defaulteditorkit.java

gcc的组建

   * @see #getActions()
   */
  public static final String nextWordAction = "caret-next-word";

  /**
   * The name of the <code>Action</code> that moves the caret one page down.
   *
   * @see #getActions()
   */
  public static final String pageDownAction = "page-down";

  /**
   * The name of the <code>Action</code> that moves the caret one page up.
   *
   * @see #getActions()
   */
  public static final String pageUpAction = "page-up";

  /**
   * The name of the <code>Action</code> that copies content from the system
   * clipboard into the document.
   *
   * @see #getActions()
   */
  public static final String pasteAction = "paste-from-clipboard";

  /**
   * The name of the <code>Action</code> that moves the caret to the beginning
   * of the previous word.
   *
   * @see #getActions()
   */
  public static final String previousWordAction = "caret-previous-word";

  /**
   * The name of the <code>Action</code> that sets the editor in read only
   * mode.
   *
   * @see #getActions()
   */
  public static final String readOnlyAction = "set-read-only";

  /**
   * The name of the <code>Action</code> that selects the whole document.
   *
   * @see #getActions()
   */
  public static final String selectAllAction = "select-all";

  /**
   * The name of the <code>Action</code> that moves the caret one character
   * backwards, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionBackwardAction = "selection-backward";

  /**
   * The name of the <code>Action</code> that moves the caret to the beginning
   * of the document, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionBeginAction = "selection-begin";

  /**
   * The name of the <code>Action</code> that moves the caret to the beginning
   * of the current line, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionBeginLineAction = "selection-begin-line";

  /**
   * The name of the <code>Action</code> that moves the caret to the beginning
   * of the current paragraph, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionBeginParagraphAction =
    "selection-begin-paragraph";

  /**
   * The name of the <code>Action</code> that moves the caret to the beginning
   * of the current word, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionBeginWordAction = "selection-begin-word";

  /**
   * The name of the <code>Action</code> that moves the caret one line down,
   * possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionDownAction = "selection-down";

  /**
   * The name of the <code>Action</code> that moves the caret to the end
   * of the document, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionEndAction = "selection-end";

  /**
   * The name of the <code>Action</code> that moves the caret to the end
   * of the current line, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionEndLineAction = "selection-end-line";

  /**
   * The name of the <code>Action</code> that moves the caret to the end
   * of the current paragraph, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionEndParagraphAction =
    "selection-end-paragraph";

  /**
   * The name of the <code>Action</code> that moves the caret to the end
   * of the current word, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionEndWordAction = "selection-end-word";

  /**
   * The name of the <code>Action</code> that moves the caret one character
   * forwards, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionForwardAction = "selection-forward";

  /**
   * The name of the <code>Action</code> that moves the caret to the beginning
   * of the next word, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionNextWordAction = "selection-next-word";

  /**
   * The name of the <code>Action</code> that moves the caret to the beginning
   * of the previous word, possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionPreviousWordAction =
    "selection-previous-word";

  /**
   * The name of the <code>Action</code> that moves the caret one line up,
   * possibly extending the current selection.
   *
   * @see #getActions()
   */
  public static final String selectionUpAction = "selection-up";

  /**
   * The name of the <code>Action</code> that selects the line around the
   * caret.
   *
   * @see #getActions()
   */
  public static final String selectLineAction = "select-line";

  /**
   * The name of the <code>Action</code> that selects the paragraph around the
   * caret.
   *
   * @see #getActions()
   */
  public static final String selectParagraphAction = "select-paragraph";

  /**
   * The name of the <code>Action</code> that selects the word around the
   * caret.
   *
   * @see #getActions()
   */
  public static final String selectWordAction = "select-word";

  /**
   * The name of the <code>Action</code> that moves the caret one line up.
   *
   * @see #getActions()
   */
  public static final String upAction = "caret-up";

  /**
   * The name of the <code>Action</code> that sets the editor in read-write
   * mode.
   *
   * @see #getActions()
   */
  public static final String writableAction = "set-writable";

  /**
   * Creates a new <code>DefaultEditorKit</code>.
   */
  public DefaultEditorKit()
  {
    // Nothing to do here.
  }

  /**
   * The <code>Action</code>s that are supported by the
   * <code>DefaultEditorKit</code>.
   */
  // TODO: All these inner classes look ugly. Maybe work out a better way
  // to handle this.
  private static Action[] defaultActions = 
  new Action[] {
    new BeepAction(),
    new CopyAction(),
    new CutAction(),
    new DefaultKeyTypedAction(),
    new InsertBreakAction(),
    new InsertContentAction(),
    new InsertTabAction(),
    new PasteAction(),
    new TextAction(deleteNextCharAction) 
    { 
      public void actionPerformed(ActionEvent event)
      {
        JTextComponent t = getTextComponent(event);
        if (t != null)
          {
            try
              {
                int pos = t.getCaret().getDot();
                if (pos < t.getDocument().getEndPosition().getOffset())
                  {
                    t.getDocument().remove(t.getCaret().getDot(), 1);
                  }
              }
            catch (BadLocationException e)
              {
                // FIXME: we're not authorized to throw this.. swallow it?
              }
          }
      }
    },
    new TextAction(deletePrevCharAction) 
    { 
      public void actionPerformed(ActionEvent event)
      {
        JTextComponent t = getTextComponent(event);
        if (t != null)
          {
            try
              {
                int pos = t.getCaret().getDot();
                if (pos > t.getDocument().getStartPosition().getOffset())
                  {
                    t.getDocument().remove(pos - 1, 1);
                    t.getCaret().setDot(pos - 1);
                  }
              }
            catch (BadLocationException e)
              {
                // FIXME: we're not authorized to throw this.. swallow it?
              }
          }
      }
    },
    new TextAction(backwardAction) 
    { 
      public void actionPerformed(ActionEvent event)
      {
        JTextComponent t = getTextComponent(event);
        if (t != null)
          {
            t.getCaret().setDot(Math.max(t.getCaret().getDot() - 1,
                                         t.getDocument().getStartPosition().getOffset()));
          }
      }
    },
    new TextAction(forwardAction) 
    { 
      public void actionPerformed(ActionEvent event)
      {
        JTextComponent t = getTextComponent(event);
        if (t != null)
          {
            t.getCaret().setDot(Math.min(t.getCaret().getDot() + 1,
                                         t.getDocument().getEndPosition().getOffset()));
          }
      }
    },
    new TextAction(selectionBackwardAction)
    {
      public void actionPerformed(ActionEvent event)
      {
	JTextComponent t = getTextComponent(event);
	if (t != null)
	  {
	    t.getCaret().moveDot(Math.max(t.getCaret().getDot() - 1,
					  t.getDocument().getStartPosition().getOffset()));
	  }
      }
    },
    new TextAction(selectionForwardAction)
    {
      public void actionPerformed(ActionEvent event)
      {
        JTextComponent t = getTextComponent(event);
        if (t != null)
          {
            t.getCaret().moveDot(Math.min(t.getCaret().getDot() + 1,
                                          t.getDocument().getEndPosition().getOffset()));
          }
      }
    },
  };

  /**
   * Creates the <code>Caret</code> for this <code>EditorKit</code>. This
   * returns a {@link DefaultCaret} in this case.
   *
   * @return the <code>Caret</code> for this <code>EditorKit</code>
   */
  public Caret createCaret()
  {
    return new DefaultCaret();
  }

  /**
   * Creates the default {@link Document} that this <code>EditorKit</code>
   * supports. This is a {@link PlainDocument} in this case.
   *
   * @return the default {@link Document} that this <code>EditorKit</code>
   *         supports
   */
  public Document createDefaultDocument()
  {
    return new PlainDocument();
  }

  /**
   * Returns the <code>Action</code>s supported by this <code>EditorKit</code>.
   *
   * @return the <code>Action</code>s supported by this <code>EditorKit</code>
   */
  public Action[] getActions()
  {
    return defaultActions;
  }

  /**
   * Returns the content type that this <code>EditorKit</code> supports.
   * The <code>DefaultEditorKit</code> supports the content type
   * <code>text/plain</code>.
   *
   * @return the content type that this <code>EditorKit</code> supports
   */
  public String getContentType()
  {
    return "text/plain";
  }

  /**
   * Returns a {@link ViewFactory} that is able to create {@link View}s for
   * the <code>Element</code>s that are used in this <code>EditorKit</code>'s
   * model. This returns null which lets the UI of the text component supply
   * <code>View</code>s.
   *
   * @return a {@link ViewFactory} that is able to create {@link View}s for
   *         the <code>Element</code>s that are used in this
   *         <code>EditorKit</code>'s model
   */
  public ViewFactory getViewFactory()
  {
    return null;
  }

  /**
   * Reads a document of the supported content type from an {@link InputStream}
   * into the actual {@link Document} object.
   *
   * @param in the stream from which to read the document
   * @param document the document model into which the content is read
   * @param offset the offset inside to document where the content is inserted
   *
   * @throws BadLocationException if <code>offset</code> is an invalid location
   *         inside <code>document</code>
   * @throws IOException if something goes wrong while reading from
   *        <code>in</code>
   */
  public void read(InputStream in, Document document, int offset)
    throws BadLocationException, IOException
  {
    read(new InputStreamReader(in), document, offset);
  }

  /**
   * Reads a document of the supported content type from a {@link Reader}
   * into the actual {@link Document} object.
   *
   * @param in the reader from which to read the document
   * @param document the document model into which the content is read
   * @param offset the offset inside to document where the content is inserted
   *
   * @throws BadLocationException if <code>offset</code> is an invalid location
   *         inside <code>document</code>
   * @throws IOException if something goes wrong while reading from
   *        <code>in</code>
   */
  public void read(Reader in, Document document, int offset)
    throws BadLocationException, IOException
  {
    BufferedReader reader = new BufferedReader(in);

    String line;
    StringBuffer content = new StringBuffer();

    while ((line = reader.readLine()) != null)
      {
	content.append(line);
	content.append("\n");
      }
    
    document.insertString(offset, content.toString(),
			  SimpleAttributeSet.EMPTY);
  }

  /**
   * Writes the <code>Document</code> (or a fragment of the
   * <code>Document</code>) to an {@link OutputStream} in the
   * supported content type format.
   *
   * @param out the stream to write to
   * @param document the document that should be written out
   * @param offset the beginning offset from where to write
   * @param len the length of the fragment to write
   *
   * @throws BadLocationException if <code>offset</code> or
   *         <code>offset + len</code>is an invalid location inside
   *         <code>document</code>
   * @throws IOException if something goes wrong while writing to
   *        <code>out</code>
   */
  public void write(OutputStream out, Document document, int offset, int len)
    throws BadLocationException, IOException
  {
    write(new OutputStreamWriter(out), document, offset, len);
  }

  /**
   * Writes the <code>Document</code> (or a fragment of the
   * <code>Document</code>) to a {@link Writer} in the
   * supported content type format.
   *
   * @param out the writer to write to
   * @param document the document that should be written out
   * @param offset the beginning offset from where to write
   * @param len the length of the fragment to write
   *
   * @throws BadLocationException if <code>offset</code> is an 
   * invalid location inside <code>document</code>.
   * @throws IOException if something goes wrong while writing to
   *        <code>out</code>
   */
  public void write(Writer out, Document document, int offset, int len)
      throws BadLocationException, IOException
  {
    // Throw a BLE if offset is invalid
    if (offset < 0 || offset > document.getLength())
      throw new BadLocationException("Tried to write to invalid location",
                                     offset);

    // If they gave an overly large len, just adjust it
    if (offset + len > document.getLength())
      len = document.getLength() - offset;

    out.write(document.getText(offset, len));
  }
}