Using CALayer's renderInContext: method with geometryFlipped
I have a CALayer (containerLayer) that I'm looking to convert to a
NSBitmapImageRep before saving the data out as a flat file. containerLayer
has its geometryFlipped property set to YES, and this seems to be causing
issues. The PNG file that is ultimately generated renders the content
correctly, but doesn't seem to takes the flipped geometry into account. I'm
obviously looking for test.png to accurately represent the content shown to
the left.
For reference,here's a screenshot of the issue:
http://i.stack.imgur.com/VasZH.png. You'll see containerLayer on the left
and the generated .png file on the right.
- (NSBitmapImageRep *)exportToImageRep
{
CGContextRef context = NULL;
CGColorSpaceRef colorSpace;
int bitmapByteCount;
int bitmapBytesPerRow;
int pixelsHigh = (int)[[self containerLayer] bounds].size.height;
int pixelsWide = (int)[[self containerLayer] bounds].size.width;
bitmapBytesPerRow = (pixelsWide * 4);
bitmapByteCount = (bitmapBytesPerRow * pixelsHigh);
colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
context = CGBitmapContextCreate (NULL,
pixelsWide,
pixelsHigh,
8,
bitmapBytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedLast);
if (context == NULL)
{
NSLog(@Failed to create context.);
return nil;
}
CGColorSpaceRelease(colorSpace);
[[[self containerLayer] presentationLayer] renderInContext:context];
CGImageRef img = CGBitmapContextCreateImage(context);
NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc]
initWithCGImage:img];
CFRelease(img);
return bitmap;
}
For reference, here's the code that actually saves out the generated
NSBitmapImageRep:
NSData *imageData = [imageRep representationUsingType:NSPNGFileType
properties:nil];
[imageData writeToFile:@test.png atomically:NO];
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NSImage mouse events
I have a number of NSImages that I'm rendering in a custom NSView subclass. I'm looking to enlarge theses images as and when the user places their mouse over them and am wondering about the best way to go about doing this. Currently I'm using the NSView's drawRect: method to composite the images, but also free to render them via NSImageView instances, if that will make things easier. My initial instinct was to setup NSTrackingArea's for each NSImage instance but wanted to ensure I wasn't missing something obvious. ___ 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 arch...@mail-archive.com
Problems with tearing down an NSStatusItem menu
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Binding CoreData Managed Object to NSTextFieldCell subclass
I have an NSTableView which has its first column set to contain a custom NSTextFieldCell. My custom NSTextFieldCell needs to allow the user to edit a desc property within my Managed Object but to also display an info string that it contains (which is not editable). To achieve this, I followed this tutorial ( http://www.timisted.net/blog/archive/custom-cells-and-core-data/). In a nutshell, the tutorial suggests editing your Managed Objects generated subclass to create and pass a dictionary of its contents to your NSTableColumn via bindings. This works well for read-only NSCell implementations, but I'm looking to subclass NSTextFieldCell to allow the user to edit the desc property of my Managed Object. To do this, I followed one of the articles comments, which suggests subclassing NSFormatter to explicitly state which Managed Object property you would like the NSTextFieldCell to edit. I've posted the code of my NSFormatter subclass here (http://pastebin.org/257930) for reference. This seems to work, but is extremely patch. On occasion, clicking to edit a row will cause its value to nullify. On other occasions, the value you enter on one row will populate other rows within the table. I've been doing a lot of reading on this subject and would really like to get to the bottom of this. What's more frustrating is that my NSTextFieldCell is rendering exactly how I would like it to. This editing issue is my last obstacle! If anyone can help, that would be greatly appreciated. ___ 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 arch...@mail-archive.com
