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[mediawiki.git] / resources / lib / oojs-ui / oojs-ui-toolbars.js

/*!
 * OOjs UI v0.17.4
 * https://www.mediawiki.org/wiki/OOjs_UI
 *
 * Copyright 2011–2016 OOjs UI Team and other contributors.
 * Released under the MIT license
 * http://oojs.mit-license.org
 *
 * Date: 2016-05-31T21:50:52Z
 */
( function ( OO ) {

'use strict';

/**
 * Toolbars are complex interface components that permit users to easily access a variety
 * of {@link OO.ui.Tool tools} (e.g., formatting commands) and actions, which are additional commands that are
 * part of the toolbar, but not configured as tools.
 *
 * Individual tools are customized and then registered with a {@link OO.ui.ToolFactory tool factory}, which creates
 * the tools on demand. Each tool has a symbolic name (used when registering the tool), a title (e.g., ‘Insert
 * image’), and an icon.
 *
 * Individual tools are organized in {@link OO.ui.ToolGroup toolgroups}, which can be {@link OO.ui.MenuToolGroup menus}
 * of tools, {@link OO.ui.ListToolGroup lists} of tools, or a single {@link OO.ui.BarToolGroup bar} of tools.
 * The arrangement and order of the toolgroups is customized when the toolbar is set up. Tools can be presented in
 * any order, but each can only appear once in the toolbar.
 *
 * The toolbar can be synchronized with the state of the external "application", like a text
 * editor's editing area, marking tools as active/inactive (e.g. a 'bold' tool would be shown as
 * active when the text cursor was inside bolded text) or enabled/disabled (e.g. a table caption
 * tool would be disabled while the user is not editing a table). A state change is signalled by
 * emitting the {@link #event-updateState 'updateState' event}, which calls Tools'
 * {@link OO.ui.Tool#onUpdateState onUpdateState method}.
 *
 * The following is an example of a basic toolbar.
 *
 *     @example
 *     // Example of a toolbar
 *     // Create the toolbar
 *     var toolFactory = new OO.ui.ToolFactory();
 *     var toolGroupFactory = new OO.ui.ToolGroupFactory();
 *     var toolbar = new OO.ui.Toolbar( toolFactory, toolGroupFactory );
 *
 *     // We will be placing status text in this element when tools are used
 *     var $area = $( '<p>' ).text( 'Toolbar example' );
 *
 *     // Define the tools that we're going to place in our toolbar
 *
 *     // Create a class inheriting from OO.ui.Tool
 *     function SearchTool() {
 *         SearchTool.parent.apply( this, arguments );
 *     }
 *     OO.inheritClass( SearchTool, OO.ui.Tool );
 *     // Each tool must have a 'name' (used as an internal identifier, see later) and at least one
 *     // of 'icon' and 'title' (displayed icon and text).
 *     SearchTool.static.name = 'search';
 *     SearchTool.static.icon = 'search';
 *     SearchTool.static.title = 'Search...';
 *     // Defines the action that will happen when this tool is selected (clicked).
 *     SearchTool.prototype.onSelect = function () {
 *         $area.text( 'Search tool clicked!' );
 *         // Never display this tool as "active" (selected).
 *         this.setActive( false );
 *     };
 *     SearchTool.prototype.onUpdateState = function () {};
 *     // Make this tool available in our toolFactory and thus our toolbar
 *     toolFactory.register( SearchTool );
 *
 *     // Register two more tools, nothing interesting here
 *     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 () {
 *         $area.text( 'Settings tool clicked!' );
 *         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 = 'ellipsis';
 *     StuffTool.static.title = 'More stuff';
 *     StuffTool.prototype.onSelect = function () {
 *         $area.text( 'More stuff tool clicked!' );
 *         this.setActive( false );
 *     };
 *     StuffTool.prototype.onUpdateState = function () {};
 *     toolFactory.register( StuffTool );
 *
 *     // This is a PopupTool. Rather than having a custom 'onSelect' action, it will display a
 *     // little popup window (a PopupWidget).
 *     function HelpTool( toolGroup, config ) {
 *         OO.ui.PopupTool.call( this, toolGroup, $.extend( { popup: {
 *             padded: true,
 *             label: 'Help',
 *             head: true
 *         } }, config ) );
 *         this.popup.$body.append( '<p>I am helpful!</p>' );
 *     }
 *     OO.inheritClass( HelpTool, OO.ui.PopupTool );
 *     HelpTool.static.name = 'help';
 *     HelpTool.static.icon = 'help';
 *     HelpTool.static.title = 'Help';
 *     toolFactory.register( HelpTool );
 *
 *     // Finally define which tools and in what order appear in the toolbar. Each tool may only be
 *     // used once (but not all defined tools must be used).
 *     toolbar.setup( [
 *         {
 *             // 'bar' tool groups display tools' icons only, side-by-side.
 *             type: 'bar',
 *             include: [ 'search', 'help' ]
 *         },
 *         {
 *             // 'list' tool groups display both the titles and icons, in a dropdown list.
 *             type: 'list',
 *             indicator: 'down',
 *             label: 'More',
 *             include: [ 'settings', 'stuff' ]
 *         }
 *         // Note how the tools themselves are toolgroup-agnostic - the same tool can be displayed
 *         // either in a 'list' or a 'bar'. There is a 'menu' tool group too, not showcased here,
 *         // since it's more complicated to use. (See the next example snippet on this page.)
 *     ] );
 *
 *     // Create some UI around the toolbar and place it in the document
 *     var frame = new OO.ui.PanelLayout( {
 *         expanded: false,
 *         framed: true
 *     } );
 *     var contentFrame = new OO.ui.PanelLayout( {
 *         expanded: false,
 *         padded: true
 *     } );
 *     frame.$element.append(
 *         toolbar.$element,
 *         contentFrame.$element.append( $area )
 *     );
 *     $( 'body' ).append( frame.$element );
 *
 *     // Here is where the toolbar is actually built. This must be done after inserting it into the
 *     // document.
 *     toolbar.initialize();
 *     toolbar.emit( 'updateState' );
 *
 * The following example extends the previous one to illustrate 'menu' toolgroups and the usage of
 * {@link #event-updateState 'updateState' event}.
 *
 *     @example
 *     // Create the toolbar
 *     var toolFactory = new OO.ui.ToolFactory();
 *     var toolGroupFactory = new OO.ui.ToolGroupFactory();
 *     var toolbar = new OO.ui.Toolbar( toolFactory, toolGroupFactory );
 *
 *     // We will be placing status text in this element when tools are used
 *     var $area = $( '<p>' ).text( 'Toolbar example' );
 *
 *     // Define the tools that we're going to place in our toolbar
 *
 *     // Create a class inheriting from OO.ui.Tool
 *     function SearchTool() {
 *         SearchTool.parent.apply( this, arguments );
 *     }
 *     OO.inheritClass( SearchTool, OO.ui.Tool );
 *     // Each tool must have a 'name' (used as an internal identifier, see later) and at least one
 *     // of 'icon' and 'title' (displayed icon and text).
 *     SearchTool.static.name = 'search';
 *     SearchTool.static.icon = 'search';
 *     SearchTool.static.title = 'Search...';
 *     // Defines the action that will happen when this tool is selected (clicked).
 *     SearchTool.prototype.onSelect = function () {
 *         $area.text( 'Search tool clicked!' );
 *         // Never display this tool as "active" (selected).
 *         this.setActive( false );
 *     };
 *     SearchTool.prototype.onUpdateState = function () {};
 *     // Make this tool available in our toolFactory and thus our toolbar
 *     toolFactory.register( SearchTool );
 *
 *     // Register two more tools, nothing interesting here
 *     function SettingsTool() {
 *         SettingsTool.parent.apply( this, arguments );
 *         this.reallyActive = false;
 *     }
 *     OO.inheritClass( SettingsTool, OO.ui.Tool );
 *     SettingsTool.static.name = 'settings';
 *     SettingsTool.static.icon = 'settings';
 *     SettingsTool.static.title = 'Change settings';
 *     SettingsTool.prototype.onSelect = function () {
 *         $area.text( 'Settings tool clicked!' );
 *         // Toggle the active state on each click
 *         this.reallyActive = !this.reallyActive;
 *         this.setActive( this.reallyActive );
 *         // To update the menu label
 *         this.toolbar.emit( 'updateState' );
 *     };
 *     SettingsTool.prototype.onUpdateState = function () {};
 *     toolFactory.register( SettingsTool );
 *
 *     // Register two more tools, nothing interesting here
 *     function StuffTool() {
 *         StuffTool.parent.apply( this, arguments );
 *         this.reallyActive = false;
 *     }
 *     OO.inheritClass( StuffTool, OO.ui.Tool );
 *     StuffTool.static.name = 'stuff';
 *     StuffTool.static.icon = 'ellipsis';
 *     StuffTool.static.title = 'More stuff';
 *     StuffTool.prototype.onSelect = function () {
 *         $area.text( 'More stuff tool clicked!' );
 *         // Toggle the active state on each click
 *         this.reallyActive = !this.reallyActive;
 *         this.setActive( this.reallyActive );
 *         // To update the menu label
 *         this.toolbar.emit( 'updateState' );
 *     };
 *     StuffTool.prototype.onUpdateState = function () {};
 *     toolFactory.register( StuffTool );
 *
 *     // This is a PopupTool. Rather than having a custom 'onSelect' action, it will display a
 *     // little popup window (a PopupWidget). 'onUpdateState' is also already implemented.
 *     function HelpTool( toolGroup, config ) {
 *         OO.ui.PopupTool.call( this, toolGroup, $.extend( { popup: {
 *             padded: true,
 *             label: 'Help',
 *             head: true
 *         } }, config ) );
 *         this.popup.$body.append( '<p>I am helpful!</p>' );
 *     }
 *     OO.inheritClass( HelpTool, OO.ui.PopupTool );
 *     HelpTool.static.name = 'help';
 *     HelpTool.static.icon = 'help';
 *     HelpTool.static.title = 'Help';
 *     toolFactory.register( HelpTool );
 *
 *     // Finally define which tools and in what order appear in the toolbar. Each tool may only be
 *     // used once (but not all defined tools must be used).
 *     toolbar.setup( [
 *         {
 *             // 'bar' tool groups display tools' icons only, side-by-side.
 *             type: 'bar',
 *             include: [ 'search', 'help' ]
 *         },
 *         {
 *             // 'menu' tool groups display both the titles and icons, in a dropdown menu.
 *             // Menu label indicates which items are selected.
 *             type: 'menu',
 *             indicator: 'down',
 *             include: [ 'settings', 'stuff' ]
 *         }
 *     ] );
 *
 *     // Create some UI around the toolbar and place it in the document
 *     var frame = new OO.ui.PanelLayout( {
 *         expanded: false,
 *         framed: true
 *     } );
 *     var contentFrame = new OO.ui.PanelLayout( {
 *         expanded: false,
 *         padded: true
 *     } );
 *     frame.$element.append(
 *         toolbar.$element,
 *         contentFrame.$element.append( $area )
 *     );
 *     $( 'body' ).append( frame.$element );
 *
 *     // Here is where the toolbar is actually built. This must be done after inserting it into the
 *     // document.
 *     toolbar.initialize();
 *     toolbar.emit( 'updateState' );
 *
 * @class
 * @extends OO.ui.Element
 * @mixins OO.EventEmitter
 * @mixins OO.ui.mixin.GroupElement
 *
 * @constructor
 * @param {OO.ui.ToolFactory} toolFactory Factory for creating tools
 * @param {OO.ui.ToolGroupFactory} toolGroupFactory Factory for creating toolgroups
 * @param {Object} [config] Configuration options
 * @cfg {boolean} [actions] Add an actions section to the toolbar. Actions are commands that are included
 *  in the toolbar, but are not configured as tools. By default, actions are displayed on the right side of
 *  the toolbar.
 * @cfg {boolean} [shadow] Add a shadow below the toolbar.
 */
OO.ui.Toolbar = function OoUiToolbar( toolFactory, toolGroupFactory, config ) {
        // Allow passing positional parameters inside the config object
        if ( OO.isPlainObject( toolFactory ) && config === undefined ) {
                config = toolFactory;
                toolFactory = config.toolFactory;
                toolGroupFactory = config.toolGroupFactory;
        }

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

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

        // Mixin constructors
        OO.EventEmitter.call( this );
        OO.ui.mixin.GroupElement.call( this, config );

        // Properties
        this.toolFactory = toolFactory;
        this.toolGroupFactory = toolGroupFactory;
        this.groups = [];
        this.tools = {};
        this.$bar = $( '<div>' );
        this.$actions = $( '<div>' );
        this.initialized = false;
        this.onWindowResizeHandler = this.onWindowResize.bind( this );

        // Events
        this.$element
                .add( this.$bar ).add( this.$group ).add( this.$actions )
                .on( 'mousedown keydown', this.onPointerDown.bind( this ) );

        // Initialization
        this.$group.addClass( 'oo-ui-toolbar-tools' );
        if ( config.actions ) {
                this.$bar.append( this.$actions.addClass( 'oo-ui-toolbar-actions' ) );
        }
        this.$bar
                .addClass( 'oo-ui-toolbar-bar' )
                .append( this.$group, '<div style="clear:both"></div>' );
        if ( config.shadow ) {
                this.$bar.append( '<div class="oo-ui-toolbar-shadow"></div>' );
        }
        this.$element.addClass( 'oo-ui-toolbar' ).append( this.$bar );
};

/* Setup */

OO.inheritClass( OO.ui.Toolbar, OO.ui.Element );
OO.mixinClass( OO.ui.Toolbar, OO.EventEmitter );
OO.mixinClass( OO.ui.Toolbar, OO.ui.mixin.GroupElement );

/* Events */

/**
 * @event updateState
 *
 * An 'updateState' event must be emitted on the Toolbar (by calling `toolbar.emit( 'updateState' )`)
 * every time the state of the application using the toolbar changes, and an update to the state of
 * tools is required.
 *
 * @param {...Mixed} data Application-defined parameters
 */

/* Methods */

/**
 * Get the tool factory.
 *
 * @return {OO.ui.ToolFactory} Tool factory
 */
OO.ui.Toolbar.prototype.getToolFactory = function () {
        return this.toolFactory;
};

/**
 * Get the toolgroup factory.
 *
 * @return {OO.Factory} Toolgroup factory
 */
OO.ui.Toolbar.prototype.getToolGroupFactory = function () {
        return this.toolGroupFactory;
};

/**
 * Handles mouse down events.
 *
 * @private
 * @param {jQuery.Event} e Mouse down event
 */
OO.ui.Toolbar.prototype.onPointerDown = function ( e ) {
        var $closestWidgetToEvent = $( e.target ).closest( '.oo-ui-widget' ),
                $closestWidgetToToolbar = this.$element.closest( '.oo-ui-widget' );
        if ( !$closestWidgetToEvent.length || $closestWidgetToEvent[ 0 ] === $closestWidgetToToolbar[ 0 ] ) {
                return false;
        }
};

/**
 * Handle window resize event.
 *
 * @private
 * @param {jQuery.Event} e Window resize event
 */
OO.ui.Toolbar.prototype.onWindowResize = function () {
        this.$element.toggleClass(
                'oo-ui-toolbar-narrow',
                this.$bar.width() <= this.narrowThreshold
        );
};

/**
 * Sets up handles and preloads required information for the toolbar to work.
 * This must be called after it is attached to a visible document and before doing anything else.
 */
OO.ui.Toolbar.prototype.initialize = function () {
        if ( !this.initialized ) {
                this.initialized = true;
                this.narrowThreshold = this.$group.width() + this.$actions.width();
                $( this.getElementWindow() ).on( 'resize', this.onWindowResizeHandler );
                this.onWindowResize();
        }
};

/**
 * Set up the toolbar.
 *
 * The toolbar is set up with a list of toolgroup configurations that specify the type of
 * toolgroup ({@link OO.ui.BarToolGroup bar}, {@link OO.ui.MenuToolGroup menu}, or {@link OO.ui.ListToolGroup list})
 * to add and which tools to include, exclude, promote, or demote within that toolgroup. Please
 * see {@link OO.ui.ToolGroup toolgroups} for more information about including tools in toolgroups.
 *
 * @param {Object.<string,Array>} groups List of toolgroup configurations
 * @param {Array|string} [groups.include] Tools to include in the toolgroup
 * @param {Array|string} [groups.exclude] Tools to exclude from the toolgroup
 * @param {Array|string} [groups.promote] Tools to promote to the beginning of the toolgroup
 * @param {Array|string} [groups.demote] Tools to demote to the end of the toolgroup
 */
OO.ui.Toolbar.prototype.setup = function ( groups ) {
        var i, len, type, group,
                items = [],
                defaultType = 'bar';

        // Cleanup previous groups
        this.reset();

        // Build out new groups
        for ( i = 0, len = groups.length; i < len; i++ ) {
                group = groups[ i ];
                if ( group.include === '*' ) {
                        // Apply defaults to catch-all groups
                        if ( group.type === undefined ) {
                                group.type = 'list';
                        }
                        if ( group.label === undefined ) {
                                group.label = OO.ui.msg( 'ooui-toolbar-more' );
                        }
                }
                // Check type has been registered
                type = this.getToolGroupFactory().lookup( group.type ) ? group.type : defaultType;
                items.push(
                        this.getToolGroupFactory().create( type, this, group )
                );
        }
        this.addItems( items );
};

/**
 * Remove all tools and toolgroups from the toolbar.
 */
OO.ui.Toolbar.prototype.reset = function () {
        var i, len;

        this.groups = [];
        this.tools = {};
        for ( i = 0, len = this.items.length; i < len; i++ ) {
                this.items[ i ].destroy();
        }
        this.clearItems();
};

/**
 * Destroy the toolbar.
 *
 * Destroying the toolbar removes all event handlers and DOM elements that constitute the toolbar. Call
 * this method whenever you are done using a toolbar.
 */
OO.ui.Toolbar.prototype.destroy = function () {
        $( this.getElementWindow() ).off( 'resize', this.onWindowResizeHandler );
        this.reset();
        this.$element.remove();
};

/**
 * Check if the tool is available.
 *
 * Available tools are ones that have not yet been added to the toolbar.
 *
 * @param {string} name Symbolic name of tool
 * @return {boolean} Tool is available
 */
OO.ui.Toolbar.prototype.isToolAvailable = function ( name ) {
        return !this.tools[ name ];
};

/**
 * Prevent tool from being used again.
 *
 * @param {OO.ui.Tool} tool Tool to reserve
 */
OO.ui.Toolbar.prototype.reserveTool = function ( tool ) {
        this.tools[ tool.getName() ] = tool;
};

/**
 * Allow tool to be used again.
 *
 * @param {OO.ui.Tool} tool Tool to release
 */
OO.ui.Toolbar.prototype.releaseTool = function ( tool ) {
        delete this.tools[ tool.getName() ];
};

/**
 * Get accelerator label for tool.
 *
 * The OOjs UI library does not contain an accelerator system, but this is the hook for one. To
 * use an accelerator system, subclass the toolbar and override this method, which is meant to return a label
 * that describes the accelerator keys for the tool passed (by symbolic name) to the method.
 *
 * @param {string} name Symbolic name of tool
 * @return {string|undefined} Tool accelerator label if available
 */
OO.ui.Toolbar.prototype.getToolAccelerator = function () {
        return undefined;
};

/**
 * Tools, together with {@link OO.ui.ToolGroup toolgroups}, constitute {@link OO.ui.Toolbar toolbars}.
 * Each tool is configured with a static name, title, and icon and is customized with the command to carry
 * out when the tool is selected. Tools must also be registered with a {@link OO.ui.ToolFactory tool factory},
 * which creates the tools on demand.
 *
 * Every Tool subclass must implement two methods:
 *
 * - {@link #onUpdateState}
 * - {@link #onSelect}
 *
 * Tools are added to toolgroups ({@link OO.ui.ListToolGroup ListToolGroup},
 * {@link OO.ui.BarToolGroup BarToolGroup}, or {@link OO.ui.MenuToolGroup MenuToolGroup}), which determine how
 * the tool is displayed in the toolbar. See {@link OO.ui.Toolbar toolbars} for an example.
 *
 * For more information, please see the [OOjs UI documentation on MediaWiki][1].
 * [1]: https://www.mediawiki.org/wiki/OOjs_UI/Toolbars
 *
 * @abstract
 * @class
 * @extends OO.ui.Widget
 * @mixins OO.ui.mixin.IconElement
 * @mixins OO.ui.mixin.FlaggedElement
 * @mixins OO.ui.mixin.TabIndexedElement
 *
 * @constructor
 * @param {OO.ui.ToolGroup} toolGroup
 * @param {Object} [config] Configuration options
 * @cfg {string|Function} [title] Title text or a function that returns text. If this config is omitted, the value of
 *  the {@link #static-title static title} property is used.
 *
 *  The title is used in different ways depending on the type of toolgroup that contains the tool. The
 *  title is used as a tooltip if the tool is part of a {@link OO.ui.BarToolGroup bar} toolgroup, or as the label text if the tool is
 *  part of a {@link OO.ui.ListToolGroup list} or {@link OO.ui.MenuToolGroup menu} toolgroup.
 *
 *  For bar toolgroups, a description of the accelerator key is appended to the title if an accelerator key
 *  is associated with an action by the same name as the tool and accelerator functionality has been added to the application.
 *  To add accelerator key functionality, you must subclass OO.ui.Toolbar and override the {@link OO.ui.Toolbar#getToolAccelerator getToolAccelerator} method.
 */
OO.ui.Tool = function OoUiTool( toolGroup, config ) {
        // Allow passing positional parameters inside the config object
        if ( OO.isPlainObject( toolGroup ) && config === undefined ) {
                config = toolGroup;
                toolGroup = config.toolGroup;
        }

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

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

        // Properties
        this.toolGroup = toolGroup;
        this.toolbar = this.toolGroup.getToolbar();
        this.active = false;
        this.$title = $( '<span>' );
        this.$accel = $( '<span>' );
        this.$link = $( '<a>' );
        this.title = null;

        // Mixin constructors
        OO.ui.mixin.IconElement.call( this, config );
        OO.ui.mixin.FlaggedElement.call( this, config );
        OO.ui.mixin.TabIndexedElement.call( this, $.extend( {}, config, { $tabIndexed: this.$link } ) );

        // Events
        this.toolbar.connect( this, { updateState: 'onUpdateState' } );

        // Initialization
        this.$title.addClass( 'oo-ui-tool-title' );
        this.$accel
                .addClass( 'oo-ui-tool-accel' )
                .prop( {
                        // This may need to be changed if the key names are ever localized,
                        // but for now they are essentially written in English
                        dir: 'ltr',
                        lang: 'en'
                } );
        this.$link
                .addClass( 'oo-ui-tool-link' )
                .append( this.$icon, this.$title, this.$accel )
                .attr( 'role', 'button' );
        this.$element
                .data( 'oo-ui-tool', this )
                .addClass(
                        'oo-ui-tool ' + 'oo-ui-tool-name-' +
                        this.constructor.static.name.replace( /^([^\/]+)\/([^\/]+).*$/, '$1-$2' )
                )
                .toggleClass( 'oo-ui-tool-with-label', this.constructor.static.displayBothIconAndLabel )
                .append( this.$link );
        this.setTitle( config.title || this.constructor.static.title );
};

/* Setup */

OO.inheritClass( OO.ui.Tool, OO.ui.Widget );
OO.mixinClass( OO.ui.Tool, OO.ui.mixin.IconElement );
OO.mixinClass( OO.ui.Tool, OO.ui.mixin.FlaggedElement );
OO.mixinClass( OO.ui.Tool, OO.ui.mixin.TabIndexedElement );

/* Static Properties */

/**
 * @static
 * @inheritdoc
 */
OO.ui.Tool.static.tagName = 'span';

/**
 * Symbolic name of tool.
 *
 * The symbolic name is used internally to register the tool with a {@link OO.ui.ToolFactory ToolFactory}. It can
 * also be used when adding tools to toolgroups.
 *
 * @abstract
 * @static
 * @inheritable
 * @property {string}
 */
OO.ui.Tool.static.name = '';

/**
 * Symbolic name of the group.
 *
 * The group name is used to associate tools with each other so that they can be selected later by
 * a {@link OO.ui.ToolGroup toolgroup}.
 *
 * @abstract
 * @static
 * @inheritable
 * @property {string}
 */
OO.ui.Tool.static.group = '';

/**
 * Tool title text or a function that returns title text. The value of the static property is overridden if the #title config option is used.
 *
 * @abstract
 * @static
 * @inheritable
 * @property {string|Function}
 */
OO.ui.Tool.static.title = '';

/**
 * Display both icon and label when the tool is used in a {@link OO.ui.BarToolGroup bar} toolgroup.
 * Normally only the icon is displayed, or only the label if no icon is given.
 *
 * @static
 * @inheritable
 * @property {boolean}
 */
OO.ui.Tool.static.displayBothIconAndLabel = false;

/**
 * Add tool to catch-all groups automatically.
 *
 * A catch-all group, which contains all tools that do not currently belong to a toolgroup,
 * can be included in a toolgroup using the wildcard selector, an asterisk (*).
 *
 * @static
 * @inheritable
 * @property {boolean}
 */
OO.ui.Tool.static.autoAddToCatchall = true;

/**
 * Add tool to named groups automatically.
 *
 * By default, tools that are configured with a static ‘group’ property are added
 * to that group and will be selected when the symbolic name of the group is specified (e.g., when
 * toolgroups include tools by group name).
 *
 * @static
 * @property {boolean}
 * @inheritable
 */
OO.ui.Tool.static.autoAddToGroup = true;

/**
 * Check if this tool is compatible with given data.
 *
 * This is a stub that can be overridden to provide support for filtering tools based on an
 * arbitrary piece of information  (e.g., where the cursor is in a document). The implementation
 * must also call this method so that the compatibility check can be performed.
 *
 * @static
 * @inheritable
 * @param {Mixed} data Data to check
 * @return {boolean} Tool can be used with data
 */
OO.ui.Tool.static.isCompatibleWith = function () {
        return false;
};

/* Methods */

/**
 * Handle the toolbar state being updated. This method is called when the
 * {@link OO.ui.Toolbar#event-updateState 'updateState' event} is emitted on the
 * {@link OO.ui.Toolbar Toolbar} that uses this tool, and should set the state of this tool
 * depending on application state (usually by calling #setDisabled to enable or disable the tool,
 * or #setActive to mark is as currently in-use or not).
 *
 * This is an abstract method that must be overridden in a concrete subclass.
 *
 * @method
 * @protected
 * @abstract
 */
OO.ui.Tool.prototype.onUpdateState = null;

/**
 * Handle the tool being selected. This method is called when the user triggers this tool,
 * usually by clicking on its label/icon.
 *
 * This is an abstract method that must be overridden in a concrete subclass.
 *
 * @method
 * @protected
 * @abstract
 */
OO.ui.Tool.prototype.onSelect = null;

/**
 * Check if the tool is active.
 *
 * Tools become active when their #onSelect or #onUpdateState handlers change them to appear pressed
 * with the #setActive method. Additional CSS is applied to the tool to reflect the active state.
 *
 * @return {boolean} Tool is active
 */
OO.ui.Tool.prototype.isActive = function () {
        return this.active;
};

/**
 * Make the tool appear active or inactive.
 *
 * This method should be called within #onSelect or #onUpdateState event handlers to make the tool
 * appear pressed or not.
 *
 * @param {boolean} state Make tool appear active
 */
OO.ui.Tool.prototype.setActive = function ( state ) {
        this.active = !!state;
        if ( this.active ) {
                this.$element.addClass( 'oo-ui-tool-active' );
        } else {
                this.$element.removeClass( 'oo-ui-tool-active' );
        }
};

/**
 * Set the tool #title.
 *
 * @param {string|Function} title Title text or a function that returns text
 * @chainable
 */
OO.ui.Tool.prototype.setTitle = function ( title ) {
        this.title = OO.ui.resolveMsg( title );
        this.updateTitle();
        return this;
};

/**
 * Get the tool #title.
 *
 * @return {string} Title text
 */
OO.ui.Tool.prototype.getTitle = function () {
        return this.title;
};

/**
 * Get the tool's symbolic name.
 *
 * @return {string} Symbolic name of tool
 */
OO.ui.Tool.prototype.getName = function () {
        return this.constructor.static.name;
};

/**
 * Update the title.
 */
OO.ui.Tool.prototype.updateTitle = function () {
        var titleTooltips = this.toolGroup.constructor.static.titleTooltips,
                accelTooltips = this.toolGroup.constructor.static.accelTooltips,
                accel = this.toolbar.getToolAccelerator( this.constructor.static.name ),
                tooltipParts = [];

        this.$title.text( this.title );
        this.$accel.text( accel );

        if ( titleTooltips && typeof this.title === 'string' && this.title.length ) {
                tooltipParts.push( this.title );
        }
        if ( accelTooltips && typeof accel === 'string' && accel.length ) {
                tooltipParts.push( accel );
        }
        if ( tooltipParts.length ) {
                this.$link.attr( 'title', tooltipParts.join( ' ' ) );
        } else {
                this.$link.removeAttr( 'title' );
        }
};

/**
 * Destroy tool.
 *
 * Destroying the tool removes all event handlers and the tool’s DOM elements.
 * Call this method whenever you are done using a tool.
 */
OO.ui.Tool.prototype.destroy = function () {
        this.toolbar.disconnect( this );
        this.$element.remove();
};

/**
 * ToolGroups are collections of {@link OO.ui.Tool tools} that are used in a {@link OO.ui.Toolbar toolbar}.
 * The type of toolgroup ({@link OO.ui.ListToolGroup list}, {@link OO.ui.BarToolGroup bar}, or {@link OO.ui.MenuToolGroup menu})
 * to which a tool belongs determines how the tool is arranged and displayed in the toolbar. Toolgroups
 * themselves are created on demand with a {@link OO.ui.ToolGroupFactory toolgroup factory}.
 *
 * Toolgroups can contain individual tools, groups of tools, or all available tools, as specified
 * using the `include` config option. See OO.ui.ToolFactory#extract on documentation of the format.
 * The options `exclude`, `promote`, and `demote` support the same formats.
 *
 * See {@link OO.ui.Toolbar toolbars} for a full example. 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
 *
 * @abstract
 * @class
 * @extends OO.ui.Widget
 * @mixins OO.ui.mixin.GroupElement
 *
 * @constructor
 * @param {OO.ui.Toolbar} toolbar
 * @param {Object} [config] Configuration options
 * @cfg {Array|string} [include] List of tools to include in the toolgroup, see above.
 * @cfg {Array|string} [exclude] List of tools to exclude from the toolgroup, see above.
 * @cfg {Array|string} [promote] List of tools to promote to the beginning of the toolgroup, see above.
 * @cfg {Array|string} [demote] List of tools to demote to the end of the toolgroup, see above.
 *  This setting is particularly useful when tools have been added to the toolgroup
 *  en masse (e.g., via the catch-all selector).
 */
OO.ui.ToolGroup = function OoUiToolGroup( 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 || {};

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

        // Mixin constructors
        OO.ui.mixin.GroupElement.call( this, config );

        // Properties
        this.toolbar = toolbar;
        this.tools = {};
        this.pressed = null;
        this.autoDisabled = false;
        this.include = config.include || [];
        this.exclude = config.exclude || [];
        this.promote = config.promote || [];
        this.demote = config.demote || [];
        this.onCapturedMouseKeyUpHandler = this.onCapturedMouseKeyUp.bind( this );

        // Events
        this.$element.on( {
                mousedown: this.onMouseKeyDown.bind( this ),
                mouseup: this.onMouseKeyUp.bind( this ),
                keydown: this.onMouseKeyDown.bind( this ),
                keyup: this.onMouseKeyUp.bind( this ),
                focus: this.onMouseOverFocus.bind( this ),
                blur: this.onMouseOutBlur.bind( this ),
                mouseover: this.onMouseOverFocus.bind( this ),
                mouseout: this.onMouseOutBlur.bind( this )
        } );
        this.toolbar.getToolFactory().connect( this, { register: 'onToolFactoryRegister' } );
        this.aggregate( { disable: 'itemDisable' } );
        this.connect( this, { itemDisable: 'updateDisabled' } );

        // Initialization
        this.$group.addClass( 'oo-ui-toolGroup-tools' );
        this.$element
                .addClass( 'oo-ui-toolGroup' )
                .append( this.$group );
        this.populate();
};

/* Setup */

OO.inheritClass( OO.ui.ToolGroup, OO.ui.Widget );
OO.mixinClass( OO.ui.ToolGroup, OO.ui.mixin.GroupElement );

/* Events */

/**
 * @event update
 */

/* Static Properties */

/**
 * Show labels in tooltips.
 *
 * @static
 * @inheritable
 * @property {boolean}
 */
OO.ui.ToolGroup.static.titleTooltips = false;

/**
 * Show acceleration labels in tooltips.
 *
 * Note: The OOjs UI library does not include an accelerator system, but does contain
 * a hook for one. To use an accelerator system, subclass the {@link OO.ui.Toolbar toolbar} and
 * override the {@link OO.ui.Toolbar#getToolAccelerator getToolAccelerator} method, which is
 * meant to return a label that describes the accelerator keys for a given tool (e.g., 'Ctrl + M').
 *
 * @static
 * @inheritable
 * @property {boolean}
 */
OO.ui.ToolGroup.static.accelTooltips = false;

/**
 * Automatically disable the toolgroup when all tools are disabled
 *
 * @static
 * @inheritable
 * @property {boolean}
 */
OO.ui.ToolGroup.static.autoDisable = true;

/* Methods */

/**
 * @inheritdoc
 */
OO.ui.ToolGroup.prototype.isDisabled = function () {
        return this.autoDisabled || OO.ui.ToolGroup.parent.prototype.isDisabled.apply( this, arguments );
};

/**
 * @inheritdoc
 */
OO.ui.ToolGroup.prototype.updateDisabled = function () {
        var i, item, allDisabled = true;

        if ( this.constructor.static.autoDisable ) {
                for ( i = this.items.length - 1; i >= 0; i-- ) {
                        item = this.items[ i ];
                        if ( !item.isDisabled() ) {
                                allDisabled = false;
                                break;
                        }
                }
                this.autoDisabled = allDisabled;
        }
        OO.ui.ToolGroup.parent.prototype.updateDisabled.apply( this, arguments );
};

/**
 * Handle mouse down and key down events.
 *
 * @protected
 * @param {jQuery.Event} e Mouse down or key down event
 */
OO.ui.ToolGroup.prototype.onMouseKeyDown = function ( e ) {
        if (
                !this.isDisabled() &&
                ( e.which === OO.ui.MouseButtons.LEFT || e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
        ) {
                this.pressed = this.getTargetTool( e );
                if ( this.pressed ) {
                        this.pressed.setActive( true );
                        this.getElementDocument().addEventListener( 'mouseup', this.onCapturedMouseKeyUpHandler, true );
                        this.getElementDocument().addEventListener( 'keyup', this.onCapturedMouseKeyUpHandler, true );
                }
                return false;
        }
};

/**
 * Handle captured mouse up and key up events.
 *
 * @protected
 * @param {MouseEvent|KeyboardEvent} e Mouse up or key up event
 */
OO.ui.ToolGroup.prototype.onCapturedMouseKeyUp = function ( e ) {
        this.getElementDocument().removeEventListener( 'mouseup', this.onCapturedMouseKeyUpHandler, true );
        this.getElementDocument().removeEventListener( 'keyup', this.onCapturedMouseKeyUpHandler, true );
        // onMouseKeyUp may be called a second time, depending on where the mouse is when the button is
        // released, but since `this.pressed` will no longer be true, the second call will be ignored.
        this.onMouseKeyUp( e );
};

/**
 * Handle mouse up and key up events.
 *
 * @protected
 * @param {MouseEvent|KeyboardEvent} e Mouse up or key up event
 */
OO.ui.ToolGroup.prototype.onMouseKeyUp = function ( e ) {
        var tool = this.getTargetTool( e );

        if (
                !this.isDisabled() && this.pressed && this.pressed === tool &&
                ( e.which === OO.ui.MouseButtons.LEFT || e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
        ) {
                this.pressed.onSelect();
                this.pressed = null;
                e.preventDefault();
                e.stopPropagation();
        }

        this.pressed = null;
};

/**
 * Handle mouse over and focus events.
 *
 * @protected
 * @param {jQuery.Event} e Mouse over or focus event
 */
OO.ui.ToolGroup.prototype.onMouseOverFocus = function ( e ) {
        var tool = this.getTargetTool( e );

        if ( this.pressed && this.pressed === tool ) {
                this.pressed.setActive( true );
        }
};

/**
 * Handle mouse out and blur events.
 *
 * @protected
 * @param {jQuery.Event} e Mouse out or blur event
 */
OO.ui.ToolGroup.prototype.onMouseOutBlur = function ( e ) {
        var tool = this.getTargetTool( e );

        if ( this.pressed && this.pressed === tool ) {
                this.pressed.setActive( false );
        }
};

/**
 * Get the closest tool to a jQuery.Event.
 *
 * Only tool links are considered, which prevents other elements in the tool such as popups from
 * triggering tool group interactions.
 *
 * @private
 * @param {jQuery.Event} e
 * @return {OO.ui.Tool|null} Tool, `null` if none was found
 */
OO.ui.ToolGroup.prototype.getTargetTool = function ( e ) {
        var tool,
                $item = $( e.target ).closest( '.oo-ui-tool-link' );

        if ( $item.length ) {
                tool = $item.parent().data( 'oo-ui-tool' );
        }

        return tool && !tool.isDisabled() ? tool : null;
};

/**
 * Handle tool registry register events.
 *
 * If a tool is registered after the group is created, we must repopulate the list to account for:
 *
 * - a tool being added that may be included
 * - a tool already included being overridden
 *
 * @protected
 * @param {string} name Symbolic name of tool
 */
OO.ui.ToolGroup.prototype.onToolFactoryRegister = function () {
        this.populate();
};

/**
 * Get the toolbar that contains the toolgroup.
 *
 * @return {OO.ui.Toolbar} Toolbar that contains the toolgroup
 */
OO.ui.ToolGroup.prototype.getToolbar = function () {
        return this.toolbar;
};

/**
 * Add and remove tools based on configuration.
 */
OO.ui.ToolGroup.prototype.populate = function () {
        var i, len, name, tool,
                toolFactory = this.toolbar.getToolFactory(),
                names = {},
                add = [],
                remove = [],
                list = this.toolbar.getToolFactory().getTools(
                        this.include, this.exclude, this.promote, this.demote
                );

        // Build a list of needed tools
        for ( i = 0, len = list.length; i < len; i++ ) {
                name = list[ i ];
                if (
                        // Tool exists
                        toolFactory.lookup( name ) &&
                        // Tool is available or is already in this group
                        ( this.toolbar.isToolAvailable( name ) || this.tools[ name ] )
                ) {
                        // Hack to prevent infinite recursion via ToolGroupTool. We need to reserve the tool before
                        // creating it, but we can't call reserveTool() yet because we haven't created the tool.
                        this.toolbar.tools[ name ] = true;
                        tool = this.tools[ name ];
                        if ( !tool ) {
                                // Auto-initialize tools on first use
                                this.tools[ name ] = tool = toolFactory.create( name, this );
                                tool.updateTitle();
                        }
                        this.toolbar.reserveTool( tool );
                        add.push( tool );
                        names[ name ] = true;
                }
        }
        // Remove tools that are no longer needed
        for ( name in this.tools ) {
                if ( !names[ name ] ) {
                        this.tools[ name ].destroy();
                        this.toolbar.releaseTool( this.tools[ name ] );
                        remove.push( this.tools[ name ] );
                        delete this.tools[ name ];
                }
        }
        if ( remove.length ) {
                this.removeItems( remove );
        }
        // Update emptiness state
        if ( add.length ) {
                this.$element.removeClass( 'oo-ui-toolGroup-empty' );
        } else {
                this.$element.addClass( 'oo-ui-toolGroup-empty' );
        }
        // Re-add tools (moving existing ones to new locations)
        this.addItems( add );
        // Disabled state may depend on items
        this.updateDisabled();
};

/**
 * Destroy toolgroup.
 */
OO.ui.ToolGroup.prototype.destroy = function () {
        var name;

        this.clearItems();
        this.toolbar.getToolFactory().disconnect( this );
        for ( name in this.tools ) {
                this.toolbar.releaseTool( this.tools[ name ] );
                this.tools[ name ].disconnect( this ).destroy();
                delete this.tools[ name ];
        }
        this.$element.remove();
};

/**
 * A ToolFactory creates tools on demand. All tools ({@link OO.ui.Tool Tools}, {@link OO.ui.PopupTool PopupTools},
 * and {@link OO.ui.ToolGroupTool ToolGroupTools}) must be registered with a tool factory. Tools are
 * registered by their symbolic name. See {@link OO.ui.Toolbar toolbars} for an example.
 *
 * 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.Factory
 * @constructor
 */
OO.ui.ToolFactory = function OoUiToolFactory() {
        // Parent constructor
        OO.ui.ToolFactory.parent.call( this );
};

/* Setup */

OO.inheritClass( OO.ui.ToolFactory, OO.Factory );

/* Methods */

/**
 * Get tools from the factory
 *
 * @param {Array|string} [include] Included tools, see #extract for format
 * @param {Array|string} [exclude] Excluded tools, see #extract for format
 * @param {Array|string} [promote] Promoted tools, see #extract for format
 * @param {Array|string} [demote] Demoted tools, see #extract for format
 * @return {string[]} List of tools
 */
OO.ui.ToolFactory.prototype.getTools = function ( include, exclude, promote, demote ) {
        var i, len, included, promoted, demoted,
                auto = [],
                used = {};

        // Collect included and not excluded tools
        included = OO.simpleArrayDifference( this.extract( include ), this.extract( exclude ) );

        // Promotion
        promoted = this.extract( promote, used );
        demoted = this.extract( demote, used );

        // Auto
        for ( i = 0, len = included.length; i < len; i++ ) {
                if ( !used[ included[ i ] ] ) {
                        auto.push( included[ i ] );
                }
        }

        return promoted.concat( auto ).concat( demoted );
};

/**
 * Get a flat list of names from a list of names or groups.
 *
 * Normally, `collection` is an array of tool specifications. Tools can be specified in the
 * following ways:
 *
 * - To include an individual tool, use the symbolic name: `{ name: 'tool-name' }` or `'tool-name'`.
 * - To include all tools in a group, use the group name: `{ group: 'group-name' }`. (To assign the
 *   tool to a group, use OO.ui.Tool.static.group.)
 *
 * Alternatively, to include all tools that are not yet assigned to any other toolgroup, use the
 * catch-all selector `'*'`.
 *
 * If `used` is passed, tool names that appear as properties in this object will be considered
 * already assigned, and will not be returned even if specified otherwise. The tool names extracted
 * by this function call will be added as new properties in the object.
 *
 * @private
 * @param {Array|string} collection List of tools, see above
 * @param {Object} [used] Object containing information about used tools, see above
 * @return {string[]} List of extracted tool names
 */
OO.ui.ToolFactory.prototype.extract = function ( collection, used ) {
        var i, len, item, name, tool,
                names = [];

        if ( collection === '*' ) {
                for ( name in this.registry ) {
                        tool = this.registry[ name ];
                        if (
                                // Only add tools by group name when auto-add is enabled
                                tool.static.autoAddToCatchall &&
                                // Exclude already used tools
                                ( !used || !used[ name ] )
                        ) {
                                names.push( name );
                                if ( used ) {
                                        used[ name ] = true;
                                }
                        }
                }
        } else if ( Array.isArray( collection ) ) {
                for ( i = 0, len = collection.length; i < len; i++ ) {
                        item = collection[ i ];
                        // Allow plain strings as shorthand for named tools
                        if ( typeof item === 'string' ) {
                                item = { name: item };
                        }
                        if ( OO.isPlainObject( item ) ) {
                                if ( item.group ) {
                                        for ( name in this.registry ) {
                                                tool = this.registry[ name ];
                                                if (
                                                        // Include tools with matching group
                                                        tool.static.group === item.group &&
                                                        // Only add tools by group name when auto-add is enabled
                                                        tool.static.autoAddToGroup &&
                                                        // Exclude already used tools
                                                        ( !used || !used[ name ] )
                                                ) {
                                                        names.push( name );
                                                        if ( used ) {
                                                                used[ name ] = true;
                                                        }
                                                }
                                        }
                                // Include tools with matching name and exclude already used tools
                                } else if ( item.name && ( !used || !used[ item.name ] ) ) {
                                        names.push( item.name );
                                        if ( used ) {
                                                used[ item.name ] = true;
                                        }
                                }
                        }
                }
        }
        return names;
};

/**
 * ToolGroupFactories create {@link OO.ui.ToolGroup toolgroups} on demand. The toolgroup classes must
 * specify a symbolic name and be registered with the factory. The following classes are registered by
 * default:
 *
 * - {@link OO.ui.BarToolGroup BarToolGroups} (‘bar’)
 * - {@link OO.ui.MenuToolGroup MenuToolGroups} (‘menu’)
 * - {@link OO.ui.ListToolGroup ListToolGroups} (‘list’)
 *
 * See {@link OO.ui.Toolbar toolbars} for an example.
 *
 * 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.Factory
 * @constructor
 */
OO.ui.ToolGroupFactory = function OoUiToolGroupFactory() {
        var i, l, defaultClasses;
        // Parent constructor
        OO.Factory.call( this );

        defaultClasses = this.constructor.static.getDefaultClasses();

        // Register default toolgroups
        for ( i = 0, l = defaultClasses.length; i < l; i++ ) {
                this.register( defaultClasses[ i ] );
        }
};

/* Setup */

OO.inheritClass( OO.ui.ToolGroupFactory, OO.Factory );

/* Static Methods */

/**
 * Get a default set of classes to be registered on construction.
 *
 * @return {Function[]} Default classes
 */
OO.ui.ToolGroupFactory.static.getDefaultClasses = function () {
        return [
                OO.ui.BarToolGroup,
                OO.ui.ListToolGroup,
                OO.ui.MenuToolGroup
        ];
};

/**
 * Popup tools open a popup window when they are selected from the {@link OO.ui.Toolbar toolbar}. Each popup tool is configured
 * with a static name, title, and icon, as well with as any popup configurations. Unlike other tools, popup tools do not require that developers specify
 * an #onSelect or #onUpdateState method, as these methods have been implemented already.
 *
 *     // Example of a popup tool. When selected, a popup tool displays
 *     // a popup window.
 *     function HelpTool( toolGroup, config ) {
 *        OO.ui.PopupTool.call( this, toolGroup, $.extend( { popup: {
 *            padded: true,
 *            label: 'Help',
 *            head: true
 *        } }, config ) );
 *        this.popup.$body.append( '<p>I am helpful!</p>' );
 *     };
 *     OO.inheritClass( HelpTool, OO.ui.PopupTool );
 *     HelpTool.static.name = 'help';
 *     HelpTool.static.icon = 'help';
 *     HelpTool.static.title = 'Help';
 *     toolFactory.register( HelpTool );
 *
 * For an example of a toolbar that contains a popup tool, see {@link OO.ui.Toolbar toolbars}. For more information about
 * toolbars in genreral, please see the [OOjs UI documentation on MediaWiki][1].
 *
 * [1]: https://www.mediawiki.org/wiki/OOjs_UI/Toolbars
 *
 * @abstract
 * @class
 * @extends OO.ui.Tool
 * @mixins OO.ui.mixin.PopupElement
 *
 * @constructor
 * @param {OO.ui.ToolGroup} toolGroup
 * @param {Object} [config] Configuration options
 */
OO.ui.PopupTool = function OoUiPopupTool( toolGroup, config ) {
        // Allow passing positional parameters inside the config object
        if ( OO.isPlainObject( toolGroup ) && config === undefined ) {
                config = toolGroup;
                toolGroup = config.toolGroup;
        }

        // Parent constructor
        OO.ui.PopupTool.parent.call( this, toolGroup, config );

        // Mixin constructors
        OO.ui.mixin.PopupElement.call( this, config );

        // Initialization
        this.$element
                .addClass( 'oo-ui-popupTool' )
                .append( this.popup.$element );
};

/* Setup */

OO.inheritClass( OO.ui.PopupTool, OO.ui.Tool );
OO.mixinClass( OO.ui.PopupTool, OO.ui.mixin.PopupElement );

/* Methods */

/**
 * Handle the tool being selected.
 *
 * @inheritdoc
 */
OO.ui.PopupTool.prototype.onSelect = function () {
        if ( !this.isDisabled() ) {
                this.popup.toggle();
        }
        this.setActive( false );
        return false;
};

/**
 * Handle the toolbar state being updated.
 *
 * @inheritdoc
 */
OO.ui.PopupTool.prototype.onUpdateState = function () {
        this.setActive( false );
};

/**
 * A ToolGroupTool is a special sort of tool that can contain other {@link OO.ui.Tool tools}
 * and {@link OO.ui.ToolGroup toolgroups}. The ToolGroupTool was specifically designed to be used
 * inside a {@link OO.ui.BarToolGroup bar} toolgroup to provide access to additional tools from
 * the bar item. Included tools will be displayed in a dropdown {@link OO.ui.ListToolGroup list}
 * when the ToolGroupTool is selected.
 *
 *     // Example: ToolGroupTool with two nested tools, 'setting1' and 'setting2', defined elsewhere.
 *
 *     function SettingsTool() {
 *         SettingsTool.parent.apply( this, arguments );
 *     };
 *     OO.inheritClass( SettingsTool, OO.ui.ToolGroupTool );
 *     SettingsTool.static.name = 'settings';
 *     SettingsTool.static.title = 'Change settings';
 *     SettingsTool.static.groupConfig = {
 *         icon: 'settings',
 *         label: 'ToolGroupTool',
 *         include: [  'setting1', 'setting2'  ]
 *     };
 *     toolFactory.register( SettingsTool );
 *
 * For more information, please see the [OOjs UI documentation on MediaWiki][1].
 *
 * Please note that this implementation is subject to change per [T74159] [2].
 *
 * [1]: https://www.mediawiki.org/wiki/OOjs_UI/Toolbars#ToolGroupTool
 * [2]: https://phabricator.wikimedia.org/T74159
 *
 * @abstract
 * @class
 * @extends OO.ui.Tool
 *
 * @constructor
 * @param {OO.ui.ToolGroup} toolGroup
 * @param {Object} [config] Configuration options
 */
OO.ui.ToolGroupTool = function OoUiToolGroupTool( toolGroup, config ) {
        // Allow passing positional parameters inside the config object
        if ( OO.isPlainObject( toolGroup ) && config === undefined ) {
                config = toolGroup;
                toolGroup = config.toolGroup;
        }

        // Parent constructor
        OO.ui.ToolGroupTool.parent.call( this, toolGroup, config );

        // Properties
        this.innerToolGroup = this.createGroup( this.constructor.static.groupConfig );

        // Events
        this.innerToolGroup.connect( this, { disable: 'onToolGroupDisable' } );

        // Initialization
        this.$link.remove();
        this.$element
                .addClass( 'oo-ui-toolGroupTool' )
                .append( this.innerToolGroup.$element );
};

/* Setup */

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

/* Static Properties */

/**
 * Toolgroup configuration.
 *
 * The toolgroup configuration consists of the tools to include, as well as an icon and label
 * to use for the bar item. Tools can be included by symbolic name, group, or with the
 * wildcard selector. Please see {@link OO.ui.ToolGroup toolgroup} for more information.
 *
 * @property {Object.<string,Array>}
 */
OO.ui.ToolGroupTool.static.groupConfig = {};

/* Methods */

/**
 * Handle the tool being selected.
 *
 * @inheritdoc
 */
OO.ui.ToolGroupTool.prototype.onSelect = function () {
        this.innerToolGroup.setActive( !this.innerToolGroup.active );
        return false;
};

/**
 * Synchronize disabledness state of the tool with the inner toolgroup.
 *
 * @private
 * @param {boolean} disabled Element is disabled
 */
OO.ui.ToolGroupTool.prototype.onToolGroupDisable = function ( disabled ) {
        this.setDisabled( disabled );
};

/**
 * Handle the toolbar state being updated.
 *
 * @inheritdoc
 */
OO.ui.ToolGroupTool.prototype.onUpdateState = function () {
        this.setActive( false );
};

/**
 * Build a {@link OO.ui.ToolGroup toolgroup} from the specified configuration.
 *
 * @param {Object.<string,Array>} group Toolgroup configuration. Please see {@link OO.ui.ToolGroup toolgroup} for
 *  more information.
 * @return {OO.ui.ListToolGroup}
 */
OO.ui.ToolGroupTool.prototype.createGroup = function ( group ) {
        if ( group.include === '*' ) {
                // Apply defaults to catch-all groups
                if ( group.label === undefined ) {
                        group.label = OO.ui.msg( 'ooui-toolbar-more' );
                }
        }

        return this.toolbar.getToolGroupFactory().create( 'list', this.toolbar, group );
};

/**
 * BarToolGroups 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.ListToolGroup ListToolGroup}). The {@link OO.ui.Tool tools} in a BarToolGroup are
 * displayed by icon in a single row. The title of the tool is displayed when users move the mouse over
 * the tool.
 *
 * BarToolGroups are created by a {@link OO.ui.ToolGroupFactory tool group factory} when the toolbar is
 * set up.
 *
 *     @example
 *     // Example of a BarToolGroup with two tools
 *     var toolFactory = new OO.ui.ToolFactory();
 *     var toolGroupFactory = new OO.ui.ToolGroupFactory();
 *     var toolbar = new OO.ui.Toolbar( toolFactory, toolGroupFactory );
 *
 *     // We will be placing status text in this element when tools are used
 *     var $area = $( '<p>' ).text( 'Example of a BarToolGroup with two tools.' );
 *
 *     // Define the tools that we're going to place in our toolbar
 *
 *     // Create a class inheriting from OO.ui.Tool
 *     function SearchTool() {
 *         SearchTool.parent.apply( this, arguments );
 *     }
 *     OO.inheritClass( SearchTool, OO.ui.Tool );
 *     // Each tool must have a 'name' (used as an internal identifier, see later) and at least one
 *     // of 'icon' and 'title' (displayed icon and text).
 *     SearchTool.static.name = 'search';
 *     SearchTool.static.icon = 'search';
 *     SearchTool.static.title = 'Search...';
 *     // Defines the action that will happen when this tool is selected (clicked).
 *     SearchTool.prototype.onSelect = function () {
 *         $area.text( 'Search tool clicked!' );
 *         // Never display this tool as "active" (selected).
 *         this.setActive( false );
 *     };
 *     SearchTool.prototype.onUpdateState = function () {};
 *     // Make this tool available in our toolFactory and thus our toolbar
 *     toolFactory.register( SearchTool );
 *
 *     // This is a PopupTool. Rather than having a custom 'onSelect' action, it will display a
 *     // little popup window (a PopupWidget).
 *     function HelpTool( toolGroup, config ) {
 *         OO.ui.PopupTool.call( this, toolGroup, $.extend( { popup: {
 *             padded: true,
 *             label: 'Help',
 *             head: true
 *         } }, config ) );
 *         this.popup.$body.append( '<p>I am helpful!</p>' );
 *     }
 *     OO.inheritClass( HelpTool, OO.ui.PopupTool );
 *     HelpTool.static.name = 'help';
 *     HelpTool.static.icon = 'help';
 *     HelpTool.static.title = 'Help';
 *     toolFactory.register( HelpTool );
 *
 *     // Finally define which tools and in what order appear in the toolbar. Each tool may only be
 *     // used once (but not all defined tools must be used).
 *     toolbar.setup( [
 *         {
 *             // 'bar' tool groups display tools by icon only
 *             type: 'bar',
 *             include: [ 'search', 'help' ]
 *         }
 *     ] );
 *
 *     // Create some UI around the toolbar and place it in the document
 *     var frame = new OO.ui.PanelLayout( {
 *         expanded: false,
 *         framed: true
 *     } );
 *     var contentFrame = new OO.ui.PanelLayout( {
 *         expanded: false,
 *         padded: true
 *     } );
 *     frame.$element.append(
 *         toolbar.$element,
 *         contentFrame.$element.append( $area )
 *     );
 *     $( 'body' ).append( frame.$element );
 *
 *     // Here is where the toolbar is actually built. This must be done after inserting it into the
 *     // document.
 *     toolbar.initialize();
 *
 * For more information about how to add tools to a bar tool group, please see {@link OO.ui.ToolGroup toolgroup}.
 * 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.ToolGroup
 *
 * @constructor
 * @param {OO.ui.Toolbar} toolbar
 * @param {Object} [config] Configuration options
 */
OO.ui.BarToolGroup = function OoUiBarToolGroup( toolbar, config ) {
        // Allow passing positional parameters inside the config object
        if ( OO.isPlainObject( toolbar ) && config === undefined ) {
                config = toolbar;
                toolbar = config.toolbar;
        }

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

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

/* Setup */

OO.inheritClass( OO.ui.BarToolGroup, OO.ui.ToolGroup );

/* Static Properties */

OO.ui.BarToolGroup.static.titleTooltips = true;

OO.ui.BarToolGroup.static.accelTooltips = true;

OO.ui.BarToolGroup.static.name = 'bar';

/**
 * PopupToolGroup is an abstract base class used by both {@link OO.ui.MenuToolGroup MenuToolGroup}
 * and {@link OO.ui.ListToolGroup ListToolGroup} to provide a popup--an overlaid menu or list of tools with an
 * optional icon and label. This class can be used for other base classes that also use this functionality.
 *
 * @abstract
 * @class
 * @extends OO.ui.ToolGroup
 * @mixins OO.ui.mixin.IconElement
 * @mixins OO.ui.mixin.IndicatorElement
 * @mixins OO.ui.mixin.LabelElement
 * @mixins OO.ui.mixin.TitledElement
 * @mixins OO.ui.mixin.ClippableElement
 * @mixins OO.ui.mixin.TabIndexedElement
 *
 * @constructor
 * @param {OO.ui.Toolbar} toolbar
 * @param {Object} [config] Configuration options
 * @cfg {string} [header] Text to display at the top of the popup
 */
OO.ui.PopupToolGroup = function OoUiPopupToolGroup( 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 || {};

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

        // Properties
        this.active = false;
        this.dragging = false;
        this.onBlurHandler = this.onBlur.bind( this );
        this.$handle = $( '<span>' );

        // Mixin constructors
        OO.ui.mixin.IconElement.call( this, config );
        OO.ui.mixin.IndicatorElement.call( this, config );
        OO.ui.mixin.LabelElement.call( this, config );
        OO.ui.mixin.TitledElement.call( this, config );
        OO.ui.mixin.ClippableElement.call( this, $.extend( {}, config, { $clippable: this.$group } ) );
        OO.ui.mixin.TabIndexedElement.call( this, $.extend( {}, config, { $tabIndexed: this.$handle } ) );

        // Events
        this.$handle.on( {
                keydown: this.onHandleMouseKeyDown.bind( this ),
                keyup: this.onHandleMouseKeyUp.bind( this ),
                mousedown: this.onHandleMouseKeyDown.bind( this ),
                mouseup: this.onHandleMouseKeyUp.bind( this )
        } );

        // Initialization
        this.$handle
                .addClass( 'oo-ui-popupToolGroup-handle' )
                .append( this.$icon, this.$label, this.$indicator );
        // If the pop-up should have a header, add it to the top of the toolGroup.
        // Note: If this feature is useful for other widgets, we could abstract it into an
        // OO.ui.HeaderedElement mixin constructor.
        if ( config.header !== undefined ) {
                this.$group
                        .prepend( $( '<span>' )
                                .addClass( 'oo-ui-popupToolGroup-header' )
                                .text( config.header )
                        );
        }
        this.$element
                .addClass( 'oo-ui-popupToolGroup' )
                .prepend( this.$handle );
};

/* Setup */

OO.inheritClass( OO.ui.PopupToolGroup, OO.ui.ToolGroup );
OO.mixinClass( OO.ui.PopupToolGroup, OO.ui.mixin.IconElement );
OO.mixinClass( OO.ui.PopupToolGroup, OO.ui.mixin.IndicatorElement );
OO.mixinClass( OO.ui.PopupToolGroup, OO.ui.mixin.LabelElement );
OO.mixinClass( OO.ui.PopupToolGroup, OO.ui.mixin.TitledElement );
OO.mixinClass( OO.ui.PopupToolGroup, OO.ui.mixin.ClippableElement );
OO.mixinClass( OO.ui.PopupToolGroup, OO.ui.mixin.TabIndexedElement );

/* Methods */

/**
 * @inheritdoc
 */
OO.ui.PopupToolGroup.prototype.setDisabled = function () {
        // Parent method
        OO.ui.PopupToolGroup.parent.prototype.setDisabled.apply( this, arguments );

        if ( this.isDisabled() && this.isElementAttached() ) {
                this.setActive( false );
        }
};

/**
 * Handle focus being lost.
 *
 * The event is actually generated from a mouseup/keyup, so it is not a normal blur event object.
 *
 * @protected
 * @param {MouseEvent|KeyboardEvent} e Mouse up or key up event
 */
OO.ui.PopupToolGroup.prototype.onBlur = function ( e ) {
        // Only deactivate when clicking outside the dropdown element
        if ( $( e.target ).closest( '.oo-ui-popupToolGroup' )[ 0 ] !== this.$element[ 0 ] ) {
                this.setActive( false );
        }
};

/**
 * @inheritdoc
 */
OO.ui.PopupToolGroup.prototype.onMouseKeyUp = function ( e ) {
        // Only close toolgroup when a tool was actually selected
        if (
                !this.isDisabled() && this.pressed && this.pressed === this.getTargetTool( e ) &&
                ( e.which === OO.ui.MouseButtons.LEFT || e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
        ) {
                this.setActive( false );
        }
        return OO.ui.PopupToolGroup.parent.prototype.onMouseKeyUp.call( this, e );
};

/**
 * Handle mouse up and key up events.
 *
 * @protected
 * @param {jQuery.Event} e Mouse up or key up event
 */
OO.ui.PopupToolGroup.prototype.onHandleMouseKeyUp = function ( e ) {
        if (
                !this.isDisabled() &&
                ( e.which === OO.ui.MouseButtons.LEFT || e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
        ) {
                return false;
        }
};

/**
 * Handle mouse down and key down events.
 *
 * @protected
 * @param {jQuery.Event} e Mouse down or key down event
 */
OO.ui.PopupToolGroup.prototype.onHandleMouseKeyDown = function ( e ) {
        if (
                !this.isDisabled() &&
                ( e.which === OO.ui.MouseButtons.LEFT || e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER )
        ) {
                this.setActive( !this.active );
                return false;
        }
};

/**
 * Switch into 'active' mode.
 *
 * When active, the popup is visible. A mouseup event anywhere in the document will trigger
 * deactivation.
 */
OO.ui.PopupToolGroup.prototype.setActive = function ( value ) {
        var containerWidth, containerLeft;
        value = !!value;
        if ( this.active !== value ) {
                this.active = value;
                if ( value ) {
                        this.getElementDocument().addEventListener( 'mouseup', this.onBlurHandler, true );
                        this.getElementDocument().addEventListener( 'keyup', this.onBlurHandler, true );

                        this.$clippable.css( 'left', '' );
                        // Try anchoring the popup to the left first
                        this.$element.addClass( 'oo-ui-popupToolGroup-active oo-ui-popupToolGroup-left' );
                        this.toggleClipping( true );
                        if ( this.isClippedHorizontally() ) {
                                // Anchoring to the left caused the popup to clip, so anchor it to the right instead
                                this.toggleClipping( false );
                                this.$element
                                        .removeClass( 'oo-ui-popupToolGroup-left' )
                                        .addClass( 'oo-ui-popupToolGroup-right' );
                                this.toggleClipping( true );
                        }
                        if ( this.isClippedHorizontally() ) {
                                // Anchoring to the right also caused the popup to clip, so just make it fill the container
                                containerWidth = this.$clippableScrollableContainer.width();
                                containerLeft = this.$clippableScrollableContainer.offset().left;

                                this.toggleClipping( false );
                                this.$element.removeClass( 'oo-ui-popupToolGroup-right' );

                                this.$clippable.css( {
                                        left: -( this.$element.offset().left - containerLeft ),
                                        width: containerWidth
                                } );
                        }
                } else {
                        this.getElementDocument().removeEventListener( 'mouseup', this.onBlurHandler, true );
                        this.getElementDocument().removeEventListener( 'keyup', this.onBlurHandler, true );
                        this.$element.removeClass(
                                'oo-ui-popupToolGroup-active oo-ui-popupToolGroup-left  oo-ui-popupToolGroup-right'
                        );
                        this.toggleClipping( false );
                }
        }
};

/**
 * 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',
 *             indicator: 'down',
 *             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 */

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 );
        }
};

/**
 * MenuToolGroups 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.BarToolGroup BarToolGroup}
 * and {@link OO.ui.ListToolGroup ListToolGroup}). MenuToolGroups contain selectable {@link OO.ui.Tool tools},
 * which are displayed by label in a dropdown menu. The tool's title is used as the label text, and the
 * menu label is updated to reflect which tool or tools are currently selected. If no tools are selected,
 * the menu label is empty. The menu can be configured with an indicator, icon, title, and/or header.
 *
 * MenuToolGroups are created by a {@link OO.ui.ToolGroupFactory tool group factory} when the toolbar
 * is set up.
 *
 *     @example
 *     // Example of a MenuToolGroup
 *     var toolFactory = new OO.ui.ToolFactory();
 *     var toolGroupFactory = new OO.ui.ToolGroupFactory();
 *     var toolbar = new OO.ui.Toolbar( toolFactory, toolGroupFactory );
 *
 *     // We will be placing status text in this element when tools are used
 *     var $area = $( '<p>' ).text( 'An example of a MenuToolGroup. Select a tool from the dropdown menu.' );
 *
 *     // Define the tools that we're going to place in our toolbar
 *
 *     function SettingsTool() {
 *         SettingsTool.parent.apply( this, arguments );
 *         this.reallyActive = false;
 *     }
 *     OO.inheritClass( SettingsTool, OO.ui.Tool );
 *     SettingsTool.static.name = 'settings';
 *     SettingsTool.static.icon = 'settings';
 *     SettingsTool.static.title = 'Change settings';
 *     SettingsTool.prototype.onSelect = function () {
 *         $area.text( 'Settings tool clicked!' );
 *         // Toggle the active state on each click
 *         this.reallyActive = !this.reallyActive;
 *         this.setActive( this.reallyActive );
 *         // To update the menu label
 *         this.toolbar.emit( 'updateState' );
 *     };
 *     SettingsTool.prototype.onUpdateState = function () {};
 *     toolFactory.register( SettingsTool );
 *
 *     function StuffTool() {
 *         StuffTool.parent.apply( this, arguments );
 *         this.reallyActive = false;
 *     }
 *     OO.inheritClass( StuffTool, OO.ui.Tool );
 *     StuffTool.static.name = 'stuff';
 *     StuffTool.static.icon = 'ellipsis';
 *     StuffTool.static.title = 'More stuff';
 *     StuffTool.prototype.onSelect = function () {
 *         $area.text( 'More stuff tool clicked!' );
 *         // Toggle the active state on each click
 *         this.reallyActive = !this.reallyActive;
 *         this.setActive( this.reallyActive );
 *         // To update the menu label
 *         this.toolbar.emit( 'updateState' );
 *     };
 *     StuffTool.prototype.onUpdateState = function () {};
 *     toolFactory.register( StuffTool );
 *
 *     // Finally define which tools and in what order appear in the toolbar. Each tool may only be
 *     // used once (but not all defined tools must be used).
 *     toolbar.setup( [
 *         {
 *             type: 'menu',
 *             header: 'This is the (optional) header',
 *             title: 'This is the (optional) title',
 *             indicator: 'down',
 *             include: [ 'settings', 'stuff' ]
 *         }
 *     ] );
 *
 *     // Create some UI around the toolbar and place it in the document
 *     var frame = new OO.ui.PanelLayout( {
 *         expanded: false,
 *         framed: true
 *     } );
 *     var contentFrame = new OO.ui.PanelLayout( {
 *         expanded: false,
 *         padded: true
 *     } );
 *     frame.$element.append(
 *         toolbar.$element,
 *         contentFrame.$element.append( $area )
 *     );
 *     $( 'body' ).append( frame.$element );
 *
 *     // Here is where the toolbar is actually built. This must be done after inserting it into the
 *     // document.
 *     toolbar.initialize();
 *     toolbar.emit( 'updateState' );
 *
 * For more information about how to add tools to a MenuToolGroup, please see {@link OO.ui.ToolGroup toolgroup}.
 * 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
 */
OO.ui.MenuToolGroup = function OoUiMenuToolGroup( 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 || {};

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

        // Events
        this.toolbar.connect( this, { updateState: 'onUpdateState' } );

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

/* Setup */

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

/* Static Properties */

OO.ui.MenuToolGroup.static.name = 'menu';

/* Methods */

/**
 * Handle the toolbar state being updated.
 *
 * When the state changes, the title of each active item in the menu will be joined together and
 * used as a label for the group. The label will be empty if none of the items are active.
 *
 * @private
 */
OO.ui.MenuToolGroup.prototype.onUpdateState = function () {
        var name,
                labelTexts = [];

        for ( name in this.tools ) {
                if ( this.tools[ name ].isActive() ) {
                        labelTexts.push( this.tools[ name ].getTitle() );
                }
        }

        this.setLabel( labelTexts.join( ', ' ) || ' ' );
};

}( OO ) );