112 lines
3.1 KiB
JavaScript
112 lines
3.1 KiB
JavaScript
/* @flow */
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import React, { Component } from 'react';
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/**
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* Used to modify initialValue, which is expected to be a decimal value between
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* 0 and 1, and converts it to a number representable by an input slider, which
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* recognizes whole numbers.
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*/
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const VOLUME_SLIDER_SCALE = 100;
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/**
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* The type of the React {@code Component} props of {@link VolumeSlider}.
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*/
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type Props = {
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/**
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* The value of the audio slider should display at when the component first
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* mounts. Changes will be stored in state. The value should be a number
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* between 0 and 1.
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*/
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initialValue: number,
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/**
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* The callback to invoke when the audio slider value changes.
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*/
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onChange: Function
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};
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/**
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* The type of the React {@code Component} state of {@link VolumeSlider}.
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*/
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type State = {
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/**
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* The volume of the participant's audio element. The value will
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* be represented by a slider.
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*/
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volumeLevel: number
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};
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/**
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* Implements a React {@link Component} which displays an input slider for
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* adjusting the local volume of a remote participant.
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*
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* @extends Component
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*/
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class VolumeSlider extends Component<Props, State> {
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/**
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* Initializes a new {@code VolumeSlider} instance.
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*
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* @param {Object} props - The read-only properties with which the new
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* instance is to be initialized.
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*/
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constructor(props: Props) {
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super(props);
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this.state = {
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volumeLevel: (props.initialValue || 0) * VOLUME_SLIDER_SCALE
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};
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// Bind event handlers so they are only bound once for every instance.
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this._onVolumeChange = this._onVolumeChange.bind(this);
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}
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/**
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* Implements React's {@link Component#render()}.
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*
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* @inheritdoc
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* @returns {ReactElement}
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*/
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render() {
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return (
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<li className = 'popupmenu__item'>
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<div className = 'popupmenu__contents'>
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<span className = 'popupmenu__icon'>
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<i className = 'icon-volume' />
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</span>
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<div className = 'popupmenu__slider_container'>
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<input
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className = 'popupmenu__slider'
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max = { VOLUME_SLIDER_SCALE }
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min = { 0 }
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onChange = { this._onVolumeChange }
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type = 'range'
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value = { this.state.volumeLevel } />
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</div>
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</div>
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</li>
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);
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}
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_onVolumeChange: (Object) => void;
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/**
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* Sets the internal state of the volume level for the volume slider.
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* Invokes the prop onVolumeChange to notify of volume changes.
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*
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* @param {Object} event - DOM Event for slider change.
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* @private
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* @returns {void}
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*/
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_onVolumeChange(event) {
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const volumeLevel = event.currentTarget.value;
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this.props.onChange(volumeLevel / VOLUME_SLIDER_SCALE);
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this.setState({ volumeLevel });
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}
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}
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export default VolumeSlider;
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