third_party/apple_sample_code/ImageAndTextCell.m

/*
 File: ImageAndTextCell.m
 Abstract: Subclass of NSTextFieldCell which can display text and an image simultaneously.
 Version: 1.0

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 */

#import "ImageAndTextCell.h"
#import <AppKit/NSCell.h>

#if !defined(MAC_OS_X_VERSION_10_10) || \
    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_10
typedef NSUInteger NSCellHitResult;
#endif

@implementation ImageAndTextCell

@synthesize image;

- (id)init {
  if ((self = [super init])) {
    [self setLineBreakMode:NSLineBreakByTruncatingTail];
    [self setSelectable:YES];
  }
  return self;
}

- (void)dealloc {
  [image release];
  [super dealloc];
}

- (id)copyWithZone:(NSZone *)zone {
  ImageAndTextCell *cell = (ImageAndTextCell *)[super copyWithZone:zone];
  // The image ivar will be directly copied; we need to retain or copy it.
  cell->image = [image retain];
  return cell;
}

- (NSRect)imageRectForBounds:(NSRect)cellFrame {
  NSRect result;
  if (image != nil) {
    result.size = [image size];
    result.origin = cellFrame.origin;
    result.origin.x += 3;
    result.origin.y += ceil((cellFrame.size.height - result.size.height) / 2);
  } else {
    result = NSZeroRect;
  }
  return result;
}

// We could manually implement expansionFrameWithFrame:inView: and drawWithExpansionFrame:inView: or just properly implement titleRectForBounds to get expansion tooltips to automatically work for us
- (NSRect)titleRectForBounds:(NSRect)cellFrame {
  NSRect result;
  if (image != nil) {
    CGFloat imageWidth = [image size].width;
    result = cellFrame;
    result.origin.x += (3 + imageWidth);
    result.size.width -= (3 + imageWidth);
  } else {
    result = [super titleRectForBounds:cellFrame];
  }
  return result;
}

- (void)editWithFrame:(NSRect)aRect inView:(NSView *)controlView editor:(NSText *)textObj delegate:(id)anObject event:(NSEvent *)theEvent {
  NSRect textFrame, imageFrame;
  NSDivideRect (aRect, &imageFrame, &textFrame, 3 + [image size].width, NSMinXEdge);
  [super editWithFrame: textFrame inView: controlView editor:textObj delegate:anObject event: theEvent];
}

- (void)selectWithFrame:(NSRect)aRect inView:(NSView *)controlView editor:(NSText *)textObj delegate:(id)anObject start:(NSInteger)selStart length:(NSInteger)selLength {
  NSRect textFrame, imageFrame;
  NSDivideRect (aRect, &imageFrame, &textFrame, 3 + [image size].width, NSMinXEdge);
  [super selectWithFrame: textFrame inView: controlView editor:textObj delegate:anObject start:selStart length:selLength];
}

- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {
  if (image != nil) {
    NSRect imageFrame;
    NSSize imageSize = [image size];
    NSDivideRect(cellFrame, &imageFrame, &cellFrame, 3 + imageSize.width, NSMinXEdge);
    if ([self drawsBackground]) {
      [[self backgroundColor] set];
      NSRectFill(imageFrame);
    }
    imageFrame.origin.x += 3;
    imageFrame.origin.y += ceil((cellFrame.size.height - imageSize.height) / 2);
    imageFrame.size = imageSize;

    [image drawInRect:imageFrame
             fromRect:NSZeroRect
            operation:NSCompositeSourceOver
             fraction:1.0
       respectFlipped:YES
                hints:nil];
  }
  [super drawWithFrame:cellFrame inView:controlView];
}

- (NSSize)cellSize {
  NSSize cellSize = [super cellSize];
  if (image != nil) {
    cellSize.width += [image size].width;
  }
  cellSize.width += 3;
  return cellSize;
}

- (NSCellHitResult)hitTestForEvent:(NSEvent *)event inRect:(NSRect)cellFrame ofView:(NSView *)controlView {
  NSPoint point = [controlView convertPoint:[event locationInWindow] fromView:nil];
  // If we have an image, we need to see if the user clicked on the image portion.
  if (image != nil) {
    // This code closely mimics drawWithFrame:inView:
    NSSize imageSize = [image size];
    NSRect imageFrame;
    NSDivideRect(cellFrame, &imageFrame, &cellFrame, 3 + imageSize.width, NSMinXEdge);

    imageFrame.origin.x += 3;
    imageFrame.size = imageSize;
    // If the point is in the image rect, then it is a content hit
    if (NSMouseInRect(point, imageFrame, [controlView isFlipped])) {
      // We consider this just a content area. It is not trackable, nor it it editable text. If it was, we would or in the additional items.
      // By returning the correct parts, we allow NSTableView to correctly begin an edit when the text portion is clicked on.
      return NSCellHitContentArea;
    }
  }
  // At this point, the cellFrame has been modified to exclude the portion for the image. Let the superclass handle the hit testing at this point.
  return [super hitTestForEvent:event inRect:cellFrame ofView:controlView];
}


@end