// File: WindowDialog.java
// Classes: WindowDialog
// Author: Kedar Patankar

package edu.neu.ccs.demeter.tools.apstudio.graphedit;

import java.awt.Button;
import java.awt.Event;
import java.awt.List;
import java.awt.Panel;
import java.awt.Label;
import java.awt.Color;
import java.awt.BorderLayout;
import java.util.Vector;
import java.util.Enumeration;
import java.awt.Point;
import java.awt.Dimension;
import java.awt.Dialog;

import java.awt.event.ActionListener;
import java.awt.event.ItemListener;
import java.awt.event.ActionEvent;
import java.awt.event.ItemEvent;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;

/* Purpose : To show the list of all open documents(class dictionaries) and then lets user close 
multiple files or view interesting one
*/

public class WindowDialog extends Dialog implements ActionListener,ItemListener 
{
	private Button _show,_close,_cancel;
	private List _documentList;
	
	private Vector _selectedFiles;
	private Editor _editor;
	private String actionRequested;
	public WindowDialog(Editor frame,String title,Vector v) 
	{ 
		super(frame,title,true);
		_editor=frame;
		_close = new Button("Close Window");
		_cancel = new Button("Cancel");
		_show = new Button("Activate");
		_documentList = new List();
		Panel topicPanel = new Panel();
		topicPanel.setLayout(new BorderLayout());
		Label l = new Label("Select the Window");
		topicPanel.add("North",l);
		topicPanel.add("Center",_documentList );
		topicPanel.setBackground(Color.lightGray);
		_documentList .setBackground(Color.white);
		
		Panel _buttonPanel= new Panel();
		_buttonPanel.add(_show);
		_buttonPanel.add(_close);
		_buttonPanel.add(_cancel);
		_buttonPanel.setBackground(Color.lightGray);

		setLayout(new BorderLayout());
		add("Center",topicPanel);
		add("South",_buttonPanel);
		fillList(v);
		pack();
		_documentList.setMultipleMode(true);
		if(_documentList.getItemCount()<1)
		{
			_show.setEnabled(false);
			_close.setEnabled(false);
		}
		else
			_documentList .select(0);
// Addition for jdk 1.1
		_close.addActionListener(this);
		_cancel.addActionListener(this);
		_show.addActionListener(this);
		_documentList.addItemListener(this);
		addWindowListener(new WDAdapter()); // using inner class for window handling.
	}
	
	private void fillList(Vector v)
	{
		Enumeration items=v.elements();
		while (items.hasMoreElements())
		{
			String s=(String)items.nextElement();
			if(_editor.get_outStanding().contains(s)) 
				s+=" *";
			_documentList.addItem(s);
		}
	}

		
	public void setVisible(boolean status)
	{
		if(status)
		{
			_documentList.requestFocus();
			Dimension frameSize = getParent().getSize();
			Point     frameLoc  = getParent().getLocation();
			Dimension mySize    = getSize();
			int       x,y;

			x = frameLoc.x + (frameSize.width/2) -(mySize.width/2); 
			y = frameLoc.y + (frameSize.height/2)-(mySize.height/2); 
			setBounds(x,y,getSize().width,getSize().height);
		}
		super.setVisible(status);
	}

	private void checkButtons()
	{
		int[] items=_documentList.getSelectedIndexes();
		if(items.length>1)
		{
			_close.setEnabled(true);
			_show.setEnabled(false);
		}
		else
		if(items.length==0)
		{
			_close.setEnabled(false);
			_show.setEnabled(false);
		}
		else
		{
			_close.setEnabled(true);
			_show.setEnabled(true);
		}
	}
	
	public void actionPerformed(ActionEvent event)
	{
		Object source = event.getSource();
		if(source == _cancel)
		{
			actionRequested = "CANCEL";
			close();
		}
		else
		if (source == _close)
		{
			actionRequested="CLOSE";
	  	  	executeCommand();
	    }
		else
		{
			actionRequested="SHOW";
			executeCommand();
		}
	}

	private void close() {setVisible(false); _editor.setVisible(true); dispose(); }

	private void executeCommand() 
	{ 
		int[] items = _documentList.getSelectedIndexes();
		_selectedFiles = new Vector(items.length);
		for(int i=0;i<items.length;i++)
		{
			String name=_documentList.getItem(items[i]);
			int a = name.lastIndexOf(" *");
			if (a>0)
				name = name.substring(0,a);
			_selectedFiles.addElement(name);
		}
		close();
	}

	public Vector getSelection(){return _selectedFiles;}
	public String getRequest(){return actionRequested;}

	public void itemStateChanged(ItemEvent event)
	{
		checkButtons();
	}

// inner class VDAdapter
  class WDAdapter extends WindowAdapter
  {
	  public void windowClosing(WindowEvent event)
	  {
		  close();
	  }
  }
} /* end class WindowDialog */