Add tickInterval option

README.md

@@ -24,6 +24,7 @@ import { Stopwatch, Timer } from 'react-native-stopwatch-timer'
 |options|object|describes style of rendered timer/stopwatch|see example|
 |getTime|function|get the formatted value on each tick|(time) => console.log(time)|
 |getMsecs|function|get the number of msecs on each tick|(time) => console.log(time)|
+|tickInterval|number|set the interval for the getTime and getMsecs functions to be executed|1ms
 
 
 #### Stopwatch Options

lib/stopwatch.js

@@ -14,6 +14,7 @@ class StopWatch extends Component {
     getTime: PropTypes.func,
     startTime: PropTypes.number,
     getMsecs: PropTypes.func,
+    tickInterval: PropTypes.number
   }
 
   constructor(props) {
@@ -68,6 +69,9 @@ class StopWatch extends Component {
   }
 
   start() {
+    // default to 1 millisecond
+    const tickInterval = this.props.tickInterval || 1
+
     if (this.props.laps && this.state.elapsed) {
       let lap = new Date() - this.state.stopTime;
       this.setState({
@@ -81,7 +85,7 @@ class StopWatch extends Component {
 
     this.interval = this.interval ? this.interval : setInterval(() => {
         this.setState({elapsed: new Date() - this.state.startTime });
-    }, 1);
+    }, tickInterval);
   }
 
   stop() {

lib/timer.js

@@ -13,6 +13,7 @@ class Timer extends Component {
     totalDuration: PropTypes.number,
     getTime: PropTypes.func,
     getMsecs: PropTypes.func,
+    tickInterval: PropTypes.number
   }
 
   constructor(props) {
@@ -62,6 +63,8 @@ class Timer extends Component {
   start() {
     const handleFinish = this.props.handleFinish ? this.props.handleFinish : () => alert("Timer Finished");
     const endTime = new Date().getTime() + this.state.remainingTime;
+    // default to 1 millisecond
+    const tickInterval = this.props.tickInterval || 1
     this.interval = setInterval(() => {
       const remaining = endTime - new Date();
       if(remaining <= 1000) {
@@ -71,7 +74,7 @@ class Timer extends Component {
         return;
       }
       this.setState({remainingTime: remaining});
-    }, 1);
+    }, tickInterval);
   }
 
   stop() {