Re: Drawing a view inside an image
Re: Drawing a view inside an image
- Subject: Re: Drawing a view inside an image
- From: Olivier <email@hidden>
- Date: Tue, 10 Dec 2002 10:10:44 -0600
You need to have the view inside a window to be able to focus the view.
I'm trying to do exactely the same thing as you are.
I put my progress indicator in window that i created programatically.
that create an image, but that image does not contain the progress
indicator...
windowContainingIndicator = [[NSWindow alloc]
initWithContentRect: NSMakeRect(0, 0, 100, 100)
styleMask: NSBorderlessWindowMask
backing: NSBackingStoreNonretained
defer: NO];
indicator = [[NSProgressIndicator alloc] initWithFrame:
NSMakeRect(0, 0, 16, 16)];
[[windowContainingIndicator contentView] addSubview: indicator];
[indicator setDoubleValue: 0];
[indicator setMinValue: 0];
[indicator setMaxValue: 100];
the style of the progress indicator is set somewhere else, and i make
sure to set is display when stopped to YES, but no luck yet, let me
know if you find a solution
olivier
On Monday, December 9, 2002, at 08:39 PM, Simone Manganelli wrote:
>
I was using init, and then I was using the setFrame: method
>
immediately after, but apparently it still didn't work.
>
>
I tried to modify my code to use the method you used below, but now
>
I'm getting some uncaught exceptions. Here's the new code:
>
>
NSProgressIndicator *theProgressIndicator;
>
NSBitmapImageRep *rep;
>
NSImage *theNewImage = [[NSImage alloc]
>
initWithSize:NSMakeSize(60,12)];
>
NSRect theRect = NSMakeRect(0,0,60,12);
>
[theProgBarImage release];
>
theProgressIndicator = [[NSProgressIndicator alloc]
>
initWithFrame:theRect];
>
[theProgressIndicator setIndeterminate:NO];
>
[theProgressIndicator setMaxValue:[theMaxValue doubleValue]];
>
[theProgressIndicator setDoubleValue:[memUsage doubleValue]];
>
[theProgressIndicator stopAnimation:nil];
>
[theProgressIndicator lockFocus];
>
rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:theRect];
>
[theProgressIndicator unlockFocus];
>
[theNewImage addRepresentation:rep];
>
[rep release];
>
[theProgressIndicator release];
>
theProgBarImage = theNewImage;
>
>
I'm getting this set of errors:
>
>
2002-12-09 18:34:15.881 MyApp[18892] *** Assertion failure in
>
-[NSProgressIndicator lockFocus], AppKit.subproj/NSView.m:2343
>
2002-12-09 18:34:15.885 MyApp[18892] An uncaught exception was raised
>
2002-12-09 18:34:15.895 MyApp[18892] lockFocus sent to a view whose
>
window is deferred and does not yet have a corresponding platform
>
window
>
2002-12-09 18:34:15.895 MyApp[18892] *** Uncaught exception:
>
<NSInternalInconsistencyException> lockFocus sent to a view whose
>
window is deferred and does not yet have a corresponding platform
>
window
>
>
MyApp has exited due to signal 5 (SIGTRAP).
>
>
Any help?
>
>
-- Simone Manganelli
>
>
On Monday, Dec 9, 2002, at 16:58 US/Pacific, John C. Randolph wrote:
>
>
>
>
> On Monday, December 9, 2002, at 01:12 PM, Simone Manganelli wrote:
>
>
>
>> How would one go about drawing the image of an NSView into an
>
>> NSImage? Specifically, I want to draw what a specific
>
>> NSProgressIndicator looks like into a specific NSImage, which I then
>
>> want to use in my program. How would one go about doing that? I've
>
>> tried it using this code:
>
>>
>
>> NSProgressIndicator *theProgressIndicator;
>
>> NSImage *theProgBarImage = [[NSImage alloc]
>
>> initWithSize:NSMakeSize(60,12)];
>
>> NSRect theRect = NSMakeRect(0,0,60,12);
>
>> [theProgBarImage lockFocus];
>
>> theProgressIndicator = [[NSProgressIndicator alloc] init];
>
>
>
> [snippage]
>
>
>
>>
>
>> However, it doesn't seem to work. What am I doing wrong?
>
>
>
> You're calling -init, instead of -initWithFrame: when you create your
>
> progress indicator. The designated initializer for any NSView
>
> subclass is -initWithFrame. The effect of this is that the progress
>
> indicator never created the cell it should use to draw its contents.
>
>
>
> BTW, I wrote a category of NSImage a while ago that does this:
>
>
>
> @implementation NSView (snapshot)
>
>
>
> - (NSImage *) snapshot { return [self snapshotFromRect:[self
>
> bounds]]; }
>
> - (NSImage *) snapshotFromRect:(NSRect) sourceRect;
>
> /*"This method creates a new image from a portion of the receiveing
>
> view. The image is returned autoreleased."*/
>
> {
>
> NSImage
>
> *snapshot = [[NSImage alloc] initWithSize:sourceRect.size];
>
>
>
> NSBitmapImageRep
>
> *rep;
>
>
>
> [self lockFocus];
>
> rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:sourceRect];
>
> [self unlockFocus];
>
>
>
> [snapshot addRepresentation:rep];
>
> [rep release];
>
> return [snapshot autorelease]; // balance the +alloc call..
>
> }
>
>
>
> @end
>
>
>
>
>
> It's part of the "Color Sampler" example, available at:
>
>
>
> http://developer.apple.com/samplecode/Sample_Code/Cocoa/
>
> Color_Sampler.htm
>
>
>
> -jcr
>
>
>
> John C. Randolph <email@hidden> (408) 974-8819
>
> Sr. Cocoa Software Engineer,
>
> Apple Worldwide Developer Relations
>
> http://developer.apple.com/cocoa/index.html
>
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