Most of our framework is encapsulated in a class called
XClass. The notation for declaring a class
is implemented by the declare method.
Here is part of the prototype for
XClass containing the declare method.
Hover over an area to see a comment explaining the code.
01: XClass.prototype = {
02: constructor: XClass,
03: declare: function(className, superclass, properties) {04: var f = new Function();
05: f.prototype = superclass.prototype;
06: var cproto = new f();
07: cproto.className = className;
08: cproto.superclass = superclass;09: var ctor = properties['constructor'];
10: if ( ctor ) {
11: var a = [ ctor ];
12: cproto.constructors = superclass.prototype.constructors.concat(a);
13: }
14: else {
15: cproto.constructors = superclass.constructors;
16: }17: this.merge(cproto, properties);18: eval("var newClass = function " + className +
19: "(){this.init(arguments);}");20: proto.constructor = newClass;
21: newClass.prototype = cproto;
22: window[className] = newClass;23: }
24: }
Next we examine the merge method.