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Editing: selectable.js

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/*!
 * jQuery UI Selectable 1.13.3
 * https://jqueryui.com
 *
 * Copyright OpenJS Foundation and other contributors
 * Released under the MIT license.
 * https://jquery.org/license
 */

//>>label: Selectable
//>>group: Interactions
//>>description: Allows groups of elements to be selected with the mouse.
//>>docs: https://api.jqueryui.com/selectable/
//>>demos: https://jqueryui.com/selectable/
//>>css.structure: ../../themes/base/selectable.css

( function( factory ) {
	"use strict";

if ( typeof define === "function" && define.amd ) {

// AMD. Register as an anonymous module.
		define( [
			"jquery",
			"./mouse",
			"../version",
			"../widget"
		], factory );
	} else {

// Browser globals
		factory( jQuery );
	}
} )( function( $ ) {
"use strict";

return $.widget( "ui.selectable", $.ui.mouse, {
	version: "1.13.3",
	options: {
		appendTo: "body",
		autoRefresh: true,
		distance: 0,
		filter: "*",
		tolerance: "touch",

// Callbacks
		selected: null,
		selecting: null,
		start: null,
		stop: null,
		unselected: null,
		unselecting: null
	},
	_create: function() {
		var that = this;

this._addClass( "ui-selectable" );

this.dragged = false;

// Cache selectee children based on filter
		this.refresh = function() {
			that.elementPos = $( that.element[ 0 ] ).offset();
			that.selectees = $( that.options.filter, that.element[ 0 ] );
			that._addClass( that.selectees, "ui-selectee" );
			that.selectees.each( function() {
				var $this = $( this ),
					selecteeOffset = $this.offset(),
					pos = {
						left: selecteeOffset.left - that.elementPos.left,
						top: selecteeOffset.top - that.elementPos.top
					};
				$.data( this, "selectable-item", {
					element: this,
					$element: $this,
					left: pos.left,
					top: pos.top,
					right: pos.left + $this.outerWidth(),
					bottom: pos.top + $this.outerHeight(),
					startselected: false,
					selected: $this.hasClass( "ui-selected" ),
					selecting: $this.hasClass( "ui-selecting" ),
					unselecting: $this.hasClass( "ui-unselecting" )
				} );
			} );
		};
		this.refresh();

this._mouseInit();

this.helper = $( "<div>" );
		this._addClass( this.helper, "ui-selectable-helper" );
	},

_destroy: function() {
		this.selectees.removeData( "selectable-item" );
		this._mouseDestroy();
	},

_mouseStart: function( event ) {
		var that = this,
			options = this.options;

this.opos = [ event.pageX, event.pageY ];
		this.elementPos = $( this.element[ 0 ] ).offset();

if ( this.options.disabled ) {
			return;
		}

this.selectees = $( options.filter, this.element[ 0 ] );

this._trigger( "start", event );

$( options.appendTo ).append( this.helper );

// position helper (lasso)
		this.helper.css( {
			"left": event.pageX,
			"top": event.pageY,
			"width": 0,
			"height": 0
		} );

if ( options.autoRefresh ) {
			this.refresh();
		}

this.selectees.filter( ".ui-selected" ).each( function() {
			var selectee = $.data( this, "selectable-item" );
			selectee.startselected = true;
			if ( !event.metaKey && !event.ctrlKey ) {
				that._removeClass( selectee.$element, "ui-selected" );
				selectee.selected = false;
				that._addClass( selectee.$element, "ui-unselecting" );
				selectee.unselecting = true;

// selectable UNSELECTING callback
				that._trigger( "unselecting", event, {
					unselecting: selectee.element
				} );
			}
		} );

$( event.target ).parents().addBack().each( function() {
			var doSelect,
				selectee = $.data( this, "selectable-item" );
			if ( selectee ) {
				doSelect = ( !event.metaKey && !event.ctrlKey ) ||
					!selectee.$element.hasClass( "ui-selected" );
				that._removeClass( selectee.$element, doSelect ? "ui-unselecting" : "ui-selected" )
					._addClass( selectee.$element, doSelect ? "ui-selecting" : "ui-unselecting" );
				selectee.unselecting = !doSelect;
				selectee.selecting = doSelect;
				selectee.selected = doSelect;

// selectable (UN)SELECTING callback
				if ( doSelect ) {
					that._trigger( "selecting", event, {
						selecting: selectee.element
					} );
				} else {
					that._trigger( "unselecting", event, {
						unselecting: selectee.element
					} );
				}
				return false;
			}
		} );

_mouseDrag: function( event ) {

this.dragged = true;

if ( this.options.disabled ) {
			return;
		}

var tmp,
			that = this,
			options = this.options,
			x1 = this.opos[ 0 ],
			y1 = this.opos[ 1 ],
			x2 = event.pageX,
			y2 = event.pageY;

if ( x1 > x2 ) {
			tmp = x2; x2 = x1; x1 = tmp;
		}
		if ( y1 > y2 ) {
			tmp = y2; y2 = y1; y1 = tmp;
		}
		this.helper.css( { left: x1, top: y1, width: x2 - x1, height: y2 - y1 } );

this.selectees.each( function() {
			var selectee = $.data( this, "selectable-item" ),
				hit = false,
				offset = {};

//prevent helper from being selected if appendTo: selectable
			if ( !selectee || selectee.element === that.element[ 0 ] ) {
				return;
			}

offset.left   = selectee.left   + that.elementPos.left;
			offset.right  = selectee.right  + that.elementPos.left;
			offset.top    = selectee.top    + that.elementPos.top;
			offset.bottom = selectee.bottom + that.elementPos.top;

if ( options.tolerance === "touch" ) {
				hit = ( !( offset.left > x2 || offset.right < x1 || offset.top > y2 ||
                    offset.bottom < y1 ) );
			} else if ( options.tolerance === "fit" ) {
				hit = ( offset.left > x1 && offset.right < x2 && offset.top > y1 &&
                    offset.bottom < y2 );
			}

if ( hit ) {

// SELECT
				if ( selectee.selected ) {
					that._removeClass( selectee.$element, "ui-selected" );
					selectee.selected = false;
				}
				if ( selectee.unselecting ) {
					that._removeClass( selectee.$element, "ui-unselecting" );
					selectee.unselecting = false;
				}
				if ( !selectee.selecting ) {
					that._addClass( selectee.$element, "ui-selecting" );
					selectee.selecting = true;

// selectable SELECTING callback
					that._trigger( "selecting", event, {
						selecting: selectee.element
					} );
				}
			} else {

// UNSELECT
				if ( selectee.selecting ) {
					if ( ( event.metaKey || event.ctrlKey ) && selectee.startselected ) {
						that._removeClass( selectee.$element, "ui-selecting" );
						selectee.selecting = false;
						that._addClass( selectee.$element, "ui-selected" );
						selectee.selected = true;
					} else {
						that._removeClass( selectee.$element, "ui-selecting" );
						selectee.selecting = false;
						if ( selectee.startselected ) {
							that._addClass( selectee.$element, "ui-unselecting" );
							selectee.unselecting = true;
						}

// selectable UNSELECTING callback
						that._trigger( "unselecting", event, {
							unselecting: selectee.element
						} );
					}
				}
				if ( selectee.selected ) {
					if ( !event.metaKey && !event.ctrlKey && !selectee.startselected ) {
						that._removeClass( selectee.$element, "ui-selected" );
						selectee.selected = false;

that._addClass( selectee.$element, "ui-unselecting" );
						selectee.unselecting = true;

// selectable UNSELECTING callback
						that._trigger( "unselecting", event, {
							unselecting: selectee.element
						} );
					}
				}
			}
		} );

return false;
	},

_mouseStop: function( event ) {
		var that = this;

this.dragged = false;

$( ".ui-unselecting", this.element[ 0 ] ).each( function() {
			var selectee = $.data( this, "selectable-item" );
			that._removeClass( selectee.$element, "ui-unselecting" );
			selectee.unselecting = false;
			selectee.startselected = false;
			that._trigger( "unselected", event, {
				unselected: selectee.element
			} );
		} );
		$( ".ui-selecting", this.element[ 0 ] ).each( function() {
			var selectee = $.data( this, "selectable-item" );
			that._removeClass( selectee.$element, "ui-selecting" )
				._addClass( selectee.$element, "ui-selected" );
			selectee.selecting = false;
			selectee.selected = true;
			selectee.startselected = true;
			that._trigger( "selected", event, {
				selected: selectee.element
			} );
		} );
		this._trigger( "stop", event );

this.helper.remove();

return false;
	}

} );

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Editing: selectable.js

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