public abstract class CompositeImageDescriptor extends ImageDescriptor
Subclasses must implement the getSize
and
fill
methods. Little or no work happens
until the image descriptor's image is actually requested
by a call to createImage
(or to
getImageData
directly).
DEFAULT_IMAGE_DATA
Modifier | Constructor and Description |
---|---|
protected |
CompositeImageDescriptor()
Constructs an uninitialized composite image.
|
Modifier and Type | Method and Description |
---|---|
protected abstract void |
drawCompositeImage(int width,
int height)
Draw the composite images.
|
protected void |
drawImage(ImageData src,
int ox,
int oy)
Draws the given source image data into this composite
image at the given position.
|
ImageData |
getImageData()
Creates and returns a new SWT
ImageData object
for this image descriptor. |
protected abstract Point |
getSize()
Return the size of this composite image.
|
createFromFile, createFromImage, createFromImage, createFromImageData, createFromURL, createImage, createImage, createImage, createImage, createResource, createWithFlags, destroyResource, getMissingImageDescriptor
protected CompositeImageDescriptor()
protected abstract void drawCompositeImage(int width, int height)
Subclasses must implement this framework method
to paint images within the given bounds using
one or more calls to the drawImage
framework method.
width
- the widthheight
- the heightprotected final void drawImage(ImageData src, int ox, int oy)
Call this internal framework method to superimpose another image atop this composite image.
src
- the source image dataox
- the x positionoy
- the y positionpublic ImageData getImageData()
ImageDescriptor
ImageData
object
for this image descriptor.
Note that each call returns a new SWT image data object.
This framework method is declared public so that it is possible to request an image descriptor's image data without creating an SWT image object.
Returns null
if the image data could not be created.
getImageData
in class ImageDescriptor
null
protected abstract Point getSize()
Subclasses must implement this framework method.
Guidelines for using Eclipse APIs. Copyright (c) IBM Corp. and others 2000, 2006. All rights reserved.