Iris/src/js/components/TrackList.js

import React, { PropTypes } from 'react'
import { connect } from 'react-redux'
import { bindActionCreators } from 'redux'
import FontAwesome from 'react-fontawesome'

import Track from './Track'
import ContextMenuTrigger from './ContextMenuTrigger'

import * as helpers from '../helpers'
import * as mopidyActions from '../services/mopidy/actions'
import * as uiActions from '../services/ui/actions'

class TrackList extends React.Component{

	constructor(props) {
		super(props)

		this.state = {
			tracks: [],
			last_selected_track: false
		}

		this._touching = false
		this.handleKeyUp = this.handleKeyUp.bind(this)
	}

	componentWillMount(){
		window.addEventListener("keyup", this.handleKeyUp, false);
	}

	componentWillUnmount(){
		window.removeEventListener("keyup", this.handleKeyUp, false);
	}

	componentDidMount(){
		this.setState({ tracks: this.keyifyTracks(this.props.tracks, true) })
	}

	componentWillReceiveProps(nextProps){
		this.setState({ tracks: this.keyifyTracks(nextProps.tracks) });
	}

	/**
	 * Figure out if our click/touch event is valid and we can act accordingly
	 *
	 * @param e = event obj
	 * @return string
	 **/
	triggerType(e){
		var target = $(e.target)

		// Wide screen, so no worries
		if ($(window).width() > 800){
			return 'default'
		} else if (target.is('.state-icon') || target.closest('.state-icon').length > 0){
			return 'mobile'
		}

		return false
	}

	handleKeyUp(e){
		if( this.selectedTracks().length <= 0 ) return;

		switch(e.keyCode){
			
			case 13: // enter
				 this.playTracks();
				break;
			
			case 46: // delete
				 this.removeTracks();
				break;
		}
	}

	handleTouchStart(e,index){
		this._touching = true
	}

	handleTouchEnd(e,index){
		this._touching = false
		this.handleMouseDown(e,index)

		// Prevent any event bubbling. This prevents clicks and mouse events
		// from also being fired
		e.preventDefault()
	}

	handleDoubleClick(e,index){
		if (this.props.context_menu) this.props.uiActions.hideContextMenu()
		this.playTracks()
	}

	handleMouseDown(e,index){
		if (this.props.context_menu) this.props.uiActions.hideContextMenu()

		// Regular clicking an un-selected element
		// This selects the track before we potentially drag
		switch (this.triggerType(e)){

			case 'mobile':
				// simple toggle
				var tracks = this.state.tracks
				tracks[index].selected = !tracks[index].selected
				this.setState({tracks: tracks, last_selected_track: index})
				break

			case 'default':
				if (!this.state.tracks[index].selected && !this.isRightClick(e) && !e.ctrlKey){
					this.toggleTrackSelections(e, index)
				}
				break
		}

		var selected_tracks = this.selectedTracks()
		this.props.uiActions.dragStart( e, this.props.context, this.props.uri, selected_tracks, this.tracksIndexes(selected_tracks) )
	}

	handleMouseUp(e,index){
		if (this.triggerType(e) == 'default'){
			
			// right-clicking on an un-highlighted track
			if (!this.state.tracks[index].selected && this.isRightClick(e)){
				this.toggleTrackSelections(e, index)

			// selected track, regular click
			}else if (this.state.tracks[index].selected && !this.isRightClick(e)){
				this.toggleTrackSelections(e, index)

			// ctrl key
			} else if(e.ctrlKey){
				this.toggleTrackSelections(e, index)
			}

			if (this.props.dragger && this.props.dragger.active){
			
				// if this tracklist handles sorting, handle it
				if (typeof(this.props.reorderTracks) !== 'undefined'){
					var indexes = this.props.dragger.victims_indexes
					return this.props.reorderTracks( indexes, index )
				}
			}
		}
	}

	handleContextMenu(e, native_event = true){

		// Only enable direct context menu events in default (desktop) view
		// This prevents tap-and-hold functionality
		if (native_event && this.triggerType(e) != 'default'){
			return false
		}

		var selected_tracks = this.selectedTracks()
		var data = {
			e: e,
			context: (this.props.context ? this.props.context+'-track' : 'track'),
			tracklist_uri: (this.props.uri ? this.props.uri : null),
			items: selected_tracks,
			uris: helpers.asURIs(selected_tracks),
			indexes: this.tracksIndexes(selected_tracks)
		}
		this.props.uiActions.showContextMenu(data)

		if (!native_event){
			this.deselectAllTracks()
			this.setState({edit_mode: false})
		}
	}

	toggleTrackSelections(e,index){
		var tracks = this.state.tracks
		var last_selected_track = this.state.last_selected_track

		if( e.ctrlKey ){

			if (tracks[index].selected){
				tracks[index].selected = false
			} else {
				tracks[index].selected = true
				last_selected_track = index
			}

		}else if( e.shiftKey ){

			if( this.state.last_selected_track < index ){
				var start = this.state.last_selected_track
				var end = index
			}else{
				var start = index
				var end = this.state.last_selected_track
			}

			if (start !== false && end !== false){
				for( var i = start; i <= end; i++ ){
					tracks[i].selected = true
					last_selected_track = index
				}
			}

		}else{

			for( var i = 0; i < tracks.length; i++ ){
				tracks[i].selected = false
			}

			tracks[index].selected = true
			last_selected_track = index
		}

		this.setState({ tracks: tracks, last_selected_track: last_selected_track })
	}

	deselectAllTracks(){		
		var tracks = this.props.tracks
		for (var i = 0; i < tracks.length; i++){
			tracks[i].selected = false
		}
		this.setState({tracks: tracks})
	}

	isRightClick(e){
		if( 'which' in e ) 
			return e.which == 3
		if( 'button' in e ) 
			return e.button == 2
		return false
	}

	keyifyTracks(tracks, deselect = false){
		for( var i = 0; i < tracks.length; i++ ){
			var new_properties = {
				key: i+'_'+tracks[i].uri
			}
			if (deselect){
				new_properties.selected = false
			}
			tracks[i] = Object.assign(
				{}, 
				tracks[i], 
				new_properties
			)
		}
		return tracks
	}

	selectedTracks(){
		if (!this.state.tracks || this.state.tracks.length <= 0){
			return []
		} else {
			function isSelected( track ){
				return ( typeof(track.selected) !== 'undefined' && track.selected );
			}
			return this.state.tracks.filter(isSelected)
		}
	}

	tracksIndexes(tracks){
		var indexes = []
		for( var i = 0; i < tracks.length; i++ ){
			indexes.push( this.props.tracks.indexOf(tracks[i]))
		}
		return indexes
	}

	playTracks(){

		var tracks = this.selectedTracks();

		// if we've got a specific action, run it
		if( typeof(this.props.playTracks) !== 'undefined' ){
			return this.props.playTracks( tracks );
		}

		// default to playing a bunch of uris
		var uris = [];
		for( var i = 0; i < tracks.length; i++ ){
			uris.push( tracks[i].uri )
		}
		return this.props.mopidyActions.playURIs( uris, this.props.uri )
	}

	removeTracks(){
		
		// if this tracklist handles removal, handle it
		if( typeof(this.props.removeTracks) !== 'undefined' ){
			var tracks = this.selectedTracks();
			var tracks_indexes = this.tracksIndexes(tracks);
			return this.props.removeTracks( tracks_indexes );
		}

		// by default, do nothing
	}

	renderHeader(){
		if( this.props.noheader ) return null
		
		switch (this.props.context){

			case 'history':
				return (
					<div className="list-item header track">
						<span className="col name">Name</span>
						<span className="col source">Source</span>
						<span className="col played_at">Started playing</span>
					</div>
				)
				break

			case 'queue':
				return (
					<div className="list-item header track">
						<span className="col name">Name</span>
						<span className="col artists">Artists</span>
						<span className="col album">Album</span>
						<span className="col added">Added by</span>
						<span className="col duration">Length</span>
					</div>
				)
				break

			default:
				return (
					<div className="list-item header track">
						<span className="col name">Name</span>
						<span className="col artists">Artists</span>
						<span className="col album">Album</span>
						<span className="col duration">Length</span>
					</div>
				)
		}
	}

	render(){
		if( !this.state.tracks || Object.prototype.toString.call(this.state.tracks) !== '[object Array]' ) return null

		let self = this;
		var className = 'list track-list '+this.props.context
		if (this.props.className){
			className += ' '+this.props.className
		}

		return (
			<div className={className}>
				{ this.renderHeader() }
				{
					this.state.tracks.map(
						(track, index) => {
							return <Track
									show_source_icon={this.props.show_source_icon}
									key={track.key} 
									track={track} 
									context={this.props.context} 
									handleDoubleClick={e => self.handleDoubleClick(e, index)}
									handleMouseUp={e => self.handleMouseUp(e, index)}
									handleMouseDown={e => self.handleMouseDown(e, index)}
									handleTouchStart={e => self.handleTouchStart(e, index)}
									handleTouchEnd={e => self.handleTouchEnd(e, index)}
									handleContextMenu={e => self.handleContextMenu(e)} />
						}
					)
				}
				{this.selectedTracks().length > 0 ? <ContextMenuTrigger onTrigger={e => this.handleContextMenu(e, false)} /> : null}
			</div>
		);
	}
}


/**
 * Export our component
 *
 * We also integrate our global store, using connect()
 **/

const mapStateToProps = (state, ownProps) => {
	return {
		dragger: state.ui.dragger,
		emulate_touch: state.ui.emulate_touch,
		current_track: state.ui.current_track,
		context_menu: state.ui.context_menu
	}
}

const mapDispatchToProps = (dispatch) => {
	return {
		mopidyActions: bindActionCreators(mopidyActions, dispatch),
		uiActions: bindActionCreators(uiActions, dispatch)
	}
}

export default connect(mapStateToProps, mapDispatchToProps)(TrackList)