Test

Aus ProgrammingWiki

Archivierte Version vom 2021-03-21T15:23:40+00:00. Aktuelle Version

x

(clear canvas1)
(home turtle1)

(define quad
  (lambda (turtle s)
    (begin  
      (penwidth turtle 10)
      (pencolor turtle 255 0 0)
      (forward turtle s)
      (right turtle 90)
      (forward turtle s)
      (right turtle 90)
      (forward turtle s)
      (right turtle 90)
      (forward turtle s)
      (right turtle 90))))
 
(quad turtle1 50)

JFrame browser( startingUrl ) {
    invoke( method, args ) {}

    windowClosing(WindowEvent we) {
        we.getWindow().setVisible(false);
    }

    setPage( url ) {
        try {
          pane.setPage( url );
        } catch(Exception e) {
          statusBar.setText("Error opening page: "+url);
        }
    }

    hyperlinkUpdate( HyperlinkEvent he ) {
        type = he.getEventType();
        if (type == HyperlinkEvent.EventType.ENTERED) {
            pane.setCursor(
                Cursor.getPredefinedCursor( Cursor.HAND_CURSOR) );
            statusBar.setText(he.getURL().toString());
        } else 
            if (type == HyperlinkEvent.EventType.EXITED) {
            pane.setCursor( Cursor.getDefaultCursor() );
            statusBar.setText(" ");
        } else {
            setPage( he.getURL() );
            if (urlField != null)
                urlField.setText(he.getURL().toString());
        }
    }

    frame = new JFrame("Browser");
    frame.setSize(400,300);
    frame.addWindowListener( this );

    urlPanel = new JPanel();
    urlPanel.setLayout(new BorderLayout());
    urlField = new JTextField(startingUrl);
    urlPanel.add(new JLabel("Site: "), BorderLayout.WEST);
    urlPanel.add(urlField, BorderLayout.CENTER);

    statusBar = new JLabel(" ");
    pane = new JEditorPane();
    pane.setEditable(false);
    setPage( startingUrl );
    jsp = new JScrollPane(pane); 

    frame.getContentPane().add(jsp, BorderLayout.CENTER);
    frame.getContentPane().add(urlPanel, BorderLayout.SOUTH);
    frame.getContentPane().add(statusBar, BorderLayout.NORTH);

    // This is the equivalent of an inner class in bsh.
    urlTextHandler() {
        actionPerformed(ActionEvent ae) {
            setPage( ae.getActionCommand() );
        }
        return this;
    }

    urlField.addActionListener( urlTextHandler() );
    pane.addHyperlinkListener( (HyperlinkListener)this );
    frame.show();    
    return frame;
}

browser = browser("http://www.michael-hielscher.de/wiki");

Test

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