[news.eclipse.platform.swt] Re: Transparent Shell question

["Ross Yakulis" <yakulis@xxxxxxxxx>]

I have that already.


public static void main(String[] args) {
    Shell shell = new Shell(SWT.NO_TRIM);

    shell.setLayout(new FillLayout());
    shell.setBackground(new Color(null, 255, 255, 255));
    Background b = new Background(shell, 0); // draws an irregular image
    int alpha = 128; //0=transparent, 255=opaque only matters if using
LWA_ALPHA
    OS.SetWindowLong(shell.handle, OS.GWL_EXSTYLE, OSEx.WS_EX_LAYERED);
    OSEx.SetLayeredWindowAttributes(shell.handle, null, alpha,
OSEx.LWA_COLORKEY);
    shell.open();
    Display display = shell.getDisplay();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
}

Where OSEX is a native that calls :

public class OSEx {
    static {
        System.loadLibrary("osex");
    }
    public static final native boolean SetLayeredWindowAttributes(int hwnd,
RGB crKey,
            int bAlpha, int     dwFlags);
    public static final int LWA_COLORKEY = 1;
    public static final int LWA_ALPHA = 2;
    public static final int WS_EX_LAYERED = 0x80000;
}

// CPP implementation of SetLayeredWindowAttributes
JNIEXPORT jboolean JNICALL
Java_com_avaya_osex_OSEx_SetLayeredWindowAttributes
(JNIEnv *env, jclass theClass, jint windowHandle, jobject crKey, jint alpha,
jint flags) {
 SetLayeredWindowAttributes((HWND)windowHandle, (COLORREF)RGB(255,255,255),
(BYTE)alpha, (DWORD)flags );
 return( 0 );
}

"Steve Northover" <steve_northover@xxxxxxxxxx> wrote in message
news:bemnki$1ae$1@xxxxxxxxxxxxxx
> Use SWT.NO_TRIM.
>
> "Ross Yakulis" <yakulis@xxxxxxxxx> wrote in message
> news:bekc50$p3s$1@xxxxxxxxxxxxxx
> > I read the post on Nov 2002 "shell alpha channel transparency" and
> > implemented that solution.  (setting the EX_STYLE to layered window
> > and then setting the layered window attributes).  So now my shell
> > rectangular area is transparent and I can place my iregular image in it
> and
> > have the
> > shell appear as a non-rectangular window (almost).
> >
> > My problem is that no matter what combination of styles I use,
> > I always get a thin rectangular border, even though the inside
> > area of the shell is transparent.   How do I get rid of that border?
The
> > application I an creating is windows only.
> >
> > Ross
> >
> >
>
>
>