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Incorrect flipping when manually drawing NSCells (was: Fwd: -isFlipped not working right when drawing IconAndTextCell to NSImage)

Subject: Incorrect flipping when manually drawing NSCells (was: Fwd: -isFlipped not working right when drawing IconAndTextCell to NSImage)
From: "Lawrence Sanbourne" <email@hidden>
Date: Sat, 29 Apr 2006 17:47:22 -0500
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Hello again,

After some more testing, I've determined that this also happens with
other NSCells besides IconAndTextCell. In particular, I get the same
behavior with a custom cell I wrote myself. (It's viewed in an
NSMatrix subclass.)

So, what am I doing wrong when I try to draw NSCells to images?

	// Draw cell in cellImage.
	BOOL highlighted = [cell isHighlighted];
	[cell setHighlighted:NO];

	[cellImage lockFocus];
	[cell drawWithFrame:cellDrawingFrame inView:self]; // self is the
NSControl containing the cell
	[cellImage unlockFocus];
	[cell setHighlighted:highlighted];

Somehow, if the cell draws text, it comes out OK. But if the cell
draws images, they come out flipped.

Does this help? Any ideas?

Larry

---------- Forwarded message ----------
From: Lawrence Sanbourne <email@hidden>
Date: Apr 28, 2006 8:13 PM
Subject: -isFlipped not working right when drawing IconAndTextCell to NSImage
To: Apple Mailing List <email@hidden>


Hello,

I'm fairly new to Cocoa drawing, and I'm having a problem with
-isFlipped that I haven't been able to figure out. From a subclass of
NSTableView, I'm drawing one of the table's IconAndTextCell objects
into an NSImage to create a custom drag image:

- (NSImage *)dragImageForRowsWithIndexes:(NSIndexSet *)dragRows
tableColumns:(NSArray *)tableColumns event:(NSEvent *)dragEvent
offset:(NSPointPointer)dragImageOffset {
//...
               [dragImage lockFocus];
               [cell drawWithFrame:cellDrawingFrame inView:self];
               [dragImage unlockFocus];
//...
return dragImage;
}

IconAndTextCell is careful to check the -isFlipped status of its
controlView. However, this is causing the icon in the cell to draw in
the wrong place. If I negate the conditional on the if([controlView
isFlipped]) in IconAndTextCell, the problem is fixed for drag images
-- but then of course all the other IconAndTextCells look weird.

What am I doing wrong?

Larry
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Follow-Ups:
- Re: Incorrect flipping when manually drawing NSCells (was: Fwd: -isFlipped not working right when drawing IconAndTextCell to NSImage)
  - From: Scott Anguish <email@hidden>
- [SOLVED] Fwd: Incorrect flipping when manually drawing NSCells (was: Fwd: -isFlipped not working right when drawing IconAndTextCell to NSImage)
  - From: "Lawrence Sanbourne" <email@hidden>

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