31.9. TreeModel and DefaultTreeModel

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28.6. JTabbedPane

JTabbedPane is a useful Swing container that provides a set of mutually exclusive tabs for accessing multiple components , as shown in Figure 28.20.

Figure 28.20. JTabbedPane displays components through the tabs.

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Usually you place the panels inside a JTabbedPane and associate a tab with each panel. JTabbedPane is easy to use, because the selection of the panel is handled automatically by clicking the corresponding tab. You can switch between a group of panels by clicking on a tab with a given title and/or icon. Figure 28.21 shows the frequently used properties, constructors, and methods in JTabbedPane .

Figure 28.21. JTabbedPane provides methods for displaying and manipulating the components in the tabbed pane.

Listing 28.10 gives an example that uses a tabbed pane with four tabs to display four types of figures: line, rectangle, rounded rectangle, and oval. You can select a figure to display by clicking the corresponding tab, as shown in Figure 28.20. The FigurePanel class for displaying a figure was presented in §13.7, "Case Study: The FigurePanel Class." You can use the type property to specify a figure type.

Listing 28.10. DisplayFigure.java

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 1   import   java.awt.*; 2   import   javax.swing.*; 3 4   public class   DisplayFigure   extends   JApplet { 5    private   JTabbedPane jtpFigures =   new   JTabbedPane();  6   private   FigurePanel squarePanel =   new   FigurePanel(); 7   private   FigurePanel rectanglePanel =   new   FigurePanel(); 8   private   FigurePanel circlePanel =   new   FigurePanel(); 9   private   FigurePanel ovalPanel =   new   FigurePanel(); 10 11   public   DisplayFigure() { 12 squarePanel.setType(FigurePanel.LINE); 13 rectanglePanel.setType(FigurePanel.RECTANGLE); 14 circlePanel.setType(FigurePanel.ROUND_RECTANGLE); 15 ovalPanel.setType(FigurePanel.OVAL); 

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 16 17 add(jtpFigures, BorderLayout.CENTER); 18 jtpFigures.add(squarePanel,   "Line"   ); 19 jtpFigures.add(rectanglePanel,   "Rectangle"   ); 20 jtpFigures.add(circlePanel,   "Round Rectangle"   ); 21 jtpFigures.add(ovalPanel,   "Oval"   ); 22 23 jtpFigures.setToolTipTextAt(     ,   "Line"   ); 24 jtpFigures.setToolTipTextAt(   1   ,   "Rectangle"   ); 25 jtpFigures.setToolTipTextAt(   2   ,   "Round Rectangle"   ); 26 jtpFigures.setToolTipTextAt(   3   ,   "Oval"   ); 27 } 28 } 

The program creates a tabbed pane to hold four panels, each of which displays a figure. A panel is associated with a tab. The tabs are titled Line, Rectangle, Rounded Rectangle, and Oval.

By default, the tabs are placed at the top of the tabbed pane. You can select a different placement using the tabPlacement property.