noninteractivegaugerunnable.java

来自「j2me手机应用开发环境下的UI程序」· Java 代码 · 共 65 行

/*
 *
 * Copyright © 2007 Sun Microsystems, Inc. All rights reserved.
 * Use is subject to license terms.
 */
package gauge;

import javax.microedition.lcdui.*;


/**
 * This class implements a non-interactive gauge control
 * that moves automatically, between the min and max values.
 *
 * @version 2.0
 */
public class NonInteractiveGaugeRunnable extends Gauge implements Runnable {
    private int maxValue = 10;

    /**
     * This member indicates the number of units to move per
     * iteration. It is set to -1 when we reach a 100 and 1
     * when we reach 0.
     */
    private int delta = 1;
    private boolean done = false;

    /**
     * The constructor initializes the gauge.
     */
    public NonInteractiveGaugeRunnable(String label, int maxValue, int initialValue) {
        super(label, false, maxValue, initialValue);
        this.maxValue = maxValue;
        new Thread(this).start();
    }

    /**
     * This method moves the gauge left and right.
     */
    public void run() {
        while (!done) {
            // decide whether the gauge should start moving
            // backwards or forwards.
            int newValue = getValue() + delta;

            if (newValue == maxValue) {
                delta = -1;
            } else if (newValue == 0) {
                delta = 1;
            }

            setValue(newValue);

            try {
                Thread.currentThread().sleep(1000);
            } catch (InterruptedException err) {
            }
        }
    }

    void setDone() {
        done = true;
    }
}