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WindowUtils.java
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WindowUtils.java
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/*
* Copyright (c) 2007-2008 Timothy Wall, All Rights Reserved
* Parts Copyright (c) 2007 Olivier Chafik
*
* This library is free software; you can
* redistribute it and/or modify it under the terms of the GNU Lesser
* General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later
* version. <p/> This library is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package com.sun.jna.platform;
import java.awt.AWTEvent;
import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dialog;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.AWTEventListener;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.ContainerEvent;
import java.awt.event.HierarchyEvent;
import java.awt.event.HierarchyListener;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Area;
import java.awt.geom.PathIterator;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.JRootPane;
import javax.swing.PopupFactory;
import javax.swing.RootPaneContainer;
import javax.swing.SwingUtilities;
import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.NativeLong;
import com.sun.jna.Platform;
import com.sun.jna.Pointer;
import com.sun.jna.platform.unix.X11;
import com.sun.jna.platform.unix.X11.Display;
import com.sun.jna.platform.unix.X11.GC;
import com.sun.jna.platform.unix.X11.Pixmap;
import com.sun.jna.platform.unix.X11.XVisualInfo;
import com.sun.jna.platform.unix.X11.Xext;
import com.sun.jna.platform.unix.X11.Xrender.XRenderPictFormat;
import com.sun.jna.platform.win32.GDI32;
import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.Psapi;
import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.Win32Exception;
import com.sun.jna.platform.win32.WinNT;
import com.sun.jna.platform.win32.WinDef.DWORDByReference;
import com.sun.jna.platform.win32.WinDef.HBITMAP;
import com.sun.jna.platform.win32.WinDef.HDC;
import com.sun.jna.platform.win32.WinDef.HICON;
import com.sun.jna.platform.win32.WinDef.HRGN;
import com.sun.jna.platform.win32.WinDef.HWND;
import com.sun.jna.platform.win32.WinDef.LPARAM;
import com.sun.jna.platform.win32.WinDef.LRESULT;
import com.sun.jna.platform.win32.WinDef.POINT;
import com.sun.jna.platform.win32.WinDef.RECT;
import com.sun.jna.platform.win32.WinDef.WPARAM;
import com.sun.jna.platform.win32.WinGDI;
import com.sun.jna.platform.win32.WinGDI.BITMAP;
import com.sun.jna.platform.win32.WinGDI.BITMAPINFO;
import com.sun.jna.platform.win32.WinGDI.BITMAPINFOHEADER;
import com.sun.jna.platform.win32.WinGDI.ICONINFO;
import com.sun.jna.platform.win32.WinNT.HANDLE;
import com.sun.jna.platform.win32.WinUser;
import com.sun.jna.platform.win32.WinUser.BLENDFUNCTION;
import com.sun.jna.platform.win32.WinUser.SIZE;
import com.sun.jna.platform.win32.WinUser.WNDENUMPROC;
import com.sun.jna.ptr.ByteByReference;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.ptr.PointerByReference;
/**
* Provides additional features on a Java {@link Window}.
* <ul>
* <li>Non-rectangular shape (bitmap mask, no antialiasing)
* <li>Transparency (constant alpha applied to window contents or
* transparent background)
* <li>Fully transparent window (the transparency of all painted pixels is
* applied to the window).
* </ul>
* 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.
* <p>
* 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 <em>and</em> visible
* before the corresponding native Drawable may be obtained; in later
* Java versions, the window need only be displayable.
* <p>
* NOTE: If you use {@link #setWindowMask(Window,Shape)} and override {@link
* Window#paint(Graphics)} on OS X, you'll need to explicitly set the clip
* mask on the <code>Graphics</code> object with the window mask; only the
* content pane of the window and below have the window mask automatically
* applied.<p>
* NOTE: On OSX, the property
* <code>apple.awt.draggableWindowBackground</code> is set automatically when
* a window's background color has an alpha component. That property must be
* set to its final value <em>before</em> the heavyweight peer for the Window
* is created. Once {@link Component#addNotify} has been called on the
* component, causing creation of the heavyweight peer, changing this
* property has no effect.
* @see <a href="http://developer.apple.com/technotes/tn2007/tn2196.html#APPLE_AWT_DRAGGABLEWINDOWBACKGROUND">Apple Technote 2007</a>
*
* @author Andreas "PAX" Lück, onkelpax-git[at]yahoo.de
*/
// TODO: setWindowMask() should accept a threshold; some cases want a
// 50% threshold, some might want zero/non-zero
public class WindowUtils {
private static final String TRANSPARENT_OLD_BG = "transparent-old-bg";
private static final String TRANSPARENT_OLD_OPAQUE = "transparent-old-opaque";
private static final String TRANSPARENT_ALPHA = "transparent-alpha";
/** Use this to clear a window mask. */
public static final Shape MASK_NONE = null;
/**
* This class forces a heavyweight popup on the parent
* {@link Window}. See the implementation of {@link PopupFactory};
* a heavyweight is forced if there is an occluding subwindow on the
* target window.
* <p>
* Ideally we'd have more control over {@link PopupFactory} but this
* is a fairly simple, lightweight workaround. Note that, at least as of
* JDK 1.6, the following do not have the desired effect:<br>
* <pre><code>
* ToolTipManager.sharedInstance().setLightWeightPopupEnabled(false);
* JPopupMenu.setDefaultLightWeightPopupEnabled(false);
* System.setProperty("JPopupMenu.defaultLWPopupEnabledKey", "false");
* </code></pre>
*/
private static class HeavyweightForcer extends Window {
private static final long serialVersionUID = 1L;
private final boolean packed;
public HeavyweightForcer(Window parent) {
super(parent);
pack();
packed = true;
}
public boolean isVisible() {
// Only want to be 'visible' once the peer is instantiated
// via pack; this tricks PopupFactory into using a heavyweight
// popup to avoid being obscured by this window
return packed;
}
public Rectangle getBounds() {
return getOwner().getBounds();
}
}
/**
* This can be installed over a {@link JLayeredPane} in order to
* listen for repaint requests. The content's repaint method will be
* invoked whenever any part of the ancestor window is repainted.
*/
protected static class RepaintTrigger extends JComponent {
private static final long serialVersionUID = 1L;
protected class Listener
extends WindowAdapter
implements ComponentListener, HierarchyListener, AWTEventListener {
public void windowOpened(WindowEvent e) {
repaint();
}
public void componentHidden(ComponentEvent e) {}
public void componentMoved(ComponentEvent e) {}
public void componentResized(ComponentEvent e) {
setSize(getParent().getSize());
repaint();
}
public void componentShown(ComponentEvent e) {
repaint();
}
public void hierarchyChanged(HierarchyEvent e) {
repaint();
}
public void eventDispatched(AWTEvent e) {
if (e instanceof MouseEvent) {
Component src = ((MouseEvent)e).getComponent();
if (src != null
&& SwingUtilities.isDescendingFrom(src, content)) {
MouseEvent me = SwingUtilities.convertMouseEvent(src, (MouseEvent)e, content);
Component c = SwingUtilities.getDeepestComponentAt(content, me.getX(), me.getY());
if (c != null) {
setCursor(c.getCursor());
}
}
}
}
}
private final Listener listener = createListener();
private final JComponent content;
public RepaintTrigger(JComponent content) {
this.content = content;
}
public void addNotify() {
super.addNotify();
Window w = SwingUtilities.getWindowAncestor(this);
setSize(getParent().getSize());
w.addComponentListener(listener);
w.addWindowListener(listener);
Toolkit.getDefaultToolkit().addAWTEventListener(listener, AWTEvent.MOUSE_EVENT_MASK|AWTEvent.MOUSE_MOTION_EVENT_MASK);
}
public void removeNotify() {
Toolkit.getDefaultToolkit().removeAWTEventListener(listener);
Window w = SwingUtilities.getWindowAncestor(this);
w.removeComponentListener(listener);
w.removeWindowListener(listener);
super.removeNotify();
}
private Rectangle dirty;
protected void paintComponent(Graphics g) {
Rectangle bounds = g.getClipBounds();
if (dirty == null || !dirty.contains(bounds)) {
if (dirty == null) {
dirty = bounds;
}
else {
dirty = dirty.union(bounds);
}
content.repaint(dirty);
}
else {
dirty = null;
}
}
protected Listener createListener() {
return new Listener();
}
};
/** Window utilities with differing native implementations. */
public static abstract class NativeWindowUtils {
protected abstract class TransparentContentPane
extends JPanel implements AWTEventListener {
private static final long serialVersionUID = 1L;
private boolean transparent;
public TransparentContentPane(Container oldContent) {
super(new BorderLayout());
add(oldContent, BorderLayout.CENTER);
setTransparent(true);
if (oldContent instanceof JPanel) {
((JComponent)oldContent).setOpaque(false);
}
}
public void addNotify() {
super.addNotify();
Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.CONTAINER_EVENT_MASK);
}
public void removeNotify() {
Toolkit.getDefaultToolkit().removeAWTEventListener(this);
super.removeNotify();
}
public void setTransparent(boolean transparent) {
this.transparent = transparent;
setOpaque(!transparent);
setDoubleBuffered(!transparent);
repaint();
}
public void eventDispatched(AWTEvent e) {
if (e.getID() == ContainerEvent.COMPONENT_ADDED
&& SwingUtilities.isDescendingFrom(((ContainerEvent)e).getChild(), this)) {
Component child = ((ContainerEvent)e).getChild();
NativeWindowUtils.this.setDoubleBuffered(child, false);
}
}
public void paint(Graphics gr) {
if (transparent) {
Rectangle r = gr.getClipBounds();
final int w = r.width;
final int h = r.height;
if (getWidth() > 0 && getHeight() > 0) {
final BufferedImage buf =
new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB_PRE);
Graphics2D g = buf.createGraphics();
g.setComposite(AlphaComposite.Clear);
g.fillRect(0, 0, w, h);
g.dispose();
g = buf.createGraphics();
g.translate(-r.x, -r.y);
super.paint(g);
g.dispose();
paintDirect(buf, r);
}
}
else {
super.paint(gr);
}
}
/** Use the contents of the given BufferedImage to paint directly
* on this component's ancestor window.
*/
protected abstract void paintDirect(BufferedImage buf, Rectangle bounds);
}
protected Window getWindow(Component c) {
return c instanceof Window
? (Window)c : SwingUtilities.getWindowAncestor(c);
}
/**
* Execute the given action when the given window becomes
* displayable.
*/
protected void whenDisplayable(Component w, final Runnable action) {
if (w.isDisplayable() && (!Holder.requiresVisible || w.isVisible())) {
action.run();
}
else if (Holder.requiresVisible) {
getWindow(w).addWindowListener(new WindowAdapter() {
public void windowOpened(WindowEvent e) {
e.getWindow().removeWindowListener(this);
action.run();
}
public void windowClosed(WindowEvent e) {
e.getWindow().removeWindowListener(this);
}
});
}
else {
// Hierarchy events are fired in direct response to
// displayability changes
w.addHierarchyListener(new HierarchyListener() {
public void hierarchyChanged(HierarchyEvent e) {
if ((e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0
&& e.getComponent().isDisplayable()) {
e.getComponent().removeHierarchyListener(this);
action.run();
}
}
});
}
}
protected Raster toRaster(Shape mask) {
Raster raster = null;
if (mask != MASK_NONE) {
Rectangle bounds = mask.getBounds();
if (bounds.width > 0 && bounds.height > 0) {
BufferedImage clip =
new BufferedImage(bounds.x + bounds.width,
bounds.y + bounds.height,
BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g = clip.createGraphics();
g.setColor(Color.black);
g.fillRect(0, 0, bounds.x + bounds.width, bounds.y + bounds.height);
g.setColor(Color.white);
g.fill(mask);
raster = clip.getRaster();
}
}
return raster;
}
protected Raster toRaster(Component c, Icon mask) {
Raster raster = null;
if (mask != null) {
Rectangle bounds = new Rectangle(0, 0, mask.getIconWidth(),
mask.getIconHeight());
BufferedImage clip = new BufferedImage(bounds.width,
bounds.height,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g = clip.createGraphics();
g.setComposite(AlphaComposite.Clear);
g.fillRect(0, 0, bounds.width, bounds.height);
g.setComposite(AlphaComposite.SrcOver);
mask.paintIcon(c, g, 0, 0);
raster = clip.getAlphaRaster();
}
return raster;
}
protected Shape toShape(Raster raster) {
final Area area = new Area(new Rectangle(0, 0, 0, 0));
RasterRangesUtils.outputOccupiedRanges(raster, new RasterRangesUtils.RangesOutput() {
public boolean outputRange(int x, int y, int w, int h) {
area.add(new Area(new Rectangle(x, y, w, h)));
return true;
}
});
return area;
}
/**
* Set the overall alpha transparency of the window. An alpha of
* 1.0 is fully opaque, 0.0 is fully transparent.
*/
public void setWindowAlpha(Window w, float alpha) {
// do nothing
}
/** Default: no support. */
public boolean isWindowAlphaSupported() {
return false;
}
/** Return the default graphics configuration. */
public GraphicsConfiguration getAlphaCompatibleGraphicsConfiguration() {
GraphicsEnvironment env = GraphicsEnvironment
.getLocalGraphicsEnvironment();
GraphicsDevice dev = env.getDefaultScreenDevice();
return dev.getDefaultConfiguration();
}
/**
* 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.
*/
public void setWindowTransparent(Window w, boolean transparent) {
// do nothing
}
protected void setDoubleBuffered(Component root, boolean buffered) {
if (root instanceof JComponent) {
((JComponent)root).setDoubleBuffered(buffered);
}
if (root instanceof JRootPane && buffered) {
((JRootPane)root).setDoubleBuffered(true);
}
else if (root instanceof Container) {
Component[] kids = ((Container)root).getComponents();
for (int i=0;i < kids.length;i++) {
setDoubleBuffered(kids[i], buffered);
}
}
}
protected void setLayersTransparent(Window w, boolean transparent) {
Color bg = transparent ? new Color(0, 0, 0, 0) : null;
if (w instanceof RootPaneContainer) {
RootPaneContainer rpc = (RootPaneContainer)w;
JRootPane root = rpc.getRootPane();
JLayeredPane lp = root.getLayeredPane();
Container c = root.getContentPane();
JComponent content =
(c instanceof JComponent) ? (JComponent)c : null;
if (transparent) {
lp.putClientProperty(TRANSPARENT_OLD_OPAQUE,
Boolean.valueOf(lp.isOpaque()));
lp.setOpaque(false);
root.putClientProperty(TRANSPARENT_OLD_OPAQUE,
Boolean.valueOf(root.isOpaque()));
root.setOpaque(false);
if (content != null) {
content.putClientProperty(TRANSPARENT_OLD_OPAQUE,
Boolean.valueOf(content.isOpaque()));
content.setOpaque(false);
}
root.putClientProperty(TRANSPARENT_OLD_BG,
root.getParent().getBackground());
}
else {
lp.setOpaque(Boolean.TRUE.equals(lp.getClientProperty(TRANSPARENT_OLD_OPAQUE)));
lp.putClientProperty(TRANSPARENT_OLD_OPAQUE, null);
root.setOpaque(Boolean.TRUE.equals(root.getClientProperty(TRANSPARENT_OLD_OPAQUE)));
root.putClientProperty(TRANSPARENT_OLD_OPAQUE, null);
if (content != null) {
content.setOpaque(Boolean.TRUE.equals(content.getClientProperty(TRANSPARENT_OLD_OPAQUE)));
content.putClientProperty(TRANSPARENT_OLD_OPAQUE, null);
}
bg = (Color)root.getClientProperty(TRANSPARENT_OLD_BG);
root.putClientProperty(TRANSPARENT_OLD_BG, null);
}
}
w.setBackground(bg);
}
/** Override this method to provide bitmap masking of the given
* heavyweight component.
*/
protected void setMask(Component c, Raster raster) {
throw new UnsupportedOperationException("Window masking is not available");
}
/**
* Set the window mask based on the given Raster, which should
* be treated as a bitmap (zero/nonzero values only). A value of
* <code>null</code> means to remove the mask.
*/
protected void setWindowMask(Component w, Raster raster) {
if (w.isLightweight())
throw new IllegalArgumentException("Component must be heavyweight: " + w);
setMask(w, raster);
}
/** Set the window mask based on a {@link Shape}. */
public void setWindowMask(Component w, Shape mask) {
setWindowMask(w, toRaster(mask));
}
/**
* Set the window mask based on an Icon. All non-transparent
* pixels will be included in the mask.
*/
public void setWindowMask(Component w, Icon mask) {
setWindowMask(w, toRaster(w, mask));
}
/**
* Use this method to ensure heavyweight popups are used in
* conjunction with a given window. This prevents the window's
* alpha setting or mask region from being applied to the popup.
*/
protected void setForceHeavyweightPopups(Window w, boolean force) {
if (!(w instanceof HeavyweightForcer)) {
Window[] owned = w.getOwnedWindows();
for (int i = 0; i < owned.length; i++) {
if (owned[i] instanceof HeavyweightForcer) {
if (force)
return;
owned[i].dispose();
}
}
Boolean b = Boolean.valueOf(System.getProperty("jna.force_hw_popups", "true"));
if (force && b.booleanValue()) {
new HeavyweightForcer(w);
}
}
}
/**
* Obtains the set icon for the window associated with the specified
* window handle.
*
* @param hwnd
* The concerning window handle.
* @return Either the window's icon or {@code null} if an error
* occurred.
*
* @throws UnsupportedOperationException
* Thrown if this method wasn't yet implemented for the
* current platform.
*/
protected BufferedImage getWindowIcon(final HWND hwnd) {
throw new UnsupportedOperationException("This platform is not supported, yet.");
}
/**
* Detects the size of an icon.
*
* @param hIcon
* The icon handle type.
* @return Either the requested icon's dimension or an {@link Dimension}
* instance of {@code (0, 0)}.
*
* @throws UnsupportedOperationException
* Thrown if this method wasn't yet implemented for the
* current platform.
*/
protected Dimension getIconSize(final HICON hIcon) {
throw new UnsupportedOperationException("This platform is not supported, yet.");
}
/**
* Requests a list of all currently available Desktop windows.
*
* @param onlyVisibleWindows
* Specifies whether only currently visible windows will be
* considered ({@code true}). That are windows which are not
* minimized. The {@code WS_VISIBLE} flag will be checked
* (see: <a href=
* "https://msdn.microsoft.com/de-de/library/windows/desktop/ms633530%28v=vs.85%29.aspx"
* >User32.IsWindowVisible(HWND)</a>).
*
* @return A list with all windows and some detailed information.
*
* @throws UnsupportedOperationException
* Thrown if this method wasn't yet implemented for the
* current platform.
*/
protected List<DesktopWindow> getAllWindows(final boolean onlyVisibleWindows) {
throw new UnsupportedOperationException("This platform is not supported, yet.");
}
/**
* Tries to obtain the Window's title which belongs to the specified
* window handle.
*
* @param hwnd
* The concerning window handle.
* @return Either the title or an empty string of no title was found or
* an error occurred.
*
* @throws UnsupportedOperationException
* Thrown if this method wasn't yet implemented for the
*/
protected String getWindowTitle(final HWND hwnd) {
throw new UnsupportedOperationException("This platform is not supported, yet.");
}
/**
* Detects the full file path of the process associated with the specified
* window handle.
*
* @param hwnd
* The concerning window handle for which the PE file path is
* required.
* @return The full file path of the PE file that is associated with the
* specified window handle.
*
* @throws UnsupportedOperationException
* Thrown if this method wasn't yet implemented for the
*/
protected String getProcessFilePath(final HWND hwnd){
throw new UnsupportedOperationException("This platform is not supported, yet.");
}
/**
* Requests the location and size of the window associated with the
* specified window handle.
*
* @param hwnd
* The concerning window handle.
* @return The location and size of the window.
*
* @throws UnsupportedOperationException
* Thrown if this method wasn't yet implemented for the
*/
protected Rectangle getWindowLocationAndSize(final HWND hwnd) {
throw new UnsupportedOperationException("This platform is not supported, yet.");
}
}
/** Canonical lazy loading of a singleton. */
private static class Holder {
/**
* Indicates whether a window must be visible before its native
* handle can be obtained. This wart is caused by the Java
* 1.4/X11 implementation.
*/
public static boolean requiresVisible;
public static final NativeWindowUtils INSTANCE;
static {
if (Platform.isWindows()) {
INSTANCE = new W32WindowUtils();
}
else if (Platform.isMac()) {
INSTANCE = new MacWindowUtils();
}
else if (Platform.isX11()) {
INSTANCE = new X11WindowUtils();
requiresVisible = System.getProperty("java.version")
.matches("^1\\.4\\..*");
}
else {
String os = System.getProperty("os.name");
throw new UnsupportedOperationException("No support for " + os);
}
}
}
private static NativeWindowUtils getInstance() {
return Holder.INSTANCE;
}
private static class W32WindowUtils extends NativeWindowUtils {
private HWND getHWnd(Component w) {
HWND hwnd = new HWND();
hwnd.setPointer(Native.getComponentPointer(w));
return hwnd;
}
/**
* W32 alpha will only work if <code>sun.java2d.noddraw</code>
* is set
*/
public boolean isWindowAlphaSupported() {
return Boolean.getBoolean("sun.java2d.noddraw");
}
/** Indicates whether UpdateLayeredWindow is in use. */
private boolean usingUpdateLayeredWindow(Window w) {
if (w instanceof RootPaneContainer) {
JRootPane root = ((RootPaneContainer)w).getRootPane();
return root.getClientProperty(TRANSPARENT_OLD_BG) != null;
}
return false;
}
/** Keep track of the alpha level, since we can't read it from
* the window itself.
*/
private void storeAlpha(Window w, byte alpha) {
if (w instanceof RootPaneContainer) {
JRootPane root = ((RootPaneContainer)w).getRootPane();
Byte b = alpha == (byte)0xFF ? null : Byte.valueOf(alpha);
root.putClientProperty(TRANSPARENT_ALPHA, b);
}
}
/** Return the last alpha level we set on the window. */
private byte getAlpha(Window w) {
if (w instanceof RootPaneContainer) {
JRootPane root = ((RootPaneContainer)w).getRootPane();
Byte b = (Byte)root.getClientProperty(TRANSPARENT_ALPHA);
if (b != null) {
return b.byteValue();
}
}
return (byte)0xFF;
}
public void setWindowAlpha(final Window w, final float alpha) {
if (!isWindowAlphaSupported()) {
throw new UnsupportedOperationException("Set sun.java2d.noddraw=true to enable transparent windows");
}
whenDisplayable(w, new Runnable() {
public void run() {
HWND hWnd = getHWnd(w);
User32 user = User32.INSTANCE;
int flags = user.GetWindowLong(hWnd, WinUser.GWL_EXSTYLE);
byte level = (byte)((int)(255 * alpha) & 0xFF);
if (usingUpdateLayeredWindow(w)) {
// If already using UpdateLayeredWindow, continue to
// do so
BLENDFUNCTION blend = new BLENDFUNCTION();
blend.SourceConstantAlpha = level;
blend.AlphaFormat = WinUser.AC_SRC_ALPHA;
user.UpdateLayeredWindow(hWnd, null, null, null, null,
null, 0, blend,
WinUser.ULW_ALPHA);
}
else if (alpha == 1f) {
flags &= ~WinUser.WS_EX_LAYERED;
user.SetWindowLong(hWnd, WinUser.GWL_EXSTYLE, flags);
}
else {
flags |= WinUser.WS_EX_LAYERED;
user.SetWindowLong(hWnd, WinUser.GWL_EXSTYLE, flags);
user.SetLayeredWindowAttributes(hWnd, 0, level,
WinUser.LWA_ALPHA);
}
setForceHeavyweightPopups(w, alpha != 1f);
storeAlpha(w, level);
}
});
}
/** W32 makes the client responsible for repainting the <em>entire</em>
* window on any change. It also does not paint window decorations
* when the window is transparent.
*/
private class W32TransparentContentPane extends TransparentContentPane {
private static final long serialVersionUID = 1L;
private HDC memDC;
private HBITMAP hBitmap;
private Pointer pbits;
private Dimension bitmapSize;
public W32TransparentContentPane(Container content) {
super(content);
}
private void disposeBackingStore() {
GDI32 gdi = GDI32.INSTANCE;
if (hBitmap != null) {
gdi.DeleteObject(hBitmap);
hBitmap = null;
}
if (memDC != null) {
gdi.DeleteDC(memDC);
memDC = null;
}
}
public void removeNotify() {
super.removeNotify();
disposeBackingStore();
}
public void setTransparent(boolean transparent) {
super.setTransparent(transparent);
if (!transparent) {
disposeBackingStore();
}
}
protected void paintDirect(BufferedImage buf, Rectangle bounds) {
// TODO: paint frame decoration if window is decorated
Window win = SwingUtilities.getWindowAncestor(this);
GDI32 gdi = GDI32.INSTANCE;
User32 user = User32.INSTANCE;
int x = bounds.x;
int y = bounds.y;
Point origin = SwingUtilities.convertPoint(this, x, y, win);
int w = bounds.width;
int h = bounds.height;
int ww = win.getWidth();
int wh = win.getHeight();
HDC screenDC = user.GetDC(null);
HANDLE oldBitmap = null;
try {
if (memDC == null) {
memDC = gdi.CreateCompatibleDC(screenDC);
}
if (hBitmap == null || !win.getSize().equals(bitmapSize)) {
if (hBitmap != null) {
gdi.DeleteObject(hBitmap);
hBitmap = null;
}
BITMAPINFO bmi = new BITMAPINFO();
bmi.bmiHeader.biWidth = ww;
bmi.bmiHeader.biHeight = wh;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = WinGDI.BI_RGB;
bmi.bmiHeader.biSizeImage = ww * wh * 4;
PointerByReference ppbits = new PointerByReference();
hBitmap = gdi.CreateDIBSection(memDC, bmi,
WinGDI.DIB_RGB_COLORS,
ppbits, null, 0);
pbits = ppbits.getValue();
bitmapSize = new Dimension(ww, wh);
}
oldBitmap = gdi.SelectObject(memDC, hBitmap);
Raster raster = buf.getData();
int[] pixel = new int[4];
int[] bits = new int[w];
for (int row = 0; row < h; row++) {
for (int col = 0; col < w; col++) {
raster.getPixel(col, row, pixel);
int alpha = (pixel[3] & 0xFF) << 24;
int red = (pixel[2] & 0xFF);
int green = (pixel[1] & 0xFF) << 8;
int blue = (pixel[0] & 0xFF) << 16;
bits[col] = alpha | red | green | blue;
}
int v = wh - (origin.y + row) - 1;
pbits.write((v*ww+origin.x)*4, bits, 0, bits.length);
}
SIZE winSize = new SIZE();
winSize.cx = win.getWidth();
winSize.cy = win.getHeight();
POINT winLoc = new POINT();
winLoc.x = win.getX();
winLoc.y = win.getY();
POINT srcLoc = new POINT();
BLENDFUNCTION blend = new BLENDFUNCTION();
HWND hWnd = getHWnd(win);
// extract current constant alpha setting, if possible
ByteByReference bref = new ByteByReference();
IntByReference iref = new IntByReference();
byte level = getAlpha(win);
try {
// GetLayeredwindowAttributes supported WinXP and later
if (user.GetLayeredWindowAttributes(hWnd, null, bref, iref)
&& (iref.getValue() & WinUser.LWA_ALPHA) != 0) {
level = bref.getValue();
}
}
catch(UnsatisfiedLinkError e) {
}
blend.SourceConstantAlpha = level;
blend.AlphaFormat = WinUser.AC_SRC_ALPHA;
user.UpdateLayeredWindow(hWnd, screenDC, winLoc, winSize, memDC,
srcLoc, 0, blend, WinUser.ULW_ALPHA);
} finally {
user.ReleaseDC(null, screenDC);
if (memDC != null && oldBitmap != null) {
gdi.SelectObject(memDC, oldBitmap);
}
}
}
}
/** Note that w32 does <em>not</em> paint window decorations when
* the window is transparent.
*/
public void setWindowTransparent(final Window w,
final boolean transparent) {
if (!(w instanceof RootPaneContainer)) {
throw new IllegalArgumentException("Window must be a RootPaneContainer");
}
if (!isWindowAlphaSupported()) {
throw new UnsupportedOperationException("Set sun.java2d.noddraw=true to enable transparent windows");
}
boolean isTransparent = w.getBackground() != null
&& w.getBackground().getAlpha() == 0;
if (transparent == isTransparent)
return;
whenDisplayable(w, new Runnable() {
public void run() {
User32 user = User32.INSTANCE;
HWND hWnd = getHWnd(w);
int flags = user.GetWindowLong(hWnd, WinUser.GWL_EXSTYLE);
JRootPane root = ((RootPaneContainer)w).getRootPane();
JLayeredPane lp = root.getLayeredPane();
Container content = root.getContentPane();
if (content instanceof W32TransparentContentPane) {
((W32TransparentContentPane)content).setTransparent(transparent);
}
else if (transparent) {
W32TransparentContentPane w32content =
new W32TransparentContentPane(content);
root.setContentPane(w32content);
lp.add(new RepaintTrigger(w32content),
JLayeredPane.DRAG_LAYER);
}
if (transparent && !usingUpdateLayeredWindow(w)) {
flags |= WinUser.WS_EX_LAYERED;
user.SetWindowLong(hWnd, WinUser.GWL_EXSTYLE, flags);
}
else if (!transparent && usingUpdateLayeredWindow(w)) {
flags &= ~WinUser.WS_EX_LAYERED;
user.SetWindowLong(hWnd, WinUser.GWL_EXSTYLE, flags);
}
setLayersTransparent(w, transparent);
setForceHeavyweightPopups(w, transparent);
setDoubleBuffered(w, !transparent);
}
});
}
public void setWindowMask(final Component w, final Shape mask) {
if (mask instanceof Area && ((Area)mask).isPolygonal()) {
setMask(w, (Area)mask);
}
else {
super.setWindowMask(w, mask);
}
}
// NOTE: Deletes hrgn after setting the window region
private void setWindowRegion(final Component w, final HRGN hrgn) {
whenDisplayable(w, new Runnable() {
public void run() {
GDI32 gdi = GDI32.INSTANCE;
User32 user = User32.INSTANCE;
HWND hWnd = getHWnd(w);
try {
user.SetWindowRgn(hWnd, hrgn, true);
setForceHeavyweightPopups(getWindow(w), hrgn != null);
}
finally {
gdi.DeleteObject(hrgn);
}
}
});
}
// Take advantage of CreatePolyPolygonalRgn on w32
private void setMask(final Component w, final Area area) {
GDI32 gdi = GDI32.INSTANCE;
PathIterator pi = area.getPathIterator(null);
int mode = pi.getWindingRule() == PathIterator.WIND_NON_ZERO
? WinGDI.WINDING: WinGDI.ALTERNATE;
float[] coords = new float[6];
List<POINT> points = new ArrayList<POINT>();
int size = 0;