Re: Transparent sheets in Snow Leopard

On Sep 19, 2009, at 5:40 AM, Trent Jacobs wrote:

> Hi all,
>
> I've written an application where I have a transparent sheet showing  
> over a window. I use this to show text (or other things as well)  
> over either a background image or a video.
>
> To make the background of the sheet transparent I sublcassed  
> NSWindow and used the following:
>
> / 
> *******************************************************************************
> * Function:    initWithContentRect
> *
> * Returns:     id of transparent window
> *
> * Description: Sets up the values to make the window transparent
> *
> ******************************************************************************/
> - (id) initWithContentRect : (NSRect) contentRect
> 				 styleMask : (unsigned int) aStyle
> 				   backing : (NSBackingStoreType) bufferingType
> 					 defer : (BOOL) flag
> {
>    NSWindow* result = [super initWithContentRect : contentRect
> 										styleMask : NSBorderlessWindowMask
> 										  backing : NSBackingStoreBuffered
> 											defer : NO];
>    [result setBackgroundColor: [NSColor clearColor]];
>    [result setLevel: NSStatusWindowLevel];
>    [result setAlphaValue:1.0];
>    [result setOpaque:NO];
>    [result setHasShadow: NO];
>    return result;
> }
>
> This has always worked for me, but now when the sheet is showing,  
> the area covered by the transparent sheet is blurred. I've uploaded  
> a screenshot to http://www.jacobs.co.za/BlurredSheet.png
>
> I've recently upgraded to snow leopard and I don't remember this  
> happening in tiger or leopard, but that may just be a coincidence.
>
> Can anyone help me out? Thanks in advance!

This is behaving correctly in SnowLeopard.  Sheets have a blurred  
background behind them by default now.  You will want to create the  
window the same way and attach it using other methods than as a sheet  
(Which I suggest anyway give the HI you are showing.  There is no need  
to use a sheet - an attached window would do just fine).  (See  
NSWindow.h - addChildWindow:ordered:).

Eric

>
> Trent.
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