XObject.js

[gitlive] / XObject.js

//<script type="text/javascript">

/**
 * XObject
 * Yet another attempt to create a usable object construction library for seed..
 *
 * Extend this.. to use it's wonderful features..
 * 
 * 
 * @arg xtype {String|Function} constructor or string.
 * @arg xid {String}  (optional) id for registry
 * @arg xns {String|Object}   (optional) namespace eg. Gtk or 'Gtk' - used with xtype.
 * @arg items {Array}   (optional) list of child elements which will be constructed.. using XObject
 * @arg listeners {Object}   (optional) map Gobject signals to functions
 * @arg pack {Function|String|Array}   (optional) how this object gets added to it's parent
 * @arg el {Object}   (optional) premade GObject
 */

function XObject (cfg) {
    // first apply cfg if set.
    o =  {};
    o.pack = o.pack || 'add';
       
    XObject.extend(o, cfg); // copy everything into o.
    XObject.extend(this, o);
    
    // remove items.
    this.items = [];
    this.listeners = this.listeners || {}; 
    
    
    // remove objects/functions from o, so they can be sent to the contructor.
    for (var i in o) {
        if ((typeof(o[i]) == 'object') || 
            (typeof(o[i]) == 'function') || 
            i == 'pack'
        ) {
            delete o[i];
        }
    }
    
    // do we need to call 'beforeInit here?'
     
    // handle include?
    //if ((this.xtype == 'Include')) {
    //    o = this.pre_registry[cls];
    //}
    var isSeed = typeof(Seed) != 'undefined';
     
    // xtype= Gtk.Menu ?? what about c_new stuff?
    if (typeof(this.xtype) == 'function') {
        this.el = this.el ||  new this.xtype(o);
    }
    
    if (!this.el && o.xns) 
        var NS = imports.gi[o.xns];
        if (!NS) {
            Seed.print('Invalid xns: ' + o.xns);
        }
        constructor = NS[o.xtype];
        if (!constructor) {
            Seed.print('Invalid xtype: ' + o.xns + '.' + o.xtype);
        }
        this.el  =   isSeed ? new constructor(o) : new constructor();
    }
    
    
    // register it!
    if (o.xnsid  && o.xid) {
        XObject.registry = XObject.registry || { };
        XObject.registry[o.xnsid] = XObject.registry[o.xnsid] || {}; 
        XObject.registry[o.xnsid][o.xid] = this;
    }
    
    cfg.items.forEach(this.addItem, this);
    
    for (var i in this.listeners) {
        this.addListener(i, this.listeners[i]);
    }
    // delete this.listeners ?
    
    
    // do we need to call 'init here?'
    
}



XObject.prototype = {
    /**
     * @property el {GObject} the Gtk / etc. element.
     */
    el : false, 
    /*
     * @property items {Array} list of sub elements
     */
    /**
     * @property parent {XObject} parent Element
     */
     /**
      * @method addItem
      * Adds an item to the object using a new XObject
      * uses pack property to determine how to add it.
      * @arg cfg {Object} same as XObject constructor.
      */
    addItem : function(o) {
        var item = new XObject(o);
        
        this.items.push(item);
        
         
        if (typeof(item.pack) == 'function') {
            // parent, child
            item.pack.apply(o, [ o , o.items[i] ]);
            item.parent = this;
            return;
        }
        
        
        var pack_m = typeof(item.pack) == 'string' ?  item.pack :  item.pack.shift();
        
        // handle error.
        if (pack_m && typeof(o.el[pack_m]) == 'undefined') {
            Seed.print('pack method not available : ' + o.xtype + '.' +  pack_m);
            return;
        }
        
        
        //Seed.print('Pack ' + o.xtype + '.'+ pack_m + '(' + o.items[i].xtype + ')');
        // copy.
        var args = Array.prototype.slice.call(typeof(item.pack) == 'string' ? [] : item.pack);
        item.pack.unshift(item.el);
        //Seed.print('args: ' + args.length);
        if (pack_m) {
            this.el[pack_m].apply(item.el, args);
        }
        
        item.parent = this;
        
    },
    /**
      * @method addListener
      * Connects a method to a signal. (gjs/Seed aware)
      * 
      * @arg sig  {String} name of signal
      * @arg fn  {Function} handler.
      */
    addListener  : function(sig, fn) {
              
        var _li = XObject.createDelegate(fn,this);
        // private listeners that are not copied to GTk.
        
        if (typeof(Seed) != 'undefined') {
          //   Seed.print(typeof(_li));
            this.el.signal[sig].connect(_li);
        } else {
            this.el.connect( sig, _li);
        }
             
        
    }
    
} 
         
        
/**
 * Copies all the properties of config to obj.
 *
 * Pretty much the same as JQuery/Prototype..
 * @param {Object} obj The receiver of the properties
 * @param {Object} config The source of the properties
 * @param {Object} defaults A different object that will also be applied for default values
 * @return {Object} returns obj
 * @member XObject extend
 */


XObject.extend : function(o, c, defaults){
    if(defaults){
        // no "this" reference for friendly out of scope calls
        XObject.extend(o, defaults);
    }
    if(o && c && typeof c == 'object'){
        for(var p in c){
            o[p] = c[p];
        }
    }
    return o;
};

XObject.extend(XObject,
{
    /**
     * Copies all the properties of config to obj, if the do not exist.
     * @param {Object} obj The receiver of the properties
     * @param {Object} config The source of the properties
     * @return {Object} returns obj
     * @member Object extendIf
     */


    extendIf : function(o, c){

        if(!o || !c || typeof c != 'object'){
            return o;
        }
        for(var p in c){
            if (typeof(o[p]) != 'undefined') {
                continue;
            }
            o[p] = c[p];
        }
        return o;
    },

 

    /**
     * Extends one class with another class and optionally overrides members with the passed literal. This class
     * also adds the function "override()" to the class that can be used to override
     * members on an instance.
     *
     * usage:
     * MyObject = Object.define(
     *     function(...) {
     *          ....
     *     },
     *     parentClass, // or Object
     *     {
     *        ... methods and properties.
     *     }
     * });
     * @param {Function} constructor The class inheriting the functionality
     * @param {Object} superclass The class being extended
     * @param {Object} overrides (optional) A literal with members
     * @return {Function} constructor (eg. class
     * @method define
     */
    define : function(){
        // inline overrides
        var io = function(o){
            for(var m in o){
                this[m] = o[m];
            }
        };
        return function(sb, sp, overrides) {
            if (typeof(sp) == 'undefined') {
                // error condition - try and dump..
                throw "Missing superclass: when applying: " + sb
            }

            var F = function(){}, sbp, spp = sp.prototype;
            F.prototype = spp;
            sbp = sb.prototype = new F();
            sbp.constructor=sb;
            sb.superclass=spp;

            // extends Object.
            if(spp.constructor == Object.prototype.constructor){
                spp.constructor=sp;
            }

            sb.override = function(o){
                Object.extend(sb.prototype, o);
            };
            sbp.override = io;
            Object.extend(sb.prototype, overrides);
            return sb;
        };
    }(),

         
    /**
     * returns a list of keys of the object.
     * @param {Object} obj object to inspect
     * @return {Array} returns list of kyes
     * @member Object keys
     */
    keys : function(o)
    {
        var ret = [];
        for(var i in o) {
            ret.push[i];
        }
        return ret;
    }
});