是否可以在 OS X 上禁用 Java AWT 应用程序的投影？我想创建一个透明的窗口，效果很好，但我无法摆脱阴影。
如果我使用的是 aJFrame这可以使用：
JRootPane root = frame.getRootPane();
root.putClientProperty( "Window.shadow", Boolean.FALSE );
AWT 框架是否有类似的可能性？
我使用框架处理，我的代码看起来像这样：
void setup(){
frame.removeNotify();
frame.setUndecorated(true);
}
处理本身会创建主框架，这里是source。
这是一个简单的应用程序，它使用在 Java 7 下的 Max OS X 10.7.5 上运行的透明窗口（已在 Java 6 下运行），没有任何问题...
分享一些代码，以便我们可以复制问题
根据反馈更新
我已经使用 JDK 1.7.0_07 和 1.6.0_37 在 Mac OS 10.7.5 和 10.8.2 上对此进行了测试
没有和Window.shadow有财产...
在没有进行大量测试和进一步信息的情况下，我建议您尽可能早地拨打这个电话。如果这不起作用，请在使窗口可见之前将其作为最后一次调用。
这可能与 Java/AWT 如何连接到它的本机对等点有关，大概，一旦建立连接，您将不再能够影响这些类型的属性......
public class TransparentFrame {
public static void main(String[] args) {
new TransparentFrame();
}
public TransparentFrame() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
}
// Use this to test the transparentancy API
//doTransparentFrame();
doDropShadow();
}
});
}
protected void doDropShadow() {
String version = System.getProperty("java.version");
System.out.println(version);
JFrame frame = new JFrame("Testing");
JRootPane root = frame.getRootPane();
root.putClientProperty("Window.shadow", root);
frame.setUndecorated(true);
frame.setContentPane(new ContentPane());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new ImagePane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
protected void doTransparentFrame() {
JFrame frame = new JFrame("Testing");
frame.setUndecorated(true);
frame.setContentPane(new ContentPane());
String version = System.getProperty("java.version");
System.out.println(version);
if (version.startsWith("1.7")) {
frame.setBackground(new Color(0, 0, 0, 0));
} else if (version.startsWith("1.6")) {
if (supportsPerAlphaPixel()) {
setOpaque(frame, false);
} else {
System.out.println("Per Pixel Alphering is not support with Java " + version);
System.exit(1);
}
} else {
System.out.println("Per Pixel Alphering is not support with Java " + version);
System.exit(1);
}
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new ImagePane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static boolean supportsPerAlphaPixel() {
boolean support = false;
try {
Class<?> awtUtilsClass = Class.forName("com.sun.awt.AWTUtilities");
support = true;
} catch (Exception exp) {
}
return support;
}
public static void setOpaque(Window window, boolean opaque) {
try {
Class<?> awtUtilsClass = Class.forName("com.sun.awt.AWTUtilities");
if (awtUtilsClass != null) {
Method method = awtUtilsClass.getMethod("setWindowOpaque", Window.class, boolean.class);
method.invoke(null, window, opaque);
}
} catch (Exception exp) {
}
}
public class ContentPane extends JPanel {
public ContentPane() {
setOpaque(false);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.RED);
g.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
}
}
public class ImagePane extends JPanel {
private BufferedImage background;
private BufferedImage offImage;
private Ellipse2D offButton;
private boolean mouseIn;
public ImagePane() {
setOpaque(false);
try {
background = ImageIO.read(new File("tamagotchi400.png"));
offImage = ImageIO.read(new File("powerSmall.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
offButton = new Ellipse2D.Float(212, 330, 25, 25);
MouseAdapter handler = new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 1 && e.getButton() == MouseEvent.BUTTON1) {
if (offButton.contains(e.getPoint())) {
Window window = SwingUtilities.getWindowAncestor(ImagePane.this);
if (window != null) {
window.dispose();
}
}
}
}
@Override
public void mouseMoved(MouseEvent e) {
Cursor cursor = Cursor.getDefaultCursor();
if (offButton.contains(e.getPoint())) {
cursor = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
setCursor(cursor);
}
@Override
public void mouseEntered(MouseEvent e) {
mouseIn = true;
repaint();
}
@Override
public void mouseExited(MouseEvent e) {
mouseIn = false;
repaint();
}
};
addMouseListener(handler);
addMouseMotionListener(handler);
}
@Override
public Dimension getPreferredSize() {
return background == null ? new Dimension(400, 400) : new Dimension(background.getWidth(), background.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (background != null) {
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - background.getWidth()) / 2;
int y = (getHeight() - background.getHeight()) / 2;
g2d.drawImage(background, x, y, this);
if (mouseIn && offImage != null) {
g2d.drawImage(offImage, (int) offButton.getX(), (int) offButton.getY(), this);
}
g2d.dispose();
}
}
}
}
该代码还包括透明度测试代码，用于测试现在在 Java 1.7 和 Java 1.6_10+ 中可用的透明度 API。我已经在许多项目中成功使用了此代码，它比 AWT 机器人“hack”更简单，并提供了一个实时背景，但这是您需要做出的选择。
更新
演示使用java.awt.Frame
public class TestTransparentFrame {
public static void main(String[] args) {
new TestTransparentFrame();
}
public TestTransparentFrame() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception exp) {
}
Frame frame = new Frame("Test");
frame.setUndecorated(true);
setOpaque(frame, false);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.setLayout(new BorderLayout());
frame.add(new ContentPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class ContentPane extends JPanel {
private BufferedImage background;
public ContentPane() {
try {
background = ImageIO.read(new File("duke.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
setOpaque(false);
JButton close = new JButton("Close");
close.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
SwingUtilities.getWindowAncestor(ContentPane.this).dispose();
}
});
setBorder(new LineBorder(Color.RED));
setLayout(new GridBagLayout());
add(close);
}
@Override
public Dimension getPreferredSize() {
return background == null ? new Dimension(200, 200) : new Dimension(background.getWidth(), background.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (background != null) {
g.drawImage(background, 0, 0, this);
}
}
}
public static boolean supportsPerAlphaPixel() {
boolean support = false;
String version = System.getProperty("java.version");
if (version.startsWith("1.6")) {
try {
Class<?> awtUtilsClass = Class.forName("com.sun.awt.AWTUtilities");
support = true;
} catch (Exception exp) {
}
} else if (version.startsWith("1.7")) {
try {
Class<?> winTransClass = Class.forName("java.awt.GraphicsDevice$WindowTranslucency");
Field field = winTransClass.getField("TRANSLUCENT");
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
gd.isWindowTranslucencySupported(GraphicsDevice.WindowTranslucency.TRANSLUCENT);
Method isWindowTranslucencySupported = GraphicsDevice.class.getMethod("isWindowTranslucencySupported", winTransClass);
System.out.println(isWindowTranslucencySupported);
Object value = isWindowTranslucencySupported.invoke(gd, field.get(null));
if (value instanceof Boolean) {
support = ((Boolean) value).booleanValue();
}
} catch (Exception exp) {
}
}
return support;
}
public static void setOpaque(Window window, boolean opaque) {
String version = System.getProperty("java.version");
if (version.startsWith("1.6")) {
try {
Class<?> awtUtilsClass = Class.forName("com.sun.awt.AWTUtilities");
if (awtUtilsClass != null) {
Method method = awtUtilsClass.getMethod("setWindowOpaque", Window.class, boolean.class);
method.invoke(null, window, opaque);
}
} catch (Exception exp) {
}
} else if (version.startsWith("1.7")) {
Color color = UIManager.getColor("Panel.background");
if (opaque) {
color = new Color(color.getRed(), color.getGreen(), color.getBlue());
} else {
color = new Color(color.getRed(), color.getGreen(), color.getBlue(), 0);
}
window.setBackground(color);
}
}
}
在 Windows 7 Java 1.6 和 1.7、Mac OS 10.7.5 和 10.8.2 上测试，使用 JDK 1.7.0_07 和 1.6.0_37
看来您不了解 Java 中的窗口层次结构
Java 中的所有“窗口”都派生自java.awt.Window.
JFrame延伸Frame哪个延伸Window。
Using this line, it works:
AWTUtilities.setWindowOpaque(frame, false);
Eclipse prints out a warning on this and I had to change some settings to comile it, so I guess there may be better ways. I read here, that this is supported since OS X 10.6 (Lion).
似乎当你的框架没有对焦时，会触发阴影效果。尝试添加此代码，以便您的框架将无法获得焦点。
frame.setFocusableWindowState(false);
我今天在 OSX 上遇到了 JInternalFrame 的影子问题，我在另一个论坛上找到了这个解决方案（在 Java 11、Catalina 10.15 上验证）
internalFrame.putClientProperty("JInternalFrame.frameType", "normal");