quartz-graphics

I am trying to trap keypresses using a CGEventTapCreate etc in Swift. I want to do this so that when my toddler is using a program the Mac, I can limit which keys do something. I appreciate that I need to enable assistive technology to get CGEventTap to work I am having trouble understanding what I need to do in Swift to get the final parameter in the call. Essentially, I do not understand part of the documentation at quartz event documentation Specifically the final parameter which is described by refcon: A pointer to user-defined data. This pointer is passed into the callback function

I'm creating an image offscreen using a context from CGBitmapContextCreate() . While drawing text, I tried to use the: CGContextSetTextMatrix(contextRef, CGAffineTransformMake(1.0, 0.0, 0.0, -1.0, 0.0, 0.0)); but my text was still upside down. If I used the standard transforms it was correct: CGContextTranslateCTM(contextRef, 0.0, contextRect.size.height); CGContextScaleCTM(contextRef, 1.0, -1.0); My question is should the CGContextSetTextMatrix work for an offscreen bitmap? Maybe I was doing something wrong. No. The text matrix, as its name says, only affects text. All drawing goes through

Does anyone have an example of how to draw the blue "unread dot" used in Apple's Mail App? This one in specific: Drawing an ellipse is straight forward with Quartz2d, but the subtle use of shadows+gradients make this look really 3d. I think the blue dot in mail is actually an image; I would imagine that blitting an image would be faster than drawing a gradient. If you decide to go with a resource there is an app called UIKit-Artwork-Extractor that allows you to rip all the resources from all the IOS apps you have installed https://github.com/0xced/UIKit-Artwork-Extractor 来源： https:/

I created a masked image using a function form an iphone blog: UIImage *imgToSave = [self maskImage:[UIImage imageNamed:@"pic.jpg"] withMask:[UIImage imageNamed:@"sd-face-mask.png"]]; Looks good in a UIImageView UIImageView *imgView = [[UIImageView alloc] initWithImage:imgToSave]; imgView.center = CGPointMake(160.0f, 140.0f); [self.view addSubview:imgView]; UIImagePNGRepresentation to save to disk : [UIImagePNGRepresentation(imgToSave) writeToFile:[self findUniqueSavePath] atomically:YES]; UIImagePNGRepresentation returns NSData of an image that looks different. The output is inverse image

I'm trying to draw some shadows in a rect. The shadow image itself is about 1px * 26px. Here's two methods I've thought of for drawing the image in the view: //These methods are called in drawRect: /* Method 1 */ [self.upperShadow drawInRect:rectHigh]; //upperShadow is UIImage [self.lowerShadow drawInRect:rectLow]; /* Method 2 */ CALayer *shadowTop = [CALayer layer]; shadowTop.frame = rectHigh; shadowTop.contents = (__bridge id)topShadow; //topShadow is CGImage [self.layer addSublayer:shadowTop]; CALayer *shadowLow = [CALayer layer]; shadowLow.frame = rectLow; shadowLow.contents = (__bridge id

Just wondering if there is a way to receive a callback in Cocoa if Magic Mouse or Trackpad is being touched by the user? I looked into Quartz Events, but it seems I can only get callbacks if the mouse is moving or clicked etc. Note that I want to receive a callback even if my app is not active. It's a background utility app. Also, it can't use private frameworks as it's going to be a Mac App Store app. alecail You could use this code to trap the events: (create a new Cocoa application and put this in the application delegate) NSEventMask eventMask = NSEventMaskGesture | NSEventMaskMagnify |

How does z-ordering work with sibling NSViews in Cocoa? I'm confused because I'm finding conflicting sources of information in Apple's docs and APIs. (Note: Subviews are obviously rendered on top of its parent view, I am talking explicitly about sibling views here). Hypothesis A : "Yes, you can define the z-order of sibling NSViews " In IB you can place views on top of each other and they will always be composited in the way you'd expect. There's buttons in Xcode under the Editor menu named "Send to Back", "Send Forward" etc. The NSView also has a method named - (void)addSubview:(NSView *