Class ImageScroller 

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----Scroller
                                   |
                                   +----ImageScroller
public class ImageScroller
extends Scroller
A scrollable image component. This class extends the abstract class Scroller by implementing two methods: getScrollAreaSize which returns the image size, and scrollTo which translates the appropriate image area to the scroller's viewport. Based on class ImageScroller from "Graphic Java 1.1" p. 802. An alternative is ScrollPane. Java 1.1 Implementation

See Also:
getScrollAreaSize, scrollTo, Scroller, ScrollPane, Panel

Constructor Index

o ImageScroller(Image)
Construction from an image.
o ImageScroller(ImageCanvas)
Construction from an ImageCanvas.

Method Index

o getImage()
Return the image.
o getScrollAreaSize()
Report the size of the image being scrolled.
o scrollTo(int, int)
Scroll to position (x,y).
o setImage(Image)
Set the image to be scrolled.

Constructors

o ImageScroller 
 public ImageScroller(Image image)
Construction from an image. The layout manager is set to BorderLayout so that a large image will be displayed with scrollbars. If a large image is displayed according to its preferred size then it may not activate the scrollbars and consequently may be clipped (FlowLayout uses preferred sizes); the image will be centered in the ImageScroller container.

See Also:
BorderLayout
o ImageScroller 
 public ImageScroller(ImageCanvas imageCanvas)
Construction from an ImageCanvas. Adding an EventListener to an ImageScroller object does not work well because most of the screen area is consumed by the image. Adding a listener to an existing ImageCanvas object and then constructing an ImageScroller object is one solution. Another is a constructor which has a EventListener argument. The layout manager is set to BorderLayout so that a large image will be displayed with scrollbars. If a large image is displayed according to its preferred size then it may not activate the scrollbars and consequently may be clipped (FlowLayout uses preferred sizes); the image will be centered in the ImageScroller container.

See Also:
ImageCanvas, EventListener, BorderLayout

Methods

o getImage 
 public Image getImage()
Return the image.

Returns:
the image.
o getScrollAreaSize 
 public Dimension getScrollAreaSize()
Report the size of the image being scrolled.

Returns:
the Dimension of the image being scrolled.
Overrides:
getScrollAreaSize in class Scroller
o setImage 
 public void setImage(Image image)
Set the image to be scrolled.

Parameters:
image - the image to be scrolled.
o scrollTo 
 protected void scrollTo(int x,
                         int y)
Scroll to position (x,y). This method performs the work of scrolling to a particular location.

Parameters:
x - the value of the horizontal scrollbar.
y - the value of the vertical scrollbar.
Overrides:
scrollTo in class Scroller