import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.swing.text.*;
//import javax.swing.table.*;

public class TCPopupEventQueue extends EventQueue {
	
	public JPopupMenu popup;
	public BasicAction cut, copy, paste, selectAll;
	
	public TCPopupEventQueue() {
		//createPopupMenu();
	}
	
	public void createPopupMenu(JTextComponent tc) {
		cut = new CutAction("Cut",null);
		copy = new CopyAction("Copy", null);
		paste = new PasteAction("Paste",null);
		selectAll = new SelectAllAction("Select All",null);
		
		cut.setTextComponent(tc);
		copy.setTextComponent(tc);
		paste.setTextComponent(tc);
		selectAll.setTextComponent(tc);
		
		popup = new JPopupMenu();
		popup.add( cut );
		popup.add( copy );
		popup.add( paste );
		popup.addSeparator();
		popup.add( selectAll );
	}
	
	public void showPopup(Component parent, MouseEvent me) {		
		popup.validate();
		popup.show(parent, me.getX(), me.getY());
	}
	
	protected void dispatchEvent(AWTEvent event) {
		super.dispatchEvent(event);
		
		if(!(event instanceof MouseEvent)) {
			return;
		}
		
		MouseEvent me = (MouseEvent)event;
		
		if(!me.isPopupTrigger()) {
			return;
		}
		
		if( !(me.getSource() instanceof Component) ) {
			return;
		}
		
		Component comp = SwingUtilities.getDeepestComponentAt((Component)me.getSource(),	
						me.getX(), me.getY());
		
		if( !(comp instanceof JTextComponent) ) {
			return;
		}
		
		if(MenuSelectionManager.defaultManager().getSelectedPath().length > 0) {
			return;
		}
		
		createPopupMenu((JTextComponent)comp);
		showPopup((Component)me.getSource(), me);
	}
	
	//=================== Inner Classes =====================
	public abstract class BasicAction extends AbstractAction {
		JTextComponent comp;
		
		public BasicAction(String text, Icon icon) {
			super(text, icon);
			putValue(Action.SHORT_DESCRIPTION, text);
		}
		
		public void setTextComponent(JTextComponent comp) {
			this.comp = comp;
		}
		
		public abstract void actionPerformed(ActionEvent e);
	}
	
	public class CutAction extends BasicAction {
		
		public CutAction(String text, Icon icon) {
			super(text, icon);
			putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("ctrl X"));
		}
		
		public void actionPerformed(ActionEvent e) {
			comp.cut();
		}
		
		public boolean isEnabled() {
			return comp != null && comp.isEditable() && comp.getSelectedText() != null;
		}
	}
	
	public class CopyAction extends BasicAction {
		
		public CopyAction(String text, Icon icon) {
			super(text,icon);
			putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("ctrl C"));
		}
		
		public void actionPerformed(ActionEvent e) {
			comp.copy();
		}
		
		public boolean isEnabled() {
			//System.out.println("Copy isEnabled() Called");
			return comp != null && comp.getSelectedText() != null;
		}
	}
	
	public class PasteAction extends BasicAction {
		
		public PasteAction(String text, Icon icon) {
			super(text,icon);
			putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("ctrl V"));
		}
		
		public void actionPerformed(ActionEvent e) {
			comp.paste();
		}
		
		public boolean isEnabled() {
			Transferable content = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null);
			return comp != null && comp.isEnabled() && comp.isEditable() 
						&& content.isDataFlavorSupported(DataFlavor.stringFlavor);
		}
	}
	
	public class SelectAllAction extends BasicAction {
		
		public SelectAllAction(String text, Icon icon) {
			super(text,icon);
			putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke("ctrl A"));
		}
		
		public void actionPerformed(ActionEvent e) {
			comp.selectAll();
		}
		
		public boolean isEnabled() {
			return comp != null && comp.isEnabled() && comp.getText().length() > 0 
					&& (comp.getSelectedText() == null || 
						comp.getSelectedText().length() < comp.getText().length());
		}
	}
	
	
	public static void main(String[] args) {
		Toolkit.getDefaultToolkit().getSystemEventQueue().push( new TCPopupEventQueue() );
		
		JTextField field = new JTextField(25);
		JTextArea area = new JTextArea(5,40);
		
		JPanel center = new JPanel( new FlowLayout(FlowLayout.LEFT) );
			center.add( new JLabel("Right Click In Field: ") );
			center.add( field );
			
		JPanel content = new JPanel( new BorderLayout() );
			content.add( new JScrollPane(area) );
			content.add( center, BorderLayout.SOUTH );
			
		JFrame frame = new JFrame();
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.setContentPane(content);
			frame.pack();
			frame.setLocationRelativeTo(null);
			frame.setVisible(true);
	}
}