Yes, -cacheDisplayInRect:toBitmapImageRep: is going to end up calling drawRect:. It's not meant to be invoked _from_ drawRect:.
You can call that from another view, or from a controller, or whatever. -Ken On Fri, Oct 24, 2008 at 5:07 PM, Randall Meadows <[EMAIL PROTECTED]> wrote: > On Oct 23, 2008, at 9:11 PM, Ken Ferry wrote: >> >> Last, you might be interested in -[NSView >> cacheDisplayInRect:toBitmapImageRep:] as an alternate way of accomplishing >> the end goal. Take a gander at the 10.4 AppKit release notes, that have an >> explanatory section on this method. Search for "NSView Drawing Redirection >> API" at >> <http://developer.apple.com/releasenotes/Cocoa/AppKitOlderNotes.html>. > > OK, I thought this was what I wanted, but I seem to be having a problem that > I don't fully understand. > > I have 2 views, "viewToReflect", and "reflectionView" (which shows the > reflection of viewToReflect), both subclasses of NSView. In each class, I > have an outlet to the other. In reflectionView, I have an NSBitmapImageRep* > ("reflectedImage") member. > > When viewToReflect gets redrawn, I tell reflectionView that it needs to > update itself: > > [reflectionView setNeedsDisplay]; > > In reflectionView's -drawRect:, I create the NSBitmapImageRep instance and I > initialize it as those release notes state: > > reflectedImage = [viewToReflect > bitmapImageRepForCachingDisplayInRect:[viewToReflect bounds]]; > NSGraphicsContext *bitmapGraphicsContext = [NSGraphicsContext > graphicsContextWithBitmapImageRep:reflectedImage]; > [NSGraphicsContext saveGraphicsState]; > [NSGraphicsContext setCurrentContext:bitmapGraphicsContext]; > [[NSColor clearColor] set]; > NSRectFill(NSMakeRect(0, 0, [reflectedImage size].width, [reflectedImage > size].height)); > [NSGraphicsContext restoreGraphicsState]; > > and then I call > > [viewToReflect cacheDisplayInRect:[viewToReflect bounds] > toBitmapImageRep:reflectedImage]; > > This causes a recursion cycle to start; upon calling this > cacheDisplayInRect:... method, I ended up being put back at the top of > reflectionView's -drawRect:, even though it's viewToReflect that should be > getting redrawn. I assumed I would go back through the viewToReflect's > -drawRect, but that is not happening (I have a breakpoint there, and it's > not getting hit after this call, while the reflectionView's -drawRect: > breakpoint IS getting hit). Here's a stack trace snippet: > > ...repeat lines 15-19 ad infinitum (as long as I keep continuing) > #15 0x0002a8b8 in -[CardReflectionView drawRect:] at CardReflectionView.m:29 > #16 0x903e2eb2 in -[NSView(NSInternal) > _recursive:displayRectIgnoringOpacity:inContext:topView:] > #17 0x903e324a in -[NSView(NSInternal) > _recursive:displayRectIgnoringOpacity:inContext:topView:] > #18 0x903e27db in -[NSView displayRectIgnoringOpacity:inContext:] > #19 0x90489c0c in -[NSView cacheDisplayInRect:toBitmapImageRep:] > #20 0x0002a8b8 in -[CardReflectionView drawRect:] at CardReflectionView.m:29 > #21 0x903e2eb2 in -[NSView(NSInternal) > _recursive:displayRectIgnoringOpacity:inContext:topView:] > #22 0x903e324a in -[NSView(NSInternal) > _recursive:displayRectIgnoringOpacity:inContext:topView:] > #23 0x903e27db in -[NSView displayRectIgnoringOpacity:inContext:] > #24 0x90489c0c in -[NSView cacheDisplayInRect:toBitmapImageRep:] > #25 0x0002a8b8 in -[CardReflectionView drawRect:] at CardReflectionView.m:29 > #26 0x90399984 in -[NSView _drawRect:clip:] > > cacheDisplayInRect:... sure seemed like what I want to do, and going over it > again (and again, and again...) it sure seems logical, but obviously I'm > missing something rather important. Anyone care to point what exactly what > that might be to me? > > Thanks! > randy > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
