# all files / src/mixins/ GroupElement.js

63.49% Statements 40/63
52.94% Branches 9/17
70% Functions 7/10
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     /**
     * Any OOjs UI widget that contains other widgets (such as {@link OO.ui.ButtonWidget buttons} or
     * {@link OO.ui.OptionWidget options}) mixes in GroupElement. Adding, removing, and clearing
     * items from the group is done through the interface the class provides.
     * For more information, please see the [OOjs UI documentation on MediaWiki] [1].
     *
     * [1]: https://www.mediawiki.org/wiki/OOjs_UI/Elements/Groups
     *
     * @abstract
     * @mixins OO.EmitterList
     * @class
     *
     * @constructor
     * @param {Object} [config] Configuration options
     * @cfg {jQuery} [$group] The container element created by the class. If this configuration
     *  is omitted, the group element will use a generated `<div>`.
     */
    OO.ui.mixin.GroupElement = function OoUiMixinGroupElement( config ) {
    	// Configuration initialization
    	config = config || {};

    	// Mixin constructors
    	OO.EmitterList.call( this, config );

    	// Properties
    	this.$group = null;

    	// Initialization
    	this.setGroupElement( config.$group || $( '<div>' ) );
    };

    /* Setup */

    OO.mixinClass( OO.ui.mixin.GroupElement, OO.EmitterList );

    /* Events */

    /**
     * @event change
     *
     * A change event is emitted when the set of selected items changes.
     *
     * @param {OO.ui.Element[]} items Items currently in the group
     */

    /* Methods */

    /**
     * Set the group element.
     *
     * If an element is already set, items will be moved to the new element.
     *
     * @param {jQuery} $group Element to use as group
     */
    OO.ui.mixin.GroupElement.prototype.setGroupElement = function ( $group ) {
    	var i, len;

    	this.$group = $group;
    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		this.$group.append( this.items[ i ].$element );
    	}
    };

    /**
     * Get an item by its data.
     *
     * Only the first item with matching data will be returned. To return all matching items,
     * use the #getItemsFromData method.
     *
     * @param {Object} data Item data to search for
     * @return {OO.ui.Element|null} Item with equivalent data, `null` if none exists
     */
    OO.ui.mixin.GroupElement.prototype.getItemFromData = function ( data ) {
    	var i, len, item,
    		hash = OO.getHash( data );

    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		item = this.items[ i ];
    		if ( hash === OO.getHash( item.getData() ) ) {
    			return item;
    		}
    	}

    	return null;
    };

    /**
     * Get items by their data.
     *
     * All items with matching data will be returned. To return only the first match, use the #getItemFromData method instead.
     *
     * @param {Object} data Item data to search for
     * @return {OO.ui.Element[]} Items with equivalent data
     */
    OO.ui.mixin.GroupElement.prototype.getItemsFromData = function ( data ) {
    	var i, len, item,
    		hash = OO.getHash( data ),
    		items = [];

    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		item = this.items[ i ];
    		if ( hash === OO.getHash( item.getData() ) ) {
    			items.push( item );
    		}
    	}

    	return items;
    };

    /**
     * Add items to the group.
     *
     * Items will be added to the end of the group array unless the optional `index` parameter specifies
     * a different insertion point. Adding an existing item will move it to the end of the array or the point specified by the `index`.
     *
     * @param {OO.ui.Element[]} items An array of items to add to the group
     * @param {number} [index] Index of the insertion point
     * @chainable
     */
    OO.ui.mixin.GroupElement.prototype.addItems = function ( items, index ) {
    	// Mixin method
    	OO.EmitterList.prototype.addItems.call( this, items, index );

    	this.emit( 'change', this.getItems() );
    	return this;
    };

    /**
     * @inheritdoc
     */
    OO.ui.mixin.GroupElement.prototype.moveItem = function ( items, newIndex ) {
    	// insertItemElements expects this.items to not have been modified yet, so call before the mixin
    	this.insertItemElements( items, newIndex );

    	// Mixin method
    	newIndex = OO.EmitterList.prototype.moveItem.call( this, items, newIndex );

    	return newIndex;
    };

    /**
     * @inheritdoc
     */
    OO.ui.mixin.GroupElement.prototype.insertItem = function ( item, index ) {
    	item.setElementGroup( this );
    	this.insertItemElements( item, index );

    	// Mixin method
    	index = OO.EmitterList.prototype.insertItem.call( this, item, index );

    	return index;
    };

    /**
     * Insert elements into the group
     *
     * @private
     * @param {OO.ui.Element} itemWidget Item to insert
     * @param {number} index Insertion index
     */
    OO.ui.mixin.GroupElement.prototype.insertItemElements = function ( itemWidget, index ) {
    	Eif ( index === undefined || index < 0 || index >= this.items.length ) {
    		this.$group.append( itemWidget.$element );
    	} else if ( index === 0 ) {
    		this.$group.prepend( itemWidget.$element );
    	} else {
    		this.items[ index ].$element.before( itemWidget.$element );
    	}
    };

    /**
     * Remove the specified items from a group.
     *
     * Removed items are detached (not removed) from the DOM so that they may be reused.
     * To remove all items from a group, you may wish to use the #clearItems method instead.
     *
     * @param {OO.ui.Element[]} items An array of items to remove
     * @chainable
     */
    OO.ui.mixin.GroupElement.prototype.removeItems = function ( items ) {
    	var i, len, item, index;

    	// Remove specific items elements
    	for ( i = 0, len = items.length; i < len; i++ ) {
    		item = items[ i ];
    		index = this.items.indexOf( item );
    		if ( index !== -1 ) {
    			item.setElementGroup( null );
    			item.$element.detach();
    		}
    	}

    	// Mixin method
    	OO.EmitterList.prototype.removeItems.call( this, items );

    	this.emit( 'change', this.getItems() );
    	return this;
    };

    /**
     * Clear all items from the group.
     *
     * Cleared items are detached from the DOM, not removed, so that they may be reused.
     * To remove only a subset of items from a group, use the #removeItems method.
     *
     * @chainable
     */
    OO.ui.mixin.GroupElement.prototype.clearItems = function () {
    	var i, len;

    	// Remove all item elements
    	for ( i = 0, len = this.items.length; i < len; i++ ) {
    		this.items[ i ].setElementGroup( null );
    		this.items[ i ].$element.detach();
    	}

    	// Mixin method
    	OO.EmitterList.prototype.clearItems.call( this );

    	this.emit( 'change', this.getItems() );
    	return this;
    };