FileDocCategorySizeDatePackage
ScribbleFrame.javaAPI DocExample18409Mon May 19 18:23:14 BST 1997None

ScribbleFrame

public class ScribbleFrame extends Frame
This class places a Scribble component in a ScrollPane container, puts the ScrollPane in a window, and adds a simple pulldown menu system. The menu uses menu shortcuts. Events are handled with anonymous classes.

Fields Summary
protected static int
num_windows
Remember # of open windows so we can quit when last one is closed
Constructors Summary
public ScribbleFrame()
Create a Frame, Menu, and ScrollPane for the scribble component


             
    
    super("ScribbleFrame");                  // Create the window.
    num_windows++;                           // Count it.

    ScrollPane pane = new ScrollPane();      // Create a ScrollPane.
    pane.setSize(300, 300);                  // Specify its size.
    this.add(pane, "Center");                // Add it to the frame.
    Scribble scribble;
    scribble = new Scribble(this, 500, 500); // Create a bigger scribble area.
    pane.add(scribble);                      // Add it to the ScrollPane.

    MenuBar menubar = new MenuBar();         // Create a menubar.
    this.setMenuBar(menubar);                // Add it to the frame.
    Menu file = new Menu("File");            // Create a File menu.
    menubar.add(file);                       // Add to menubar.

    // Create three menu items, with menu shortcuts, and add to the menu.
    MenuItem n, c, q;
    file.add(n = new MenuItem("New Window", new MenuShortcut(KeyEvent.VK_N)));
    file.add(c = new MenuItem("Close Window",new MenuShortcut(KeyEvent.VK_W)));
    file.addSeparator();                     // Put a separator in the menu
    file.add(q = new MenuItem("Quit", new MenuShortcut(KeyEvent.VK_Q)));

    // Create and register action listener objects for the three menu items.
    n.addActionListener(new ActionListener() {     // Open a new window
      public void actionPerformed(ActionEvent e) { new ScribbleFrame(); }
    });
    c.addActionListener(new ActionListener() {     // Close this window.
      public void actionPerformed(ActionEvent e) { close(); }
    });
    q.addActionListener(new ActionListener() {     // Quit the program.
      public void actionPerformed(ActionEvent e) { System.exit(0); }
    });

    // Another event listener, this one to handle window close requests.
    this.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) { close(); }
    });

    // Set the window size and pop it up.
    this.pack();
    this.show();
Methods Summary
voidclose()
Close a window. If this is the last open window, just quit.

    if (--num_windows == 0) System.exit(0);
    else this.dispose();
public static voidmain(java.lang.String[] args)
A very simple main() method for our program.

 new ScribbleFrame();