Web site developers - 762 Graphical User Interface Components: Part 2 Chapter
762 Graphical User Interface Components: Part 2 Chapter 13 Class UIManager (package javax.swing) contains publicstatic inner class LookAndFeelInfo that is used to maintain information about a look-and-feel. Line 14 declares an array of type UIManager.LookAndFeelInfo (notice the syntax used to access the inner class LookAndFeelInfo). Line 71 uses static method getInstalledLookAndFeels of class UIManager to get the array of UIManager.LookAndFeelInfo objects that describe the installed look-and-feels. Performance Tip 13.1 Each look-and-feel is represented by a Java class. UIManager method getInstalled- LookAndFeels does not load each class. Rather, it provides access to the names of each look-and-feel, so a choice of look-and-feel can be made (presumably one time at program startup). This reduces the overhead of loading additional classes that the program will not use. Utility method changeTheLookAndFeel (lines 80 93) is called by the event handler (defined in private inner class ItemHandler at lines 105 121) for the JRadioButtons at the bottom of the user interface. The event handler passes an integer representing the element in array looks that should be used to change the look-and-feel. Lines 84 85 use static method setLookAndFeel of class UIManager to change the look-and-feel. Method getClassName of class UIManager.LookAnd- FeelInfo determines the name of the look-and-feel class that corresponds to the UIManager.LookAndFeelInfo. If the look-and-feel class is not already loaded, it will be loaded as part of the call to setLookAndFeel. Line 86 uses static method updateComponentTreeUI of class SwingUtilities (package javax.swing) to change the look-and-feel of every component attached to its argument (this instance of class LookAndFeelDemo) to the new look-and-feel. The preceding two statements appear in a special block of code called a try block. This code is part of the exception-handling mechanism discussed in detail in the next chapter. This code is required in case lines 84 85 attempt to change the look-and-feel to a look-and-feel that does not exist. Lines 90 92 complete the exception-handling mechanism with a catchhandler that simply processes this problem (if it occurs) by printing an error message at the command line. 13.11 Using JDesktopPaneand JInternalFrame Many of today s applications use a multiple document interface (MDI) [i.e., a main window (often called the parent window) containing other windows (often called child windows)] to manage several open documents that are being processed in parallel. For example, many e-mail programs allow you to have several e-mail windows open at the same time so you can compose and/or read multiple e-mail messages. Similarly, many word processors allow the user to open multiple documents in separate windows so the user can switch between the documents without having to close the current document to open another document. The program of Fig. 13.13 demonstrates Swing s JDesktopPane and JInternal- Frame classes, which provide support for creating multiple document interfaces. The child windows simply display an image of the cover of this book. Lines 20 27 define a JMenuBar, a JMenu and a JMenuItem, add the JMenuItem to the JMenu, add the JMenu to the JMenuBarand set the JMenuBar for the application window. When the user selects the JMenuItemnewFrame, the program creates and displays a new JInternalFrame.
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