+ // Create a simple deferred (one callbacks list)
+ _Deferred: function() {
+ var // callbacks list
+ callbacks = [],
+ // stored [ context , args ]
+ fired,
+ // to avoid firing when already doing so
+ firing,
+ // flag to know if the deferred has been cancelled
+ cancelled,
+ // the deferred itself
+ deferred = {
+
+ // done( f1, f2, ...)
+ done: function() {
+ if ( !cancelled ) {
+ var args = arguments,
+ i,
+ length,
+ elem,
+ type,
+ _fired;
+ if ( fired ) {
+ _fired = fired;
+ fired = 0;
+ }
+ for ( i = 0, length = args.length; i < length; i++ ) {
+ elem = args[ i ];
+ type = jQuery.type( elem );
+ if ( type === "array" ) {
+ deferred.done.apply( deferred, elem );
+ } else if ( type === "function" ) {
+ callbacks.push( elem );
+ }
+ }
+ if ( _fired ) {
+ deferred.resolveWith( _fired[ 0 ], _fired[ 1 ] );
+ }
+ }
+ return this;
+ },
+
+ // resolve with given context and args
+ resolveWith: function( context, args ) {
+ if ( !cancelled && !fired && !firing ) {
+ firing = 1;
+ try {
+ while( callbacks[ 0 ] ) {
+ callbacks.shift().apply( context, args );
+ }
+ }
+ finally {
+ fired = [ context, args ];
+ firing = 0;
+ }
+ }
+ return this;
+ },
+
+ // resolve with this as context and given arguments
+ resolve: function() {
+ deferred.resolveWith( jQuery.isFunction( this.promise ) ? this.promise() : this, arguments );
+ return this;
+ },
+
+ // Has this deferred been resolved?
+ isResolved: function() {
+ return !!( firing || fired );
+ },
+
+ // Cancel
+ cancel: function() {
+ cancelled = 1;
+ callbacks = [];
+ return this;
+ }
+ };
+
+ return deferred;
+ },
+
+ // Full fledged deferred (two callbacks list)
+ Deferred: function( func ) {
+ var deferred = jQuery._Deferred(),
+ failDeferred = jQuery._Deferred(),
+ promise;
+ // Add errorDeferred methods, then and promise
+ jQuery.extend( deferred, {
+ then: function( doneCallbacks, failCallbacks ) {
+ deferred.done( doneCallbacks ).fail( failCallbacks );
+ return this;
+ },
+ fail: failDeferred.done,
+ rejectWith: failDeferred.resolveWith,
+ reject: failDeferred.resolve,
+ isRejected: failDeferred.isResolved,
+ // Get a promise for this deferred
+ // If obj is provided, the promise aspect is added to the object
+ promise: function( obj , i /* internal */ ) {
+ if ( obj == null ) {
+ if ( promise ) {
+ return promise;
+ }
+ promise = obj = {};
+ }
+ i = promiseMethods.length;
+ while( i-- ) {
+ obj[ promiseMethods[ i ] ] = deferred[ promiseMethods[ i ] ];
+ }
+ return obj;
+ }
+ } );
+ // Make sure only one callback list will be used
+ deferred.then( failDeferred.cancel, deferred.cancel );
+ // Unexpose cancel
+ delete deferred.cancel;
+ // Call given func if any
+ if ( func ) {
+ func.call( deferred, deferred );