Getting NSImage from NSProgressIndicator

Question

I need to put an image from NSProgressIndicator in an NSOutlineView cell. I wrote code that does this for a specific indicator, and it works great:

NSProgressIndicator *progressIndicator = [[NSProgressIndicator alloc] initWithFrame:NSMakeRect(0, 0, 16, 16)];
[progressIndicator setStyle:NSProgressIndicatorSpinningStyle];          
[progressIndicator setIndeterminate:NO];
[progressIndicator setMaxValue:100.0];
[progressIndicator setDoubleValue:somePercentage];          

NSImage *updateImage = [[NSImage alloc] initWithData:[progressIndicator dataWithPDFInsideRect:[progressIndicator frame]]];
[progressIndicator release];


return [updateImage autorelease];

I tried to change the code to also give me vague indicator images. However, for an uncertain case, I always get a blank 16x16 image. (I confirmed this by writing the image to a file in each case, a certain case gives me an image of a progress indicator, an undefined case is always 16x16 white square).

Modified Code:

if(self.lengthUnknown)
{
    NSProgressIndicator *progressIndicator = [[NSProgressIndicator alloc] initWithFrame:NSMakeRect(0, 0, 16, 16)];
    [progressIndicator setStyle:NSProgressIndicatorSpinningStyle];          
    [progressIndicator setIndeterminate:YES];

    NSImage *updateImage = [[NSImage alloc] initWithData:[progressIndicator dataWithPDFInsideRect:[progressIndicator frame]]];
    [progressIndicator release];


    return [updateImage autorelease];
}
else
{
 // Same code as the first listing, this case works fine
}

Undefined progress indicators use some type of drawing that calls -dataWithPDFInsideRect: can't capture their image?

---

: , , NSImage lockFocus, , .

, (AMIndeterminateProgressIndicatorCell) - , , , .

Answer 1

AMIndeterminateProgressIndicatorCell . NSProgressIndicator, , , IMO.

_{(: .)}

Answer 2

, , - , , . setUsesThreadedAnimation: , , , .

NSImage, drawRect: . :

NSProgressIndicator* progressIndicator;
NSImage* image = [[NSImage alloc] initWithSize:[progressIndicator bounds].size];
[image lockFocus];
[progressIndicator drawRect:[progressIndicator bounds]];
[image unlockFocus];