ch.unifr.pai.twice.utils.cursorSimulator.client.RandomCursor.java Source code

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Here is the source code for ch.unifr.pai.twice.utils.cursorSimulator.client.RandomCursor.java

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package ch.unifr.pai.twice.utils.cursorSimulator.client;

/*
 * Copyright 2013 Oliver Schmid
 * Licensed 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.
 */

import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Random;
import com.google.gwt.user.client.Window;

/**
 * This cursor moves by completely random values within the current screen size.
 * 
 * @author oli
 * 
 */
public class RandomCursor extends Cursor {

    /**
     * The interval in ms in which a new random position shall be reached
     */
    private final int interval;
    /**
     * A boolean flag defining if the movement is currently stopped
     */
    private boolean stopped;

    /**
     * @param index
     *            - @see {@link Cursor#Cursor(int, int, int)}
     * @param interval
     *            - the interval in ms in which a new random position shall be reached
     * @param startX
     *            - @see {@link Cursor#Cursor(int, int, int)}
     * @param startY
     *            - @see {@link Cursor#Cursor(int, int, int)}
     */
    public RandomCursor(int index, int interval, int startX, int startY) {
        super(index, startX, startY);
        this.interval = interval;
    }

    /**
     * Move the mouse pointer randomly (the mouse pointer does not move every time but decides on if to move within this interval depending on a random boolean
     * choice as well.
     */
    private void move() {
        int newX;
        int newY;
        if (Random.nextBoolean()) {
            newX = Random.nextInt(Window.getClientWidth() - RandomCursor.this.getOffsetWidth());
            newY = Random.nextInt(Window.getClientHeight() - RandomCursor.this.getOffsetHeight());
        } else {
            newX = RandomCursor.this.getAbsoluteLeft();
            newY = RandomCursor.this.getAbsoluteTop();
        }
        move(newX, newY, interval, moveCallback);
    }

    /**
     * Lets the movement stop
     */
    public void stop() {
        stopped = true;
    }

    /**
     * Start the movement
     */
    public void start() {
        stopped = false;
        move();
    }

    /**
     * The callback executed after every movement letting the mouse pointer move on as long as it is not stopped
     */
    private final Command moveCallback = new Command() {
        @Override
        public void execute() {
            if (!stopped) {
                int newX = Random.nextInt(Window.getClientWidth() - RandomCursor.this.getOffsetWidth());
                int newY = Random.nextInt(Window.getClientHeight() - RandomCursor.this.getOffsetHeight());

                if (Random.nextBoolean())
                    move(newX, newY, interval, moveCallback);
                else
                    moveCallback.execute();
            }
        }
    };

}