Re: window shadow and setAlphaValue bug?
Re: window shadow and setAlphaValue bug?
- Subject: Re: window shadow and setAlphaValue bug?
- From: Ivan Kourtev <email@hidden>
- Date: Sun, 19 Nov 2006 21:39:58 -0500
I am running 10.4.8 on a PPC (G5) and am creating a regular window
with NStitledWindowMask.
You're right, your code doesn't exhibit the behavior I described -- I
think it is because you set the alpha Value in the initializer. If
you set the alpha value after the window is up it does the same thing
- shows a shadow.
This is what I was doing for my little experiment:
1. Start a new project type Cocoa Application
2. Open the MainMenu.nib and delete the window
3. Create a subclass AppController of NSObject
4. Instantiate AppController
5. Make it the delegate of the app (File's Owner)
6. Create the files for AppController
7. Add the following method to AppController.m
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
NSWindow *window = [[NSWindow alloc] initWithContentRect:NSMakeRect
(100,100,600,600)
styleMask:NSTitledWindowMask
backing:NSBackingStoreBuffered
defer:YES];
[window setHasShadow:NO];
[window orderFront:self];
[window setAlphaValue:0.75];
}
I need to set the alpha value dynamically after the window is up --
this is how I discovered the shadow effect.
--
ivan
On Nov 19, 2006, at 8:05 PM, Ricky Sharp wrote:
On Nov 19, 2006, at 3:11 PM, Ivan Kourtev wrote:
Why is it that if a window has NO shadow and the window's alpha
value is set (via - [NSWindow setAlphaValue:]) to a value
different from 1.0, a window shadow is now rendered to the
screen? I tried creating the window programmatically or in IB, I
tried invalidateShadow after the setAlphaValue calls, nothing works.
What's even more confusing to me is that - [NSWindow hasShadow]
continues to return NO after the shadow has appeared.
I searched all window documentation and didn't find any mention of
this being documented behavior. Is anyone aware of why this is
happening and any possible workarounds (setting alpha back to 1.0
helps to eliminate the shadow but I really need windows with
different alpha values).
What kind of window are you creating? And what OS are you running?
I was not able to reproduce this on 10.4.8. From my NSWindow
subclass' designated initializer:
if ((self = [super initWithContentRect:theContentRect
styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered
defer:NO]) != nil)
{
[self setBackgroundColor:[NSColor blackColor]];
[self setHidesOnDeactivate:NO];
[self setReleasedWhenClosed:NO];
[self setMovableByWindowBackground:NO];
[self setHasShadow:NO];
[self useOptimizedDrawing:YES];
[self setOpaque:NO];
[self setAlphaValue:0.1];
}
___________________________________________________________
Ricky A. Sharp mailto:email@hidden
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