sketchframe.java

非常好的java事例以及带源码事例的java2教程

  { 
    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
    }
    else if(e.getSource() == customColorItem)
    {
      Color color = JColorChooser.showDialog(this, "Select Custom Color",
                                                           elementColor);
      if(color != null)
      {
        elementColor = color;
        statusBar.setColorPane(color);
      }
    }
  }

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

  // Prompt for save operation when necessary
  public void checkForSave()
  {
    if(sketchChanged)
      if(JOptionPane.YES_OPTION ==
            JOptionPane.showConfirmDialog(SketchFrame.this,
                              "Current file has changed. Save current file?",
                               "Confirm Save Current File",
                               JOptionPane.YES_NO_OPTION,
                               JOptionPane.WARNING_MESSAGE))
        saveOperation();    
  }

  // Method for opening file
  public void openSketch(File inFile)
  {
    try
    {
      ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(
                                       new FileInputStream(inFile)));
      theApp.insertModel((SketchModel)in.readObject());
      in.close();
      modelFile = inFile;
      filename = modelFile.getName();            // Update the file name
      setTitle(frameTitle+modelFile.getPath());  // Change the window title
      sketchChanged = false;                     // Status is unchanged
    }
    catch(Exception e)
    {
      System.out.println(e);
      JOptionPane.showMessageDialog(SketchFrame.this,
                                          "Error reading a sketch file.",
                                              "File Input Error",
                                              JOptionPane.ERROR_MESSAGE);
    }
  }

  // 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

  private JMenuItem customColorItem;

  private String frameTitle;                         // Frame title
  private String filename = DEFAULT_FILENAME;        // Current model file name
  private File modelFile;                            // File for the current sketch
  private boolean sketchChanged = false;          // Model changed flag
  private JFileChooser files;                                // File dialogs

  Sketcher theApp;

  // 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)
    {
      String name = (String)getValue(NAME);
      if(name.equals(saveAction.getValue(NAME)))
      {
        saveOperation();
      }
      else if(name.equals(saveAsAction.getValue(NAME)))
      {
        File file = showDialog("Save Sketch As",
                               "Save",
                               "Save the sketch",
                               's',
                               modelFile == null ? new File(
                                 files.getCurrentDirectory(), filename):modelFile);
        if(file != null)
        {
           if(file.exists() && !file.equals(modelFile))
            if(JOptionPane.NO_OPTION ==                 // Overwrite warning
               JOptionPane.showConfirmDialog(SketchFrame.this,
                                  file.getName()+" exists. Overwrite?",
                                  "Confirm Save As",
                                  JOptionPane.YES_NO_OPTION,
                                  JOptionPane.WARNING_MESSAGE))
             return;                                    // No file selected 
          saveSketch(file);
        }
        return;
      }
      else if(name.equals(openAction.getValue(NAME)))
      {
        checkForSave();
        File file = showDialog("Open Sketch File",        // Dialog window title
                               "Open",                    // button lable
                               "Read a sketch from file", // Button tooltip text
                               'o',                       // Shortcut character
                               null);                     // No file selected
        if(file != null)                                  // If a file was selected
          openSketch(file);                               // then read it

      }
      else if(name.equals(newAction.getValue(NAME)))
      {
        checkForSave();
        theApp.insertModel(new SketchModel());         // Insert new empty sketch
        modelFile = null;                              // No file for it
        filename = DEFAULT_FILENAME;                   // Default name
        setTitle(frameTitle + files.getCurrentDirectory() + "\\" + filename);
        sketchChanged = false;                         // Not changed yet
      }
      else if(name.equals(closeAction.getValue(NAME)))
      {
        checkForSave();
        System.exit(0);
      }
      else if(name.equals(printAction.getValue(NAME)))
      {
        PrinterJob printJob = PrinterJob.getPrinterJob(); // Get a printing object
        printJob.setPrintable(theApp.getView());     // The view is the page source

        if(printJob.printDialog())                        // Display print dialog
        {                                                 // If true is returned...
          try
          {
            printJob.print();                             // then print
          }
          catch(PrinterException pe)
          {
            System.out.println(pe);
            JOptionPane.showMessageDialog(SketchFrame.this,
                                          "Error printing a sketch.",
                                              "Printer Error",
                                              JOptionPane.ERROR_MESSAGE);
          }
        }
      }
    }
  }

  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;
  }
}