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NSTextView subclass redrawing weirdness
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NSTextView subclass redrawing weirdness


  • Subject: NSTextView subclass redrawing weirdness
  • From: "John Cassington" <email@hidden>
  • Date: Sun, 9 Jul 2006 11:07:13 +1000

Hi everyone,
I have created a subclass of on NSTextView so that I can add a 1 pixel
border around the edge of it. This is working, but it seems to be getting
darker every time i do something that causes a redraw (such as hitting
enter).

For example, I type a line of text during which the border remains normal,
but when i hit enter the area of the border which lines up with the previous
line goes one shade darker.

The only reason i can think for this happening is that i am not using
NSView's drawing methods properly.

Here is my code:

<< BEGIN CODE >>

- (id)initWithFrame:(NSRect)frameRect
{
   if ((self = [super initWithFrame:frameRect]) != nil) {
       [self setBackgroundColor:[NSColor whiteColor]];
       [self setAllowsUndo:YES];
       [self setVerticallyResizable:NO];
   }
   return self;
}

-(void)drawRect:(NSRect)rect {
   NSRect wholeRect = [self bounds];
   NSRect textRect = NSMakeRect(wholeRect.origin.x+1,wholeRect.origin.y+1,
wholeRect.size.width-2,wholeRect.size.height-2);

   [[NSColor blackColor] set];
   [NSBezierPath setDefaultLineWidth:1];
   [NSBezierPath strokeRect:wholeRect];

   [super drawRect:textRect];
}

<< END CODE >>

I hope that somebody will be able to help me, because i am not too sure
about on screen drawing.

Thanks,
John Cassington
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  • Follow-Ups:
    • Re: NSTextView subclass redrawing weirdness
      • From: Antonio Nunes <email@hidden>
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