From: Alan Knowles <alan@akkbhome.com>
Date: Tue, 6 Jul 2010 13:39:08 +0000 (+0800)
Subject: XObject.js
X-Git-Url: http://git.roojs.org/?p=gnome.introspection-doc-generator;a=commitdiff_plain;h=5e9afbc24a5d100e9f3dc2ea95757e8cdc1fae7c

XObject.js
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+//<script type="text/javascript">
+/*
+ * Copyright(c) 2010 Alan Knowles <alan@akbkhome.com>
+ * Licence - LGPL
+ */
+ 
+/**
+ * XObject
+ * Yet another attempt to create a usable object construction library for seed..
+ * 
+ * Why is this useful?
+ * A) It turns rather messy code into a tree structure, making it easy to find code relating to 
+ *    an interface element
+ * B) In theory it should be gjs/Seed compatible..
+ * C) It provides getElementById style lookups for elements.
+ * D) It provides classic OO constructors for Javascript (extend/define)
+ * E) It does not modify any buildin prototypes.. 
+ *
+ * Extend this.. to use it's wonderful features..
+ * 
+ * normal usage:
+ * XObject = imports.XObject.XObject;
+ * 
+ * Xyz = new XObject({
+ *     xtype: Gtk.Window,
+ *     id : 'window',
+ *     items : [
+ *     
+ *     ]
+ *  });
+ *  Xyz.init(); // create and show.
+ * 
+ * 
+ * 
+ * @arg xtype {String|Function} constructor or string.
+ * @arg id {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
+ * 
+ *  --- needs a xdebug option!
+ * 
+ * 
+ * He's some questions.
+ * - should we generate ID's for all elements? (if so we probably need to garbage collect)
+ * - should we have a special property to use as the constructor / gobject.properties rather
+ *   than sending all basic types to this?
+ * 
+ * 
+ */
+
+function XObject (cfg) {
+    // first apply cfg if set.
+    this.config = cfg;
+    if (cfg.init) {
+        this.init = cfg.init; // override!
+    }
+    
+    
+}
+
+
+
+XObject.prototype = {
+    /**
+     * @property el {GObject} the Gtk / etc. element.
+     */
+    el : false, 
+    /*
+     * @property items {Array} list of sub elements
+     */
+    /**
+     * @property parent {XObject} parent Element
+     */
+     
+     /**
+     * @property config {Object} the construction configuration.
+     */
+     /**
+      * @method init
+      * Initializes the Element (el) hooks up all the listeners
+      * and packs the children.
+      * you can override this, in child objects, then 
+      * do this to do thi initaliztion.
+      * 
+      * XObject.prototype.init.call(this); 
+      * 
+      */ 
+    init : function()
+    {
+        var cfg = this.config;
+    
+        print("new xobj?"  + XObject.keys(cfg).join(','));
+        //print(cfg);
+        o =  {};
+        
+        cfg.items = cfg.items || [];
+        
+        XObject.extend(o, cfg); // copy everything into o.
+        
+        o.pack = typeof(o.pack) == 'undefined' ? 'add' : o.pack;
+        
+        XObject.extend(this, o);
+
+        // remove items.
+        
+        this.listeners = this.listeners || {}; 
+        this.items = [];
+        
+        // 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' ||
+                i == 'id' ||
+                i == 'xtype' ||
+                i == 'xdebug' ||
+                i == 'xns'
+            ) {
+                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?
+        print(this.xtype);
+        if (typeof(this.xtype) == 'function') {
+            print("func?"  + XObject.keys(o).join(','));
+            this.el = this.el ||   this.xtype(o);
+        }
+        if (typeof(this.xtype) == 'object') {
+            print("obj?"  + XObject.keys(o).join(','));
+            this.el = this.el ||  new this.xtype(o);
+        }
+        //print(this.el);
+        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();
+            
+        }
+        // always overlay props..
+        for (var i in o) {
+            this.el[i] = o[i];
+        }
+        // register it!
+        //if (o.xnsid  && o.id) {
+         //   XObject.registry = XObject.registry || { };
+         //   XObject.registry[o.xnsid] = XObject.registry[o.xnsid] || {}; 
+         //   XObject.registry[o.xnsid][o.id] = 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?'
+    },
+      
+     
+     /**
+      * @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 = (o.constructor == XObject) ? o : new XObject(o);
+        item.init();
+        item.parent = this;
+        this.items.push(item);
+        
+        if (item.pack===false) {  // no 
+            return;
+        }
+        if (typeof(item.pack) == 'function') {
+            // parent, child
+            item.pack.apply(o, [ o , o.items[i] ]);
+            item.parent = this;
+            return;
+        }
+        var args = [];
+        var pack_m  = false;
+        if (typeof(item.pack) == 'string') {
+            pack_m = item.pack;
+        } else {
+            pack_m = item.pack.shift();
+            args = item.pack;
+        }
+        
+        // handle error.
+        if (pack_m && typeof(this.el[pack_m]) == 'undefined') {
+            Seed.print('pack method not available : ' + this.xtype + '.' +  pack_m);
+            return;
+        }
+        
+        
+        //Seed.print('Pack ' + this.el + '.'+ pack_m + '(' + item.el + ')');
+
+        args.unshift(item.el);
+        print('[' + args.join(',') +']');
+        //Seed.print('args: ' + args.length);
+        if (pack_m) {
+            this.el[pack_m].apply(this.el, args);
+        }
+        
+       
+        
+    },
+    /**
+      * @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) 
+    {
+ 
+        Seed.print("Add signal " + sig);
+ 
+        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);
+        }
+             
+        
+    },
+     /**
+      * @method get
+      * Finds an object in the child elements using xid of object.
+      * prefix with '.' to look up the tree.. multiple '..' to look further up..
+      * 
+      * @arg name  {String} name of signal
+      * @return   {XObject|false} the object if found.
+      */
+    get : function(xid)
+    {
+        var ret=  false;
+        if (xid[0] == '.') {
+            return this.parent.get(xid.substring(1));
+        }
+        
+        
+        this.items.forEach(function(ch) {
+            if (ch.id == xid) {
+                ret = ch;
+                return true;
+            }
+        })
+        if (ret) {
+            return ret;
+        }
+        // iterate children.
+        this.items.forEach(function(ch) {
+            ret = ch.get(xid);
+            if (ret) {
+                return true;
+            }
+        })
+        return ret;
+    }
+      
+      
+} 
+         
+        
+/**
+ * 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;
+            XObject.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 XObject keys
+     */
+    keys : function(o)
+    {
+        var ret = [];
+        for(var i in o) {
+            ret.push(i);
+        }
+        return ret;
+    },
+      
+    /**
+     * @member XObject createDelegate
+     * creates a delage metdhod
+     * @param {Function} method to wrap
+     * @param {Object} scope 
+     * @param {Array} args to add
+     * @param {Boolean|Number} append arguments or replace after N arguments.
+     * @return {Function} returns the delegate
+     * 
+     * Usage: 
+     *  function a() .... 
+     * 
+     * x = XObject.createDelegate(a, this);
+     * 
+     */
+
+    createDelegate : function(method, obj, args, appendArgs){
+        
+        return function() {
+            var callArgs = args || arguments;
+            if(appendArgs === true){
+                callArgs = Array.prototype.slice.call(arguments, 0);
+                callArgs = callArgs.concat(args);
+            }else if(typeof appendArgs == "number"){
+                callArgs = Array.prototype.slice.call(arguments, 0); // copy arguments first
+                    var applyArgs = [appendArgs, 0].concat(args); // create method call params
+                    Array.prototype.splice.apply(callArgs, applyArgs); // splice them in
+                }
+                return method.apply(obj || window, callArgs);
+            };
+    }
+    
+});
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