Re: Strange NSView redraw problem

• Subject: Re: Strange NSView redraw problem
• From: Ricky Sharp <email@hidden>
• Date: Sat, 30 Sep 2006 09:32:12 -0500
• Delivered-to: email@hidden
• Delivered-to: email@hidden

On Sep 30, 2006, at 12:39 AM, John Cassington wrote:

Hello,
I have a nsview class which is used more than once at a time. the view
can be 'selected' in that its background color can change based on a
boolean value.

when i change the 'selection' from view to view, the nsbezierpath used
to draw the curved border around the view does not clear properly.

here are two example images:
before: http://img88.imageshack.us/img88/7259/ beforemultipleredrawsvc7.png
after: http://img136.imageshack.us/img136/3713/ aftermultipleredrawsrz9.png

i think this has something to do with anti-aliasing, but i am not sure.

i am using the following three lines to try and clear the view before a redraw:

NSEraseRect([self frame]);
[[NSColor clearColor] set];
NSRectFill([self frame]);

- (BOOL)isOpaque
{
    return NO;
}

Or, simply leave out isOpaque as by default, NSView returns NO.

___________________________________________________________
Ricky A. Sharp         mailto:email@hidden
Instant Interactive(tm)   http://www.instantinteractive.com

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