/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999, 2000 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.tools.ant.gui.modules;
import org.apache.tools.ant.gui.core.*;
import org.apache.tools.ant.gui.event.*;
import org.apache.tools.ant.gui.acs.ACSElement;
import org.apache.tools.ant.gui.acs.ACSTargetElement;
import org.apache.tools.ant.gui.acs.ElementTreeSelectionModel;
import javax.swing.*;
import javax.swing.plaf.ComponentUI;
import javax.swing.text.Document;
import java.awt.BorderLayout;
import java.awt.Insets;
import java.awt.Dimension;
import java.util.EventObject;

/**
 * A widget for displaying the currently selected targets.
 * 
 * @version $Revision$ 
 * @author Simeon Fitch 
 */
public class TargetMonitor extends AntModule {
        
    /** Place to display selected targets. */
    private JLabel _text = null;

    /** Default text. */
    private String _defText = null;

    /** 
     * Default ctor.
     * 
     */
    public TargetMonitor() {
    }

    /** 
     * Using the given AppContext, initialize the display.
     * 
     * @param context Application context.
     */
    public void contextualize(AppContext context) {
        setContext(context);
        context.getEventBus().addMember(EventBus.RESPONDING, new Handler());

        setLayout(new BorderLayout());

        _text = new JLabel();
        _text.setForeground(UIManager.getColor("TextField.foreground"));
        add(BorderLayout.NORTH, _text);


        _defText = context.getResources().getString(getClass(), "defText");
        setText(_defText);
    }

    /** 
     * Set the displayed text. 
     * 
     * @param text Text to display.
     */
    private void setText(String text) {
        _text.setText("<html>&nbsp;&nbsp;" + text + "</html>");
    }


    /** Class for handling project events. */
    private class Handler implements BusMember {
        private final Filter _filter = new Filter();

        /** 
         * Get the filter to that is used to determine if an event should
         * to to the member.
         * 
         * @return Filter to use.
         */
        public BusFilter getBusFilter() {
            return _filter;
        }
        
        /** 
         * Called when an event is to be posed to the member.
         * 
         * @param event Event to post.
         * @return true if event should be propogated, false if
         * it should be cancelled.
         */
        public boolean eventPosted(EventObject event) {
            ElementSelectionEvent e = (ElementSelectionEvent) event;
            String text = _defText;
            ACSElement[] selected = e.getSelectedElements();

            if(selected != null && selected.length > 0) {
                StringBuffer buf = new StringBuffer();
                String name = null;

                for(int i = 0; i < selected.length; i++) {
                    if(selected[i] instanceof ACSTargetElement) {
                        name = ((ACSTargetElement)selected[i]).getName();
                        if( buf.toString().indexOf( name ) < 0 ) {
                            if(buf.length() > 0) {
                                buf.append(", ");
                            }
                            buf.append( name );
                        }
                    }
                }

                if(buf.length() > 0) {
                    text = buf.toString();
                }
            }

            setText(text);

            return true;
        }
    }

    /** Class providing filtering for project events. */
    private static class Filter implements BusFilter {
        /** 
         * Determines if the given event should be accepted.
         * 
         * @param event Event to test.
         * @return True if event should be given to BusMember, false otherwise.
         */
        public boolean accept(EventObject event) {
            return event instanceof ElementSelectionEvent;
        }
    }

}