[SOLVED] Fwd: Incorrect flipping when manually drawing NSCells (was: Fwd: -isFlipped not working right when drawing IconAndTextCell to NSImage)
[SOLVED] Fwd: Incorrect flipping when manually drawing NSCells (was: Fwd: -isFlipped not working right when drawing IconAndTextCell to NSImage)
- Subject: [SOLVED] Fwd: 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 23:24:07 -0500
Solved! To create the drag image, I was having the cell draw to an
intermediate image (cellImage) and then compositing the intermediate
image to a final image at 50% opacity. This fixed the problem:
[cellImage setFlipped:[self isFlipped]];
Larry
---------- Forwarded message ----------
From: Lawrence Sanbourne <email@hidden>
Date: Apr 29, 2006 5:47 PM
Subject: Incorrect flipping when manually drawing NSCells (was: Fwd:
-isFlipped not working right when drawing IconAndTextCell to NSImage)
To: Apple Mailing List <email@hidden>
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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