splashscreen.java

来自「j2me下的1套UI框架.包含j2me开发中会应用的各种低级组件」· Java 代码 · 共 58 行

package com.jmobilecore.ui;

import com.jmobilecore.ui.core.PlatformCanvas;
import com.jmobilecore.ui.core.Color;

import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.Graphics;

/**
 * @author Greg Gridin
 */
abstract public class SplashScreen extends PlatformCanvas
        implements Runnable {

    protected Image splashImage = null;
    protected long startTime = 0;

    public SplashScreen(String _logoName) {
        super();
        try {
            splashImage = Image.createImage(_logoName);
        } catch (Exception ignored) {
        }
    }

    /**
     * Paints the logo to the screen.
     *
     * @param g The Graphics object to render to.
     */
    synchronized protected void paint(Graphics g) {

        g.setColor(Color.TRANSPARENT);
        g.fillRect(0, 0, getWidth(), getHeight());
        if (splashImage != null) {
            g.drawImage(splashImage, getWidth() / 2, (getHeight() - splashImage.getHeight()) / 2, Graphics.HCENTER | Graphics.TOP);
        }
        startTime = System.currentTimeMillis();
        (new Thread(this)).start();
    }

    synchronized public void hide(long timeout) {


        long timeLeft = timeout;
        if (startTime != 0)
            timeLeft += startTime - System.currentTimeMillis();

        if (timeLeft > 0) {
            try {
                wait(timeLeft);
            } catch (Exception ignored) {
            }
        }
        splashImage = null;
    }
} // class SplashScreen