sketchframe.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

// Frame for the Sketcher application
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SketchFrame extends JFrame
{

  // Constructor
  public SketchFrame(String title)
  {
    setTitle(title);                              // Set the window title
    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

    setJMenuBar(menuBar);                         // Add the menu bar to the window

    JMenu fileMenu = new JMenu("File");           // Create File menu
    JMenu elementMenu = new JMenu("Elements");    // Create Elements menu
    fileMenu.setMnemonic('F');                    // Create shortcut
    elementMenu.setMnemonic('E');                 // Create shortcut

    // Construct the file pull down menu
    newItem = fileMenu.add("New");                // Add New item
    openItem = fileMenu.add("Open");              // Add Open item
    closeItem = fileMenu.add("Close");            // Add Close item
    fileMenu.addSeparator();                      // Add separator
    saveItem = fileMenu.add("Save");              // Add Save item
    saveAsItem = fileMenu.add("Save As...");      // Add Save As item
    fileMenu.addSeparator();                      // Add separator
    printItem = fileMenu.add("Print");            // Add Print item

    // Add File menu accelerators
    newItem.setAccelerator(KeyStroke.getKeyStroke('N',Event.CTRL_MASK ));
    openItem.setAccelerator(KeyStroke.getKeyStroke('O',Event.CTRL_MASK ));
    saveItem.setAccelerator(KeyStroke.getKeyStroke('S',Event.CTRL_MASK ));
    printItem.setAccelerator(KeyStroke.getKeyStroke('P',Event.CTRL_MASK ));

    // Construct the Element pull down menu
    elementMenu.add(lineItem = new JRadioButtonMenuItem("Line", true));
    elementMenu.add(rectangleItem = new JRadioButtonMenuItem("Rectangle", false));
    elementMenu.add(circleItem = new JRadioButtonMenuItem("Circle", false));
    elementMenu.add(curveItem = new JRadioButtonMenuItem("Curve", false));
    ButtonGroup types = new ButtonGroup();
    types.add(lineItem);
    types.add(rectangleItem);
    types.add(circleItem);
    types.add(curveItem);

    // Add element type accelerators
    lineItem.setAccelerator(KeyStroke.getKeyStroke('L',Event.CTRL_MASK ));
    rectangleItem.setAccelerator(KeyStroke.getKeyStroke('E',Event.CTRL_MASK ));
    circleItem.setAccelerator(KeyStroke.getKeyStroke('I',Event.CTRL_MASK ));
    curveItem.setAccelerator(KeyStroke.getKeyStroke('V',Event.CTRL_MASK ));

    elementMenu.addSeparator();

    JMenu colorMenu = new JMenu("Color");         // Color sub-menu
    elementMenu.add(colorMenu);                   // Add the sub-menu
    colorMenu.add(redItem = new JCheckBoxMenuItem("Red", false));
    colorMenu.add(yellowItem = new JCheckBoxMenuItem("Yellow", false));
    colorMenu.add(greenItem = new JCheckBoxMenuItem("Green", false));
    colorMenu.add(blueItem = new JCheckBoxMenuItem("Blue", true));

    // Add element color accelerators
    redItem.setAccelerator(KeyStroke.getKeyStroke('R',Event.CTRL_MASK ));
    yellowItem.setAccelerator(KeyStroke.getKeyStroke('Y',Event.CTRL_MASK ));
    greenItem.setAccelerator(KeyStroke.getKeyStroke('G',Event.CTRL_MASK ));
    blueItem.setAccelerator(KeyStroke.getKeyStroke('B',Event.CTRL_MASK ));

    menuBar.add(fileMenu);                        // Add the file menu
    menuBar.add(elementMenu);                     // Add the element menu
  }

  private JMenuBar menuBar = new JMenuBar();      // Window menu bar

  // File menu items
  private JMenuItem newItem,  openItem,   closeItem,
                    saveItem, saveAsItem, printItem;

  // Element menu items
  private JRadioButtonMenuItem lineItem,  rectangleItem, circleItem,  // Types
                               curveItem, textItem;
  private JCheckBoxMenuItem    redItem,   yellowItem,                 // Colors
                               greenItem, blueItem ;  
}