Java Foundation Classes in a Nutshell

Figur e 3−2: Swing bor der styles

ally. Its

paintIcon() method is called to display the graphic, and this method can

do anything necessary to display it.

Swing includes an

Icon implementation called ImageIcon. This commonly used

class is an

Image-based implementation of Icon. ImageIcon also simplifies the pro-

cess of reading images from external files. One of the constructors for

ImageIcon

simply takes the name of the desired image file.

Arelated utility function is the static method

GrayFilter.createDisabledImage().

This version produces a grayed-out version of a given

Image, which can be used

to create an

ImageIcon that repr esents a disabled action or capability.

Cur sor s

The cursor, or mouse pointer, is the graphic that appears on the screen and tracks

the position of the mouse. Java support for cursors has evolved in each Java

release. Java 1.0 and 1.1 included 14 predefined cursors but did not support cus-

tom cursors. In Java 1.0, the predefined cursors were repr esented by constants

defined by

java.awt.Frame and they could be specified only for these top-level

Frame components. These Frame constants and the corresponding setCursor()

method of Frame ar e now deprecated.

Swing Prog.

Topics

Cursors 35

13 September 1999 17:55

Java 1.1 included a new java.awt.Cursor class and defined a new setCursor()

method for ...