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* 动画类 - 用于处理不适合使用 transition 的动画场景
*
* 可绑定的事件
* - start 动画开始时触发
* - complete 动画已完成
* - stop 动画尚未完成就被中断
* - cancel 动画被取消
* @class fx/Fx
* @see [mootools/Fx](https://mootools.net/core/docs/1.6.0/Fx/Fx)
* @constructor
* @param {Object} [options] 动画选项
* @param {Number} [options.fps=60] 帧速率(f/s)，实际上动画运行的最高帧速率不会高于 requestAnimationFrame 提供的帧速率
* @param {Number} [options.duration=500] 动画持续时间(ms)
* @param {String|Function} [options.transition] 动画执行方式，参见 [fx/transitions](#fx-transitions)
* @param {Number} [options.frames] 从哪一帧开始执行
* @param {Boolean} [options.frameSkip=true] 是否跳帧
* @param {String} [options.link='ignore'] 动画衔接方式，可选：['ignore', 'cancel']
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx({
* duration : 1000
* });
* fx.set = function (now) {
* node.style.marginLeft = now + 'px';
* };
* fx.on('complete', function(){
* console.info('animation end');
* });
* fx.start(0, 600); // 1秒内数字从0增加到600
*/
var $klass = require('../mvc/klass');
var $events = require('../evt/events');
var $erase = require('../arr/erase');
var $contains = require('../arr/contains');
var $assign = require('../obj/assign');
var $timer = require('./timer');
// global timers
// 使用公共定时器可以减少浏览器资源消耗
var instances = {};
var timers = {};
var loop = function () {
var now = Date.now();
for (var i = this.length; i >= 0; i -= 1) {
var instance = this[i];
if (instance) {
instance.step(now);
}
}
};
var pushInstance = function (fps) {
var list = instances[fps] || (instances[fps] = []);
list.push(this);
Eif (!timers[fps]) {
var loopMethod = loop.bind(list);
var loopDur = Math.round(1000 / fps);
timers[fps] = $timer.setInterval(loopMethod, loopDur);
}
};
var pullInstance = function (fps) {
var list = instances[fps];
Eif (list) {
$erase(list, this);
Eif (!list.length && timers[fps]) {
delete instances[fps];
timers[fps] = $timer.clearInterval(timers[fps]);
}
}
};
var Fx = $klass({
initialize: function (options) {
this.options = $assign({
fps: 60,
duration: 500,
transition: null,
frames: null,
frameSkip: true,
link: 'ignore',
}, options);
},
/**
* 设置实例的选项
* @method Fx#setOptions
* @memberof fx/Fx
* @param {Object} options 动画选项
*/
setOptions: function (options) {
this.conf = $assign({}, this.options, options);
},
/**
* 设置动画的执行方式，配置缓动效果
* @interface Fx#getTransition
* @memberof fx/Fx
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx();
* fx.getTransition = function () {
* return function (p) {
* return -(Math.cos(Math.PI * p) - 1) / 2;
* };
* };
*/
getTransition: function () {
return function (p) {
return -(Math.cos(Math.PI * p) - 1) / 2;
};
},
step: function (now) {
Eif (this.options.frameSkip) {
var diff = this.time != null ? now - this.time : 0;
var frames = diff / this.frameInterval;
this.time = now;
this.frame += frames;
} else {
this.frame += 1;
}
if (this.frame < this.frames) {
var delta = this.transition(this.frame / this.frames);
this.set(this.compute(this.from, this.to, delta));
} else {
this.frame = this.frames;
this.set(this.compute(this.from, this.to, 1));
this.stop();
}
},
/**
* 设置当前动画帧的过渡数值
* @interface Fx#set
* @memberof fx/Fx
* @param {Number} now 当前动画帧的过渡数值
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx();
* fx.set = function (now) {
* node.style.marginLeft = now + 'px';
* };
*/
set: function (now) {
return now;
},
compute: function (from, to, delta) {
return Fx.compute(from, to, delta);
},
check: function () {
if (!this.isRunning()) {
return true;
}
if (this.options.link === 'cancel') {
this.cancel();
return true;
}
return false;
},
/**
* 开始执行动画
* @method Fx#start
* @memberof fx/Fx
* @param {Number} from 动画开始数值
* @param {Number} to 动画结束数值
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx();
* fx.start(); // 开始动画
*/
start: function (from, to) {
if (!this.check(from, to)) {
return this;
}
this.from = from;
this.to = to;
this.frame = this.options.frameSkip ? 0 : -1;
this.time = null;
this.transition = this.getTransition();
var frames = this.options.frames;
var fps = this.options.fps;
var duration = this.options.duration;
this.duration = Fx.Durations[duration] || parseInt(duration, 10) || 0;
this.frameInterval = 1000 / fps;
this.frames = frames || Math.round(this.duration / this.frameInterval);
this.trigger('start');
pushInstance.call(this, fps);
return this;
},
/**
* 停止动画
* @method Fx#stop
* @memberof fx/Fx
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx();
* fx.start();
* fx.stop(); // 立刻停止动画
*/
stop: function () {
Eif (this.isRunning()) {
this.time = null;
pullInstance.call(this, this.options.fps);
if (this.frames === this.frame) {
this.trigger('complete');
} else {
this.trigger('stop');
}
}
return this;
},
/**
* 取消动画
* @method Fx#cancel
* @memberof fx/Fx
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx();
* fx.start();
* fx.cancel(); // 立刻取消动画
*/
cancel: function () {
Eif (this.isRunning()) {
this.time = null;
pullInstance.call(this, this.options.fps);
this.frame = this.frames;
this.trigger('cancel');
}
return this;
},
/**
* 暂停动画
* @method Fx#pause
* @memberof fx/Fx
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx();
* fx.start();
* fx.pause(); // 立刻暂停动画
*/
pause: function () {
Eif (this.isRunning()) {
this.time = null;
pullInstance.call(this, this.options.fps);
}
return this;
},
/**
* 继续执行动画
* @method Fx#resume
* @memberof fx/Fx
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx();
* fx.start();
* fx.pause();
* fx.resume(); // 立刻继续动画
*/
resume: function () {
Eif (this.frame < this.frames && !this.isRunning()) {
pushInstance.call(this, this.options.fps);
}
return this;
},
/**
* 判断动画是否正在运行
* @method Fx#isRunning
* @memberof fx/Fx
* @returns {Boolean} 动画是否正在运行
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var fx = new $fx();
* fx.start();
* fx.pause();
* fx.isRunning(); // false
*/
isRunning: function () {
var list = instances[this.options.fps];
return list && $contains(list, this);
},
});
$events.mixTo(Fx);
Fx.compute = function (from, to, delta) {
return (to - from) * delta + from;
};
Fx.Durations = { short: 250, normal: 500, long: 1000 };
module.exports = Fx;
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