queue.js
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define( [
"./core",
"./data/var/dataPriv",
"./deferred",
"./callbacks"
], function( jQuery, dataPriv ) {
"use strict";
jQuery.extend( {
queue: function( elem, type, data ) {
var queue;
if ( elem ) {
type = ( type || "fx" ) + "queue";
queue = dataPriv.get( elem, type );
// Speed up dequeue by getting out quickly if this is just a lookup
if ( data ) {
if ( !queue || Array.isArray( data ) ) {
queue = dataPriv.access( elem, type, jQuery.makeArray( data ) );
} else {
queue.push( data );
}
}
return queue || [];
}
},
dequeue: function( elem, type ) {
type = type || "fx";
var queue = jQuery.queue( elem, type ),
startLength = queue.length,
fn = queue.shift(),
hooks = jQuery._queueHooks( elem, type ),
next = function() {
jQuery.dequeue( elem, type );
};
// If the fx queue is dequeued, always remove the progress sentinel
if ( fn === "inprogress" ) {
fn = queue.shift();
startLength--;
}
if ( fn ) {
// Add a progress sentinel to prevent the fx queue from being
// automatically dequeued
if ( type === "fx" ) {
queue.unshift( "inprogress" );
}
// Clear up the last queue stop function
delete hooks.stop;
fn.call( elem, next, hooks );
}
if ( !startLength && hooks ) {
hooks.empty.fire();
}
},
// Not public - generate a queueHooks object, or return the current one
_queueHooks: function( elem, type ) {
var key = type + "queueHooks";
return dataPriv.get( elem, key ) || dataPriv.access( elem, key, {
empty: jQuery.Callbacks( "once memory" ).add( function() {
dataPriv.remove( elem, [ type + "queue", key ] );
} )
} );
}
} );
jQuery.fn.extend( {
queue: function( type, data ) {
var setter = 2;
if ( typeof type !== "string" ) {
data = type;
type = "fx";
setter--;
}
if ( arguments.length < setter ) {
return jQuery.queue( this[ 0 ], type );
}
return data === undefined ?
this :
this.each( function() {
var queue = jQuery.queue( this, type, data );
// Ensure a hooks for this queue
jQuery._queueHooks( this, type );
if ( type === "fx" && queue[ 0 ] !== "inprogress" ) {
jQuery.dequeue( this, type );
}
} );
},
dequeue: function( type ) {
return this.each( function() {
jQuery.dequeue( this, type );
} );
},
clearQueue: function( type ) {
return this.queue( type || "fx", [] );
},
// Get a promise resolved when queues of a certain type
// are emptied (fx is the type by default)
promise: function( type, obj ) {
var tmp,
count = 1,
defer = jQuery.Deferred(),
elements = this,
i = this.length,
resolve = function() {
if ( !( --count ) ) {
defer.resolveWith( elements, [ elements ] );
}
};
if ( typeof type !== "string" ) {
obj = type;
type = undefined;
}
type = type || "fx";
while ( i-- ) {
tmp = dataPriv.get( elements[ i ], type + "queueHooks" );
if ( tmp && tmp.empty ) {
count++;
tmp.empty.add( resolve );
}
}
resolve();
return defer.promise( obj );
}
} );
return jQuery;
} );