# all files / src/widgets/ SelectWidget.js

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13.47% Branches 26/193
28.89% Functions 13/45
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     /**
     * A SelectWidget is of a generic selection of options. The OOUI library contains several types of
     * select widgets, including {@link OO.ui.ButtonSelectWidget button selects},
     * {@link OO.ui.RadioSelectWidget radio selects}, and {@link OO.ui.MenuSelectWidget
     * menu selects}.
     *
     * This class should be used together with OO.ui.OptionWidget or OO.ui.DecoratedOptionWidget. For more
     * information, please see the [OOUI documentation on MediaWiki][1].
     *
     *     @example
     *     // Example of a select widget with three options
     *     var select = new OO.ui.SelectWidget( {
     *         items: [
     *             new OO.ui.OptionWidget( {
     *                 data: 'a',
     *                 label: 'Option One',
     *             } ),
     *             new OO.ui.OptionWidget( {
     *                 data: 'b',
     *                 label: 'Option Two',
     *             } ),
     *             new OO.ui.OptionWidget( {
     *                 data: 'c',
     *                 label: 'Option Three',
     *             } )
     *         ]
     *     } );
     *     $( 'body' ).append( select.$element );
     *
     * [1]: https://www.mediawiki.org/wiki/OOUI/Widgets/Selects_and_Options
     *
     * @abstract
     * @class
     * @extends OO.ui.Widget
     * @mixins OO.ui.mixin.GroupWidget
     *
     * @constructor
     * @param {Object} [config] Configuration options
     * @cfg {OO.ui.OptionWidget[]} [items] An array of options to add to the select.
     *  Options are created with {@link OO.ui.OptionWidget OptionWidget} classes. See
     *  the [OOUI documentation on MediaWiki] [2] for examples.
     *  [2]: https://www.mediawiki.org/wiki/OOUI/Widgets/Selects_and_Options
     */
    OO.ui.SelectWidget = function OoUiSelectWidget( config ) {
    	// Configuration initialization
    	config = config || {};

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

    	// Mixin constructors
    	OO.ui.mixin.GroupWidget.call( this, $.extend( {}, config, { $group: this.$element } ) );

    	// Properties
    	this.pressed = false;
    	this.selecting = null;
    	this.onDocumentMouseUpHandler = this.onDocumentMouseUp.bind( this );
    	this.onDocumentMouseMoveHandler = this.onDocumentMouseMove.bind( this );
    	this.onDocumentKeyDownHandler = this.onDocumentKeyDown.bind( this );
    	this.onDocumentKeyPressHandler = this.onDocumentKeyPress.bind( this );
    	this.keyPressBuffer = '';
    	this.keyPressBufferTimer = null;
    	this.blockMouseOverEvents = 0;

    	// Events
    	this.connect( this, {
    		toggle: 'onToggle'
    	} );
    	this.$element.on( {
    		focusin: this.onFocus.bind( this ),
    		mousedown: this.onMouseDown.bind( this ),
    		mouseover: this.onMouseOver.bind( this ),
    		mouseleave: this.onMouseLeave.bind( this )
    	} );

    	// Initialization
    	this.$element
    		.addClass( 'oo-ui-selectWidget oo-ui-selectWidget-depressed' )
    		.attr( 'role', 'listbox' );
    	this.setFocusOwner( this.$element );
    	if ( Array.isArray( config.items ) ) {
    		this.addItems( config.items );
    	}
    };

    /* Setup */

    OO.inheritClass( OO.ui.SelectWidget, OO.ui.Widget );
    OO.mixinClass( OO.ui.SelectWidget, OO.ui.mixin.GroupWidget );

    /* Events */

    /**
     * @event highlight
     *
     * A `highlight` event is emitted when the highlight is changed with the #highlightItem method.
     *
     * @param {OO.ui.OptionWidget|null} item Highlighted item
     */

    /**
     * @event press
     *
     * A `press` event is emitted when the #pressItem method is used to programmatically modify the
     * pressed state of an option.
     *
     * @param {OO.ui.OptionWidget|null} item Pressed item
     */

    /**
     * @event select
     *
     * A `select` event is emitted when the selection is modified programmatically with the #selectItem method.
     *
     * @param {OO.ui.OptionWidget|null} item Selected item
     */

    /**
     * @event choose
     * A `choose` event is emitted when an item is chosen with the #chooseItem method.
     * @param {OO.ui.OptionWidget} item Chosen item
     */

    /**
     * @event add
     *
     * An `add` event is emitted when options are added to the select with the #addItems method.
     *
     * @param {OO.ui.OptionWidget[]} items Added items
     * @param {number} index Index of insertion point
     */

    /**
     * @event remove
     *
     * A `remove` event is emitted when options are removed from the select with the #clearItems
     * or #removeItems methods.
     *
     * @param {OO.ui.OptionWidget[]} items Removed items
     */

    /* Methods */

    /**
     * Handle focus events
     *
     * @private
     * @param {jQuery.Event} event
     */
    OO.ui.SelectWidget.prototype.onFocus = function ( event ) {
    	var item;
    	if ( event.target === this.$element[ 0 ] ) {
    		// This widget was focussed, e.g. by the user tabbing to it.
    		// The styles for focus state depend on one of the items being selected.
    		if ( !this.findSelectedItem() ) {
    			item = this.findFirstSelectableItem();
    		}
    	} else {
    		if ( event.target.tabIndex === -1 ) {
    			// One of the options got focussed (and the event bubbled up here).
    			// They can't be tabbed to, but they can be activated using accesskeys.
    			// OptionWidgets and focusable UI elements inside them have tabindex="-1" set.
    			item = this.findTargetItem( event );
    		} else {
    			// There is something actually user-focusable in one of the labels of the options, and the
    			// user focussed it (e.g. by tabbing to it). Do nothing (especially, don't change the focus).
    			return;
    		}
    	}

    	if ( item ) {
    		if ( item.constructor.static.highlightable ) {
    			this.highlightItem( item );
    		} else {
    			this.selectItem( item );
    		}
    	}

    	if ( event.target !== this.$element[ 0 ] ) {
    		this.$focusOwner.focus();
    	}
    };

    /**
     * Handle mouse down events.
     *
     * @private
     * @param {jQuery.Event} e Mouse down event
     */
    OO.ui.SelectWidget.prototype.onMouseDown = function ( e ) {
    	var item;

    	if ( !this.isDisabled() && e.which === OO.ui.MouseButtons.LEFT ) {
    		this.togglePressed( true );
    		item = this.findTargetItem( e );
    		if ( item && item.isSelectable() ) {
    			this.pressItem( item );
    			this.selecting = item;
    			this.getElementDocument().addEventListener( 'mouseup', this.onDocumentMouseUpHandler, true );
    			this.getElementDocument().addEventListener( 'mousemove', this.onDocumentMouseMoveHandler, true );
    		}
    	}
    	return false;
    };

    /**
     * Handle document mouse up events.
     *
     * @private
     * @param {MouseEvent} e Mouse up event
     */
    OO.ui.SelectWidget.prototype.onDocumentMouseUp = function ( e ) {
    	var item;

    	this.togglePressed( false );
    	if ( !this.selecting ) {
    		item = this.findTargetItem( e );
    		if ( item && item.isSelectable() ) {
    			this.selecting = item;
    		}
    	}
    	if ( !this.isDisabled() && e.which === OO.ui.MouseButtons.LEFT && this.selecting ) {
    		this.pressItem( null );
    		this.chooseItem( this.selecting );
    		this.selecting = null;
    	}

    	this.getElementDocument().removeEventListener( 'mouseup', this.onDocumentMouseUpHandler, true );
    	this.getElementDocument().removeEventListener( 'mousemove', this.onDocumentMouseMoveHandler, true );

    	return false;
    };

    // Deprecated alias since 0.28.3
    OO.ui.SelectWidget.prototype.onMouseUp = function () {
    	OO.ui.warnDeprecation( 'onMouseUp is deprecated, use onDocumentMouseUp instead' );
    	this.onDocumentMouseUp.apply( this, arguments );
    };

    /**
     * Handle document mouse move events.
     *
     * @private
     * @param {MouseEvent} e Mouse move event
     */
    OO.ui.SelectWidget.prototype.onDocumentMouseMove = function ( e ) {
    	var item;

    	if ( !this.isDisabled() && this.pressed ) {
    		item = this.findTargetItem( e );
    		if ( item && item !== this.selecting && item.isSelectable() ) {
    			this.pressItem( item );
    			this.selecting = item;
    		}
    	}
    };

    // Deprecated alias since 0.28.3
    OO.ui.SelectWidget.prototype.onMouseMove = function () {
    	OO.ui.warnDeprecation( 'onMouseMove is deprecated, use onDocumentMouseMove instead' );
    	this.onDocumentMouseMove.apply( this, arguments );
    };

    /**
     * Handle mouse over events.
     *
     * @private
     * @param {jQuery.Event} e Mouse over event
     */
    OO.ui.SelectWidget.prototype.onMouseOver = function ( e ) {
    	var item;
    	if ( this.blockMouseOverEvents ) {
    		return;
    	}
    	if ( !this.isDisabled() ) {
    		item = this.findTargetItem( e );
    		this.highlightItem( item && item.isHighlightable() ? item : null );
    	}
    	return false;
    };

    /**
     * Handle mouse leave events.
     *
     * @private
     * @param {jQuery.Event} e Mouse over event
     */
    OO.ui.SelectWidget.prototype.onMouseLeave = function () {
    	if ( !this.isDisabled() ) {
    		this.highlightItem( null );
    	}
    	return false;
    };

    /**
     * Handle document key down events.
     *
     * @protected
     * @param {KeyboardEvent} e Key down event
     */
    OO.ui.SelectWidget.prototype.onDocumentKeyDown = function ( e ) {
    	var nextItem,
    		handled = false,
    		currentItem = this.findHighlightedItem() || this.findSelectedItem();

    	if ( !this.isDisabled() && this.isVisible() ) {
    		switch ( e.keyCode ) {
    			case OO.ui.Keys.ENTER:
    				if ( currentItem && currentItem.constructor.static.highlightable ) {
    					// Was only highlighted, now let's select it. No-op if already selected.
    					this.chooseItem( currentItem );
    					handled = true;
    				}
    				break;
    			case OO.ui.Keys.UP:
    			case OO.ui.Keys.LEFT:
    				this.clearKeyPressBuffer();
    				nextItem = this.findRelativeSelectableItem( currentItem, -1 );
    				handled = true;
    				break;
    			case OO.ui.Keys.DOWN:
    			case OO.ui.Keys.RIGHT:
    				this.clearKeyPressBuffer();
    				nextItem = this.findRelativeSelectableItem( currentItem, 1 );
    				handled = true;
    				break;
    			case OO.ui.Keys.ESCAPE:
    			case OO.ui.Keys.TAB:
    				if ( currentItem && currentItem.constructor.static.highlightable ) {
    					currentItem.setHighlighted( false );
    				}
    				this.unbindDocumentKeyDownListener();
    				this.unbindDocumentKeyPressListener();
    				// Don't prevent tabbing away / defocusing
    				handled = false;
    				break;
    		}

    		if ( nextItem ) {
    			if ( nextItem.constructor.static.highlightable ) {
    				this.highlightItem( nextItem );
    			} else {
    				this.chooseItem( nextItem );
    			}
    			this.scrollItemIntoView( nextItem );
    		}

    		if ( handled ) {
    			e.preventDefault();
    			e.stopPropagation();
    		}
    	}
    };

    // Deprecated alias since 0.28.3
    OO.ui.SelectWidget.prototype.onKeyDown = function () {
    	OO.ui.warnDeprecation( 'onKeyDown is deprecated, use onDocumentKeyDown instead' );
    	this.onDocumentKeyDown.apply( this, arguments );
    };

    /**
     * Bind document key down listener.
     *
     * @protected
     */
    OO.ui.SelectWidget.prototype.bindDocumentKeyDownListener = function () {
    	this.getElementDocument().addEventListener( 'keydown', this.onDocumentKeyDownHandler, true );
    };

    // Deprecated alias since 0.28.3
    OO.ui.SelectWidget.prototype.bindKeyDownListener = function () {
    	OO.ui.warnDeprecation( 'bindKeyDownListener is deprecated, use bindDocumentKeyDownListener instead' );
    	this.bindDocumentKeyDownListener.apply( this, arguments );
    };

    /**
     * Unbind document key down listener.
     *
     * @protected
     */
    OO.ui.SelectWidget.prototype.unbindDocumentKeyDownListener = function () {
    	this.getElementDocument().removeEventListener( 'keydown', this.onDocumentKeyDownHandler, true );
    };

    // Deprecated alias since 0.28.3
    OO.ui.SelectWidget.prototype.unbindKeyDownListener = function () {
    	OO.ui.warnDeprecation( 'unbindKeyDownListener is deprecated, use unbindDocumentKeyDownListener instead' );
    	this.unbindDocumentKeyDownListener.apply( this, arguments );
    };

    /**
     * Scroll item into view, preventing spurious mouse highlight actions from happening.
     *
     * @param {OO.ui.OptionWidget} item Item to scroll into view
     */
    OO.ui.SelectWidget.prototype.scrollItemIntoView = function ( item ) {
    	var widget = this;
    	// Chromium's Blink engine will generate spurious 'mouseover' events during programmatic scrolling
    	// and around 100-150 ms after it is finished.
    	this.blockMouseOverEvents++;
    	item.scrollElementIntoView().done( function () {
    		setTimeout( function () {
    			widget.blockMouseOverEvents--;
    		}, 200 );
    	} );
    };

    /**
     * Clear the key-press buffer
     *
     * @protected
     */
    OO.ui.SelectWidget.prototype.clearKeyPressBuffer = function () {
    	if ( this.keyPressBufferTimer ) {
    		clearTimeout( this.keyPressBufferTimer );
    		this.keyPressBufferTimer = null;
    	}
    	this.keyPressBuffer = '';
    };

    /**
     * Handle key press events.
     *
     * @protected
     * @param {KeyboardEvent} e Key press event
     */
    OO.ui.SelectWidget.prototype.onDocumentKeyPress = function ( e ) {
    	var c, filter, item;

    	if ( !e.charCode ) {
    		if ( e.keyCode === OO.ui.Keys.BACKSPACE && this.keyPressBuffer !== '' ) {
    			this.keyPressBuffer = this.keyPressBuffer.substr( 0, this.keyPressBuffer.length - 1 );
    			return false;
    		}
    		return;
    	}
    	if ( String.fromCodePoint ) {
    		c = String.fromCodePoint( e.charCode );
    	} else {
    		c = String.fromCharCode( e.charCode );
    	}

    	if ( this.keyPressBufferTimer ) {
    		clearTimeout( this.keyPressBufferTimer );
    	}
    	this.keyPressBufferTimer = setTimeout( this.clearKeyPressBuffer.bind( this ), 1500 );

    	item = this.findHighlightedItem() || this.findSelectedItem();

    	if ( this.keyPressBuffer === c ) {
    		// Common (if weird) special case: typing "xxxx" will cycle through all
    		// the items beginning with "x".
    		if ( item ) {
    			item = this.findRelativeSelectableItem( item, 1 );
    		}
    	} else {
    		this.keyPressBuffer += c;
    	}

    	filter = this.getItemMatcher( this.keyPressBuffer, false );
    	if ( !item || !filter( item ) ) {
    		item = this.findRelativeSelectableItem( item, 1, filter );
    	}
    	if ( item ) {
    		if ( this.isVisible() && item.constructor.static.highlightable ) {
    			this.highlightItem( item );
    		} else {
    			this.chooseItem( item );
    		}
    		this.scrollItemIntoView( item );
    	}

    	e.preventDefault();
    	e.stopPropagation();
    };

    // Deprecated alias since 0.28.3
    OO.ui.SelectWidget.prototype.onKeyPress = function () {
    	OO.ui.warnDeprecation( 'onKeyPress is deprecated, use onDocumentKeyPress instead' );
    	this.onDocumentKeyPress.apply( this, arguments );
    };

    /**
     * Get a matcher for the specific string
     *
     * @protected
     * @param {string} s String to match against items
     * @param {boolean} [exact=false] Only accept exact matches
     * @return {Function} function ( OO.ui.OptionWidget ) => boolean
     */
    OO.ui.SelectWidget.prototype.getItemMatcher = function ( s, exact ) {
    	var re;

    	Eif ( s.normalize ) {
    		s = s.normalize();
    	}
    	s = exact ? s.trim() : s.replace( /^\s+/, '' );
    	re = '^\\s*' + s.replace( /([\\{}()|.?*+\-^$[\]])/g, '\\$1' ).replace( /\s+/g, '\\s+' );
    	Eif ( exact ) {
    		re += '\\s*$';
    	}
    	re = new RegExp( re, 'i' );
    	return function ( item ) {
    		var matchText = item.getMatchText();
    		Eif ( matchText.normalize ) {
    			matchText = matchText.normalize();
    		}
    		return re.test( matchText );
    	};
    };

    /**
     * Bind document key press listener.
     *
     * @protected
     */
    OO.ui.SelectWidget.prototype.bindDocumentKeyPressListener = function () {
    	this.getElementDocument().addEventListener( 'keypress', this.onDocumentKeyPressHandler, true );
    };

    // Deprecated alias since 0.28.3
    OO.ui.SelectWidget.prototype.bindKeyPressListener = function () {
    	OO.ui.warnDeprecation( 'bindKeyPressListener is deprecated, use bindDocumentKeyPressListener instead' );
    	this.bindDocumentKeyPressListener.apply( this, arguments );
    };

    /**
     * Unbind document key down listener.
     *
     * If you override this, be sure to call this.clearKeyPressBuffer() from your
     * implementation.
     *
     * @protected
     */
    OO.ui.SelectWidget.prototype.unbindDocumentKeyPressListener = function () {
    	this.getElementDocument().removeEventListener( 'keypress', this.onDocumentKeyPressHandler, true );
    	this.clearKeyPressBuffer();
    };

    // Deprecated alias since 0.28.3
    OO.ui.SelectWidget.prototype.unbindKeyPressListener = function () {
    	OO.ui.warnDeprecation( 'unbindDocumentKeyPressListener is deprecated, use unbindDocumentKeyPressListener instead' );
    	this.unbindDocumentKeyPressListener.apply( this, arguments );
    };

    /**
     * Visibility change handler
     *
     * @protected
     * @param {boolean} visible
     */
    OO.ui.SelectWidget.prototype.onToggle = function ( visible ) {
    	if ( !visible ) {
    		this.clearKeyPressBuffer();
    	}
    };

    /**
     * Get the closest item to a jQuery.Event.
     *
     * @private
     * @param {jQuery.Event} e
     * @return {OO.ui.OptionWidget|null} Outline item widget, `null` if none was found
     */
    OO.ui.SelectWidget.prototype.findTargetItem = function ( e ) {
    	var $option = $( e.target ).closest( '.oo-ui-optionWidget' );
    	if ( !$option.closest( '.oo-ui-selectWidget' ).is( this.$element ) ) {
    		return null;
    	}
    	return $option.data( 'oo-ui-optionWidget' ) || null;
    };

    /**
     * Find selected item.
     *
     * @return {OO.ui.OptionWidget|null} Selected item, `null` if no item is selected
     */
    OO.ui.SelectWidget.prototype.findSelectedItem = function () {
    	var i, len;

    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		if ( this.items[ i ].isSelected() ) {
    			return this.items[ i ];
    		}
    	}
    	return null;
    };

    /**
     * Find highlighted item.
     *
     * @return {OO.ui.OptionWidget|null} Highlighted item, `null` if no item is highlighted
     */
    OO.ui.SelectWidget.prototype.findHighlightedItem = function () {
    	var i, len;

    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		Iif ( this.items[ i ].isHighlighted() ) {
    			return this.items[ i ];
    		}
    	}
    	return null;
    };

    /**
     * Toggle pressed state.
     *
     * Press is a state that occurs when a user mouses down on an item, but
     * has not yet let go of the mouse. The item may appear selected, but it will not be selected
     * until the user releases the mouse.
     *
     * @param {boolean} pressed An option is being pressed
     */
    OO.ui.SelectWidget.prototype.togglePressed = function ( pressed ) {
    	if ( pressed === undefined ) {
    		pressed = !this.pressed;
    	}
    	if ( pressed !== this.pressed ) {
    		this.$element
    			.toggleClass( 'oo-ui-selectWidget-pressed', pressed )
    			.toggleClass( 'oo-ui-selectWidget-depressed', !pressed );
    		this.pressed = pressed;
    	}
    };

    /**
     * Highlight an option. If the `item` param is omitted, no options will be highlighted
     * and any existing highlight will be removed. The highlight is mutually exclusive.
     *
     * @param {OO.ui.OptionWidget} [item] Item to highlight, omit for no highlight
     * @fires highlight
     * @chainable
     */
    OO.ui.SelectWidget.prototype.highlightItem = function ( item ) {
    	var i, len, highlighted,
    		changed = false;

    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		highlighted = this.items[ i ] === item;
    		if ( this.items[ i ].isHighlighted() !== highlighted ) {
    			this.items[ i ].setHighlighted( highlighted );
    			changed = true;
    		}
    	}
    	if ( changed ) {
    		if ( item ) {
    			this.$focusOwner.attr( 'aria-activedescendant', item.getElementId() );
    		} else {
    			this.$focusOwner.removeAttr( 'aria-activedescendant' );
    		}
    		this.emit( 'highlight', item );
    	}

    	return this;
    };

    /**
     * Fetch an item by its label.
     *
     * @param {string} label Label of the item to select.
     * @param {boolean} [prefix=false] Allow a prefix match, if only a single item matches
     * @return {OO.ui.Element|null} Item with equivalent label, `null` if none exists
     */
    OO.ui.SelectWidget.prototype.getItemFromLabel = function ( label, prefix ) {
    	var i, item, found,
    		len = this.items.length,
    		filter = this.getItemMatcher( label, true );

    	for ( i = 0; i < len; i++ ) {
    		item = this.items[ i ];
    		if ( item instanceof OO.ui.OptionWidget && item.isSelectable() && filter( item ) ) {
    			return item;
    		}
    	}

    	if ( prefix ) {
    		found = null;
    		filter = this.getItemMatcher( label, false );
    		for ( i = 0; i < len; i++ ) {
    			item = this.items[ i ];
    			if ( item instanceof OO.ui.OptionWidget && item.isSelectable() && filter( item ) ) {
    				if ( found ) {
    					return null;
    				}
    				found = item;
    			}
    		}
    		if ( found ) {
    			return found;
    		}
    	}

    	return null;
    };

    /**
     * Programmatically select an option by its label. If the item does not exist,
     * all options will be deselected.
     *
     * @param {string} [label] Label of the item to select.
     * @param {boolean} [prefix=false] Allow a prefix match, if only a single item matches
     * @fires select
     * @chainable
     */
    OO.ui.SelectWidget.prototype.selectItemByLabel = function ( label, prefix ) {
    	var itemFromLabel = this.getItemFromLabel( label, !!prefix );
    	if ( label === undefined || !itemFromLabel ) {
    		return this.selectItem();
    	}
    	return this.selectItem( itemFromLabel );
    };

    /**
     * Programmatically select an option by its data. If the `data` parameter is omitted,
     * or if the item does not exist, all options will be deselected.
     *
     * @param {Object|string} [data] Value of the item to select, omit to deselect all
     * @fires select
     * @chainable
     */
    OO.ui.SelectWidget.prototype.selectItemByData = function ( data ) {
    	var itemFromData = this.findItemFromData( data );
    	if ( data === undefined || !itemFromData ) {
    		return this.selectItem();
    	}
    	return this.selectItem( itemFromData );
    };

    /**
     * Programmatically select an option by its reference. If the `item` parameter is omitted,
     * all options will be deselected.
     *
     * @param {OO.ui.OptionWidget} [item] Item to select, omit to deselect all
     * @fires select
     * @chainable
     */
    OO.ui.SelectWidget.prototype.selectItem = function ( item ) {
    	var i, len, selected,
    		changed = false;

    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		selected = this.items[ i ] === item;
    		if ( this.items[ i ].isSelected() !== selected ) {
    			this.items[ i ].setSelected( selected );
    			changed = true;
    		}
    	}
    	if ( changed ) {
    		if ( item && !item.constructor.static.highlightable ) {
    			Eif ( item ) {
    				this.$focusOwner.attr( 'aria-activedescendant', item.getElementId() );
    			} else {
    				this.$focusOwner.removeAttr( 'aria-activedescendant' );
    			}
    		}
    		this.emit( 'select', item );
    	}

    	return this;
    };

    /**
     * Press an item.
     *
     * Press is a state that occurs when a user mouses down on an item, but has not
     * yet let go of the mouse. The item may appear selected, but it will not be selected until the user
     * releases the mouse.
     *
     * @param {OO.ui.OptionWidget} [item] Item to press, omit to depress all
     * @fires press
     * @chainable
     */
    OO.ui.SelectWidget.prototype.pressItem = function ( item ) {
    	var i, len, pressed,
    		changed = false;

    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		pressed = this.items[ i ] === item;
    		if ( this.items[ i ].isPressed() !== pressed ) {
    			this.items[ i ].setPressed( pressed );
    			changed = true;
    		}
    	}
    	if ( changed ) {
    		this.emit( 'press', item );
    	}

    	return this;
    };

    /**
     * Choose an item.
     *
     * Note that ‘choose’ should never be modified programmatically. A user can choose
     * an option with the keyboard or mouse and it becomes selected. To select an item programmatically,
     * use the #selectItem method.
     *
     * This method is identical to #selectItem, but may vary in subclasses that take additional action
     * when users choose an item with the keyboard or mouse.
     *
     * @param {OO.ui.OptionWidget} item Item to choose
     * @fires choose
     * @chainable
     */
    OO.ui.SelectWidget.prototype.chooseItem = function ( item ) {
    	if ( item ) {
    		this.selectItem( item );
    		this.emit( 'choose', item );
    	}

    	return this;
    };

    /**
     * Find an option by its position relative to the specified item (or to the start of the option array,
     * if item is `null`). The direction in which to search through the option array is specified with a
     * number: -1 for reverse (the default) or 1 for forward. The method will return an option, or
     * `null` if there are no options in the array.
     *
     * @param {OO.ui.OptionWidget|null} item Item to describe the start position, or `null` to start at the beginning of the array.
     * @param {number} direction Direction to move in: -1 to move backward, 1 to move forward
     * @param {Function} [filter] Only consider items for which this function returns
     *  true. Function takes an OO.ui.OptionWidget and returns a boolean.
     * @return {OO.ui.OptionWidget|null} Item at position, `null` if there are no items in the select
     */
    OO.ui.SelectWidget.prototype.findRelativeSelectableItem = function ( item, direction, filter ) {
    	var currentIndex, nextIndex, i,
    		increase = direction > 0 ? 1 : -1,
    		len = this.items.length;

    	Iif ( item instanceof OO.ui.OptionWidget ) {
    		currentIndex = this.items.indexOf( item );
    		nextIndex = ( currentIndex + increase + len ) % len;
    	} else {
    		// If no item is selected and moving forward, start at the beginning.
    		// If moving backward, start at the end.
    		nextIndex = direction > 0 ? 0 : len - 1;
    	}

    	for ( i = 0; i < len; i++ ) {
    		item = this.items[ nextIndex ];
    		Eif (
    			item instanceof OO.ui.OptionWidget && item.isSelectable() &&
    			( !filter || filter( item ) )
    		) {
    			return item;
    		}
    		nextIndex = ( nextIndex + increase + len ) % len;
    	}
    	return null;
    };

    /**
     * Find the next selectable item or `null` if there are no selectable items.
     * Disabled options and menu-section markers and breaks are not selectable.
     *
     * @return {OO.ui.OptionWidget|null} Item, `null` if there aren't any selectable items
     */
    OO.ui.SelectWidget.prototype.findFirstSelectableItem = function () {
    	return this.findRelativeSelectableItem( null, 1 );
    };

    /**
     * Add an array of options to the select. Optionally, an index number can be used to
     * specify an insertion point.
     *
     * @param {OO.ui.OptionWidget[]} items Items to add
     * @param {number} [index] Index to insert items after
     * @fires add
     * @chainable
     */
    OO.ui.SelectWidget.prototype.addItems = function ( items, index ) {
    	// Mixin method
    	OO.ui.mixin.GroupWidget.prototype.addItems.call( this, items, index );

    	// Always provide an index, even if it was omitted
    	this.emit( 'add', items, index === undefined ? this.items.length - items.length - 1 : index );

    	return this;
    };

    /**
     * Remove the specified array of options from the select. Options will be detached
     * from the DOM, not removed, so they can be reused later. To remove all options from
     * the select, you may wish to use the #clearItems method instead.
     *
     * @param {OO.ui.OptionWidget[]} items Items to remove
     * @fires remove
     * @chainable
     */
    OO.ui.SelectWidget.prototype.removeItems = function ( items ) {
    	var i, len, item;

    	// Deselect items being removed
    	for ( i = 0, len = items.length; i < len; i++ ) {
    		item = items[ i ];
    		if ( item.isSelected() ) {
    			this.selectItem( null );
    		}
    	}

    	// Mixin method
    	OO.ui.mixin.GroupWidget.prototype.removeItems.call( this, items );

    	this.emit( 'remove', items );

    	return this;
    };

    /**
     * Clear all options from the select. Options will be detached from the DOM, not removed,
     * so that they can be reused later. To remove a subset of options from the select, use
     * the #removeItems method.
     *
     * @fires remove
     * @chainable
     */
    OO.ui.SelectWidget.prototype.clearItems = function () {
    	var items = this.items.slice();

    	// Mixin method
    	OO.ui.mixin.GroupWidget.prototype.clearItems.call( this );

    	// Clear selection
    	this.selectItem( null );

    	this.emit( 'remove', items );

    	return this;
    };

    /**
     * Set the DOM element which has focus while the user is interacting with this SelectWidget.
     *
     * Currently this is just used to set `aria-activedescendant` on it.
     *
     * @protected
     * @param {jQuery} $focusOwner
     */
    OO.ui.SelectWidget.prototype.setFocusOwner = function ( $focusOwner ) {
    	this.$focusOwner = $focusOwner;
    };