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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 "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
/**
 * @author Dmitry A. Durnev
 */
package com.google.code.appengine.awt;

import java.io.Serializable;

import com.google.code.appengine.awt.Event;


public class Event implements Serializable {
    private static final long serialVersionUID = 5488922509400504703L;
    public static final int SHIFT_MASK = 1;

    public static final int CTRL_MASK = 2;

    public static final int META_MASK = 4;

    public static final int ALT_MASK = 8;

    public static final int HOME = 1000;

    public static final int END = 1001;

    public static final int PGUP = 1002;

    public static final int PGDN = 1003;

    public static final int UP = 1004;

    public static final int DOWN = 1005;

    public static final int LEFT = 1006;

    public static final int RIGHT = 1007;

    public static final int F1 = 1008;

    public static final int F2 = 1009;

    public static final int F3 = 1010;

    public static final int F4 = 1011;

    public static final int F5 = 1012;

    public static final int F6 = 1013;

    public static final int F7 = 1014;

    public static final int F8 = 1015;

    public static final int F9 = 1016;

    public static final int F10 = 1017;

    public static final int F11 = 1018;

    public static final int F12 = 1019;

    public static final int PRINT_SCREEN = 1020;

    public static final int SCROLL_LOCK = 1021;

    public static final int CAPS_LOCK = 1022;

    public static final int NUM_LOCK = 1023;

    public static final int PAUSE = 1024;

    public static final int INSERT = 1025;

    public static final int ENTER = 10;

    public static final int BACK_SPACE = 8;

    public static final int TAB = 9;

    public static final int ESCAPE = 27;

    public static final int DELETE = 127;

    public static final int WINDOW_DESTROY = 201;

    public static final int WINDOW_EXPOSE = 202;

    public static final int WINDOW_ICONIFY = 203;

    public static final int WINDOW_DEICONIFY = 204;

    public static final int WINDOW_MOVED = 205;

    public static final int KEY_PRESS = 401;

    public static final int KEY_RELEASE = 402;

    public static final int KEY_ACTION = 403;

    public static final int KEY_ACTION_RELEASE = 404;

    public static final int MOUSE_DOWN = 501;

    public static final int MOUSE_UP = 502;

    public static final int MOUSE_MOVE = 503;

    public static final int MOUSE_ENTER = 504;

    public static final int MOUSE_EXIT = 505;

    public static final int MOUSE_DRAG = 506;

    public static final int SCROLL_LINE_UP = 601;

    public static final int SCROLL_LINE_DOWN = 602;

    public static final int SCROLL_PAGE_UP = 603;

    public static final int SCROLL_PAGE_DOWN = 604;

    public static final int SCROLL_ABSOLUTE = 605;

    public static final int SCROLL_BEGIN = 606;

    public static final int SCROLL_END = 607;

    public static final int LIST_SELECT = 701;

    public static final int LIST_DESELECT = 702;

    public static final int ACTION_EVENT = 1001;

    public static final int LOAD_FILE = 1002;

    public static final int SAVE_FILE = 1003;

    public static final int GOT_FOCUS = 1004;

    public static final int LOST_FOCUS = 1005;

    public Object target;

    public long when;

    public int id;

    public int x;

    public int y;

    public int key;

    public int modifiers;

    public int clickCount;

    public Object arg;

    public Event evt;

    public Event(Object target, int id, Object arg) {
        this(target, 0l, id, 0, 0, 0, 0, arg);
    }

    public Event(Object target, long when, int id, int x, int y, int key, int modifiers) {
        this(target, when, id, x, y, key, modifiers, null);
    }

    public Event(Object target, long when, int id, int x, int y, int key, int modifiers, Object arg) {
        this.target = target;
        this.when = when;
        this.id = id;
        this.x = x;
        this.y = y;
        this.key = key;
        this.modifiers = modifiers;
        this.arg = arg;
    }

    @Override
    public String toString() {
        /* The format is based on 1.5 release behavior 
         * which can be revealed by the following code:
         * 
         * Event e = new Event(new Button(), 0l, Event.KEY_PRESS, 
         *                     0, 0, Event.TAB, Event.SHIFT_MASK, "arg");
         * System.out.println(e);
         */

        return getClass().getName() + "[" + paramString() + "]"; //$NON-NLS-1$ //$NON-NLS-2$
    }

    protected String paramString() {
        return "id=" + id + ",x=" + x + ",y=" + y + //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
        (key != 0 ? ",key=" + key  + getModifiersString() : "") + //$NON-NLS-1$ //$NON-NLS-2$
        ",target=" + target + //$NON-NLS-1$
        (arg != null ? ",arg=" + arg : ""); //$NON-NLS-1$ //$NON-NLS-2$
    }

    private String getModifiersString() {
        String strMod = ""; //$NON-NLS-1$
        if (shiftDown()) {
            strMod += ",shift"; //$NON-NLS-1$
        }
        if (controlDown()) {
            strMod += ",control"; //$NON-NLS-1$
        }
        if (metaDown()) {
            strMod += ",meta"; //$NON-NLS-1$
        }
        return strMod;
    }

    public void translate(int dx, int dy) {
        x += dx;
        y += dy;
    }

    public boolean controlDown() {
        return (modifiers & CTRL_MASK) != 0;
    }

    public boolean metaDown() {
        return (modifiers & META_MASK) != 0;
    }

    public boolean shiftDown() {
        return (modifiers & SHIFT_MASK) != 0;
    }

}