159 lines
4.4 KiB
JavaScript
159 lines
4.4 KiB
JavaScript
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define( [
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"./core",
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"./var/slice",
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"./callbacks"
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], function( jQuery, slice ) {
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jQuery.extend( {
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Deferred: function( func ) {
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var tuples = [
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// action, add listener, listener list, final state
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[ "resolve", "done", jQuery.Callbacks( "once memory" ), "resolved" ],
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[ "reject", "fail", jQuery.Callbacks( "once memory" ), "rejected" ],
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[ "notify", "progress", jQuery.Callbacks( "memory" ) ]
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],
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state = "pending",
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promise = {
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state: function() {
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return state;
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},
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always: function() {
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deferred.done( arguments ).fail( arguments );
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return this;
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},
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then: function( /* fnDone, fnFail, fnProgress */ ) {
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var fns = arguments;
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return jQuery.Deferred( function( newDefer ) {
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jQuery.each( tuples, function( i, tuple ) {
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var fn = jQuery.isFunction( fns[ i ] ) && fns[ i ];
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// deferred[ done | fail | progress ] for forwarding actions to newDefer
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deferred[ tuple[ 1 ] ]( function() {
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var returned = fn && fn.apply( this, arguments );
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if ( returned && jQuery.isFunction( returned.promise ) ) {
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returned.promise()
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.progress( newDefer.notify )
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.done( newDefer.resolve )
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.fail( newDefer.reject );
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} else {
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newDefer[ tuple[ 0 ] + "With" ](
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this === promise ? newDefer.promise() : this,
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fn ? [ returned ] : arguments
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);
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}
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} );
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} );
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fns = null;
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} ).promise();
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},
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// Get a promise for this deferred
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// If obj is provided, the promise aspect is added to the object
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promise: function( obj ) {
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return obj != null ? jQuery.extend( obj, promise ) : promise;
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}
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},
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deferred = {};
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// Keep pipe for back-compat
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promise.pipe = promise.then;
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// Add list-specific methods
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jQuery.each( tuples, function( i, tuple ) {
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var list = tuple[ 2 ],
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stateString = tuple[ 3 ];
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// promise[ done | fail | progress ] = list.add
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promise[ tuple[ 1 ] ] = list.add;
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// Handle state
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if ( stateString ) {
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list.add( function() {
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// state = [ resolved | rejected ]
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state = stateString;
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// [ reject_list | resolve_list ].disable; progress_list.lock
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}, tuples[ i ^ 1 ][ 2 ].disable, tuples[ 2 ][ 2 ].lock );
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}
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// deferred[ resolve | reject | notify ]
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deferred[ tuple[ 0 ] ] = function() {
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deferred[ tuple[ 0 ] + "With" ]( this === deferred ? promise : this, arguments );
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return this;
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};
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deferred[ tuple[ 0 ] + "With" ] = list.fireWith;
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} );
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// Make the deferred a promise
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promise.promise( deferred );
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// Call given func if any
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if ( func ) {
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func.call( deferred, deferred );
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}
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// All done!
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return deferred;
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},
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// Deferred helper
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when: function( subordinate /* , ..., subordinateN */ ) {
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var i = 0,
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resolveValues = slice.call( arguments ),
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length = resolveValues.length,
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// the count of uncompleted subordinates
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remaining = length !== 1 ||
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( subordinate && jQuery.isFunction( subordinate.promise ) ) ? length : 0,
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// the master Deferred.
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// If resolveValues consist of only a single Deferred, just use that.
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deferred = remaining === 1 ? subordinate : jQuery.Deferred(),
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// Update function for both resolve and progress values
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updateFunc = function( i, contexts, values ) {
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return function( value ) {
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contexts[ i ] = this;
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values[ i ] = arguments.length > 1 ? slice.call( arguments ) : value;
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if ( values === progressValues ) {
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deferred.notifyWith( contexts, values );
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} else if ( !( --remaining ) ) {
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deferred.resolveWith( contexts, values );
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}
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};
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},
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progressValues, progressContexts, resolveContexts;
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// Add listeners to Deferred subordinates; treat others as resolved
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if ( length > 1 ) {
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progressValues = new Array( length );
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progressContexts = new Array( length );
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resolveContexts = new Array( length );
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for ( ; i < length; i++ ) {
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if ( resolveValues[ i ] && jQuery.isFunction( resolveValues[ i ].promise ) ) {
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resolveValues[ i ].promise()
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.progress( updateFunc( i, progressContexts, progressValues ) )
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.done( updateFunc( i, resolveContexts, resolveValues ) )
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.fail( deferred.reject );
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} else {
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--remaining;
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}
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}
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}
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// If we're not waiting on anything, resolve the master
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if ( !remaining ) {
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deferred.resolveWith( resolveContexts, resolveValues );
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}
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return deferred.promise();
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}
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} );
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return jQuery;
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} );
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