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+ <title>The source code</title>
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+ <pre class="prettyprint lang-js">/*!
+ * Ext JS Library 3.3.0
+ * Copyright(c) 2006-2010 Ext JS, Inc.
+ * licensing@extjs.com
+ * http://www.extjs.com/license
+ */
+<div id="cls-Ext.util.Functions"></div>/**
+ * @class Ext.util.Functions
+ * @singleton
+ */
+Ext.util.Functions = {
+ <div id="method-Ext.util.Functions-createInterceptor"></div>/**
+ * Creates an interceptor function. The passed function is called before the original one. If it returns false,
+ * the original one is not called. The resulting function returns the results of the original function.
+ * The passed function is called with the parameters of the original function. Example usage:
+ * <pre><code>
+var sayHi = function(name){
+ alert('Hi, ' + name);
+}
+
+sayHi('Fred'); // alerts "Hi, Fred"
+
+// create a new function that validates input without
+// directly modifying the original function:
+var sayHiToFriend = Ext.createInterceptor(sayHi, function(name){
+ return name == 'Brian';
+});
+
+sayHiToFriend('Fred'); // no alert
+sayHiToFriend('Brian'); // alerts "Hi, Brian"
+ </code></pre>
+ * @param {Function} origFn The original function.
+ * @param {Function} newFn The function to call before the original
+ * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the passed function is executed.
+ * <b>If omitted, defaults to the scope in which the original function is called or the browser window.</b>
+ * @return {Function} The new function
+ */
+ createInterceptor: function(origFn, newFn, scope) {
+ var method = origFn;
+ if (!Ext.isFunction(newFn)) {
+ return origFn;
+ }
+ else {
+ return function() {
+ var me = this,
+ args = arguments;
+ newFn.target = me;
+ newFn.method = origFn;
+ return (newFn.apply(scope || me || window, args) !== false) ?
+ origFn.apply(me || window, args) :
+ null;
+ };
+ }
+ },
+
+ <div id="method-Ext.util.Functions-createDelegate"></div>/**
+ * Creates a delegate (callback) that sets the scope to obj.
+ * Call directly on any function. Example: <code>Ext.createDelegate(this.myFunction, this, [arg1, arg2])</code>
+ * Will create a function that is automatically scoped to obj so that the <tt>this</tt> variable inside the
+ * callback points to obj. Example usage:
+ * <pre><code>
+var sayHi = function(name){
+ // Note this use of "this.text" here. This function expects to
+ // execute within a scope that contains a text property. In this
+ // example, the "this" variable is pointing to the btn object that
+ // was passed in createDelegate below.
+ alert('Hi, ' + name + '. You clicked the "' + this.text + '" button.');
+}
+
+var btn = new Ext.Button({
+ text: 'Say Hi',
+ renderTo: Ext.getBody()
+});
+
+// This callback will execute in the scope of the
+// button instance. Clicking the button alerts
+// "Hi, Fred. You clicked the "Say Hi" button."
+btn.on('click', Ext.createDelegate(sayHi, btn, ['Fred']));
+ </code></pre>
+ * @param {Function} fn The function to delegate.
+ * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the function is executed.
+ * <b>If omitted, defaults to the browser window.</b>
+ * @param {Array} args (optional) Overrides arguments for the call. (Defaults to the arguments passed by the caller)
+ * @param {Boolean/Number} appendArgs (optional) if True args are appended to call args instead of overriding,
+ * if a number the args are inserted at the specified position
+ * @return {Function} The new function
+ */
+ createDelegate: function(fn, obj, args, appendArgs) {
+ if (!Ext.isFunction(fn)) {
+ return fn;
+ }
+ return function() {
+ var callArgs = args || arguments;
+ if (appendArgs === true) {
+ callArgs = Array.prototype.slice.call(arguments, 0);
+ callArgs = callArgs.concat(args);
+ }
+ else if (Ext.isNumber(appendArgs)) {
+ 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 fn.apply(obj || window, callArgs);
+ };
+ },
+
+ <div id="method-Ext.util.Functions-defer"></div>/**
+ * Calls this function after the number of millseconds specified, optionally in a specific scope. Example usage:
+ * <pre><code>
+var sayHi = function(name){
+ alert('Hi, ' + name);
+}
+
+// executes immediately:
+sayHi('Fred');
+
+// executes after 2 seconds:
+Ext.defer(sayHi, 2000, this, ['Fred']);
+
+// this syntax is sometimes useful for deferring
+// execution of an anonymous function:
+Ext.defer(function(){
+ alert('Anonymous');
+}, 100);
+ </code></pre>
+ * @param {Function} fn The function to defer.
+ * @param {Number} millis The number of milliseconds for the setTimeout call (if less than or equal to 0 the function is executed immediately)
+ * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the function is executed.
+ * <b>If omitted, defaults to the browser window.</b>
+ * @param {Array} args (optional) Overrides arguments for the call. (Defaults to the arguments passed by the caller)
+ * @param {Boolean/Number} appendArgs (optional) if True args are appended to call args instead of overriding,
+ * if a number the args are inserted at the specified position
+ * @return {Number} The timeout id that can be used with clearTimeout
+ */
+ defer: function(fn, millis, obj, args, appendArgs) {
+ fn = Ext.util.Functions.createDelegate(fn, obj, args, appendArgs);
+ if (millis > 0) {
+ return setTimeout(fn, millis);
+ }
+ fn();
+ return 0;
+ },
+
+
+ <div id="method-Ext.util.Functions-createSequence"></div>/**
+ * Create a combined function call sequence of the original function + the passed function.
+ * The resulting function returns the results of the original function.
+ * The passed fcn is called with the parameters of the original function. Example usage:
+ *
+
+var sayHi = function(name){
+ alert('Hi, ' + name);
+}
+
+sayHi('Fred'); // alerts "Hi, Fred"
+
+var sayGoodbye = Ext.createSequence(sayHi, function(name){
+ alert('Bye, ' + name);
+});
+
+sayGoodbye('Fred'); // both alerts show
+
+ * @param {Function} origFn The original function.
+ * @param {Function} newFn The function to sequence
+ * @param {Object} scope (optional) The scope (this reference) in which the passed function is executed.
+ * If omitted, defaults to the scope in which the original function is called or the browser window.
+ * @return {Function} The new function
+ */
+ createSequence: function(origFn, newFn, scope) {
+ if (!Ext.isFunction(newFn)) {
+ return origFn;
+ }
+ else {
+ return function() {
+ var retval = origFn.apply(this || window, arguments);
+ newFn.apply(scope || this || window, arguments);
+ return retval;
+ };
+ }
+ }
+};
+
+/**
+ * Shorthand for {@link Ext.util.Functions#defer}
+ * @param {Function} fn The function to defer.
+ * @param {Number} millis The number of milliseconds for the setTimeout call (if less than or equal to 0 the function is executed immediately)
+ * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the function is executed.
+ * <b>If omitted, defaults to the browser window.</b>
+ * @param {Array} args (optional) Overrides arguments for the call. (Defaults to the arguments passed by the caller)
+ * @param {Boolean/Number} appendArgs (optional) if True args are appended to call args instead of overriding,
+ * if a number the args are inserted at the specified position
+ * @return {Number} The timeout id that can be used with clearTimeout
+ * @member Ext
+ * @method defer
+ */
+
+Ext.defer = Ext.util.Functions.defer;
+
+/**
+ * Shorthand for {@link Ext.util.Functions#createInterceptor}
+ * @param {Function} origFn The original function.
+ * @param {Function} newFn The function to call before the original
+ * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the passed function is executed.
+ * <b>If omitted, defaults to the scope in which the original function is called or the browser window.</b>
+ * @return {Function} The new function
+ * @member Ext
+ * @method defer
+ */
+
+Ext.createInterceptor = Ext.util.Functions.createInterceptor;
+
+/**
+ * Shorthand for {@link Ext.util.Functions#createSequence}
+ * @param {Function} origFn The original function.
+ * @param {Function} newFn The function to sequence
+ * @param {Object} scope (optional) The scope (this reference) in which the passed function is executed.
+ * If omitted, defaults to the scope in which the original function is called or the browser window.
+ * @return {Function} The new function
+ * @member Ext
+ * @method defer
+ */
+
+Ext.createSequence = Ext.util.Functions.createSequence;
+
+<div id="method-Ext-defer"></div>/**
+ * Shorthand for {@link Ext.util.Functions#createDelegate}
+ * @param {Function} fn The function to delegate.
+ * @param {Object} scope (optional) The scope (<code><b>this</b></code> reference) in which the function is executed.
+ * <b>If omitted, defaults to the browser window.</b>
+ * @param {Array} args (optional) Overrides arguments for the call. (Defaults to the arguments passed by the caller)
+ * @param {Boolean/Number} appendArgs (optional) if True args are appended to call args instead of overriding,
+ * if a number the args are inserted at the specified position
+ * @return {Function} The new function
+ * @member Ext
+ * @method defer
+ */
+Ext.createDelegate = Ext.util.Functions.createDelegate;
+</pre>
+</body>
+</html>
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