ch.randelshofer.pdf.plaf.util

Class CachedPainter

java.lang.Object

ch.randelshofer.pdf.plaf.util.CachedPainter

Direct Known Subclasses:

CachedImageBevelBorder

public abstract class CachedPainter
extends java.lang.Object

A base class used for icons or images that are expensive to paint. A subclass will do the following:

1. Invoke paint when you want to paint the image, if you are implementing Icon you'll invoke this from paintIcon. The args argument is useful when additional state is needed.
2. Override paintToImage to render the image. The code that lives here is equivalent to what previously would go in paintIcon, for an Icon.

This class has been derived from javax.swing.plaf.metal.CachedPainter 1.2 04/02/15

Version:

2.0 2008-04-21 Only cache small images.
1.0 September 7, 2005 Created.

Author:

Werner Randelshofer

Constructor Summary

Constructors

Constructor and Description
CachedPainter(int cacheCount) Creates an instance of CachedPainter that will cache up to cacheCount images of this class.

Method Summary

Methods

Modifier and Type	Method and Description
protected java.awt.Image	createImage(java.awt.Component c, int w, int h, java.awt.GraphicsConfiguration config) Creates the image to cache.
protected void	paint(java.awt.Component c, java.awt.Graphics g, int x, int y, int w, int h, java.lang.Object[] args) Renders the cached image to the the passed in Graphic.
protected void	paintImage(java.awt.Component c, java.awt.Graphics g, int x, int y, int w, int h, java.awt.Image image, java.lang.Object[] args) Paints the image to the specified location.
protected abstract void	paintToImage(java.awt.Component c, java.awt.Graphics g, int w, int h, java.lang.Object[] args) Paints the representation to cache to the supplied Graphics.

Methods inherited from class java.lang.Object

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

Constructor Detail

CachedPainter

public CachedPainter(int cacheCount)

Creates an instance of CachedPainter that will cache up to cacheCount images of this class.

Parameters:

cacheCount - Max number of images to cache

Method Detail

paint

protected void paint(java.awt.Component c,
         java.awt.Graphics g,
         int x,
         int y,
         int w,
         int h,
         java.lang.Object[] args)

Renders the cached image to the the passed in Graphic. If there is no cached image paintToImage will be invoked. paintImage is invoked to paint the cached image.

paintToImage

protected abstract void paintToImage(java.awt.Component c,
                java.awt.Graphics g,
                int w,
                int h,
                java.lang.Object[] args)

Paints the representation to cache to the supplied Graphics.

Parameters:

c - Component painting to

g - Graphics to paint to

w - Width to paint to

h - Height to paint to

args - Arguments supplied to paint

paintImage

protected void paintImage(java.awt.Component c,
              java.awt.Graphics g,
              int x,
              int y,
              int w,
              int h,
              java.awt.Image image,
              java.lang.Object[] args)

Paints the image to the specified location.

Parameters:

c - Component painting to

g - Graphics to paint to

x - X coordinate to paint to

y - Y coordinate to paint to

w - Width to paint to

h - Height to paint to

image - Image to paint

args - Arguments supplied to paint

createImage

protected java.awt.Image createImage(java.awt.Component c,
                         int w,
                         int h,
                         java.awt.GraphicsConfiguration config)

Creates the image to cache. This returns an opaque image, subclasses that require translucency or transparency will need to override this method.

Parameters:

c - Component painting to

w - Width of image to create

h - Height to image to create

config - GraphicsConfiguration that will be rendered to, this may be null.