oreilly java swing : JTable 之 JTableHeader

15.3.9 The JTableHeader Class

The JTableHeader class is an extension of JComponent and serves as the header component for tables. It not only dictates the basic color and font used for the header, but also the resizability and relocatability of the columns in the table. If you have an appropriate renderer for the header, you can also enable tooltips for the header. An example of custom renderers appears in Chapter 16.

15.3.9.1 Properties

The JTableHeader class has the properties listed in Table 15-14.

Table 15-14. JTableHeader properties

Property

Data type

get

is

set

Default value

accessibleContexto	AccessibleContext	·			JTableHeader.AccessibleJTableHeader( )
columnModel	TableColumnModel	·		·	DefaultColumnModel( )
draggedColumn	TableColumn	·		·	null
draggedDistance	int	·		·	0
opaqueo	boolean		·	·	true
reorderingAllowed	boolean	·		·	true
resizingAllowed	boolean	·		·	true
resizingColumn	TableColumn	·		·	null
table	JTable	·		·	null
UIb	TableHeaderUI	·		·	From L&F
UIClassIDo	String	·			"TableHeaderUI"
updateTableInRealTime	boolean	·		·	true
bbound, ooverridden See also properties from the JComponent class (Table 3-6).

The columnModel property is the TableColumnModel in place for the header. This is normally set through the constructor during the JTable initializeLocalVars( ) call. The draggedColumn and resizingColumn properties return the TableColumn object that the user has moved or resized. You can control whether the user is allowed to move or resize columns using the reorderingAllowed and resizingAllowed properties. The updateTableInRealTime property dictates whether the column being moved or resized is visually updated during the move or after. If this property is false, only the column headers move until the action is complete, and then the table is updated. The table property represents the companion table for the header.