsTimeScaleIndependent(): ITween<T> {
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this._isTimeScaleIndependent = true;
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return this;
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}
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public setCompletionHandler(completeHandler: (tween: ITween<T>) => void): ITween<T> {
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this._completionHandler = completeHandler;
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return this;
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}
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public setLoops(loopType: LoopType, loops: number = 1, delayBetweenLoops: number = 0): ITween<T> {
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this._loopType = loopType;
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this._delayBetweenLoops = delayBetweenLoops;
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if (loops < 0)
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loops = -1;
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if (loopType == LoopType.pingpong)
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loops = loops * 2;
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this._loops = loops;
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return this;
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}
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public setLoopCompletionHanlder(loopCompleteHandler: (tween: ITween<T>) => void): ITween<T> {
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this._loopCompleteHandler = loopCompleteHandler;
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return this;
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}
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public setFrom(from: T): ITween<T> {
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this._isFromValueOverridden = true;
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this._fromValue = from;
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return this;
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}
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public prepareForReuse(from: T, to: T, duration: number): ITween<T> {
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this.initialize(this._target, to, duration);
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return this;
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}
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public setRecycleTween(shouldRecycleTween: boolean): ITween<T> {
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this._shouldRecycleTween = shouldRecycleTween;
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return this;
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}
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public abstract setIsRelative(): ITween<T>;
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public setContext(context): ITween<T> {
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this.context = context;
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return this;
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}
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public setNextTween(nextTween: ITweenable): ITween<T> {
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this._nextTween = nextTween;
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return this;
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}
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public tick(): boolean {
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if (this._tweenState == TweenState.paused)
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return false;
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// 当我们进行循环时，我们会在0和持续时间之间限制数值
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let elapsedTimeExcess = 0;
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if (!this._isRunningInReverse && this._elapsedTime >= this._duration) {
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elapsedTimeExcess = this._elapsedTime - this._duration;
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this._elapsedTime = this._duration;
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this._tweenState = TweenState.complete;
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} else if (this._isRunningInReverse && this._elapsedTime <= 0) {
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elapsedTimeExcess = 0 - this._elapsedTime;
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this._elapsedTime = 0;
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this._tweenState = TweenState.complete;
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}
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// 当我们延迟开始tween的时候，经过的时间会是负数，所以不要更新这个值。
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if (this._elapsedTime >= 0 && this._elapsedTime <= this._duration) {
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this.updateValue();
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}
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// 如果我们有一个loopType，并且我们是Complete（意味着我们达到了0或持续时间）处理循环。
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// handleLooping将采取任何多余的elapsedTime，并将其因子化，并在必要时调用udpateValue来保持tween的完美准确性
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if (this._loopType != LoopType.none && this._tweenState == TweenState.complete && this._loops != 0) {
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this.handleLooping(elapsedTimeExcess);
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}
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let deltaTime = this._isTimeScaleIndependent ? Time.unscaledDeltaTime : Time.deltaTime;
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deltaTime *= this._timeScale;
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// 我们需要减去deltaTime
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if (this._isRunningInReverse)
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this._elapsedTime -= deltaTime;
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else
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this._elapsedTime += deltaTime;
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if (this._tweenState == TweenState.complete) {
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this._completionHandler && this._completionHandler(this);
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// 如果我们有一个nextTween，把它添加到TweenManager中，这样它就可以开始运行了
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if (this._nextTween != null) {
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this._nextTween.start();
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this._nextTween = null;
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}
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return true;
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}
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return false;
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}
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public recycleSelf() {
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if (this._shouldRecycleTween) {
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this._target = null;
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this._nextTween = null;
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}
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}
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public isRunning(): boolean {
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return this._tweenState == TweenState.running;
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}
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public start() {
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if (!this._isFromValueOverridden)
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this._fromValue = this._target.getTargetObject();
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if (this._tweenState == TweenState.complete) {
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this._tweenState = TweenState.running;
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TweenManager.addTween(this);
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}
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}
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public pause() {
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this._tweenState = TweenState.paused;
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}
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public resume() {
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this._tweenState = TweenState.running;
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}
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public stop(bringToCompletion: boolean = false) {
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this._tweenState = TweenState.complete;
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if (bringToCompletion) {
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// 如果我们逆向运行，我们在0处结束，否则我们进入持续时间
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this._elapsedTime = this._isRunningInReverse ? 0 : this._duration;
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this._loopType = LoopType.none;
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this._loops = 0;
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// TweenManager将在下一个tick上进行删除处理
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} else {
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TweenManager.removeTween(this);
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}
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}
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public jumpToElapsedTime(elapsedTime) {
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this._elapsedTime = MathHelper.clamp(elapsedTime, 0, this._duration);
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this.updateValue();
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}
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/**
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* 反转当前的tween，如果是向前走，就会向后走，反之亦然
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*/
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public reverseTween() {
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this._isRunningInReverse = !this._isRunningInReverse;
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}
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/**
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* 当通过StartCoroutine调用时，这将一直持续到tween完成
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*/
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public * waitForCompletion() {
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while (this._tweenState != TweenState.complete)
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yield null;
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}
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public getTargetObject() {
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return this._target.getTargetObject();
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}
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private resetState() {
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this.context = null;
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this._completionHandler = this._loopCompleteHandler = null;
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this._isFromValueOverridden = false;
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this._isTimeScaleIndependent = false;
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this._tweenState = TweenState.complete;
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// TODO: 我认为在没有得到用户同意的情况下，我们绝对不应该从_shouldRecycleTween=false。需要研究和思考
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// this._shouldRecycleTween = true;
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this._isRelative = false;
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this._easeType = TweenManager.defaultEaseType;
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if (this._nextTween != null) {
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this._nextTween.recycleSelf();
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this._nextTween = null;
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}
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this._delay = 0;
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this._duration = 0;
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this._timeScale = 1;
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this._elapsedTime = 0;
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this._loopType = LoopType.none;
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this._delayBetweenLoops = 0;
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this._loops = 0;
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this._isRunningInReverse = false;
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}
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/**
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* 将所有状态重置为默认值，并根据传入的参数设置初始状态。
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* 这个方法作为一个切入点，这样Tween子类就可以调用它，这样tweens就可以被回收。
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* 当回收时，构造函数不会再被调用，所以这个方法封装了构造函数要做的事情
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* @param target
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* @param to
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* @param duration
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*/
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public initialize(target: ITweenTarget<T>, to: T, duration: number) {
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// 重置状态，以防我们被回收
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this.resetState();
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this._target = target;
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this._toValue = to;
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this._duration = duration;
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}
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/**
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* 处理循环逻辑
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* @param elapsedTimeExcess
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*/
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private handleLooping(elapsedTimeExcess: number) {
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this._loops--;
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if (this._loopType == LoopType.pingpong) {
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this.reverseTween();
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}
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if (this._loopType == LoopType.restartFromBeginning || this._loops % 2 == 0) {
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this._loopCompleteHandler && this._completionHandler(this);
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}
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// 如果我们还有循环要处理，就把我们的状态重置为Running，这样我们就可以继续处理它们了
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if (this._loops != 0) {
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this._tweenState = TweenState.running;
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// 现在，我们需要设置我们的经过时间，并考虑到我们的elapsedTimeExcess
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if (this._loopType == LoopType.restartFromBeginning) {
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this._elapsedTime = elapsedTimeExcess - this._delayBetweenLoops;
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} else {
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if (this._isRunningInReverse)
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this._elapsedTime += this._delayBetweenLoops - elapsedTimeExcess;
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else
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this._elapsedTime = elapsedTimeExcess - this._delayBetweenLoops;
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}
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// 如果我们有一个elapsedTimeExcess，并且没有delayBetweenLoops，则更新该值
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if (this._delayBetweenLoops == 0 && elapsedTimeExcess > 0) {
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this.updateValue();
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}
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}
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}
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protected abstract updateValue();
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}
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}
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