Re: [SOLVED] Scrolling behavior ala Preview

FROM : I. Savant
DATE : Thu Jul 20 15:05:55 2006

There's also this: http://www.cocoadev.com/index.pl?
CenteringInsideNSScrollView

--
I.S.


On Jul 20, 2006, at 9:04 AM, David Hoerl wrote:

> [for the archives]
>
> The way to get Preview style "scrolling" of images, where images 
> that are smaller than the visible rectangle get centered in the 
> visible rect is as follows:
>
> - in your CustomeView drawRect method, look to see if the actual 
> image rectangle is smaller than the visibleRect of the superview 
> (which is of course the contentView).
>
> - if so, for that axis only, expand the frameRect of the 
> CustomeView to fit size of that axis of the visibleRect. Save the 
> old frameRect.
>
> - use either a NSAffineTransform, or change the origin of the 
> boundRect, so that the undrawn space will be evenly split on either 
> side of the image.
>
> - draw the image
>
> - restore the original frameRect.
>
> [Note - may be better ways to do this, but this way works.]
>
> David
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