Pakket | mx.collections |
Klasse | public class SortField |
Overerving | SortField EventDispatcher Object |
Implementatie | ISortField |
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
spark.collections.SortField |
Provides the sorting information required to establish a sort on a field or property in a collection view. The SortField class is meant to be used with the Sort class. Typically the sort is defined for collections of complex items, that is items in which the sort is performed on properties of those objects. As in the following example:
var col:ICollectionView = new ArrayCollection();
col.addItem({first:"Anders", last:"Dickerson"});
var sort:Sort = new Sort();
sort.fields = [new SortField("first", true)];
col.sort = sort;
There are situations in which the collection contains simple items, like
String
, Date
, Boolean
, etc.
In this case, sorting should be applied to the simple type directly.
When constructing a sort for this situation only a single sort field is
required and should not have a name
specified.
For example:
var col:ICollectionView = new ArrayCollection();
col.addItem("California");
col.addItem("Arizona");
var sort:Sort = new Sort();
sort.fields = [new SortField(null, true)];
col.sort = sort;
By default the comparison provided by the SortField class does
not provide correct language specific
sorting for strings. For this type of sorting please see the
spark.collections.Sort
and
spark.collections.SortField
classes.
The <mx:SortField>
tag has the following attributes:
<mx:SortField Properties caseInsensitive="false" compareFunction="Internal compare function" descending="false" name="null" numeric="null" />
Verwante API-elementen
Eigenschap | Gedefinieerd door | ||
---|---|---|---|
arraySortOnOptions : int [alleen-lezen]
This helper property is used internally by the findItem()
and sort() methods. | SortField | ||
caseInsensitive : Boolean
Specifies whether the sort for this field should be case insensitive. | SortField | ||
compareFunction : Function
The function that compares two items during a sort of items for the
associated collection. | SortField | ||
constructor : Object
Verwijzing naar het klasseobject of de constructorfunctie van een bepaalde objectinstantie. | Object | ||
descending : Boolean
Specifies whether this field should be sorted in descending
order. | SortField | ||
name : String
The name of the field to be sorted. | SortField | ||
numeric : Object
Specifies that if the field being sorted contains numeric
(number/int/uint) values, or string representations of numeric values,
the comparator use a numeric comparison. | SortField | ||
usingCustomCompareFunction : Boolean [alleen-lezen]
True if this ISortField uses a custom comparator function. | SortField |
Methode | Gedefinieerd door | ||
---|---|---|---|
SortField(name:String = null, caseInsensitive:Boolean = false, descending:Boolean = false, numeric:Object = null)
Constructor. | SortField | ||
addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void
Registreert een gebeurtenislistenerobject bij een object EventDispatcher, zodat de listener een melding van een gebeurtenis ontvangt. | EventDispatcher | ||
Verzendt een gebeurtenis naar de gebeurtenisstroom. | EventDispatcher | ||
Controleert of het object EventDispatcher listeners heeft geregistreerd voor een specifiek type gebeurtenis. | EventDispatcher | ||
Geeft aan of voor een object een opgegeven eigenschap is gedefinieerd. | Object | ||
A helper function called by the Sort class to set the
default comparison function to perform a comparison based on
one of three things: whether or not a custom compare function has
been set, the data type for the specified field or the the value of the
numeric property. | SortField | ||
Geeft aan of een instantie van de klasse Object zich in de prototypeketen van het object bevindt dat als parameter is opgegeven. | Object | ||
Geeft aan of de opgegeven eigenschap bestaat en kan worden opgesomd. | Object | ||
Verwijdert een listener uit het object EventDispatcher. | EventDispatcher | ||
Reverse the criteria for this sort field. | SortField | ||
Stelt de beschikbaarheid van een dynamische eigenschap voor lusbewerkingen in. | Object | ||
Geeft de tekenreeksweergave van dit object weer, geformatteerd volgens de locatiespecifieke conventies. | Object | ||
Retourneert een tekenreeksrepresentatie van het opgegeven object. | Object | ||
Retourneert de primitieve waarde van het opgegeven object. | Object | ||
Controleert of een gebeurtenislistener is geregistreerd bij dit object EventDispatcher of een van de voorouders voor het opgegeven type gebeurtenis. | EventDispatcher |
arraySortOnOptions | eigenschap |
arraySortOnOptions:int
[alleen-lezen] Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
This helper property is used internally by the findItem()
and sort()
methods. Other uses of this property are not
supported.
Returns -1 if this ISortField shouldn't be used by the Sort
class to sort the field (there is no compareFunction or no name). Otherwise, returns a bitmask of sort options..
Implementatie
public function get arraySortOnOptions():int
caseInsensitive | eigenschap |
caseInsensitive:Boolean
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
Specifies whether the sort for this field should be case insensitive.
De standaardwaarde is false.
Deze eigenschap kan als de bron voor gegevensbinding worden gebruikt. Wanneer deze eigenschap wordt gewijzigd, wordt de gebeurtenis caseInsensitiveChanged
verzonden.
Implementatie
public function get caseInsensitive():Boolean
public function set caseInsensitive(value:Boolean):void
compareFunction | eigenschap |
compareFunction:Function
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
The function that compares two items during a sort of items for the
associated collection. If you specify a compareFunction
property in an ISort object, Flex ignores any
compareFunction
properties of the ISort's SortField
objects.
The compare function must have the following signature:
function myCompare(a:Object, b:Object):int
This function must return the following values:
- -1, if
a
should appear beforeb
in the sorted sequence - 0, if
a
equalsb
- 1, if
a
should appear afterb
in the sorted sequence
The default value is an internal compare function that can perform a string, numeric, or date comparison in ascending or descending order, with case-sensitive or case-insensitive string comparisons. Specify your own function only if you need a need a custom comparison algorithm. This is normally only the case if a calculated field is used in a display.
Note if you need, language specific sorting then consider using thespark.collections.SortField
class.
Implementatie
public function get compareFunction():Function
public function set compareFunction(value:Function):void
Verwante API-elementen
descending | eigenschap |
descending:Boolean
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
Specifies whether this field should be sorted in descending order.
The default value is false
(ascending).
Deze eigenschap kan als de bron voor gegevensbinding worden gebruikt. Wanneer deze eigenschap wordt gewijzigd, wordt de gebeurtenis descendingChanged
verzonden.
Implementatie
public function get descending():Boolean
public function set descending(value:Boolean):void
name | eigenschap |
name:String
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
The name of the field to be sorted.
De standaardwaarde is null.
Deze eigenschap kan als de bron voor gegevensbinding worden gebruikt. Wanneer deze eigenschap wordt gewijzigd, wordt de gebeurtenis nameChanged
verzonden.
Implementatie
public function get name():String
public function set name(value:String):void
numeric | eigenschap |
numeric:Object
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
Specifies that if the field being sorted contains numeric
(number/int/uint
) values, or string representations of numeric values,
the comparator use a numeric comparison.
This property is used by SortField
class in case custom compare
function is not provided.
If this property is true
, the built-in numeric compare
function is used. Each of data items is cast to a
Number()
function before the comparison.
If this property is false
, the built-in string compare
function is used. Each of data items is cast to a
String()
function before the comparison.
If this property is null
, the first data item
is introspected to see if it is a number or string and the sort
proceeds based on that introspection.
De standaardwaarde is null.
Deze eigenschap kan als de bron voor gegevensbinding worden gebruikt. Wanneer deze eigenschap wordt gewijzigd, wordt de gebeurtenis numericChanged
verzonden.
Implementatie
public function get numeric():Object
public function set numeric(value:Object):void
usingCustomCompareFunction | eigenschap |
SortField | () | Constructor |
public function SortField(name:String = null, caseInsensitive:Boolean = false, descending:Boolean = false, numeric:Object = null)
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
Constructor.
Parametersname:String (default = null ) — The name of the property that this field uses for
comparison.
If the object is a simple type, pass null .
| |
caseInsensitive:Boolean (default = false ) — When sorting strings, tells the comparator
whether to ignore the case of the values.
| |
descending:Boolean (default = false ) — Tells the comparator whether to arrange items in
descending order.
| |
numeric:Object (default = null ) — Tells the comparator whether to compare sort items as
numbers, instead of alphabetically.
|
initializeDefaultCompareFunction | () | methode |
public function initializeDefaultCompareFunction(obj:Object):void
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
A helper function called by the Sort
class to set the
default comparison function to perform a comparison based on
one of three things: whether or not a custom compare function has
been set, the data type for the specified field or the the value of the
numeric property. If the the numeric
property is true,
then a numeric comparison will be performed when sorting.
Parameters
obj:Object — The object that contains the data. If the field name has
been set with the name property, then the name will be used to access
the data value from this object. Otherwise the object itself will
be used as the data value.
|
reverse | () | methode |
public function reverse():void
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
Reverse the criteria for this sort field. If the field was sorted in descending order, for example, sort it in ascending order.
NOTE: An ICollectionView
does not automatically
update when the ISortFields
are modified; call its
refresh()
method to update the view.
Wed Jun 13 2018, 11:42 AM Z