cc-ui-uni-app
Version:
cc-ui, uni-app组件库, 一切为了简单
270 lines (256 loc) • 8.32 kB
JavaScript
class WxCountUp {
constructor(target = '', endVal = 0, options = {}, context = {}) {
var _this = this
this.target = target;
this.endVal = endVal;
this.options = options;
this.context = context;
this.version = '1.0.0';
this.defaults = {
startVal: 0,
decimalPlaces: 0,
duration: 2,
useEasing: true,
useGrouping: true,
smartEasingThreshold: 999,
smartEasingAmount: 333,
separator: ',',
decimal: '.',
prefix: '',
suffix: ''
}
this.finalEndVal = null;
this.useEasing = true;
this.countDown = false;
this.error = '';
this.startVal = 0;
this.paused = true;
this.count = function (timestamp) {
if (!_this.startTime) {
_this.startTime = timestamp;
}
var progress = timestamp - _this.startTime;
_this.remaining = _this.duration - progress;
// to ease or not to ease
if (_this.useEasing) {
if (_this.countDown) {
_this.frameVal = _this.startVal - _this.easingFn(progress, 0, _this.startVal - _this.endVal, _this.duration);
}
else {
_this.frameVal = _this.easingFn(progress, _this.startVal, _this.endVal - _this.startVal, _this.duration);
}
}
else {
if (_this.countDown) {
_this.frameVal = _this.startVal - ((_this.startVal - _this.endVal) * (progress / _this.duration));
}
else {
_this.frameVal = _this.startVal + (_this.endVal - _this.startVal) * (progress / _this.duration);
}
}
// don't go past endVal since progress can exceed duration in the last frame
if (_this.countDown) {
_this.frameVal = (_this.frameVal < _this.endVal) ? _this.endVal : _this.frameVal;
}
else {
_this.frameVal = (_this.frameVal > _this.endVal) ? _this.endVal : _this.frameVal;
}
// decimal
_this.frameVal = Math.round(_this.frameVal * _this.decimalMult) / _this.decimalMult;
// format and print value
_this.printValue(_this.frameVal);
// whether to continue
if (progress < _this.duration) {
_this.rAF = doAnimationFrame(_this.count);
}
else if (_this.finalEndVal !== null) {
// smart easing
_this.update(_this.finalEndVal);
}
else {
if (_this.callback) {
_this.callback();
}
}
};
// 默认格式和缓和函数
this.formatNumber = function (num) {
var neg = (num < 0) ? '-' : '';
var result, x, x1, x2, x3;
result = Math.abs(num).toFixed(_this.options.decimalPlaces);
result += '';
x = result.split('.');
x1 = x[0];
x2 = x.length > 1 ? _this.options.decimal + x[1] : '';
if (_this.options.useGrouping) {
x3 = '';
for (var i = 0, len = x1.length; i < len; ++i) {
if (i !== 0 && (i % 3) === 0) {
x3 = _this.options.separator + x3;
}
x3 = x1[len - i - 1] + x3;
}
x1 = x3;
}
// optional numeral substitution
if (_this.options.numerals && _this.options.numerals.length) {
x1 = x1.replace(/[0-9]/g, function (w) { return _this.options.numerals[+w]; });
x2 = x2.replace(/[0-9]/g, function (w) { return _this.options.numerals[+w]; });
}
return neg + _this.options.prefix + x1 + x2 + _this.options.suffix;
};
this.easeOutExpo = function (t, b, c, d) {
return c * (-Math.pow(2, -10 * t / d) + 1) * 1024 / 1023 + b;
};
this.options = __assign({}, this.defaults, options);
this.formattingFn = (this.options.formattingFn) ? this.options.formattingFn : this.formatNumber;
this.easingFn = (this.options.easingFn) ? this.options.easingFn : this.easeOutExpo;
this.startVal = this.validateValue(this.options.startVal);
this.frameVal = this.startVal;
this.endVal = this.validateValue(endVal);
this.options.decimalPlaces = Math.max(0 || this.options.decimalPlaces);
this.decimalMult = Math.pow(10, this.options.decimalPlaces);
this.resetDuration();
this.options.separator = String(this.options.separator);
this.useEasing = this.options.useEasing;
if (this.options.separator === '') {
this.options.useGrouping = false;
}
if (this.target && typeof target === 'string') {
this.printValue(this.startVal);
} else {
this.error = '[CountUp] target is null or undefined';
}
}
// 决定数字滚动的方向
determineDirectionAndSmartEasing () {
var end = (this.finalEndVal) ? this.finalEndVal : this.endVal;
this.countDown = (this.startVal > end);
var animateAmount = end - this.startVal;
if (Math.abs(animateAmount) > this.options.smartEasingThreshold) {
this.finalEndVal = end;
var up = (this.countDown) ? 1 : -1;
this.endVal = end + (up * this.options.smartEasingAmount);
this.duration = this.duration / 2;
}
else {
this.endVal = end;
this.finalEndVal = null;
}
if (this.finalEndVal) {
this.useEasing = false;
}
else {
this.useEasing = this.options.useEasing;
}
}
// 开始动画
start (callback) {
if (this.error || !this.context) {
return;
}
this.callback = callback;
if (this.duration > 0) {
this.determineDirectionAndSmartEasing();
this.paused = false;
this.rAF = doAnimationFrame(this.count);
} else {
this.printValue(this.endVal);
}
}
// 暂停/恢复动画
pauseResume () {
if (!this.paused) {
abortAnimationFrame(this.rAF);
} else {
this.startTime = null;
this.duration = this.remaining;
this.startVal = this.frameVal;
this.determineDirectionAndSmartEasing();
this.rAF = doAnimationFrame(this.count);
}
this.paused = !this.paused;
}
// 重置为 startVal，以便动画可以再次运行
reset () {
abortAnimationFrame(this.rAF);
this.paused = true;
this.resetDuration();
this.startVal = this.validateValue(this.options.startVal);
this.frameVal = this.startVal;
this.printValue(this.startVal);
}
// 通过一个新的 endVal 并开始动画
update (newEndVal) {
abortAnimationFrame(this.rAF);
this.startTime = null;
this.endVal = this.validateValue(newEndVal);
if (this.endVal === this.frameVal) {
return;
}
this.startVal = this.frameVal;
if (!this.finalEndVal) {
this.resetDuration();
}
this.determineDirectionAndSmartEasing();
this.rAF = doAnimationFrame(this.count);
}
// 输出值
printValue (val) {
var result = this.formattingFn(val)
this.context[this.target] = result
}
// 是否数字类型
ensureNumber (n) {
return (typeof n === 'number' && !isNaN(n));
}
// 验证值的类型
validateValue (value) {
var newValue = Number(value);
if (!this.ensureNumber(newValue)) {
this.error = "[CountUp] invalid start or end value: " + value;
return null;
}
else {
return newValue;
}
}
// 重置动画间隔
resetDuration () {
this.startTime = null;
this.duration = Number(this.options.duration) * 1000;
this.remaining = this.duration;
}
}
/**
* 复制对象
*/
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
/**
* 代替 requestAnimationFrame 帧渲染
* copy from https://www.dennic365.com/blog/?p=87
*/
var lastFrameTime = 0;
// 模拟 requestAnimationFrame
var doAnimationFrame = function (callback) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastFrameTime));
var id = setTimeout(function () { callback(currTime + timeToCall); }, timeToCall);
lastFrameTime = currTime + timeToCall;
return id;
};
// 模拟 cancelAnimationFrame
var abortAnimationFrame = function (id) {
clearTimeout(id)
}
export default WxCountUp