Using per-pixel opacity and there's nothing to see

Using per-pixel opacity and there's nothing to see

• moleman

  this might help

  http://blogs.msdn.com/llobo/archive/2006/02/24/538757.aspx

  
  

• Wilfred Tang

  Hi,

  Can you include some code for me to take a look at, might be easier to see what the problem is

  Thanks

  Andy

  
  

• HSS Guido

  Hi Kimme,

  > At first, I had two windows open, but I fixed that. But all I see now is that there's a window open, but not visible.

  Can you describe the problem in a bit more detail Do you see the chrome of the window with a black box No window/chrome at all

  thx, Seema

  
  
  

• MARUN

  Here it is...
  
  public partial class MyApp : Application {
  HwndSource testHwnd;
  
  protected override void OnStartup(StartupEventArgs e) {
  base.OnStartup(e);
  Rect workArea = SystemParameters.WorkArea;
  HwndSourceParameters parameters = new HwndSourceParameters("TestWindow");
  parameters.PositionX = (int)(workArea.Width/2);
  parameters.PositionY = (int)(workArea.Height/2);
  parameters.UsesPerPixelOpacity = true;
  testHwnd = new HwndSource(parameters);
  object o = Application.LoadComponent(new Uri("Window1.baml",
  UriKind.Relative));
  FrameworkElement child = o as FrameworkElement;
  testHwnd.RootVisual = child;
  testHwnd.Disposed += new EventHandler(testHwnd_Disposed);
  }
  
  void testHwnd_Disposed(object sender, EventArgs e) {
  this.Shutdown();
  }
  }
  
  

• DOlmsted

  still don't get it. Can somebody guide me through it
  
  

• daz1

  It's a single window app. but when it debugs, the window is there (can see this in the taskbar), but there nothing to see
  
  

• Teppei

  Hi,

  A few words of advice on this.

  it will only work with single window applications and not applications that use NavigationWindow or mutiple window containers. The reason for this is pixel ownership, when you set opactity on window its for that window while window containers sit at a level below that and can't channel opacity into any windows within it. For this to work I suspect would need a big change to the API that won't happen in the v1 timeframe (but who's to say it won't make it into the v2 timeframe). So in general for opque windows to work you will need a single window.

  HTH

  Andy

  
  
• Using per-pixel opacity and there's nothing to see