WindowUtils (JNA API)

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## com.sun.jna.platform
Class WindowUtils

    java.lang.Object
      com.sun.jna.platform.WindowUtils

    public class WindowUtils

extends Object

Provides additional features on a Java `Window`.

- Non-rectangular shape (bitmap mask, no antialiasing)
- Transparency (constant alpha applied to window contents or transparent background)
- Fully transparent window (the transparency of all painted pixels is applied to the window).

NOTE: since there is no explicit way to force PopupFactory to use a heavyweight popup, and anything but a heavyweight popup will be clipped by a window mask, an additional subwindow is added to all masked windows to implicitly force PopupFactory to use a heavyweight window and avoid clipping.

NOTE: Neither shaped windows nor transparency currently works with Java 1.4 under X11. This is at least partly due to 1.4 using multiple X11 windows for a single given Java window. It *might* be possible to remedy by applying the window region/transparency to all descendants, but I haven't tried it. In addition, windows must be both displayable and visible before the corresponding native Drawable may be obtained; in later Java versions, the window need only be displayable.

NOTE: If you use `setWindowMask(Window,Shape)` and override `Container.paint(Graphics)` on OS X, you'll need to explicitly set the clip mask on the `Graphics` object with the window mask; only the content pane of the window and below have the window mask automatically applied.

NOTE: On OSX, the property `apple.awt.draggableWindowBackground` is set automatically when a window's background color has an alpha component. That property must be set to its final value before the heavyweight peer for the Window is created. Once `Component.addNotify()` has been called on the component, causing creation of the heavyweight peer, changing this property has no effect.

See Also:
  Apple Technote 2007

Nested Class Summary
`static class` | `WindowUtils.NativeWindowUtils` Window utilities with differing native implementations.
`protected static class` | `WindowUtils.RepaintTrigger` This can be installed over a `JLayeredPane` in order to listen for repaint requests.

Field Summary
`static Shape` | `MASK_NONE` Use this to clear a window mask.

Constructor Summary
`WindowUtils()`

Method Summary
`static GraphicsConfiguration` | `getAlphaCompatibleGraphicsConfiguration()` Returns a `GraphicsConfiguration` comptible with alpha compositing.
`static boolean` | `isWindowAlphaSupported()` Indicate a window can have a global alpha setting.
`static void` | `setComponentMask(Component c, Shape mask)` Applies the given mask to the given heavyweight component.
`static void` | `setWindowAlpha(Window w, float alpha)` Set the overall window transparency.
`static void` | `setWindowMask(Window w, Icon mask)` Applies the given mask to the given window.
`static void` | `setWindowMask(Window w, Shape mask)` Applies the given mask to the given window.
`static void` | `setWindowTransparent(Window w, boolean transparent)` Set the window to be transparent.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### MASK_NONE

    public static final Shape MASK_NONE

  Use this to clear a window mask.

Constructor Detail

### WindowUtils

    public WindowUtils()

Method Detail

### setWindowMask

    public static void setWindowMask(Window w,
                                     Shape mask)

  Applies the given mask to the given window. Does nothing if the operation is not supported. The mask is treated as a bitmap and ignores transparency.

### setComponentMask

    public static void setComponentMask(Component c,
                                        Shape mask)

  Applies the given mask to the given heavyweight component. Does nothing if the operation is not supported. The mask is treated as a bitmap and ignores transparency.

### setWindowMask

    public static void setWindowMask(Window w,
                                     Icon mask)

  Applies the given mask to the given window. Does nothing if the operation is not supported. The mask is treated as a bitmap and ignores transparency.

### isWindowAlphaSupported

    public static boolean isWindowAlphaSupported()

  Indicate a window can have a global alpha setting.

### getAlphaCompatibleGraphicsConfiguration

    public static GraphicsConfiguration getAlphaCompatibleGraphicsConfiguration()

  Returns a `GraphicsConfiguration` comptible with alpha compositing.

### setWindowAlpha

    public static void setWindowAlpha(Window w,
                                      float alpha)

  Set the overall window transparency. An alpha of 1.0 is fully opaque, 0.0 fully transparent. The alpha level is applied equally to all window pixels.

  NOTE: Windows requires that `sun.java2d.noddraw=true` in order for alpha to work.

  NOTE: On OSX, the property `apple.awt.draggableWindowBackground` must be set to its final value before the heavyweight peer for the Window is created. Once `Component.addNotify()` has been called on the component, causing creation of the heavyweight peer, changing this property has no effect.

  See Also:
    Apple Technote 2007

### setWindowTransparent

    public static void setWindowTransparent(Window w,
                                            boolean transparent)

  Set the window to be transparent. Only explicitly painted pixels will be non-transparent. All pixels will be composited with whatever is under the window using their alpha values. On OSX, the property `apple.awt.draggableWindowBackground` must be set to its final value before the heavyweight peer for the Window is created. Once `Component.addNotify()` has been called on the component, causing creation of the heavyweight peer, changing this property has no effect.

  See Also:
    Apple Technote 2007

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Copyright © 2007-2010 Timothy Wall. All Rights Reserved.