declare.js

初学者

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.lang.declare");
dojo.require("dojo.lang.common");
dojo.require("dojo.lang.extras");
dojo.lang.declare = function (className, superclass, init, props) {
	if ((dojo.lang.isFunction(props)) || ((!props) && (!dojo.lang.isFunction(init)))) {
		var temp = props;
		props = init;
		init = temp;
	}
	var mixins = [];
	if (dojo.lang.isArray(superclass)) {
		mixins = superclass;
		superclass = mixins.shift();
	}
	if (!init) {
		init = dojo.evalObjPath(className, false);
		if ((init) && (!dojo.lang.isFunction(init))) {
			init = null;
		}
	}
	var ctor = dojo.lang.declare._makeConstructor();
	var scp = (superclass ? superclass.prototype : null);
	if (scp) {
		scp.prototyping = true;
		ctor.prototype = new superclass();
		scp.prototyping = false;
	}
	ctor.superclass = scp;
	ctor.mixins = mixins;
	for (var i = 0, l = mixins.length; i < l; i++) {
		dojo.lang.extend(ctor, mixins[i].prototype);
	}
	ctor.prototype.initializer = null;
	ctor.prototype.declaredClass = className;
	if (dojo.lang.isArray(props)) {
		dojo.lang.extend.apply(dojo.lang, [ctor].concat(props));
	} else {
		dojo.lang.extend(ctor, (props) || {});
	}
	dojo.lang.extend(ctor, dojo.lang.declare._common);
	ctor.prototype.constructor = ctor;
	ctor.prototype.initializer = (ctor.prototype.initializer) || (init) || (function () {
	});
	var created = dojo.parseObjPath(className, null, true);
	created.obj[created.prop] = ctor;
	return ctor;
};
dojo.lang.declare._makeConstructor = function () {
	return function () {
		var self = this._getPropContext();
		var s = self.constructor.superclass;
		if ((s) && (s.constructor)) {
			if (s.constructor == arguments.callee) {
				this._inherited("constructor", arguments);
			} else {
				this._contextMethod(s, "constructor", arguments);
			}
		}
		var ms = (self.constructor.mixins) || ([]);
		for (var i = 0, m; (m = ms[i]); i++) {
			(((m.prototype) && (m.prototype.initializer)) || (m)).apply(this, arguments);
		}
		if ((!this.prototyping) && (self.initializer)) {
			self.initializer.apply(this, arguments);
		}
	};
};
dojo.lang.declare._common = {_getPropContext:function () {
	return (this.___proto || this);
}, _contextMethod:function (ptype, method, args) {
	var result, stack = this.___proto;
	this.___proto = ptype;
	try {
		result = ptype[method].apply(this, (args || []));
	}
	catch (e) {
		throw e;
	}
	finally {
		this.___proto = stack;
	}
	return result;
}, _inherited:function (prop, args) {
	var p = this._getPropContext();
	do {
		if ((!p.constructor) || (!p.constructor.superclass)) {
			return;
		}
		p = p.constructor.superclass;
	} while (!(prop in p));
	return (dojo.lang.isFunction(p[prop]) ? this._contextMethod(p, prop, args) : p[prop]);
}, inherited:function (prop, args) {
	dojo.deprecated("'inherited' method is dangerous, do not up-call! 'inherited' is slated for removal in 0.5; name your super class (or use superclass property) instead.", "0.5");
	this._inherited(prop, args);
}};
dojo.declare = dojo.lang.declare;