React Native Polyslider

This slider is probably having the smallest code size among others because it only provides base class of 45 lines of typescript that allows to build your own version of the slider that includes only what is neccessary in your project. To check it in action clone this repository. You need expo being installed on your machine. Install all dependencies with yarn or npm install then run yarn start or expo start from the root folder.

Getting Started

$ yarn add @tandu/polyslider

or

$ npm i @tandu/polyslider

Usage

Polyslider supposes that slider can have one track and several markers. It is a base class to build the slider.

There are 2 slider examples:

• slider: in demo/components/Slider is simple slider with just track and marker. Allows to define step.

• multislider: in demo/components/Multislider supports multiple marks, step offset and highlights ranges on a track.

You can reference those sliders while writing your version or just copy+paste Multislider / Slider folder into your application and edit inplace.

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Reference

Props

range

Defines slider range. For example [0, 10].

Type	Required
Array	Yes

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containerStyle

Style for the topmost view that contains slider elements. You can use it to setup margins or define slider width/height.

Type	Required
StyleProp<ViewStyle>	Yes

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markersContainerStyle

The main purpose of this property is to properly setup horizontal margins so that marker touches right edge of the track with its right edge. So you probably don't need to put anything other than marginHorizontal: <value> into here.

Type	Required
StyleProp<ViewStyle>	Yes

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track

It provides width to the function that should return track jsx component. width is useful to calculate ranges in case of multislider otherwise it can be ignored.

track = (width) =>
    <View style={{
      position: 'absolute',
      height: 6,
      top: 13,
      borderRadius: 5,
      width: '100%',
      backgroundColor: '#ac7ef4'
    }}/>

Type	Required
(width: number) => ReactElement	Yes

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marker

It provides val to the function that should return marker jsx component. val to show current value in a label belonging to the marker as it is done in multislider example otherwise it can be ignored.

marker = (val) =>
      <View style={{
        borderRadius: 15,
        borderWidth: 4,
        width: 28,
        height: 28,
        marginLeft: -14
      }}/>
    </View>

Type	Required
(val: number, index: number) => ReactElement	Yes

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values

Defines Array of values. For each value the marker is created. Should contain at least one element in an array.

Type	Required
number[]	Yes

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onChange

Is called on every marker move. val is new value and index matches the index in values array.

onChange = {(val, i) => {
  const newValues = [...values];
  newValues[i] = val;
  setValues(newValues);
}}

Type	Required
(val: number, index: number) => void	Yes

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onChangeFinished

Is called on marker move end when pan gesture is finished. val is new value and index matches the index in values array.

onChangeFinished = {(val, i) => {
  const newValues = [...values];
  newValues[i] = val;
  setValues(newValues);
}}

Type	Required
(val: number, index: number) => void	Yes

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