jdk7透明异形窗体

在jdk6中设置透明异形窗体的方法与jdk7方法的比较

Method in Java SE 6 Update 10JDK 7 EquivalentAWTUtilities.isTranslucencySupported(Translucency)GraphicsDevice.isWindowTranslucencySupported(WindowTranslucency)AWTUtilities.isTranslucencyCapable(GraphicsConfiguration)GraphicsConfiguration.isTranslucencyCapable()AWTUtilities.setWindowOpacity(Window, float)Window.setOpacity(float)AWTUtilities.setWindowShape(Window, Shape)Window.setShape(Shape)AWTUtilities.setWindowOpaque(boolean)Window.setBackground(Color) Passing new Color(0,0,0,alpha) to this method, wherealpha is less than 255, installs per-pixel translucency.jdk7判断操作系统是否支持透明窗体的设置

// Determine what the default GraphicsDevice can support.GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();GraphicsDevice gd = ge.getDefaultScreenDevice();boolean isUniformTranslucencySupported = gd.isWindowTranslucencySupported(TRANSLUCENT);//是否支持全部统一透明度的窗体boolean isPerPixelTranslucencySupported = gd.isWindowTranslucencySupported(PERPIXEL_TRANSLUCENT);//是否每部分不同透明度的窗体boolean isShapedWindowSupported = gd.isWindowTranslucencySupported(PERPIXEL_TRANSPARENT);//是否支持异性窗体System.out.println("isUniformTranslucencySupported:"+isUniformTranslucencySupported);System.out.println("isPerPixelTranslucencySupported:"+isPerPixelTranslucencySupported);System.out.println("isShapedWindowSupported:"+isShapedWindowSupported);

1.统一透明度窗体的设置

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();GraphicsDevice gd = ge.getDefaultScreenDevice();boolean isUniformTranslucencySupported = gd.isWindowTranslucencySupported(TRANSLUCENT);//是否支持全部统一透明度的窗体if(isUniformTranslucencySupported){JFrame.setDefaultLookAndFeelDecorated(true);JFrame jf=new JFrame("统一透明度");jf.setLayout(new GridBagLayout());Button bu=new Button("这是个按钮");jf.add(bu);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);jf.setBounds(100, 60, 200, 300);jf.setOpacity(0.8f);jf.setVisible(true);}

刚开始一直弄官方例子http://download.oracle.com/javase/tutorial/uiswing/misc/trans_shaped_windows.html，发现一直报错

Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is decoratedat java.awt.Frame.setOpacity(Unknown Source)

原来setOpacity方法说明

The TRANSLUCENT translucency must be supported by the underlying systemThe window must be undecorated (see setUndecorated(boolean) and Dialog.setUndecorated(boolean))The window must not be in full-screen mode (see GraphicsDevice.setFullScreenWindow(Window))

1.操作系统必须支持设置透明方法
2.窗体必须未修饰（无标题栏）
3.窗体必须非全屏模式

加上一句

JFrame.setDefaultLookAndFeelDecorated(true);