@interface HostView : NSView {
  NSView *_docView;
  CGFloat _scale;
}

@property (assign) CGFloat scale;

@end



@implementation HostView

@synthesize scale=_scale;

- (void)updateFrame {
  NSRect frame = _docView.frame;
  frame.size.width = frame.size.width * _scale;
  frame.size.height = frame.size.height * _scale;
  self.frame = frame;
}

- (void)setScale:(CGFloat)f {
  _scale = f;
  [docView scaleUnitSquareToSize:NSMakeSize(_scale, _scale)];
  [self updateFrame];
}

- (void)documentFrameChanged:(NSNotification *)n {
  [self updateFrame];
}

- (void)initWithDocumentView:(NSView *)docView {
  _scale = 1.0;
  _docView = [docView retain];
  
  [self addSubview:_docView];
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(documentFrameChanged:) name:NSViewFrameDidChangeNotification object:_docView];
  
  [self updateFrame];
}

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

@end