| Package | mx.collections |
| Interface | public interface ISortField |
| Implementors | SortField, SortField |
| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
ISortField interface defines the interface for classes that
are used with ISort classes, to provide the sorting information
required to sort the specific fields or property in a collection view.
| Property | Defined By | ||
|---|---|---|---|
| arraySortOnOptions : int [read-only]
This helper property is used internally by the findItem()
and sort() methods. | ISortField | ||
| compareFunction : Function
The function that compares two items during a sort of items for the
associated collection. | ISortField | ||
| descending : Boolean
Specifies whether this field should be sorted in descending
order. | ISortField | ||
| name : String
The name of the field to be sorted. | ISortField | ||
| 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. | ISortField | ||
| usingCustomCompareFunction : Boolean [read-only]
True if this ISortField uses a custom comparator function. | ISortField | ||
| Method | Defined By | ||
|---|---|---|---|
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. | ISortField | ||
Reverse the criteria for this sort field. | ISortField | ||
arraySortOnOptions | property |
arraySortOnOptions:int [read-only] | Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | 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..
Implementation
public function get arraySortOnOptions():intcompareFunction | property |
compareFunction:Function| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | 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 ISortField
objects.
The compare function must have the following signature:
function myCompare(a:Object, b:Object):int
This function returns the following values:
- -1, if
ashould appear beforebin the sorted sequence - 0, if
aequalsb - 1, if
ashould appear afterbin the sorted sequence
Implementation
public function get compareFunction():Function public function set compareFunction(value:Function):voiddescending | property |
descending:Boolean| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | Flash Player 9, AIR 1.1 |
Specifies whether this field should be sorted in descending order.
The default value is false (ascending).
Implementation
public function get descending():Boolean public function set descending(value:Boolean):voidname | property |
numeric | property |
numeric:Object| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | 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.
The default value is null.
Implementation
public function get numeric():Object public function set numeric(value:Object):voidusingCustomCompareFunction | property |
initializeDefaultCompareFunction | () | method |
public function initializeDefaultCompareFunction(obj:Object):void| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | 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 | () | method |
public function reverse():void| Language Version: | ActionScript 3.0 |
| Product Version: | Flex 4.5 |
| Runtime Versions: | 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 Nov 21 2018, 06:34 AM -08:00