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

["Steve Northover" <steve_northover@xxxxxxxxxx>]

Can't seem to find the exclusion of SWT.NO_BACKGROUND in my code.

"Ross Yakulis" <yakulis@xxxxxxxxx> wrote in message
news:beunj9$bhd$1@xxxxxxxxxxxxxx
> As for hammering  the EXStyle, I initially did not, that was just to see
if
> it
> would make a difference, it did not.   I was hoping not to have to drag
out
> the
> MS compiler, but it looks like I may have to.  Though if I have to do that
> then I may just end up writting the app in MS c++ (yuck).
>
> In reading through the swt source, the checkstylebuts for shell excluded
> SWT.NO_BACKGROUND not sure why of if this would matter.
> I will try some other things and post another reply if I figure this out.
>
> "Steve Northover" <steve_northover@xxxxxxxxxx> wrote in message
> news:beukto$86v$1@xxxxxxxxxxxxxx
> > One thing that seems funny in your code is that you hammer GWL_EXSTYLE
> > instead of just adding WS_EX_LAYERED to it.  Do you have a functioning C
> > example?  If so, it's easy to rewrite it to use the internal Windows
> > implementation classes to experiment and see what is wrong.  I wouldn't
> > suggest shipping a final product that uses the implementation classes
but
> > they are handy to see what is going on.  This is exactly the process I
use
> > when presented with a mystery.
> >
> > Another possiblilty is to temporarily hack Control.createHandle() to
> create
> > the window with the appropriate style bits?  Might make a difference?
> > (probably not).
> >
> > "Ross Yakulis" <yakulis@xxxxxxxxx> wrote in message
> > news:bemopq$2a7$1@xxxxxxxxxxxxxx
> > > 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
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
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