sketchframe.java

java入门编程资料汇编

// 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, ActionListener
{
  // Constructor
  public SketchFrame(String title, Sketcher theApp)
  {
    setTitle(title);                              // Set the window title
    this.theApp = theApp;
    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
    JMenu optionsMenu = new JMenu("Options");     // Create options menu
    JMenu helpMenu = new JMenu("Help");           // Create Help menu

    fileMenu.setMnemonic('F');                    // Create shortcut
    elementMenu.setMnemonic('E');                 // Create shortcut
    optionsMenu.setMnemonic('O');                 // Create shortcut
    helpMenu.setMnemonic('H');                    // Create shortcut 

    // Construct the file pull down menu
    addMenuItem(fileMenu, 
                newAction = new FileAction("New", "Create new sketch"),
                KeyStroke.getKeyStroke('N',Event.CTRL_MASK ));
    addMenuItem(fileMenu, 
                openAction = new FileAction("Open", "Open existing sketch"), 
                KeyStroke.getKeyStroke('O',Event.CTRL_MASK ));
    addMenuItem(fileMenu, 
                closeAction = new FileAction("Close", "Close sketch"), null);
    fileMenu.addSeparator();                                       // Add separator
    addMenuItem(fileMenu, 
                saveAction = new FileAction("Save", "Save sketch"),
                KeyStroke.getKeyStroke('S',Event.CTRL_MASK ));
    addMenuItem(fileMenu, 
                saveAsAction = new FileAction("Save As...","Save as new file"),
                null);
    fileMenu.addSeparator();                                       // Add separator
    addMenuItem(fileMenu, 
                printAction = new FileAction("Print", "Print sketch"),
                KeyStroke.getKeyStroke('P',Event.CTRL_MASK ));
     
    // Construct the Element pull down menu
    addMenuItem(elementMenu, 
                lineAction = new TypeAction("Line", LINE, "Draw lines"));
    addMenuItem(elementMenu, 
                rectangleAction = new TypeAction("Rectangle", RECTANGLE, 
                                                 "Draw rectangles"));
    addMenuItem(elementMenu, 
                circleAction = new TypeAction("Circle", CIRCLE, "Draw circles"));
    addMenuItem(elementMenu, 
                curveAction = new TypeAction("Curve", CURVE, "Draw curves"));
    addMenuItem(elementMenu, textAction = new TypeAction("Text", TEXT,
                                                         "Draw text"), null);

    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, "Draw in red"));
    addMenuItem(colorMenu, 
                yellowAction = new ColorAction("Yellow", Color.yellow,
                                                               "Draw in yellow"));
    addMenuItem(colorMenu, 
                greenAction = new ColorAction("Green", Color.green, 
                                                                "Draw in green"));
    addMenuItem(colorMenu, 
                blueAction = new ColorAction("Blue", Color.blue, "Draw in blue"));

    // Add the font choice item to the options menu
    fontItem = new JMenuItem("Choose font...");
    fontItem.addActionListener(this);
    optionsMenu.add(fontItem);

    // Add the About item to the Help menu
    aboutItem = new JMenuItem("About");           // Create the item
    aboutItem.addActionListener(this);            // Listener is the frame
    helpMenu.add(aboutItem);                      // Add item to menu

    menuBar.add(fileMenu);                        // Add the file menu
    menuBar.add(elementMenu);                     // Add the element menu
    menuBar.add(optionsMenu);                     // Add the options menu
    menuBar.add(helpMenu);                        // Add the Help 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);
    addToolBarButton(textAction);

    // Add element color buttons
    toolBar.addSeparator();
    addToolBarButton(redAction);
    addToolBarButton(yellowAction);
    addToolBarButton(greenAction);
    addToolBarButton(blueAction);
    toolBar.addSeparator();                            // Space at the end

    // Create pop-up menu
    popup.add(lineAction);
    popup.add(rectangleAction);
    popup.add(circleAction);
    popup.add(curveAction);
    popup.add(textAction);

    popup.addSeparator();
    popup.add(redAction);
    popup.add(yellowAction);
    popup.add(greenAction);
    popup.add(blueAction);

    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 the toolbar

    // Disable actions
    saveAction.setEnabled(false);
    closeAction.setEnabled(false);
    printAction.setEnabled(false);
    getContentPane().add(statusBar, BorderLayout.SOUTH);         // Add the statusbar
    fontDlg = new FontDialog(this);
  }

  private JButton addToolBarButton(Action action)
  {
    JButton button = toolBar.add(action);                     // Add toolbar button
    button.setToolTipText((String)action.getValue(action.SHORT_DESCRIPTION));
    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 inner classes defining action objects here...
  class FileAction extends AbstractAction
  {    
    FileAction(String name)
    {
      super(name);
      String iconFileName = "Images/" + name + ".gif";
      if(new File(iconFileName).exists())
        putValue(SMALL_ICON, new ImageIcon(iconFileName));
    }

    FileAction(String name, String tooltip)
    {
      this(name);                                     // Call the other constructor
      if(tooltip != null)                             // If there is tooltip text
        putValue(SHORT_DESCRIPTION, tooltip);         // ...squirrel it away
    }

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

  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));
    }

    TypeAction(String name, int typeID, String tooltip)
    {
      this(name, typeID);
      if(tooltip != null)                               // If there is a tooltip
        putValue(SHORT_DESCRIPTION, tooltip);           // ...squirrel it away
    }
    
    public void actionPerformed(ActionEvent e)
    {
      elementType = typeID;
      statusBar.setTypePane(typeID);
    }

    private int typeID;
  }

  // Handles color menu items
  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 ColorAction(String name, Color color, String tooltip)
    {
      this(name, color);
      if(tooltip != null)                               // If there is a tooltip
        putValue(SHORT_DESCRIPTION, tooltip);           // ...squirrel it away
    }

    public void actionPerformed(ActionEvent e)
    {
      elementColor = color;
      statusBar.setColorPane(color);
    }

    private Color color;
  }

  public Color getElementColor()
  { 
    return elementColor; 
  }

  public int getElementType()
  { 
    return elementType; 
  }

  public Font getCurrentFont()
  {
    return font;
  }

  // Retrieve the pop-up menu
  public JPopupMenu getPopup()
  {
    return popup;
  }

  public void actionPerformed(ActionEvent e)
  {
    if(e.getSource() == aboutItem)
    {
      // Create about dialog with the menu item as parent
      JOptionPane.showMessageDialog((Component)e.getSource(),       // Parent
                             "Sketcher Copyright Ivor Horton 1999", // Message
                             "About Sketcher",                      // Title
                                 JOptionPane.INFORMATION_MESSAGE);  // Message type
    }
    else if(e.getSource() == fontItem)
    { // Set the dialog window position
      Rectangle bounds = getBounds();
      fontDlg.setLocation(bounds.x + bounds.width/3, bounds.y + bounds.height/3);

      fontDlg.setVisible(true);            // Show the dialog
    }
  }

  public void setCurrentFont(Font font)
  {
    this.font = font;
  }

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

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

  private Color elementColor = DEFAULT_ELEMENT_COLOR;      // Current element color
  private int elementType = DEFAULT_ELEMENT_TYPE;          // Current element type
  private Font font = DEFAULT_FONT;                        // Current font

  private JToolBar toolBar = new JToolBar();                  // Window toolbar
  StatusBar statusBar = new StatusBar();                      // Window status bar
  private JPopupMenu popup = new JPopupMenu("General");       // Window pop-up

  // Sundry menu items
  private JMenuItem aboutItem, fontItem;
  private FontDialog fontDlg;                     // The font dialog

  Sketcher theApp;
}