package ch.werner_randelshofer.gui;

/*
Copyright (C) 1998-99 Werner Randelshofer
werner.randelshofer@mythen.ch
http://www.mythen.ch/w.randelshofer/
    
Permission to use this release of MessageDialog is hereby
granted without fee provided that the complete copyright
notice and this permission notice appear in all copies
and in supporting documentation.
*/
import java.awt.*;

/**
Message dialog conforming to AWT 1.0.2 specification.

@author	Werner Randelshofer, Staldenmattweg 2, CH-6405 Immensee, Switzerland
@version	0.2	1999-01-01	Created.
*/
public class MessageDialog
extends Dialog
	{
    /** 
     * Type meaning look and feel should not supply any options -- only
     * use the options from the JOptionPane.
     */
    public static final int         DEFAULT_OPTION = -1;
    /** Type used for showConfirmDialog. */
    public static final int         YES_NO_OPTION = 0;
    /** Type used for showConfirmDialog. */
    public static final int         YES_NO_CANCEL_OPTION = 1;
    /** Type used for showConfirmDialog. */
    public static final int         OK_CANCEL_OPTION = 2;

    //
    // Return values.
    //
    /** Return value from class method if YES is chosen. */
    public static final int         YES_OPTION = 0;
    /** Return value from class method if NO is chosen. */
    public static final int         NO_OPTION = 1;
    /** Return value from class method if CANCEL is chosen. */
    public static final int         CANCEL_OPTION = 2;
    /** Return value form class method if OK is chosen. */
    public static final int         OK_OPTION = 0;
    /** Return value from class method if user closes window without selecting
     * anything, more than likely this should be treated as either a
     * CANCEL_OPTION or NO_OPTION. */
    public static final int         CLOSED_OPTION = -1;

    //
    // Message types. Used by the UI to determine what icon to display,
    // and possibly what behavior to give based on the type.
    //
    /** Used for error messages. */
    public static final int  ERROR_MESSAGE = 0;
    /** Used for information messages. */
    public static final int  INFORMATION_MESSAGE = 1;
    /** Used for warning messages. */
    public static final int  WARNING_MESSAGE = 2;
    /** Used for questions. */
    public static final int  QUESTION_MESSAGE = 3;
    /** No icon is used. */
    public static final int   PLAIN_MESSAGE = -1;

	private int option_;

	public MessageDialog(Frame parent, String message, String title, int optionType, int messageType)
		{
		super(parent,title,true);

		Panel p = new Panel();
		p.setLayout(new GridLayout(0,1));
		
		int pos0 = 0;
		int pos1 = 0;
		while(true)
			{
			pos1 = message.indexOf('\n',pos0);
			if (pos1 == -1)
				{
				p.add(new Label(message.substring(pos0,message.length())));
				break;
				}
			else
				{
				p.add(new Label(message.substring(pos0,pos1)));
				pos0 = pos1+1;
				}
			}
		add(BorderLayout.NORTH,p);
		
		p = new Panel();
		switch (optionType)
			{
			case DEFAULT_OPTION :
				p.add(new Button("OK"));
				break;
			case YES_NO_OPTION :
				p.add(new Button("Yes"));
				p.add(new Button("No"));
				break;
			case YES_NO_CANCEL_OPTION :
				p.add(new Button("Yes"));
				p.add(new Button("No"));
				p.add(new Button("Cancel"));
				break;
			case OK_CANCEL_OPTION :
				p.add(new Button("OK"));
				p.add(new Button("Cancel"));
				break;
			}
		add(BorderLayout.SOUTH,p);
		setResizable(false);
		}
	/** Do the AWT 1.0.2 event handling. */
	public boolean handleEvent(Event event)
		{
		switch (event.id)
			{
			// Dialog closed?
			// ...Dispose it.
			case Event.WINDOW_DESTROY :
				option_ = CLOSED_OPTION;
				dispose();
				return true;

			default :
				return super.handleEvent(event);
			}
		}
	/** Do the AWT 1.0.2 event handling. */
	public boolean action(Event event, Object what)
		{
		if (what.equals("OK"))
			{
			option_ = OK_OPTION;
			hide();
			return true;
			}
		else if (what.equals("Cancel"))
			{
			option_ = CANCEL_OPTION;
			hide();
			return true;
			}
		else if (what.equals("Yes"))
			{
			option_ = YES_OPTION;
			hide();
			return true;
			}
		else if (what.equals("No"))
			{
			option_ = NO_OPTION;
			hide();
			return true;
			}
		else
			{
			return super.action(event,what);
			}
		}

	public static int showMessage(Frame parent, String message, String title)
		{
		MessageDialog md = new MessageDialog(parent,message,title,OK_OPTION,PLAIN_MESSAGE);
		md.pack();
		md.show();
		return md.option_;
		}
    public static Object showInputDialog(Frame parentComponent, Object message,
		String title, int messageType,
		Object[] selectionValues, Object initialSelectionValue)
		{
		MessageDialog md = new MessageDialog(parentComponent,message.toString(),title,OK_CANCEL_OPTION,messageType);
		List list = new List();
		md.add(BorderLayout.CENTER,list);
		for (int i=0; i < selectionValues.length; i++)
			{
			list.addItem(selectionValues[i].toString());
			if (selectionValues[i].equals(initialSelectionValue))
				{ list.select(i); }
			}
		md.setResizable(true);
		md.pack();
		md.show();
		
		if (md.option_ == OK_OPTION)
			{ return list.getSelectedIndex() == -1 ? null : selectionValues[list.getSelectedIndex()]; }
		else
			{ return null; }
		}
	/**
	Brings up a modal dialog where the number of choices is determined by the
	optionType parameter, where the messageType parameter determines the icon to
	display. The messageType parameter is primarily used to supply a default icon from
	the look and feel.

	@param	parentComponent Determines the Frame in which the dialog is displayed.
			If null, or if the parentComponent has no Frame, a default Frame is used.
	@param	message The Object to display
	@param	title	the title string for the dialog
	@param	optionType an int designating the options available on the dialog:
			YES_NO_OPTION, or YES_NO_CANCEL_OPTION
	@param	messageType an int designating the kind of message this is, primarily used
			to determine the icon from the pluggable look and feel: ERROR_MESSAGE,
			INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGE.

	@return	an int indicating the option selected by the user
	*/
	public static int showConfirmDialog(
		Frame parentComponent,
		Object message,
		String title,
		int optionType,
		int messageType)
		{
		MessageDialog md = new MessageDialog(parentComponent,message.toString(),title,optionType,messageType);
		md.pack();
		md.show();
		return md.option_;
		}
	}