101 lines
2.7 KiB
JavaScript
101 lines
2.7 KiB
JavaScript
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var easingFuncs = require("./easing");
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/**
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* 动画主控制器
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* @config target 动画对象，可以是数组，如果是数组的话会批量分发onframe等事件
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* @config life(1000) 动画时长
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* @config delay(0) 动画延迟时间
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* @config loop(true)
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* @config gap(0) 循环的间隔时间
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* @config onframe
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* @config easing(optional)
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* @config ondestroy(optional)
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* @config onrestart(optional)
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*
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* TODO pause
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*/
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function Clip(options) {
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this._target = options.target; // 生命周期
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this._life = options.life || 1000; // 延时
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this._delay = options.delay || 0; // 开始时间
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// this._startTime = new Date().getTime() + this._delay;// 单位毫秒
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this._initialized = false; // 是否循环
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this.loop = options.loop == null ? false : options.loop;
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this.gap = options.gap || 0;
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this.easing = options.easing || 'Linear';
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this.onframe = options.onframe;
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this.ondestroy = options.ondestroy;
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this.onrestart = options.onrestart;
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this._pausedTime = 0;
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this._paused = false;
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}
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Clip.prototype = {
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constructor: Clip,
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step: function (globalTime, deltaTime) {
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// Set startTime on first step, or _startTime may has milleseconds different between clips
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// PENDING
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if (!this._initialized) {
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this._startTime = globalTime + this._delay;
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this._initialized = true;
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}
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if (this._paused) {
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this._pausedTime += deltaTime;
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return;
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}
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var percent = (globalTime - this._startTime - this._pausedTime) / this._life; // 还没开始
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if (percent < 0) {
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return;
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}
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percent = Math.min(percent, 1);
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var easing = this.easing;
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var easingFunc = typeof easing === 'string' ? easingFuncs[easing] : easing;
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var schedule = typeof easingFunc === 'function' ? easingFunc(percent) : percent;
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this.fire('frame', schedule); // 结束
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if (percent === 1) {
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if (this.loop) {
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this.restart(globalTime); // 重新开始周期
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// 抛出而不是直接调用事件直到 stage.update 后再统一调用这些事件
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return 'restart';
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} // 动画完成将这个控制器标识为待删除
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// 在Animation.update中进行批量删除
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this._needsRemove = true;
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return 'destroy';
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}
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return null;
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},
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restart: function (globalTime) {
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var remainder = (globalTime - this._startTime - this._pausedTime) % this._life;
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this._startTime = globalTime - remainder + this.gap;
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this._pausedTime = 0;
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this._needsRemove = false;
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},
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fire: function (eventType, arg) {
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eventType = 'on' + eventType;
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if (this[eventType]) {
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this[eventType](this._target, arg);
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}
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},
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pause: function () {
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this._paused = true;
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},
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resume: function () {
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this._paused = false;
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}
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};
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var _default = Clip;
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module.exports = _default;
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