-<html>\r
-<head>\r
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> \r
- <title>The source code</title>\r
- <link href="../resources/prettify/prettify.css" type="text/css" rel="stylesheet" />\r
- <script type="text/javascript" src="../resources/prettify/prettify.js"></script>\r
-</head>\r
-<body onload="prettyPrint();">\r
- <pre class="prettyprint lang-js"><div id="cls-Ext.util.Observable"></div>/**\r
- * @class Ext.util.Observable\r
- */\r
-Ext.apply(Ext.util.Observable.prototype, function(){\r
- // this is considered experimental (along with beforeMethod, afterMethod, removeMethodListener?)\r
- // allows for easier interceptor and sequences, including cancelling and overwriting the return value of the call\r
- // private\r
- function getMethodEvent(method){\r
- var e = (this.methodEvents = this.methodEvents ||\r
- {})[method], returnValue, v, cancel, obj = this;\r
-\r
- if (!e) {\r
- this.methodEvents[method] = e = {};\r
- e.originalFn = this[method];\r
- e.methodName = method;\r
- e.before = [];\r
- e.after = [];\r
-\r
- var makeCall = function(fn, scope, args){\r
- if (!Ext.isEmpty(v = fn.apply(scope || obj, args))) {\r
- if (Ext.isObject(v)) {\r
- returnValue = !Ext.isEmpty(v.returnValue) ? v.returnValue : v;\r
- cancel = !!v.cancel;\r
- }\r
- else\r
- if (v === false) {\r
- cancel = true;\r
- }\r
- else {\r
- returnValue = v;\r
- }\r
- }\r
- };\r
-\r
- this[method] = function(){\r
- var args = Ext.toArray(arguments);\r
- returnValue = v = undefined;\r
- cancel = false;\r
-\r
- Ext.each(e.before, function(b){\r
- makeCall(b.fn, b.scope, args);\r
- if (cancel) {\r
- return returnValue;\r
- }\r
- });\r
-\r
- if (!Ext.isEmpty(v = e.originalFn.apply(obj, args))) {\r
- returnValue = v;\r
- }\r
- Ext.each(e.after, function(a){\r
- makeCall(a.fn, a.scope, args);\r
- if (cancel) {\r
- return returnValue;\r
- }\r
- });\r
- return returnValue;\r
- };\r
- }\r
- return e;\r
- }\r
-\r
- return {\r
- // these are considered experimental\r
- // allows for easier interceptor and sequences, including cancelling and overwriting the return value of the call\r
- // adds an 'interceptor' called before the original method\r
- beforeMethod : function(method, fn, scope){\r
- getMethodEvent.call(this, method).before.push({\r
- fn: fn,\r
- scope: scope\r
- });\r
- },\r
-\r
- // adds a 'sequence' called after the original method\r
- afterMethod : function(method, fn, scope){\r
- getMethodEvent.call(this, method).after.push({\r
- fn: fn,\r
- scope: scope\r
- });\r
- },\r
-\r
- removeMethodListener: function(method, fn, scope){\r
- var e = getMethodEvent.call(this, method), found = false;\r
- Ext.each(e.before, function(b, i, arr){\r
- if (b.fn == fn && b.scope == scope) {\r
- arr.splice(i, 1);\r
- found = true;\r
- return false;\r
- }\r
- });\r
- if (!found) {\r
- Ext.each(e.after, function(a, i, arr){\r
- if (a.fn == fn && a.scope == scope) {\r
- arr.splice(i, 1);\r
- return false;\r
- }\r
- });\r
- }\r
- },\r
-\r
- <div id="method-Ext.util.Observable-relayEvents"></div>/**\r
- * Relays selected events from the specified Observable as if the events were fired by <tt><b>this</b></tt>.\r
- * @param {Object} o The Observable whose events this object is to relay.\r
- * @param {Array} events Array of event names to relay.\r
- */\r
- relayEvents : function(o, events){\r
- var me = this;\r
- function createHandler(ename){\r
- return function(){\r
- return me.fireEvent.apply(me, [ename].concat(Ext.toArray(arguments)));\r
- };\r
- }\r
- Ext.each(events, function(ename){\r
- me.events[ename] = me.events[ename] || true;\r
- o.on(ename, createHandler(ename), me);\r
- });\r
- },\r
-\r
- <div id="method-Ext.util.Observable-enableBubble"></div>/**\r
- * <p>Enables events fired by this Observable to bubble up an owner hierarchy by calling\r
- * <code>this.getBubbleTarget()</code> if present. There is no implementation in the Observable base class.</p>\r
- * <p>This is commonly used by Ext.Components to bubble events to owner Containers. See {@link Ext.Component.getBubbleTarget}. The default\r
- * implementation in Ext.Component returns the Component's immediate owner. But if a known target is required, this can be overridden to\r
- * access the required target more quickly.</p>\r
- * <p>Example:</p><pre><code>\r
-Ext.override(Ext.form.Field, {\r
- // Add functionality to Field's initComponent to enable the change event to bubble\r
- initComponent : Ext.form.Field.prototype.initComponent.createSequence(function() {\r
- this.enableBubble('change');\r
- }),\r
-\r
- // We know that we want Field's events to bubble directly to the FormPanel.\r
- getBubbleTarget : function() {\r
- if (!this.formPanel) {\r
- this.formPanel = this.findParentByType('form');\r
- }\r
- return this.formPanel;\r
- }\r
-});\r
-\r
-var myForm = new Ext.formPanel({\r
- title: 'User Details',\r
- items: [{\r
- ...\r
- }],\r
- listeners: {\r
- change: function() {\r
- // Title goes red if form has been modified.\r
- myForm.header.setStyle('color', 'red');\r
- }\r
- }\r
-});\r
-</code></pre>\r
- * @param {String/Array} events The event name to bubble, or an Array of event names.\r
- */\r
- enableBubble : function(events){\r
- var me = this;\r
- if(!Ext.isEmpty(events)){\r
- events = Ext.isArray(events) ? events : Ext.toArray(arguments);\r
- Ext.each(events, function(ename){\r
- ename = ename.toLowerCase();\r
- var ce = me.events[ename] || true;\r
- if (Ext.isBoolean(ce)) {\r
- ce = new Ext.util.Event(me, ename);\r
- me.events[ename] = ce;\r
- }\r
- ce.bubble = true;\r
- });\r
- }\r
- }\r
- };\r
-}());\r
-\r
-\r
-<div id="method-Ext.util.Observable-Observable.capture"></div>/**\r
- * Starts capture on the specified Observable. All events will be passed\r
- * to the supplied function with the event name + standard signature of the event\r
- * <b>before</b> the event is fired. If the supplied function returns false,\r
- * the event will not fire.\r
- * @param {Observable} o The Observable to capture events from.\r
- * @param {Function} fn The function to call when an event is fired.\r
- * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the Observable firing the event.\r
- * @static\r
- */\r
-Ext.util.Observable.capture = function(o, fn, scope){\r
- o.fireEvent = o.fireEvent.createInterceptor(fn, scope);\r
-};\r
-\r
-\r
-<div id="method-Ext.util.Observable-Observable.observeClass"></div>/**\r
- * Sets observability on the passed class constructor.<p>\r
- * <p>This makes any event fired on any instance of the passed class also fire a single event through\r
- * the <i>class</i> allowing for central handling of events on many instances at once.</p>\r
- * <p>Usage:</p><pre><code>\r
-Ext.util.Observable.observeClass(Ext.data.Connection);\r
-Ext.data.Connection.on('beforerequest', function(con, options) {\r
- console.log('Ajax request made to ' + options.url);\r
-});</code></pre>\r
- * @param {Function} c The class constructor to make observable.\r
- * @param {Object} listeners An object containing a series of listeners to add. See {@link #addListener}. \r
- * @static\r
- */\r
-Ext.util.Observable.observeClass = function(c, listeners){\r
- if(c){\r
- if(!c.fireEvent){\r
- Ext.apply(c, new Ext.util.Observable());\r
- Ext.util.Observable.capture(c.prototype, c.fireEvent, c);\r
- }\r
- if(Ext.isObject(listeners)){\r
- c.on(listeners);\r
- }\r
- return c;\r
- }\r
-};</pre> \r
-</body>\r
-</html>
\ No newline at end of file
git.ithinksw.org / extjs.git / blobdiff