gocodebox/lifterlms

/**
 * Shiftable view mixin function
 *
 * @since    3.16.0
 * @version  3.16.0
 */
define( [], function() {

    return {

        /**
         * Conditionally hide action buttons based on section position in collection
         *
         * @return   void
         * @since    3.16.0
         * @version  3.16.0
         */
        maybe_hide_shiftable_buttons: function() {

            if ( ! this.model.collection ) {
                return;
            }

            var type = this.model.get( 'type' );

            if ( this.model.collection.first() === this.model ) {
                this.$el.find( '.shift-up--' + type ).hide();
            } else if ( this.model.collection.last() === this.model ) {
                this.$el.find( '.shift-down--' + type ).hide();
            }

        },

        /**
         * Move an item in a collection from one position to another
         *
         * @param    int   old_index  current (old) index within the collection
         * @param    int   new_index  desired (new) index within the collection
         * @return   void
         * @since    3.16.0
         * @version  3.16.0
         */
        shift: function( old_index, new_index ) {

            var collection = this.model.collection;

            collection.remove( this.model );
            collection.add( this.model, { at: new_index } );
            collection.trigger( 'reorder' );

        },

        /**
         * Move an item down the tree one position
         *
         * @return   void
         * @since    3.16.0
         * @version  3.16.0
         */
        shift_down: function( e ) {

            e.preventDefault();
            var index = this.model.collection.indexOf( this.model );
            this.shift( index, index + 1 );

        },

        /**
         * Move an item up the tree one position
         *
         * @return   void
         * @since    3.16.0
         * @version  3.16.0
         */
        shift_up: function( e ) {

            e.preventDefault();
            var index = this.model.collection.indexOf( this.model );
            this.shift( index, index - 1 );

        },

    };

} );