Zeus web server - 766 Graphical User Interface Components: Part 2 Chapter
766 Graphical User Interface Components: Part 2 Chapter 13 Line 30 creates JDesktopPane (package javax.swing) reference the- Desktop and assigns it a new JDesktopPane object. The JDesktopPane object manages the JInternalFramechild windows displayed in the JDesktopPane. Line 31 adds the JDesktopPaneto the application window s content pane. Lines 34 61 register an instance of an anonymous inner class that implements ActionListenerto handle the event when the user selects the newFramemenu item. When the event occurs, method actionPerformed (lines 40 57) creates a JInternalFrame object with lines 43 44. The JInternalFrame constructor used here requires five arguments a String for the title bar of the internal window, a boolean indicating whether the internal frame should be resizable by the user, a boolean indicating whether the internal frame should be closable by the user, a boolean indicating whether the internal frame should be maximizable by the user and a booleanindicating whether the internal frame should be minimizable by the user. For each of the boolean arguments, a truevalue indicates that the operation should be allowed. As with JFrames and JApplets, a JInternalFramehas a content pane to which GUI components can be attached. Line 47 gets a reference to the JInternalFrame s content pane. Line 48 creates an instance of our class MyJPanel(defined at lines 80 106) that is added to the JInternalFrame s content pane at line 49. Line 52 uses JInternalFrame method packto set the size of the child window. Method packuses the preferred sizes of the components on the content pane to determine the window s size. Class MyJPanel defines method getPreferredSize to specify the panel s preferred size. Line 55 adds the JInternalFrameto the JDesktopPane, and line 56 displays the JInternalFrame. Classes JInternalFrame and JDesktopPane provide many methods for managing child windows. See the on-line API documentation for a complete list of these methods. 13.12 Layout Managers In the preceding chapter, we introduced three layout managers FlowLayout, Border- Layoutand GridLayout. This section presents three additional layout managers (summarized in Figure 13.14). We discuss these layout managers in the sections that follow. Layout Manager Description BoxLayout A layout manager that allows GUI components to be arranged left-to-right or top-to-bottom in a container. Class Boxdefines a container with Box- Layoutas its default layout manager and provides static methods to create a Boxwith a horizontal or vertical BoxLayout. CardLayout A layout manager that stacks components like a deck of cards. If a component in the deck is a container, it can use any layout manager. Only the component at the top of the deck is visible. GridBagLayout A layout manager similar to GridLayout. Unlike GridLayout, each component size can vary and components can be added in any order. Fig. 13.14 Additional layout managers.
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