Function Deferred

static/webuploader/webuploader.custom.js:261–360

( func )

        }
    
        function Deferred( func ) {
            var tuples = [
                    // action, add listener, listener list, final state
                    [ 'resolve', 'done', Callbacks( true ), 'resolved' ],
                    [ 'reject', 'fail', Callbacks( true ), 'rejected' ],
                    [ 'notify', 'progress', Callbacks() ]
                ],
                state = 'pending',
                promise = {
                    state: function() {
                        return state;
                    },
                    always: function() {
                        deferred.done( arguments ).fail( arguments );
                        return this;
                    },
                    then: function( /* fnDone, fnFail, fnProgress */ ) {
                        var fns = arguments;
                        return Deferred(function( newDefer ) {
                            $.each( tuples, function( i, tuple ) {
                                var action = tuple[ 0 ],
                                    fn = $.isFunction( fns[ i ] ) && fns[ i ];
    
                                // deferred[ done | fail | progress ] for
                                // forwarding actions to newDefer
                                deferred[ tuple[ 1 ] ](function() {
                                    var returned;
    
                                    returned = fn && fn.apply( this, arguments );
    
                                    if ( returned &&
                                            $.isFunction( returned.promise ) ) {
    
                                        returned.promise()
                                                .done( newDefer.resolve )
                                                .fail( newDefer.reject )
                                                .progress( newDefer.notify );
                                    } else {
                                        newDefer[ action + 'With' ](
                                                this === promise ?
                                                newDefer.promise() :
                                                this,
                                                fn ? [ returned ] : arguments );
                                    }
                                });
                            });
                            fns = null;
                        }).promise();
                    },
    
                    // Get a promise for this deferred
                    // If obj is provided, the promise aspect is added to the object
                    promise: function( obj ) {
    
                        return obj != null ? $.extend( obj, promise ) : promise;
                    }
                },
                deferred = {};