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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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 * KIND, either express or implied.  See the License for the
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package org.openoffice.setup.Util;

import java.awt.FocusTraversalPolicy;
import javax.swing.JComponent;

public class DialogFocusTraversalPolicy extends FocusTraversalPolicy {
	
    private JComponent order[];
    private java.util.List list;
    
    public DialogFocusTraversalPolicy(JComponent _order[]) {
    	order = _order;
    	list = java.util.Arrays.asList(order);
    }

    public java.awt.Component getFirstComponent(java.awt.Container focusCycleRoot) { 
        return order[0];
    } 

    public java.awt.Component getLastComponent(java.awt.Container focusCycleRoot) { 
        return order[order.length - 1];
    }

    public java.awt.Component getComponentAfter(java.awt.Container focusCycleRoot, java.awt.Component aComponent) {
        int index = 0,x = -1; 
        index = list.indexOf(aComponent); 
        index++; // increasing automatically
        if(!order[index % order.length].isEnabled() || 
           !order[index % order.length].isVisible()) {
            x = index; 
            index = -1;
            for (; x != order.length; x++) {
                if(order[x].isEnabled() && order[x].isVisible()) {
                    index = x;
                    break;
                }
            }
            if(index == -1) { 
                x = list.indexOf(aComponent); 
                for(int y = 0; y <= x; y++) { 
                    if(order[y].isEnabled() && order[x].isVisible()) {
                        index = y;
                        break;
                    }
                }
            }
        }
        return order[ index % order.length]; 
    }

    public java.awt.Component getComponentBefore(java.awt.Container focusCycleRoot, java.awt.Component aComponent) {
        int index = list.indexOf(aComponent), x = -1; 
        index--;
        if(!order[(index + order.length) % order.length].isEnabled() ||
           !order[(index + order.length) % order.length].isVisible()) {
            x = index; 
            index = -1; 
            for(; x >= 0; x--) { 
                if(order[x].isEnabled() && order[x].isVisible()) { 
                    index = x;
                    break;
                }
            }
            // if nothing has changed 
            if(index == -1) {
                x = list.indexOf(aComponent);
                for(int y = order.length -1; y >= x; y--) { 
                    if(order[y].isEnabled() && order[x].isVisible()) {
                        index = y;
                        break;
                    }
                }
            }
        }
        return order[ (index + order.length) % order.length]; 
    }

    public java.awt.Component getDefaultComponent(java.awt.Container focusCycleRoot) { 
        return order[0];
    }

    public java.awt.Component getInitialComponent(java.awt.Window window) { 
        return order[0];
    }

}