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Java Swing, 2nd Edition
book

Java Swing, 2nd Edition

by Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
November 2002
Intermediate to advanced
1280 pages
38h 26m
English
O'Reilly Media, Inc.
Content preview from Java Swing, 2nd Edition

The JDesktopPane Class

JDesktopPane is an extension of JLayeredPane, which uses a DesktopManager to control the placement and movement of frames. Figure 9-3 shows what JDesktopPane looks like in several L&Fs. Like its superclass, JLayeredPane has a null layout manager. Components added to it must be placed at absolute locations with absolute sizes because it is intended to house JInternalFrames, which rely on the user to determine their placement.

JDesktopPanes in four L&Fs

Figure 9-3. JDesktopPanes in four L&Fs

Another reason for using JDesktopPane is to allow pop-up dialog boxes to be displayed using JInternalFrames. This is discussed in detail in the next chapter.

Properties

Table 9-4 shows the properties defined by JDesktopPane. The allFrames property provides access to all JInternalFrames contained by the desktop. The desktopManager property holds the DesktopManager object supplied by the pane’s L&F. (We’ll cover the responsibilities of the DesktopManager in the next section.) The opaque property defaults to true for JDesktopPanes, and isOpaque( ) is overridden so that it always returns true. UI contains the DesktopPaneUI implementation, and UIClassID contains the class ID for JDesktopPane.

Table 9-4. JDesktopPane properties

Property

Data type

get

is

set

Default value

accessibleContext o

AccessibleContext

·

  

JDesktopPane.AccessibleJDesktopPane( )

allFrames

JInternalFrame[]

·

  

Empty array

desktopManager ...

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Publisher Resources

ISBN: 0596004087Errata Page