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Although the Swing component set is quite powerful, you are not limited to using it because Swing also lets you write directly into the display area of a frame, panel, or one of Swing s other components, such as JLabel Although many (perhaps most) uses of Swing will not involve drawing directly to the surface of a component, it is available for those
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applications that need this capability To write output directly to the surface of a component, you will use one or more drawing methods defined by the AWT, such as drawLine( ) or drawRect( ) Thus, most of the techniques and methods described in 23 also apply to Swing However, there are also some very important differences, and the process is discussed in detail in this section
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Swing s approach to painting is built on the original AWT-based mechanism, but Swing s implementation offers more finally grained control Before examining the specifics of Swing-based painting, it is useful to review the AWT-based mechanism that underlies it The AWT class Component defines a method called paint( ) that is used to draw output directly to the surface of a component For the most part, paint( ) is not called by your program (In fact, only in the most unusual cases should it ever be called by your program) Rather, paint( ) is called by the run-time system whenever a component must be rendered This situation can occur for several reasons For example, the window in which the component is displayed can be overwritten by another window and then uncovered Or, the window might be minimized and then restored The paint( ) method is also called when a program begins running When writing AWT-based code, an application will override paint( ) when it needs to write output directly to the surface of the component Because JComponent inherits Component, all Swing s lightweight components inherit the paint( ) method However, you will not override it to paint directly to the surface of a component The reason is that Swing uses a bit more sophisticated approach to painting that involves three distinct methods: paintComponent( ), paintBorder( ), and paintChildren( ) These methods paint the indicated portion of a component and divide the painting process into its three distinct, logical actions In a lightweight component, the original AWT method paint( ) simply executes calls to these methods, in the order just shown To paint to the surface of a Swing component, you will create a subclass of the component and then override its paintComponent( ) method This is the method that paints the interior of the component You will not normally override the other two painting methods When overriding paintComponent( ), the first thing you must do is call superpaintComponent( ), so that the superclass portion of the painting process takes place (The only time this is not required is when you are taking complete, manual control over how a component is displayed) After that, write the output that you want to display The paintComponent( ) method is shown here: protected void paintComponent(Graphics g) The parameter g is the graphics context to which output is written To cause a component to be painted under program control, call repaint( ) It works in Swing just as it does for the AWT The repaint( ) method is defined by Component Calling it causes the system to call paint( ) as soon as it is possible to do so Because painting is a time-consuming operation, this mechanism allows the run-time system to defer painting momentarily until some higher-priority task has completed, for example Of course, in Swing the call to paint( ) results in a call to paintComponent( ) Therefore, to output to the surface of a component, your program will store the output until paintComponent( ) is called Inside the overridden paintComponent( ), you will draw the stored output
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