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 <b>shape</b> 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();              }         });  	}  } 

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