settings.js

const Lang = imports.lang;
const Gio = imports.gi.Gio;
const Me = imports.misc.extensionUtils.getCurrentExtension();


function getFromSchema(extension) {
    let schema = 'org.gnome.shell.extensions.recents';

    const GioSSS = Gio.SettingsSchemaSource;
    let schemaDir = extension.dir.get_child('schemas');
    let schemaSource;
    if (schemaDir.query_exists(null)) {
        schemaSource = GioSSS.new_from_directory(schemaDir.get_path(),
                                                 GioSSS.get_default(),
                                                 false);
    } else {
        schemaSource = GioSSS.get_default();
    }

    let schemaObj = schemaSource.lookup(schema, true);
    if (!schemaObj) {
        throw new Error('Schema ' + schema + ' could not be found for extension ' +
		                extension.metadata.uuid + '. Please check your installation.');
    }

    return new Gio.Settings({settings_schema: schemaObj});
}

const Settings = new Lang.Class({
    Name: 'Settings',
    Extends: Gio.Settings,
    ItemIconSize: 16,
    
    Position: {
        RIGHT: 0,
        LEFT: 1
	},

    _init: function() {
        
	    let schema = 'org.gnome.shell.extensions.recents';
        
        const GioSSS = Gio.SettingsSchemaSource;
        let schemaDir = Me.dir.get_child('schemas');
        let schemaSource;
        if (schemaDir.query_exists(null)) {
            schemaSource = GioSSS.new_from_directory(schemaDir.get_path(),
	                                                 GioSSS.get_default(),
                                                     false);
        } else {
            schemaSource = GioSSS.get_default();
        }

        let schemaObj = schemaSource.lookup(schema, true);
        if (!schemaObj) {
            throw new Error('Schema ' + schema + ' could not be found for extension ' +
	                        extension.metadata.uuid + '. Please check your installation.');
        }

        this.parent({settings_schema: schemaObj});
    },

    getPopupMenuStyle: function() {
        let style = '';
        
        let _popupMenuWidth = this.get_int('popup-menu-width');
        if (_popupMenuWidth !== undefined && _popupMenuWidth !== 0) {
            style += 'width:' + _popupMenuWidth + 'px;';
        }
       
        return style;
    },

    getPosition: function() {
        if (this.get_enum('position') === this.Position.LEFT) {        
            return 'left';
        }
	        
        return 'right';
    }
});