Java创建透明与任意形状窗口

Java创建透明与任意形状窗口

一： Java 2D图形基础知识

自从Java Swing发布以来，Java的图形能力得到了很大的提升，JDK6的高级版本开始支持创

建自定义形状的JFrame，结合Java 2D图形的相关API，可以实现任意形状JFrame的创建。当

前JAVA 2提供可以创建的基本形状如下：

 

当前Java提供的对2D图形的主要操作有裁剪和路径覆盖，适当的运用Java 2D与Swing的其

他相关API，可以创建出任意形状的JFrame。

 

二：API支持透明和自定义形状

从JDK6的release 10开始支持设置透明和自定义形状，支持的对象有Swing的JFrame, JDialog,

AWT的Frame.以及所以继承java.awt.Window的子类。

 

Windows的透明效果又分为两类，简单的透明效果和基于像素位的透明效果。简单透明效果使

用alpha来设置所有的象素位，值越小越透明，最小值是完全透明，最大值代表完全不透明

（opaque）windows, 基于像素为的透明效果需要通过以下API来启用：

AWTUtilities.setWindowOpaque (frame, false);

 

对于透明度和形状的设定都是通过Java的反射机制完成调用，在JDK的官方网站有一个很好的Demo里面有个AWTUtilitiesWrappe类是一个很好的示例.

 

三：一个可以改变自身形状与透明效果的JFrame

程序的主要功能是选择你想要的形状，然后点击【OK】按钮，应用程序的窗口随之改变

点击【Cancel】按钮将推出程序，移动鼠标到窗口上面，可以拖动窗口程序。

 

涉及到Swing组件有JFrame, JPanel, JButton, JComboBox

组件的位置放置使用了绝对定位的方式，需要调用setLayout(null)来声明绝对定位方式

程序启动的运行效果如下：

 

选择 Circle并点击【OK】按钮以后的效果如下：

选择 Area并点击【OK】按钮以后的效果如下：

主要的代码为JCustomFrame

 import java.awt.BorderLayout;
 import java.awt.Dimension;
 import java.awt.Shape;
 import java.awt.Toolkit;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.ComponentAdapter;
 import java.awt.event.ComponentEvent;
 import java.awt.geom.Area;
 import java.awt.geom.Ellipse2D;
 import java.awt.geom.RoundRectangle2D;
 import java.io.IOException;
 import java.util.logging.Level;
 import java.util.logging.Logger;

 import javax.imageio.ImageIO;
 import javax.swing.JFrame;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;

 public class JCustomFrame extends JFrame {

     /**
      * gloomy fish
      */
     private static final long serialVersionUID = -523336873755438297L;
     private Shape shape;
     private float alpha = 1f;
     private Dimension arcSize = new Dimension(50, 50);
     protected static final int CIRCLE_TYPE = 1;
     protected static final int RECTANGEL_TYPE = 0;
     protected static final int AREA_TYPE = 2;

     public JCustomFrame() {
         setUndecorated(true);
         setVisible(true);
         setListenersForEffects();
     }

     public JCustomFrame(int width, int height) {
         this();
         setSize(width, height);
     }

     public JCustomFrame(Shape shape, int width, int height) {
         this(width, height);
         setShape(shape);
     }

     public void setShape(Shape shape) {
         this.shape = shape;
     }

     public JCustomFrame(float alpha, Shape shape, int width, int height) {
         this(shape, width, height);
         setAlpha(alpha);
     }

     public void setAlpha(float alpha) {
         this.alpha = alpha;
     }

     private void setListenersForEffects() {
         //It is important to upadate visual effect on form resize.
         addComponentListener(new ComponentAdapter() {

             @Override
             public void componentResized(ComponentEvent evt) {
                 updateFrameEffects();
             }
         });
     }

     /**
      * This updates visual effects like SHAPE form and transparency. You have to
      * update also shape property or it paints old shape ( if you resize
      * frame without resize shape .. )
      */
     public void updateFrameEffects() {
         updateShape();
         try {
             AWTUtilitiesWrapper.setWindowShape(this, shape);
             if (shape != null) {
                 AWTUtilitiesWrapper.setWindowOpacity(this, alpha);
             }
         } catch (Exception ex) {
             Logger.getLogger(JCustomFrame.class.getName()).log(Level.SEVERE, null, ex);
         }
     }

     public void updateShape() {
         if(shape == null) {
             shape = new RoundRectangle2D.Double(0d, 0d, getWidth(), getHeight(), arcSize.width, arcSize.height);
         }

     }

     public void updateShape(int type) {
         if(type == RECTANGEL_TYPE) {
             shape = new RoundRectangle2D.Double(0d, 0d, getWidth(), getHeight(), arcSize.width, arcSize.height);
         } else if(type == CIRCLE_TYPE) {
             shape = new Ellipse2D.Double(0, 0,400, 400);
         } else if(type == AREA_TYPE) {
             Shape circle1 = new Ellipse2D.Double(0, 0,400, 400);
             Shape circle2 = new Ellipse2D.Double(200, 100,400, 400);
             Area area1 = new Area(circle1);
             Area area2 = new Area(circle2);
             area1.subtract(area2);
             shape = area1;
         }
     }

     public void center() {
         Toolkit tk = Toolkit.getDefaultToolkit();
         Dimension screenSize = tk.getScreenSize();
         int screenHeight = screenSize.height;
         int screenWidth = screenSize.width;
         this.setLocation((screenWidth - this.getWidth()) / 2, (screenHeight - this.getHeight()) / 2);
     }

     public static void main(String[] args) {
         SwingUtilities.invokeLater(new Runnable() {

             public void run() {
                 try {
                     // com.sun.java.swing.plaf.windows.WindowsLookAndFeel
                     UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
                 } catch (Exception e) {
                 }

                 /*These are simple custom panel generated with vidual editor of Netbeans
                   don't care about it, take a look only to ImagePanel inherit ( why?...)
                  */

                 // Cool transparent Frame
                 final JCustomFrame customFrame = new JCustomFrame();
                 customFrame.setLayout(new BorderLayout());

                 // create custom JPanel
                 final JImagePanel panel = new JImagePanel();
                 java.net.URL image1 = this.getClass().getResource("ball.jpg");
                 try {
                     panel.setImage(ImageIO.read(image1));
                     panel.addActionListener(new ActionListener() {

                         @Override
                         public void actionPerformed(ActionEvent e) {
                             if(e.getActionCommand().equals("OK")) {
                                 System.out.println("Transfer now......");
                                 customFrame.updateShape(panel.getSelectedIndex());
                                 if(panel.getSelectedIndex() == CIRCLE_TYPE) {
                                     customFrame.setSize(400, 400);
                                 } else if(panel.getSelectedIndex() == AREA_TYPE) {
                                     customFrame.setSize(400, 399); // force layout Manager re-computation
                                 } else {
                                     customFrame.setSize(400, 300);
                                 }
                             } else if(e.getActionCommand().equals("Cancel")) {
                                 System.out.println("System Exit......");
                                 customFrame.setVisible(false);
                                 customFrame.dispose();
                                 System.exit(0);
                             }
                         }
                     });
                 } catch (IOException e) {
                     e.printStackTrace();
                 }

                 DragBarHandler dragHandle = new DragBarHandler(customFrame);
                 customFrame.add(panel, BorderLayout.CENTER);
                 customFrame.add(dragHandle, BorderLayout.NORTH);
                 customFrame.setTitle("Ttranslucency JFrame");
                 customFrame.setSize(400, 300);
                 customFrame.setAlpha(0.8f);
                 customFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                 customFrame.center();

             }
         });

     }

 }

原博主留下的全部源码下载地址：http://download.csdn.net/download/jia20003/4334289