237 lines
5.4 KiB
JavaScript
237 lines
5.4 KiB
JavaScript
define( [
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"./core",
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"./core/toType",
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"./var/isFunction",
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"./var/rnothtmlwhite"
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], function( jQuery, toType, isFunction, rnothtmlwhite ) {
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"use strict";
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// Convert String-formatted options into Object-formatted ones
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function createOptions( options ) {
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var object = {};
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jQuery.each( options.match( rnothtmlwhite ) || [], function( _, flag ) {
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object[ flag ] = true;
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} );
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return object;
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}
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/*
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* Create a callback list using the following parameters:
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*
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* options: an optional list of space-separated options that will change how
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* the callback list behaves or a more traditional option object
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*
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* By default a callback list will act like an event callback list and can be
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* "fired" multiple times.
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*
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* Possible options:
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*
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* once: will ensure the callback list can only be fired once (like a Deferred)
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*
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* memory: will keep track of previous values and will call any callback added
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* after the list has been fired right away with the latest "memorized"
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* values (like a Deferred)
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*
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* unique: will ensure a callback can only be added once (no duplicate in the list)
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*
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* stopOnFalse: interrupt callings when a callback returns false
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*
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*/
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jQuery.Callbacks = function( options ) {
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// Convert options from String-formatted to Object-formatted if needed
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// (we check in cache first)
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options = typeof options === "string" ?
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createOptions( options ) :
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jQuery.extend( {}, options );
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var // Flag to know if list is currently firing
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firing,
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// Last fire value for non-forgettable lists
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memory,
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// Flag to know if list was already fired
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fired,
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// Flag to prevent firing
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locked,
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// Actual callback list
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list = [],
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// Queue of execution data for repeatable lists
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queue = [],
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// Index of currently firing callback (modified by add/remove as needed)
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firingIndex = -1,
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// Fire callbacks
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fire = function() {
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// Enforce single-firing
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locked = locked || options.once;
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// Execute callbacks for all pending executions,
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// respecting firingIndex overrides and runtime changes
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fired = firing = true;
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for ( ; queue.length; firingIndex = -1 ) {
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memory = queue.shift();
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while ( ++firingIndex < list.length ) {
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// Run callback and check for early termination
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if ( list[ firingIndex ].apply( memory[ 0 ], memory[ 1 ] ) === false &&
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options.stopOnFalse ) {
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// Jump to end and forget the data so .add doesn't re-fire
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firingIndex = list.length;
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memory = false;
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}
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}
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}
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// Forget the data if we're done with it
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if ( !options.memory ) {
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memory = false;
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}
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firing = false;
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// Clean up if we're done firing for good
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if ( locked ) {
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// Keep an empty list if we have data for future add calls
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if ( memory ) {
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list = [];
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// Otherwise, this object is spent
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} else {
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list = "";
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}
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}
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},
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// Actual Callbacks object
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self = {
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// Add a callback or a collection of callbacks to the list
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add: function() {
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if ( list ) {
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// If we have memory from a past run, we should fire after adding
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if ( memory && !firing ) {
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firingIndex = list.length - 1;
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queue.push( memory );
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}
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( function add( args ) {
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jQuery.each( args, function( _, arg ) {
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if ( isFunction( arg ) ) {
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if ( !options.unique || !self.has( arg ) ) {
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list.push( arg );
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}
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} else if ( arg && arg.length && toType( arg ) !== "string" ) {
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// Inspect recursively
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add( arg );
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}
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} );
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} )( arguments );
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if ( memory && !firing ) {
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fire();
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}
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}
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return this;
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},
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// Remove a callback from the list
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remove: function() {
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jQuery.each( arguments, function( _, arg ) {
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var index;
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while ( ( index = jQuery.inArray( arg, list, index ) ) > -1 ) {
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list.splice( index, 1 );
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// Handle firing indexes
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if ( index <= firingIndex ) {
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firingIndex--;
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}
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}
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} );
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return this;
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},
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// Check if a given callback is in the list.
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// If no argument is given, return whether or not list has callbacks attached.
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has: function( fn ) {
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return fn ?
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jQuery.inArray( fn, list ) > -1 :
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list.length > 0;
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},
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// Remove all callbacks from the list
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empty: function() {
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if ( list ) {
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list = [];
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}
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return this;
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},
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// Disable .fire and .add
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// Abort any current/pending executions
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// Clear all callbacks and values
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disable: function() {
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locked = queue = [];
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list = memory = "";
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return this;
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},
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disabled: function() {
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return !list;
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},
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// Disable .fire
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// Also disable .add unless we have memory (since it would have no effect)
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// Abort any pending executions
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lock: function() {
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locked = queue = [];
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if ( !memory && !firing ) {
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list = memory = "";
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}
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return this;
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},
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locked: function() {
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return !!locked;
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},
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// Call all callbacks with the given context and arguments
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fireWith: function( context, args ) {
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if ( !locked ) {
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args = args || [];
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args = [ context, args.slice ? args.slice() : args ];
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queue.push( args );
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if ( !firing ) {
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fire();
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}
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}
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return this;
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},
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// Call all the callbacks with the given arguments
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fire: function() {
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self.fireWith( this, arguments );
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return this;
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},
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// To know if the callbacks have already been called at least once
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fired: function() {
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return !!fired;
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}
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};
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return self;
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};
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return jQuery;
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} );
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