Pakket | mx.core |
Klasse | public class ClassFactory |
Overerving | ClassFactory Object |
Implementatie | IFactory |
Subklassen | ButtonBarButtonClassFactory, ContextualClassFactory |
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
You specify a generator
class when you construct
the factory object.
Then you set the properties
property on the factory object.
Flex uses the factory object to generate instances by calling
the factory object's newInstance()
method.
The newInstance()
method creates a new instance
of the generator
class, and sets the properties specified
by properties
in the new instance.
If you need to further customize the generated instances,
you can override the newInstance()
method.
The ClassFactory class implements the IFactory interface.
Therefore it lets you create objects that can be assigned to properties
of type IFactory, such as the itemRenderer
property of a List control
or the itemEditor
property of a DataGrid control.
For example, suppose you write an item renderer class named
ProductRenderer containing
a showProductImage
property which can be true
or false
.
If you want to make a List control use this renderer, and have each renderer
instance display a product image, you would write the following code:
var productRenderer:ClassFactory = new ClassFactory(ProductRenderer); productRenderer.properties = { showProductImage: true }; myList.itemRenderer = productRenderer;
The List control calls the newInstance()
method on the
itemRenderer
to create individual instances of ProductRenderer,
each with showProductImage
property set to true
.
If you want a different List control to omit the product images, you use
the ProductRenderer class to create another ClassFactory
with the properties
property set to
{ showProductImage: false }
.
Using the properties
property to configure the instances
can be powerful, since it allows a single generator class to be used
in different ways.
However, it is very common to create non-configurable generator classes
which require no properties to be set.
For this reason, MXML lets you use the following syntax:
<mx:List id="myList" itemRenderer="ProductRenderer">
The MXML compiler automatically creates the ClassFactory instance for you.
Verwante API-elementen
Eigenschap | Gedefinieerd door | ||
---|---|---|---|
constructor : Object
Verwijzing naar het klasseobject of de constructorfunctie van een bepaalde objectinstantie. | Object | ||
generator : Class
The Class that the newInstance() method uses
to generate objects from this factory object. | ClassFactory | ||
properties : Object = null
An Object whose name/value pairs specify the properties to be set
on each object generated by the newInstance() method. | ClassFactory |
Methode | Gedefinieerd door | ||
---|---|---|---|
ClassFactory(generator:Class = null)
Constructor. | ClassFactory | ||
Geeft aan of voor een object een opgegeven eigenschap is gedefinieerd. | Object | ||
Geeft aan of een instantie van de klasse Object zich in de prototypeketen van het object bevindt dat als parameter is opgegeven. | Object | ||
newInstance():*
Creates a new instance of the generator class,
with the properties specified by properties. | ClassFactory | ||
Geeft aan of de opgegeven eigenschap bestaat en kan worden opgesomd. | Object | ||
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 |
generator | eigenschap |
public var generator:Class
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
The Class that the newInstance()
method uses
to generate objects from this factory object.
properties | eigenschap |
public var properties:Object = null
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
An Object whose name/value pairs specify the properties to be set
on each object generated by the newInstance()
method.
For example, if you set properties
to
{ text: "Hello", width: 100 }
, then every instance
of the generator
class that is generated by calling
newInstance()
will have its text
set to
"Hello"
and its width
set to
100
.
De standaardwaarde is null.
ClassFactory | () | Constructor |
newInstance | () | methode |
public function newInstance():*
Taalversie: | ActionScript 3.0 |
Productversie: | Flex 3 |
Runtimeversies: | Flash Player 9, AIR 1.1 |
Creates a new instance of the generator
class,
with the properties specified by properties
.
This method implements the newInstance()
method
of the IFactory interface.
* — The new instance that was created.
|
Wed Jun 13 2018, 11:42 AM Z