# all files / src/toolgroups/ ListToolGroup.js

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     /**
     * ListToolGroups are one of three types of {@link OO.ui.ToolGroup toolgroups} that are used to
     * create {@link OO.ui.Toolbar toolbars} (the other types of groups are {@link OO.ui.MenuToolGroup MenuToolGroup}
     * and {@link OO.ui.BarToolGroup BarToolGroup}). The {@link OO.ui.Tool tools} in a ListToolGroup are displayed
     * by label in a dropdown menu. The title of the tool is used as the label text. The menu itself can be configured
     * with a label, icon, indicator, header, and title.
     *
     * ListToolGroups can be configured to be expanded and collapsed. Collapsed lists will have a ‘More’ option that
     * users can select to see the full list of tools. If a collapsed toolgroup is expanded, a ‘Fewer’ option permits
     * users to collapse the list again.
     *
     * ListToolGroups are created by a {@link OO.ui.ToolGroupFactory toolgroup factory} when the toolbar is set up. The factory
     * requires the ListToolGroup's symbolic name, 'list', which is specified along with the other configurations. For more
     * information about how to add tools to a ListToolGroup, please see {@link OO.ui.ToolGroup toolgroup}.
     *
     *     @example
     *     // Example of a ListToolGroup
     *     var toolFactory = new OO.ui.ToolFactory();
     *     var toolGroupFactory = new OO.ui.ToolGroupFactory();
     *     var toolbar = new OO.ui.Toolbar( toolFactory, toolGroupFactory );
     *
     *     // Configure and register two tools
     *     function SettingsTool() {
     *         SettingsTool.parent.apply( this, arguments );
     *     }
     *     OO.inheritClass( SettingsTool, OO.ui.Tool );
     *     SettingsTool.static.name = 'settings';
     *     SettingsTool.static.icon = 'settings';
     *     SettingsTool.static.title = 'Change settings';
     *     SettingsTool.prototype.onSelect = function () {
     *         this.setActive( false );
     *     };
     *     SettingsTool.prototype.onUpdateState = function () {};
     *     toolFactory.register( SettingsTool );
     *     // Register two more tools, nothing interesting here
     *     function StuffTool() {
     *         StuffTool.parent.apply( this, arguments );
     *     }
     *     OO.inheritClass( StuffTool, OO.ui.Tool );
     *     StuffTool.static.name = 'stuff';
     *     StuffTool.static.icon = 'search';
     *     StuffTool.static.title = 'Change the world';
     *     StuffTool.prototype.onSelect = function () {
     *         this.setActive( false );
     *     };
     *     StuffTool.prototype.onUpdateState = function () {};
     *     toolFactory.register( StuffTool );
     *     toolbar.setup( [
     *         {
     *             // Configurations for list toolgroup.
     *             type: 'list',
     *             label: 'ListToolGroup',
     *             icon: 'ellipsis',
     *             title: 'This is the title, displayed when user moves the mouse over the list toolgroup',
     *             header: 'This is the header',
     *             include: [ 'settings', 'stuff' ],
     *             allowCollapse: ['stuff']
     *         }
     *     ] );
     *
     *     // Create some UI around the toolbar and place it in the document
     *     var frame = new OO.ui.PanelLayout( {
     *         expanded: false,
     *         framed: true
     *     } );
     *     frame.$element.append(
     *         toolbar.$element
     *     );
     *     $( 'body' ).append( frame.$element );
     *     // Build the toolbar. This must be done after the toolbar has been appended to the document.
     *     toolbar.initialize();
     *
     * For more information about toolbars in general, please see the [OOjs UI documentation on MediaWiki][1].
     *
     * [1]: https://www.mediawiki.org/wiki/OOjs_UI/Toolbars
     *
     * @class
     * @extends OO.ui.PopupToolGroup
     *
     * @constructor
     * @param {OO.ui.Toolbar} toolbar
     * @param {Object} [config] Configuration options
     * @cfg {Array} [allowCollapse] Allow the specified tools to be collapsed. By default, collapsible tools
     *  will only be displayed if users click the ‘More’ option displayed at the bottom of the list. If
     *  the list is expanded, a ‘Fewer’ option permits users to collapse the list again. Any tools that
     *  are included in the toolgroup, but are not designated as collapsible, will always be displayed.
     *  To open a collapsible list in its expanded state, set #expanded to 'true'.
     * @cfg {Array} [forceExpand] Expand the specified tools. All other tools will be designated as collapsible.
     *  Unless #expanded is set to true, the collapsible tools will be collapsed when the list is first opened.
     * @cfg {boolean} [expanded=false] Expand collapsible tools. This config is only relevant if tools have
     *  been designated as collapsible. When expanded is set to true, all tools in the group will be displayed
     *  when the list is first opened. Users can collapse the list with a ‘Fewer’ option at the bottom.
     */
    OO.ui.ListToolGroup = function OoUiListToolGroup( toolbar, config ) {
    	// Allow passing positional parameters inside the config object
    	if ( OO.isPlainObject( toolbar ) && config === undefined ) {
    		config = toolbar;
    		toolbar = config.toolbar;
    	}

    	// Configuration initialization
    	config = config || {};

    	// Properties (must be set before parent constructor, which calls #populate)
    	this.allowCollapse = config.allowCollapse;
    	this.forceExpand = config.forceExpand;
    	this.expanded = config.expanded !== undefined ? config.expanded : false;
    	this.collapsibleTools = [];

    	// Parent constructor
    	OO.ui.ListToolGroup.parent.call( this, toolbar, config );

    	// Initialization
    	this.$element.addClass( 'oo-ui-listToolGroup' );
    };

    /* Setup */

    OO.inheritClass( OO.ui.ListToolGroup, OO.ui.PopupToolGroup );

    /* Static Properties */

    /**
     * @static
     * @inheritdoc
     */
    OO.ui.ListToolGroup.static.name = 'list';

    /* Methods */

    /**
     * @inheritdoc
     */
    OO.ui.ListToolGroup.prototype.populate = function () {
    	var i, len, allowCollapse = [];

    	OO.ui.ListToolGroup.parent.prototype.populate.call( this );

    	// Update the list of collapsible tools
    	if ( this.allowCollapse !== undefined ) {
    		allowCollapse = this.allowCollapse;
    	} else if ( this.forceExpand !== undefined ) {
    		allowCollapse = OO.simpleArrayDifference( Object.keys( this.tools ), this.forceExpand );
    	}

    	this.collapsibleTools = [];
    	for ( i = 0, len = allowCollapse.length; i < len; i++ ) {
    		if ( this.tools[ allowCollapse[ i ] ] !== undefined ) {
    			this.collapsibleTools.push( this.tools[ allowCollapse[ i ] ] );
    		}
    	}

    	// Keep at the end, even when tools are added
    	this.$group.append( this.getExpandCollapseTool().$element );

    	this.getExpandCollapseTool().toggle( this.collapsibleTools.length !== 0 );
    	this.updateCollapsibleState();
    };

    /**
     * Get the expand/collapse tool for this group
     *
     * @return {OO.ui.Tool} Expand collapse tool
     */
    OO.ui.ListToolGroup.prototype.getExpandCollapseTool = function () {
    	var ExpandCollapseTool;
    	if ( this.expandCollapseTool === undefined ) {
    		ExpandCollapseTool = function () {
    			ExpandCollapseTool.parent.apply( this, arguments );
    		};

    		OO.inheritClass( ExpandCollapseTool, OO.ui.Tool );

    		ExpandCollapseTool.prototype.onSelect = function () {
    			this.toolGroup.expanded = !this.toolGroup.expanded;
    			this.toolGroup.updateCollapsibleState();
    			this.setActive( false );
    		};
    		ExpandCollapseTool.prototype.onUpdateState = function () {
    			// Do nothing. Tool interface requires an implementation of this function.
    		};

    		ExpandCollapseTool.static.name = 'more-fewer';

    		this.expandCollapseTool = new ExpandCollapseTool( this );
    	}
    	return this.expandCollapseTool;
    };

    /**
     * @inheritdoc
     */
    OO.ui.ListToolGroup.prototype.onMouseKeyUp = function ( e ) {
    	// Do not close the popup when the user wants to show more/fewer tools
    	if (
    		$( e.target ).closest( '.oo-ui-tool-name-more-fewer' ).length &&
    		( e.which === OO.ui.MouseButtons.LEFT || e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
    	) {
    		// HACK: Prevent the popup list from being hidden. Skip the PopupToolGroup implementation (which
    		// hides the popup list when a tool is selected) and call ToolGroup's implementation directly.
    		return OO.ui.ListToolGroup.parent.parent.prototype.onMouseKeyUp.call( this, e );
    	} else {
    		return OO.ui.ListToolGroup.parent.prototype.onMouseKeyUp.call( this, e );
    	}
    };

    OO.ui.ListToolGroup.prototype.updateCollapsibleState = function () {
    	var i, len;

    	this.getExpandCollapseTool()
    		.setIcon( this.expanded ? 'collapse' : 'expand' )
    		.setTitle( OO.ui.msg( this.expanded ? 'ooui-toolgroup-collapse' : 'ooui-toolgroup-expand' ) );

    	for ( i = 0, len = this.collapsibleTools.length; i < len; i++ ) {
    		this.collapsibleTools[ i ].toggle( this.expanded );
    	}

    	// Re-evaluate clipping, because our height has changed
    	this.clip();
    };