Root Pane Containers - The Definitive Guide to Java Swing - page 249

Table 8-9. JInternalFrame Properties (Continued)

Property Name Data Type Access

layout LayoutManager Write-only

maximizable boolean Read-write bound

maximum boolean Read-write bound constrained

mostRecentFocusOwner Component Read-only

normalBounds Rectangle Read-write

resizable boolean

Read-write bound

rootPane JRootPane Read-only bound

selected boolean Read-write bound constrained

title String

Read-write bound

UI InternalFrameUI Read-write

UIClassID String Read-only

warningString String Read-only

The initial defaultCloseOperation property setting for a JInternalFrame is DISPOSE_ON_CLOSE
for Java 1.3 releases and later. Earlier releases had a default setting of HIDE_ON_CLOSE . You can
set this property to any of the WindowConstants settings shown earlier in Table 8-6.
The normalBounds property describes where an iconified internal frame would appear
when deiconified. The focusOwner property provides the actual Component with the input focus
when the specific JInternalFrame is active.
The JInternalFrame contains the only four constrained properties within the Swing classes:
closed , icon , maximum , and selected . They're directly related to the four boolean constructor
parameters. Each allows you to check on the current state of the property as well as change its
setting. However, because the properties are constrained, whenever you try to set one, the
attempt must be in a try-catch block, catching PropertyVetoException :

try {
// Try to iconify internal frame
internalFrame.setIcon(false);
} catch (PropertyVetoException propertyVetoException) {
System.out.println("Rejected");
}

To help you work with some of the bound properties, the JInternalFrame class defines
11 constants, as listed in Table 8-10. They represent the string that should be returned by
getPropertyName() for a PropertyChangeEvent within a PropertyChangeListener .