gree_leran/node_modules/uview-plus/components/u-count-to/u-count-to.vue

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2024-06-14 01:11:29 +00:00
<template>
<text
class="u-count-num"
:style="{
fontSize: addUnit(fontSize),
fontWeight: bold ? 'bold' : 'normal',
color: color
}"
>{{ displayValue }}</text>
</template>
<script>
import props from './props';
import mpMixin from '../../libs/mixin/mpMixin';
import mixin from '../../libs/mixin/mixin';
import { addUnit } from '../../libs/function/index';
/**
* countTo 数字滚动
* @description 该组件一般用于需要滚动数字到某一个值的场景目标要求是一个递增的值
* @tutorial https://ijry.github.io/uview-plus/components/countTo.html
* @property {String | Number} startVal 开始的数值默认从0增长到某一个数默认 0
* @property {String | Number} endVal 要滚动的目标数值必须 默认 0
* @property {String | Number} duration 滚动到目标数值的动画持续时间单位为毫秒ms 默认 2000
* @property {Boolean} autoplay 设置数值后是否自动开始滚动 默认 true
* @property {String | Number} decimals 要显示的小数位数见官网说明默认 0
* @property {Boolean} useEasing 滚动结束时是否缓动结尾见官网说明默认 true
* @property {String} decimal 十进制分割 默认 "."
* @property {String} color 字体颜色 默认 '#606266' )
* @property {String | Number} fontSize 字体大小单位px 默认 22
* @property {Boolean} bold 字体是否加粗默认 false
* @property {String} separator 千位分隔符见官网说明
* @event {Function} end 数值滚动到目标值时触发
* @example <u-count-to ref="uCountTo" :end-val="endVal" :autoplay="autoplay"></u-count-to>
*/
export default {
name: 'u-count-to',
data() {
return {
localStartVal: this.startVal,
displayValue: this.formatNumber(this.startVal),
printVal: null,
paused: false, // 是否暂停
localDuration: Number(this.duration),
startTime: null, // 开始的时间
timestamp: null, // 时间戳
remaining: null, // 停留的时间
rAF: null,
lastTime: 0 // 上一次的时间
};
},
mixins: [mpMixin, mixin,props],
computed: {
countDown() {
return this.startVal > this.endVal;
}
},
watch: {
startVal() {
this.autoplay && this.start();
},
endVal() {
this.autoplay && this.start();
}
},
mounted() {
this.autoplay && this.start();
},
emits: ["end"],
methods: {
addUnit,
easingFn(t, b, c, d) {
return (c * (-Math.pow(2, (-10 * t) / d) + 1) * 1024) / 1023 + b;
},
requestAnimationFrame(callback) {
const currTime = new Date().getTime();
// 为了使setTimteout的尽可能的接近每秒60帧的效果
const timeToCall = Math.max(0, 16 - (currTime - this.lastTime));
const id = setTimeout(() => {
callback(currTime + timeToCall);
}, timeToCall);
this.lastTime = currTime + timeToCall;
return id;
},
cancelAnimationFrame(id) {
clearTimeout(id);
},
// 开始滚动数字
start() {
this.localStartVal = this.startVal;
this.startTime = null;
this.localDuration = this.duration;
this.paused = false;
this.rAF = this.requestAnimationFrame(this.count);
},
// 暂定状态,重新再开始滚动;或者滚动状态下,暂停
reStart() {
if (this.paused) {
this.resume();
this.paused = false;
} else {
this.stop();
this.paused = true;
}
},
// 暂停
stop() {
this.cancelAnimationFrame(this.rAF);
},
// 重新开始(暂停的情况下)
resume() {
if (!this.remaining) return
this.startTime = 0;
this.localDuration = this.remaining;
this.localStartVal = this.printVal;
this.requestAnimationFrame(this.count);
},
// 重置
reset() {
this.startTime = null;
this.cancelAnimationFrame(this.rAF);
this.displayValue = this.formatNumber(this.startVal);
},
count(timestamp) {
if (!this.startTime) this.startTime = timestamp;
this.timestamp = timestamp;
const progress = timestamp - this.startTime;
this.remaining = this.localDuration - progress;
if (this.useEasing) {
if (this.countDown) {
this.printVal = this.localStartVal - this.easingFn(progress, 0, this.localStartVal - this.endVal, this.localDuration);
} else {
this.printVal = this.easingFn(progress, this.localStartVal, this.endVal - this.localStartVal, this.localDuration);
}
} else {
if (this.countDown) {
this.printVal = this.localStartVal - (this.localStartVal - this.endVal) * (progress / this.localDuration);
} else {
this.printVal = this.localStartVal + (this.endVal - this.localStartVal) * (progress / this.localDuration);
}
}
if (this.countDown) {
this.printVal = this.printVal < this.endVal ? this.endVal : this.printVal;
} else {
this.printVal = this.printVal > this.endVal ? this.endVal : this.printVal;
}
this.displayValue = this.formatNumber(this.printVal) || 0;
if (progress < this.localDuration) {
this.rAF = this.requestAnimationFrame(this.count);
} else {
this.$emit('end');
}
},
// 判断是否数字
isNumber(val) {
return !isNaN(parseFloat(val));
},
formatNumber(num) {
// 将num转为Number类型因为其值可能为字符串数值调用toFixed会报错
num = Number(num);
num = num.toFixed(Number(this.decimals));
num += '';
const x = num.split('.');
let x1 = x[0];
const x2 = x.length > 1 ? this.decimal + x[1] : '';
const rgx = /(\d+)(\d{3})/;
if (this.separator && !this.isNumber(this.separator)) {
while (rgx.test(x1)) {
x1 = x1.replace(rgx, '$1' + this.separator + '$2');
}
}
return x1 + x2;
},
destroyed() {
this.cancelAnimationFrame(this.rAF);
}
}
};
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
.u-count-num {
/* #ifndef APP-NVUE */
display: inline-flex;
/* #endif */
text-align: center;
}
</style>