public abstract class ImageFactory

  1. Object
  2. ImageFactory

A factory class for creating mutable images. This can be used to override how mutable images are generated. You can use this to implement, for example, a LRU cache for images so that they can be reused to conserve memory.

There is a default static image factory that can be assigned by calling:

`ImageFactory.setImageFactory(null, new ImageFactory() {
     public Image createImage(int w, int h, int bgColor) {
         // create an image
         // The Default would be just to call
         return Image.createImage(w, h, bgColor);`
});
}

You can also assign a factory whose scope is limited to a particular Form, Container, or Component, by setting the context argument in setImageFactory().

Constructors

public ImageFactory()

Methods

public static ImageFactory getImageFactory(Component cmp)Gets the image factory for a given component.
public static ImageFactory setImageFactory(Component cmp, ImageFactory f)Sets the ImageFactory for the given component.
public static Image createImage(Component context, int w, int h, int bgColor)Creates an image using the factory at a given context.
public abstract Image createImage(int w, int h, int bgColor)

Inherited methods

From Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait, clone

Constructor details

ImageFactory

public ImageFactory()

Method details

getImageFactory

public static ImageFactory getImageFactory(Component cmp)

Gets the image factory for a given component. If the component doesn’t have an ImageFactory assigned, then it will check the parent container, and its descendants, until it finds a Component with an ImageFactory.

If none of the component’s descendants have an ImageFactory, then it will use the default global ImageFactory.

Parameters

cmp Component
The context from which to load the image factory. Use null to get the global default factory.

Returns

An image Factory

setImageFactory

public static ImageFactory setImageFactory(Component cmp, ImageFactory f)
Sets the ImageFactory for the given component.

Parameters

cmp Component
The component to set the ImageFactory for. If this parameter is null, then this method will set the default global ImageFactory
f ImageFactory
The ImageFactory to assign to the component.

Returns

The previous image factory that was assigned to the component, or null if none was previously assigned.

createImage

public static Image createImage(Component context, int w, int h, int bgColor)
Creates an image using the factory at a given context.

Parameters

context Component
The context where the ImageFactory should be loaded from.
w int
The width of the image to create.
h int
The height of the image to create.
bgColor int
The background color of the image.

Returns

A mutable Image.

createImage

public abstract Image createImage(int w, int h, int bgColor)