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.*;
import java.io.*;

public class SketchFrame extends JFrame
                         implements Constants
{
  // Constructor
  public SketchFrame(String title)
    {
      super(title);                                 // Call the base constructor
      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
      addMenuItem(fileMenu, 
                  newAction = new FileAction("New"),
                  KeyStroke.getKeyStroke('N',Event.CTRL_MASK ));
      addMenuItem(fileMenu, 
                  openAction = new FileAction("Open"),
                  KeyStroke.getKeyStroke('O',Event.CTRL_MASK ));
      addMenuItem(fileMenu, closeAction = new FileAction("Close"));
      fileMenu.addSeparator();                                    // Add separator

      addMenuItem(fileMenu, 
                  saveAction = new FileAction("Save"),
                  KeyStroke.getKeyStroke('S',Event.CTRL_MASK ));
      addMenuItem(fileMenu, 
                  saveAsAction = new FileAction("Save As..."));
      fileMenu.addSeparator();                                     // Add separator

      addMenuItem(fileMenu, 
                  printAction = new FileAction("Print"),
                  KeyStroke.getKeyStroke('P',Event.CTRL_MASK ));
     
      // Construct the Element pull down menu
      addMenuItem(elementMenu, lineAction = new TypeAction("Line", LINE));
      addMenuItem(elementMenu, 
                           rectangleAction = new TypeAction("Rectangle",RECTANGLE));
      addMenuItem(elementMenu, circleAction = new TypeAction("Circle", CIRCLE));
      addMenuItem(elementMenu, curveAction = new TypeAction("Curve", CURVE));

      elementMenu.addSeparator();

      JMenu colorMenu = new JMenu("Color");         // Color sub-menu
      elementMenu.add(colorMenu);                   // Add the sub-menu
      addMenuItem(colorMenu, redAction = new ColorAction("Red", Color.red));
      addMenuItem(colorMenu, 
                  yellowAction = new ColorAction("Yellow", Color.yellow));
      addMenuItem(colorMenu, 
                  greenAction = new ColorAction("Green", Color.green));
      addMenuItem(colorMenu, blueAction = new ColorAction("Blue", Color.blue));

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

      // Add file buttons
      toolBar.addSeparator();                                // Space at the start
      addToolBarButton(newAction);
      addToolBarButton(openAction);
      addToolBarButton(saveAction);
      addToolBarButton(printAction);
   
      // Add element type buttons
      toolBar.addSeparator();
      addToolBarButton(lineAction);
      addToolBarButton(rectangleAction);
      addToolBarButton(circleAction);
      addToolBarButton(curveAction);

      // Add element color buttons
      toolBar.addSeparator();
      addToolBarButton(redAction);
      addToolBarButton(yellowAction);
      addToolBarButton(greenAction);
      addToolBarButton(blueAction);
      toolBar.addSeparator();                                // Space at the end
 
      toolBar.setBorder(BorderFactory.createCompoundBorder(       // Toolbar border
                 BorderFactory.createLineBorder(Color.darkGray),
                 BorderFactory.createEmptyBorder(2,2,4,2)));   

      toolBar.setFloatable(false);                           // Inhibit toolbar floating
      getContentPane().add(toolBar, BorderLayout.NORTH);     // Add toolbar  
    }

  // We will add inner classes defining action objects here...
   
  //  FILE ACTION INNER CLASS
  class FileAction extends AbstractAction
    {    
      // Constructor
      FileAction(String name)
      {  
        super(name);  
        String iconFileName = "Images/"+ name + ".gif";
        if(new File(iconFileName).exists())
           putValue(SMALL_ICON, new ImageIcon(iconFileName));
      }

      public void actionPerformed(ActionEvent e)
      {
        // We will add action code here eventually...
      }
    }

  // TYPE ACTION INNER CLASS
  class TypeAction extends AbstractAction
    {    
      TypeAction(String name, int typeID)
      {
        super(name);
        this.typeID = typeID;
        String iconFileName = "Images/"+ name + ".gif";
        if(new File(iconFileName).exists())
          putValue(SMALL_ICON, new ImageIcon(iconFileName));

      }
    
      public void actionPerformed(ActionEvent e)
      {
        elementType = typeID;  
      }

      private int typeID;
    }

  // COLOR ACTION INNER CLASS
  class ColorAction extends AbstractAction
    {
       public ColorAction(String name, Color color)
       {
          super(name);
          this.color = color;
          String iconFileName = "Images/"+ name + ".gif";
          if(new File(iconFileName).exists())
             putValue(SMALL_ICON, new ImageIcon(iconFileName));

       }

       public void actionPerformed(ActionEvent e)
       {
          elementColor = color;

          // This is temporary - just to show it works
          getContentPane().setBackground(color);
       }

       private Color color;
    }

  //Helper for adding toolbar buttons 
  private JButton addToolBarButton(Action action)
    {
      JButton button = toolBar.add(action);                     // Add toolbar button
      button.setBorder(BorderFactory.createRaisedBevelBorder()); // Add button border
      button.setText(null);                                      // No button text
      return button;
    }


  private JMenuItem addMenuItem(JMenu menu, Action action)
    {
      JMenuItem item = menu.add(action);                  // Add the menu item
      item.setIcon(null);                                 // Remove the icon
      return item;                                        // Return the menu item
    }

  private JMenuItem addMenuItem(JMenu menu, Action action, KeyStroke keystroke)
    {
      JMenuItem item = addMenuItem(menu, action);         // Add the menu item
      item.setAccelerator(keystroke);                     // Set the accelerator
      return item;                                        // Return the menu item
    }

   
  // We will add action objects as members here...

  FileAction newAction,  openAction,   closeAction,
             saveAction, saveAsAction, printAction;
  // Element type actions
  private TypeAction lineAction, rectangleAction, 
                     circleAction, curveAction;
  // Element color actions
  private ColorAction redAction,   yellowAction,     
                      greenAction, blueAction ;

  private JMenuBar menuBar = new JMenuBar();               // Window menu bar
  private JToolBar toolBar = new JToolBar();		   // Toolbar 
  private Color elementColor = DEFAULT_ELEMENT_COLOR;      // Current element color
  private int elementType = DEFAULT_ELEMENT_TYPE;          // Current element type
}