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TextEditor.javaAPI DocGlassfish v2 API6104Fri Aug 17 15:55:08 BST 2007com.sun.activation.viewers

TextEditor

public class TextEditor extends Panel implements CommandObject, ActionListener

Fields Summary
private TextArea
text_area
private GridBagLayout
panel_gb
private Panel
button_panel
private Button
save_button
private File
text_file
private String
text_buffer
private InputStream
data_ins
private FileInputStream
fis
private DataHandler
_dh
private boolean
DEBUG
Constructors Summary
public TextEditor()
Constructor

	 	 
      
	panel_gb = new GridBagLayout();
	setLayout(panel_gb);
	
	button_panel = new Panel();
	//	button_panel.setBackground(Color.white);
	button_panel.setLayout( new FlowLayout() );
	save_button = new Button("SAVE");
	button_panel.add(save_button);
	addGridComponent(this,
			 button_panel,
			 panel_gb,
			 0,0,
			 1,1,
			 1,0);
	
	// create the text area
	text_area = new TextArea("This is text",24, 80, 
				 TextArea.SCROLLBARS_VERTICAL_ONLY );
	//	text_area.setBackground(Color.lightGray);
	text_area.setEditable( true );
	
	addGridComponent(this,
			 text_area,
			 panel_gb,
			 0,1,
			 1,2,
			 1,1);
	
	// add listeners
	save_button.addActionListener( this );
Methods Summary
public voidactionPerformed(java.awt.event.ActionEvent evt)

	if(evt.getSource() == save_button) { // save button pressed!
	    
	    // Save ourselves
	    this.performSaveOperation();
	}
private voidaddGridComponent(java.awt.Container cont, java.awt.Component comp, java.awt.GridBagLayout mygb, int gridx, int gridy, int gridw, int gridh, int weightx, int weighty)
adds a component to our gridbag layout

 
	GridBagConstraints c = new GridBagConstraints(); 
	c.gridx = gridx; 
	c.gridy = gridy; 
	c.gridwidth = gridw; 
	c.gridheight = gridh; 
	c.fill = GridBagConstraints.BOTH;
	c.weighty = weighty;
	c.weightx = weightx;
	c.anchor =  GridBagConstraints.CENTER;
	mygb.setConstraints(comp, c); 
	cont.add(comp);
public voidaddNotify()

	super.addNotify();
	invalidate();
public java.awt.DimensiongetPreferredSize()

	return text_area.getMinimumSize(24, 80);
private voidperformSaveOperation()

	OutputStream fos = null;
	try {
	    fos = _dh.getOutputStream();
	} catch (Exception e) {}
	
	String buffer = text_area.getText();
	
	// make sure we got one
	if(fos == null) {
	    System.out.println("Invalid outputstream in TextEditor!");
	    System.out.println("not saving!");
	    return;
	}
	
	try {
	    fos.write( buffer.getBytes() );
	    fos.flush(); // flush it!
	    fos.close(); // close it!
	} catch(IOException e)
	    {
		System.out.println("TextEditor Save Operation failed with: " + e);
	    }
public voidsetCommandContext(java.lang.String verb, javax.activation.DataHandler dh)

	_dh = dh;
	this.setInputStream( _dh.getInputStream() );
public voidsetInputStream(java.io.InputStream ins)
set the data stream, component to assume it is ready to be read.

	
	byte data[] = new byte[1024];
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	int bytes_read = 0;
	// check that we can actually read
	
	while((bytes_read = ins.read(data)) >0)
	    baos.write(data, 0, bytes_read);
	ins.close();

      
	// convert the buffer into a string
	// popuplate the buffer
	text_buffer = baos.toString();

	// place in the text area
	text_area.setText(text_buffer);