sunkingjniutil.java

java绘图方面的源码 。。 。。

import java.awt.*;
public final class SunkingJNIUtil {

    private SunkingJNIUtil() {
    }
    private static SunkingJNIUtil staticInstance;
    public static SunkingJNIUtil getDefault(){
        if(staticInstance == null){
            staticInstance = new SunkingJNIUtil();
            String jawt=System.getProperty("java.home")
                       +System.getProperty("file.separator")
                       +"bin"+System.getProperty("file.separator")
                       +"jawt.dll";
			staticInstance.init(jawt);
        }
        return staticInstance;
    }
    private native void init(String jawt);
    public native void setStayOnTop(Component frame,boolean stay);
    public native void flashTitle(Component f);
    static{
		String jdkver=System.getProperty("java.version");
        if(jdkver.startsWith("1.3")){
	        System.loadLibrary("StayOnTop1_3");
		}else{
			System.loadLibrary("StayOnTop");
		}
    }
    /**
     * Fix bug for jdk1.3<BR>
     * in jdk1.3 you must add this in a visible bounds<BR>
     * and canvas's paint method can be invoke,ex:<BR>
     *<BR>
     * import java.awt.*; <BR>
     * import java.awt.event.*;<BR>
     * import javax.swing.*;<BR>
     *<BR>
     * public class TestStayOnTop extends JFrame {<BR>
     *     private Canvas STAY_ON_TOP_CANVAS =<BR>
     *                  SunkingJNIUtil.createJDK1_3StayOnTopCanvas();<BR>
     *     public TestStayOnTop() {<BR>
     *         this.setSize(400,300);<BR>
     *         STAY_ON_TOP_CANVAS.setBounds(new Rectangle(0, 0, 1, 1));<BR>
     *         this.getContentPane().setLayout(null);<BR>
     *         this.getContentPane().add(STAY_ON_TOP_CANVAS, null);<BR>
     *         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<BR>
     *     }<BR>
     *     public static void main(String[] args) {<BR>
     *         TestStayOnTop frame = new TestStayOnTop();<BR>
     *         Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();<BR>
     *         Dimension frameSize = frame.getSize();<BR>
     *         if (frameSize.height > screenSize.height) {<BR>
     *             frameSize.height = screenSize.height;<BR>
     *         }<BR>
     *         if (frameSize.width > screenSize.width) {<BR>
     *             frameSize.width = screenSize.width;<BR>
     *         }<BR>
     *         frame.setLocation((screenSize.width - frameSize.width) / 2,<BR>
     *                           (screenSize.height - frameSize.height) / 2);<BR>
     *         frame.setVisible(true);<BR>
     *         frame.show();<BR>
     *     }<BR>
     * }<BR>
     */
	public Canvas createJDK1_3StayOnTopCanvas(){
		return new Canvas(){
		    boolean isFirst = true;
			public void paint(Graphics g){
				if(isFirst){
					SunkingJNIUtil.getDefault().setStayOnTop(this,true);
	                isFirst=false;
		        }
			}
		};
	}
}