htmleditor.java

java swing 开发代码

// HTMLEditor.java
// An extension of StyledEditor that adds HTML-related features.
//
package	jswing.ch23;

import javax.swing.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import java.awt.event.*;
import java.awt.*;

public class HTMLEditor extends StyledEditor {

  private final static String COPY_HTML =
    "<p>&copy; 2003, O'Reilly &amp; Associates</p>";

  public static void main(String[] args) {
    HTMLEditor editor = new HTMLEditor();
    editor.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    editor.setVisible(true);
  }

  // Override to create a JEditorPane with the HTMLEditorKit in place
  protected JTextComponent createTextComponent() {
    JEditorPane jep = new JEditorPane();
    jep.setEditorKit(new HTMLEditorKit());
    return jep;
  }

  // Add icons & friendly names for font actions
  protected void makeActionsPretty() {
    super.makeActionsPretty();

    Action a;
    // HTML Actions
    a = getTextComponent().getActionMap().get("InsertHR");
    a.putValue(Action.SMALL_ICON, new ImageIcon("icons/hr.gif"));
    a.putValue(Action.NAME, "HR");

    // Custom HTML Actions, need to store these in the map...
    // First, an easy use of the InsertHTMLTextAction class
    a = new HTMLEditorKit.InsertHTMLTextAction("InsertCopyright", COPY_HTML,
					       HTML.Tag.BODY, HTML.Tag.P);
    a.putValue(Action.SMALL_ICON, new ImageIcon("icons/copyright.gif"));
    a.putValue(Action.NAME, "Teletype Text");
    getTextComponent().getActionMap().put("add-copyright", a);

    // And some of our own Tags that require a little more work.
    // See the TagAction inner class below.
    a = new TagAction(HTML.Tag.A, "URL", HTML.Attribute.HREF);
    a.putValue(Action.SMALL_ICON, new ImageIcon("icons/link.gif"));
    a.putValue(Action.NAME, "Anchor Link");
    getTextComponent().getActionMap().put("anchor-link", a);

    a = new TagAction(HTML.Tag.A, "Name", HTML.Attribute.NAME);
    a.putValue(Action.SMALL_ICON, new ImageIcon("icons/anchor.gif"));
    a.putValue(Action.NAME, "Anchor Name");
    getTextComponent().getActionMap().put("anchor-name", a);

    a = new ImageAction();
    a.putValue(Action.SMALL_ICON, new ImageIcon("icons/picture.gif"));
    a.putValue(Action.NAME, "Image");
    getTextComponent().getActionMap().put("InsertIMG", a);
  }

  // Add HTML actions to the toolbar
  protected JToolBar createToolBar() {
    JToolBar bar = super.createToolBar();
    bar.addSeparator();

    bar.add(getTextComponent().getActionMap().get("add-copyright")).setText("");
    bar.add(getTextComponent().getActionMap().get("InsertHR")).setText("");
    bar.add(getTextComponent().getActionMap().get("InsertIMG")).setText("");
    bar.add(getTextComponent().getActionMap().get("anchor-link")).setText("");
    bar.add(getTextComponent().getActionMap().get("anchor-name")).setText("");
    return bar;
  }

  // Add a preview action to the menu
  protected JMenuBar createMenuBar() {
    JMenuBar menubar = super.createMenuBar();

    JMenu view = new JMenu("View");
    JMenuItem preview = new JMenuItem("Preview");
    view.add(preview);
    preview.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
	JEditorPane editor = (JEditorPane)getTextComponent();
	JEditorPane display = new JEditorPane();
	display.setEditable(false);
        display.setEditorKit(new HTMLEditorKit());
        JScrollPane sp = new JScrollPane(display);
        sp.setPreferredSize(new Dimension(500,500));
	try {
	  //display.setPage(currentFile.toURL());
          display.setDocument(editor.getDocument());
	}
	catch (Exception e) {
	  display.setText("Failed to preview file.\n" +
			  "Make sure file has been saved.");
	}
	JOptionPane.showMessageDialog(null, sp, "Preview",
				      JOptionPane.PLAIN_MESSAGE);
      }
    });
    menubar.add(view);

    return menubar;
  }

  public class TagAction extends StyledEditorKit.StyledTextAction {
    private HTML.Tag tag;
    private HTML.Attribute tagAttr;
    private String tagName;

    public TagAction(HTML.Tag t, String s, HTML.Attribute a) {
      super(s);
      tag = t;
      tagName = s;
      tagAttr = a;
    }

    public void actionPerformed(ActionEvent e) {
      JEditorPane editor = getEditor(e);
      if (editor != null) {
	String value = JOptionPane.showInputDialog(HTMLEditor.this, 
						   "Enter " + tagName +":");
	StyledEditorKit kit = getStyledEditorKit(editor);
	MutableAttributeSet attr = kit.getInputAttributes();
	boolean anchor = attr.isDefined(tag);
	if (anchor) {
	  attr.removeAttribute(tag);
	}
	else {
	  SimpleAttributeSet as = new SimpleAttributeSet();
	  as.addAttribute(tagAttr, value);
	  attr.addAttribute(tag, as);
	}
	setCharacterAttributes(editor, attr, false);
      }
    }
  }

  public class ImageAction extends StyledEditorKit.StyledTextAction {
    public ImageAction() {
      super("InsertIMG");
    }

    public void actionPerformed(ActionEvent ae) {
      JEditorPane editor = getEditor(ae);
      if (editor == null) {
        // no editor in focus...just ignore this for now
        return;
      }

      HTMLEditorKit kit = (HTMLEditorKit)editor.getEditorKit();
      HTMLDocument doc = (HTMLDocument)editor.getDocument();
      String value = JOptionPane.showInputDialog(HTMLEditor.this, 
						"Image file:");
      try {
	kit.insertHTML(doc, editor.getCaretPosition(),
		       "<img src=\"" + value + "\">", 0, 0,
		       HTML.Tag.IMG);
      }
      catch (Exception e) {
        JOptionPane.showMessageDialog(HTMLEditor.this,
        "Image Not Loaded", "ERROR", JOptionPane.ERROR_MESSAGE);
	e.printStackTrace();
      }
    }
  }
}