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+/**
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+ * @author wkh237
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+ * @version 0.1.1
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+ */
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+
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+// @flow
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+
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+import React, { Component } from 'react';
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+import {
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+ Text,
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+ View
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+} from 'react-native';
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+import Timer from 'react-timer-mixin';
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+
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+const HALF_RAD = Math.PI/2
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+
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+export default class AnimateNumber extends Component {
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+
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+ props : {
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+ countBy? : ?number,
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+ interval? : ?number,
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+ steps? : ?number,
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+ value : number,
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+ timing : 'linear' | 'easeOut' | 'easeIn' | () => number,
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+ formatter : () => {},
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+ onProgress : () => {},
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+ onFinish : () => {}
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+ };
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+
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+ static defaultProps = {
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+ interval : 14,
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+ timing : 'linear',
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+ steps : 45,
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+ value : 0,
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+ formatter : (val) => val,
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+ onFinish : () => {}
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+ };
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+
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+ static TimingFunctions = {
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+
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+ linear : (interval:number, progress:number):number => {
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+ return interval
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+ },
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+
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+ easeOut : (interval:number, progress:number):number => {
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+ return interval * Math.sin(HALF_RAD*progress) * 5
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+ },
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+
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+ easeIn : (interval:number, progress:number):number => {
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+ return interval * Math.sin((HALF_RAD - HALF_RAD*progress)) * 5
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+ },
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+
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+ };
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+
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+ state : {
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+ value? : ?number,
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+ displayValue? : ?number
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+ };
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+
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+ /**
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+ * Animation direction, true means positive, false means negative.
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+ * @type {bool}
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+ */
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+ direction : bool;
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+ /**
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+ * Start value of last animation.
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+ * @type {number}
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+ */
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+ startFrom : number;
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+ /**
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+ * End value of last animation.
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+ * @type {number}
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+ */
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+ endWith : number;
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+
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+ constructor(props:any) {
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+ super(props);
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+ // default values of state and non-state variables
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+ this.state = {
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+ value : 0,
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+ displayValue : 0
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+ }
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+ this.dirty = false;
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+ this.startFrom = 0;
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+ this.endWith = 0;
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+ }
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+
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+ componentDidMount() {
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+ this.startFrom = this.state.value
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+ this.endWith = this.props.value
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+ this.dirty = true
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+ this.startAnimate()
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+ }
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+
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+ componentWillUpdate(nextProps, nextState) {
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+
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+ // check if start an animation
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+ if(this.props.value !== nextProps.value) {
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+ this.startFrom = this.props.value
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+ this.endWith = nextProps.value
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+ this.dirty = true
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+ this.startAnimate()
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+ return
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+ }
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+ // Check if iterate animation frame
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+ if(!this.dirty) {
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+ return
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+ }
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+ if (this.direction === true) {
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+ if(parseFloat(this.state.value) <= parseFloat(this.props.value)) {
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+ this.startAnimate();
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+ }
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+ }
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+ else if(this.direction === false){
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+ if (parseFloat(this.state.value) >= parseFloat(this.props.value)) {
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+ this.startAnimate();
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+ }
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+ }
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+
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+ }
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+
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+ render() {
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+ return (
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+ <Text {...this.props}>
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+ {this.state.displayValue}
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+ </Text>)
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+ }
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+
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+ startAnimate() {
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+
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+ let progress = this.getAnimationProgress()
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+
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+ Timer.setTimeout(() => {
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+
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+ let value = (this.endWith - this.startFrom)/this.props.steps
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+ if(this.props.countBy)
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+ value = Math.sign(value)*Math.abs(this.props.countBy)
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+ let total = parseFloat(this.state.value) + parseFloat(value)
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+
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+ this.direction = (value > 0)
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+ // animation terminate conditions
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+ if (((this.direction) ^ (total <= this.endWith)) === 1) {
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+ this.dirty = false
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+ total = this.endWith
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+ this.props.onFinish(total, this.props.formatter(total))
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+ }
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+
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+ if(this.props.onProgress)
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+ this.props.onProgress(this.state.value, total)
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+
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+ this.setState({
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+ value : total,
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+ displayValue : this.props.formatter(total)
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+ })
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+
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+ }, this.getTimingFunction(this.props.interval, progress))
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+
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+ }
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+
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+ getAnimationProgress():number {
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+ return (this.state.value - this.startFrom) / (this.endWith - this.startFrom)
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+ }
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+
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+ getTimingFunction(interval:number, progress:number) {
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+ if(typeof this.props.timing === 'string') {
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+ let fn = AnimateNumber.TimingFunctions[this.props.timing]
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+ return fn(interval, progress)
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+ } else if(typeof this.props.timing === 'function')
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+ return this.props.timing(interval, progress)
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+ else
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+ return AnimateNumber.TimingFunctions['linear'](interval, progress)
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+ }
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+
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+}
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