React Native Trimmer

A Trimmer component that renders in iOS and Android and built entirely in React Native.

Install

npm install react-native-trimmer 
or 
yarn add react-native-trimmer`

import Trimmer from 'react-native-trimmer'

Required Props

Name	Type	Description
trimmerLeftHandlePosition	Number	This is the value in milliseconds of the left handle. This value will always control the left handle unless the left handle is currently being selected and positioned
trimmerRightHandlePosition	Number	This is the value in milliseconds of the left handle. This value will always control the left handle unless the left handle is currently being selected and positioned
totalDuration	Number	The total duration in milliseconds
onLeftHandleChange	Function	Callback for when the Trimmer component updates the trimmerLeftHandlePosition. Function has 1 arguemnt, the new value in milliseconds
onRightHandleChange	Function	Callback for when the Trimmer component updates the trimmerRightHandlePosition. Function has 1 arguemnt, the new value in milliseconds

Optional Props

Name	Type	Default Value	Description
maxTrimDuration	Number	60000	The maxium value in milliseconds the trimmer can be expanded too
maximumZoomLevel	Number	50	The maxium value zoom level the Trimmer can zoom into. The minimum value is always 1. A value of 50 would be you can scale the trimmer to 50x the minimum.
zoomMultiplier	Number	5	This is a multiplier on how fast the zoom will zoom. A value of 1 will zoom a lot slower than a value of 20
initialZoomValue	Number	2	Initial zoom for the Trimmer when it is constructed
scaleInOnInit	Boolean	false	This boolean will disregard the above initialZoomValue and attempt to zoom in the proper level so the trimmer renders half width of the screen while also staying within the bounds of the maximumZoomLevel. This is a useful prop if the ratio of
scaleInOnInitType	String	trim-duration	Provides an option for scaleInOnInit to either use the duration of the trimmer trim-duration or the maxTrimDuration with max-duration. Using max-duration ensures that the trimmer will always fit in the visible area.

trimmerRightHandlePosition - trimmerLeftHandlePosition to totalDuration varying by magnitudes scrubberPosition | Number | null | Position of the scrubber to be controlled by the parent component. A value of null will not render the scrubber onScrubbingComplete | Function | null | A callback for when the scrubbing is completed on the Trimmer onLeftHandlePressIn | Function | null | A callback for when the left handle is initially pressed in. Useful if you want to provide some haptics to the user on this press in. onRightHandlePressIn | Function | null | A callback for when the right handle is initially pressed in. Useful if you want to provide some haptics to the user on this press in. onScrubberPressIn | Function | null | A callback for when the scrubber is initially pressed in. Useful if you want to provide some haptics to the user on this press in. tintColor | String | '#93b5b3' | Color of the trimmer markerColor | String | '#c8dad3' | Color of the markers in the track trackBackgroundColor | String | '#f2f6f5' | Color of the track background trackBorderColor | String | '#c8dad3' | Color of the track border scrubberColor | String | '#63707e' | Color of the scrubber scrubberPosition={scrubberPosition} showScrollIndicator | Boolean | true | Option to show or hide the scroll indicator. centerOnLayout | Boolean | true | Enabling this option ensure that the trimmer is visible / centered after the component's onLayout.

Basic Example

import React, { Component } from 'react'
import { View } from 'react-native'
import Trimmer from 'react-native-trimmer'
 
class Example extends Component {
  state = {
    trimmerLeftHandlePosition: 0,
    trimmerRightHandlePosition: 10000,
  }
  
  onLeftHandleChange = (newLeftHandleValue) => {
    this.setState({ trimmerLeftHandlePosition: newLeftHandleValue })
  }
 
  onRightHandleChange = (newRightHandleValue) => {
    this.setState({ trimmerRightHandlePosition: newRightHandleValue })
  }
 
  render() {
    const {
      trimmerLeftHandlePosition,
      trimmerRightHandlePosition,
    } = this.state;
    return (
      <View>
        <Trimmer
          onLeftHandleChange={this.onLeftHandleChange}
          onRightHandleChange={this.onRightHandleChange}
          totalDuration={60000}
          trimmerLeftHandlePosition={trimmerLeftHandlePosition}
          trimmerRightHandlePosition={trimmerRightHandlePosition}
        />
      </View>
    );
  }
}

Advanced Example

import React, { Component } from 'react'
import { View, Button } from 'react-native'
import Trimmer from 'react-native-trimmer'
 
 
const maxTrimDuration = 60000;
const minimumTrimDuration = 1000;
const totalDuration = 180000
 
const initialLeftHandlePosition = 0;
const initialRightHandlePosition = 36000;
 
const scrubInterval = 50;
 
class Example extends Component {
  state = {
    playing: false,
    trimmerLeftHandlePosition: initialLeftHandlePosition,
    trimmerRightHandlePosition: initialRightHandlePosition,
    scrubberPosition: 1000
  }
  
 
  playScrubber = () => {
    this.setState({ playling: true });
 
    this.scrubberInterval = setInterval(() => {
      this.setState({ scrubberPosition: this.state.scrubberPosition + scrubInterval })
    }, scrubInterval)
  }
 
  pauseScrubber = () => {
    clearInterval(this.scrubberInterval)
 
    this.setState({ playling: false, scrubberPosition: this.state.trimmerLeftHandlePosition });
  }
 
  onLeftHandleChange = (newLeftHandleValue) => {
    this.setState({ trimmerLeftHandlePosition: newLeftHandleValue })
  }
 
  onRightHandleChange = (newRightHandleValue) => {
    this.setState({ trimmerRightHandlePosition: newRightHandleValue })
  }
 
  onScrubbingComplete = (newValue) => {
    this.setState({ playing: false, scrubberPosition: newValue })
  }
 
  render() {
    const {
      trimmerLeftHandlePosition,
      trimmerRightHandlePosition,
      scrubberPosition,
      playling,
    } = this.state;
    
    return (
      <View>
        {
          playling
            ? <Button title="Pause" color="#f638dc" onPress={this.pauseScrubber}/>
            : <Button title="Play" color="#f638dc" onPress={this.playScrubber}/>
        }
        <Trimmer
          onLeftHandleChange={this.onLeftHandleChange}
          onRightHandleChange={this.onRightHandleChange}
          totalDuration={totalDuration}
          trimmerLeftHandlePosition={trimmerLeftHandlePosition}
          trimmerRightHandlePosition={trimmerRightHandlePosition}
          minimumTrimDuration={minimumTrimDuration}
          maxTrimDuration={maxTrimDuration}
          maximumZoomLevel={200}
          zoomMultiplier={20}
          initialZoomValue={2}
          scaleInOnInit={true}
          tintColor="#f638dc"
          markerColor="#5a3d5c"
          trackBackgroundColor="#382039"
          trackBorderColor="#5a3d5c"
          scrubberColor="#b7e778"
          scrubberPosition={scrubberPosition}
          onScrubbingComplete={this.onScrubbingComplete}
          onLeftHandlePressIn={() => console.log('onLeftHandlePressIn')}
          onRightHandlePressIn={() => console.log('onRightHandlePressIn')}
          onScrubberPressIn={() => console.log('onScrubberPressIn')}
        />
      </View>
    );
  }
}