TextObserver.java from GridBlocks at Krugle

Show TextObserver.java syntax highlighted

package fi.hip.gb.client.ui;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.StringReader;
import java.rmi.RemoteException;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.text.EditorKit;
import javax.swing.text.StyledEditorKit;

import fi.hip.gb.core.WorkResult;
import fi.hip.gb.utils.Base64;


/**
 * Builds user interface for showing plain text and html results to the user.
 * 
 * @author Juho Karppinen
 */
public class TextObserver extends JComponent {

    /** textarea for text */
	private JTextPane text;

	/** result to be shown */
	private String data;
    
    private static final long serialVersionUID = 7349551307526265945L;
    
	public TextObserver(String data) {
        this.data = data;

        this.setLayout(new GridBagLayout());

        GridBagConstraints c = new GridBagConstraints();
        c.insets = new Insets(1, 2, 1, 2);
        c.gridx = 0; c.gridwidth = 1;

        c.gridy = 0; c.gridheight = 10;
        c.weightx = 1.0f; c.weighty = 1.0f; c.fill = GridBagConstraints.BOTH;
        c.anchor = GridBagConstraints.NORTH;
        
        this.text = new JTextPane();
        Utils.addPopupMenu(this.text);
        //setRaw();
        JScrollPane scrollPane = new JScrollPane(this.text);
        scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        this.add(scrollPane, c);
        
        c.gridy = 11; c.gridheight = 1;
        c.weightx = 0.0f; c.weighty = 0.0f; c.fill = GridBagConstraints.NONE;
        c.anchor = GridBagConstraints.SOUTH;
        this.add(getButtons(), c);

        setRaw();
	}

	/**
	 * Saves the content of text area.
	 * 
	 * @see fi.hip.gb.mobile.Observer#saveResult(WorkResult)
	 */
	public String saveResult(WorkResult result) throws RemoteException {
		return this.text.getText();
	}

	/**
	 * Sets output to raw text
	 */
	private void setRaw() {
		StringBuffer raw = new StringBuffer();
		raw.append(this.data);

		this.text.setText("");
		
		JTextPane jtp = new JTextPane();
		EditorKit editorKit = new StyledEditorKit();
		jtp.setEditorKit(editorKit);
		try {
			editorKit.read(new StringReader(raw.toString()), jtp.getStyledDocument(),0);
		} catch (Exception e) { System.out.println("Error reading file as plain text: " + e); }
		this.text.setFont(new JTextArea().getFont());
		this.text.replaceSelection(jtp.getText());
	}

	/**
	 * Sets output to html text
	 */
	private void setHtml() {
		StringBuffer html = new StringBuffer();
		html.append("<html>");
		html.append(this.data);
		html.append("</html>");
		this.text.setText("");
		this.text.setContentType("text/html");
		this.text.setText(html.toString());
	}

	private JComponent getButtons() {
		JComponent pane = new JPanel();
		pane.setLayout(new GridBagLayout());
		pane.setBorder(
			BorderFactory.createTitledBorder("Visualization options"));

		GridBagConstraints c = new GridBagConstraints();
		c.insets = new Insets(1, 2, 1, 2);
		c.gridy = 0; c.weightx = 1.0f; c.weighty = 1.0f;
		c.fill = GridBagConstraints.BOTH;
        c.anchor = GridBagConstraints.CENTER;

        JButton de64 = new JButton("Base64 Decode");
        de64.setMnemonic(KeyEvent.VK_F);
        de64.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                TextObserver.this.data = new String(Base64.decode(TextObserver.this.data.toCharArray()));
                if(TextObserver.this.text.getContentType().equals("text/html")) {
                    setHtml();
                } else {
                    setRaw();
                }
            }});
        c.gridx = 0;
        pane.add(de64, c);

		JRadioButton btnHtml = new JRadioButton("Show as HTML");
		btnHtml.setMnemonic(KeyEvent.VK_H);
		btnHtml.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent event) {
				setHtml();	
			}});
		c.gridx++;
		pane.add(btnHtml, c);
		
		JRadioButton btnRaw = new JRadioButton("Show as plain text");
		btnRaw.setMnemonic(KeyEvent.VK_P);
		btnRaw.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent event) {
				setRaw();	
			}});
		c.gridx++;
		pane.add(btnRaw, c);

		//Group the radio buttons.
		ButtonGroup group = new ButtonGroup();
		group.add(btnHtml);
		group.add(btnRaw);
		btnRaw.setSelected(true);

		return pane;
	}
}
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