Hi Rob,
It's not possible to draw on top of heavyweight components (like your
embedded Google Earth panel) using Java 2D. The problem with
heavyweight components is that they are, by nature, in control of
their own rendering process: their rendering "blows through" directly
to the screen, and we can't get in the way. I don't think you'll be
able to get around this restriction other than using screenshot
tricks like you suggested (in another thread). Another option would
be to use NASA's WorldWind component, which has the benefit of being
written in Java/JOGL and provides more embedding options (e.g. using
the lightweight GLJPanel, which would allow for the overlayed
rendering you're seeking).
Chris
On Dec 5, 2007, at 12:50 PM, Rob Ratcliff wrote:
Hi,
I'm trying to overlay a transparent JPanel on top of a native Window
that has been reparented using the approach below: I'm using
Overlayout
to layer to panels on top of eachother. The native Window (DirectX)
always displays above the lightweight component. I had thought that
JDK
7 allowed this, but I must not be doing something right. Has anybody
successfully done this type of thing? (I know it can be done since
JOGL
windows can be mixed with lightweight components now.)
Thanks!
Rob
void attachRenderHwnd() {
//hide GE main window
try {
User32.ShowWindow(getMainHwnd(), 0); //hide GE main window
} catch (COMException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
resizeGERenderHwnd();
//attach GE render window to the GUI
try {
FuncPtr setParent = new FuncPtr("USER32.DLL",
"SetParent");
setParent.invoke_I(getRenderHwnd(), this.getGUIHwnd(),
ReturnFlags.CHECK_FALSE);
} catch (COMException e) {
e.printStackTrace();
}
}
private void resizeGERenderHwnd() {
try {
FuncPtr moveWindow = new FuncPtr("USER32.DLL",
"MoveWindow");
// create a NakedByteStream for the serialization of Java
variables
NakedByteStream nbs = new NakedByteStream();
// wrap it in a LittleEndianOutputStream
LittleEndianOutputStream leos = new
LittleEndianOutputStream(nbs);
// and then write the Java arguments
leos.writeInt(getRenderHwnd()); //Handle to the window
Point myCorner = new Point(this.getX(),this.getY());
JFrame frame =
(JFrame)SwingUtilities.getAncestorOfClass(JFrame.class, this);
Point corner = SwingUtilities.convertPoint(this,myCorner,
frame.getContentPane());
leos.writeInt(corner.x); //Specifies the new position
of the
left side of the window
leos.writeInt(corner.y); //Specifies the new position
of the
top of the window
leos.writeInt((int) this.getWidth()); // Specifies
the new width of the window
leos.writeInt((int) this.getHeight()); // Specifies
the new height of the window
leos.writeBoolean(false); //Specifies whether the
window is to be repainted //
moveWindow.invoke("IIIII:I:", 24, nbs, null,
ReturnFlags.CHECK_FALSE);
} catch (IOException e) {
e.printStackTrace();
} catch (COMException e) {
e.printStackTrace();
}
}
public final static Field getDeclaredField(Class clazz, String
fieldName) throws NoSuchFieldException {
Class c = clazz;
while (c != null && c != Object.class) {
try {
return c.getDeclaredField(fieldName);
} catch (NoSuchFieldException e) {
}
c = c.getSuperclass();
}
throw new NoSuchFieldException(fieldName);
}
private int getGUIHwnd() {
int hwnd = 0;
System.loadLibrary("jawt");
sun.awt.windows.WToolkit tk = (sun.awt.windows.WToolkit)
this.getToolkit();
System.out.println("tk" + tk);
Window w = SwingUtilities.getWindowAncestor(this);
Object peer = tk.targetToPeer(w);
System.out.println("peer\n" + peer);
try {
Class c = peer.getClass();
System.out.println("class\n" + c);
this.f = this.getDeclaredField(c,"hwnd");
System.out.println("Field\n" + f);
f.setAccessible(true);
Object result = f.get(peer);
//return
hwnd = ((Long) result).intValue();
} catch (Throwable t) {
throw new RuntimeException(t.toString());
}
return hwnd;
}
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