FileChooserViewer.java

package edu.cmu.minorthird.ui;

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.JTextField;

import edu.cmu.minorthird.util.gui.ComponentViewer;
import edu.cmu.minorthird.util.gui.Viewer;

/**
 * A panel with a text area and a browse button
 * @author ksteppe
 */
public class FileChooserViewer extends ComponentViewer implements
		ActionListener{
	
	static final long serialVersionUID=20080517L;

	private JFileChooser chooser=new JFileChooser();

	private JTextField textField=new JTextField(30);

	private File selectedFile=null;

	private boolean openFile=true;

	private JButton button=new JButton("Browse");

	private String defaultDir="."; //= System.getProperty("minorthird");

	public FileChooserViewer(Viewer superView){
		setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
		setSuperView(superView);
		setContent(selectedFile,true);
		button.addActionListener(this);
		componentFor(null);

	}

	public void setFileSelectionMode(int mode){
		chooser.setFileSelectionMode(mode);
	}

	public void setFile(File f){
		selectedFile=f;

		textField.setText(selectedFile.getAbsolutePath());
		//fire the action up the chain
		sendSignal(OBJECT_SELECTED,selectedFile);
		componentFor(null);
	}

	@Override
	public JComponent componentFor(Object o){
		removeAll();
		log.debug("build panel");
		//build up panel
		setLayout(new GridLayout(0,2));
		add(textField);
		textField.setEditable(false);
		add(button);
		this.setVisible(true);

		return this;
	}

	public void addActionListener(ActionListener l){
		button.addActionListener(l);
	}

	@Override
	public void actionPerformed(ActionEvent e){
		if(selectedFile!=null)
			chooser.setSelectedFile(selectedFile);
		else{
			chooser.setSelectedFile(new File(defaultDir));
		}
		int returnVal=
				openFile?chooser.showOpenDialog(null):chooser.showSaveDialog(null);
		if(returnVal==JFileChooser.APPROVE_OPTION)
			setFile(chooser.getSelectedFile());
	}

	// default: recieve anything that can be converted to a component
	@Override
	public boolean canReceive(Object obj){
		return false;
	}

	@Override
	public void receiveContent(Object content){
		return;
	}

	public String getDefaultDir(){
		return defaultDir;
	}

	public void setDefaultDir(String defaultDir){
		if(defaultDir!=null)
			this.defaultDir=defaultDir;
	}
}