On 28 Sep 2013, at 12:21, Quincey Morris <quinceymor...@rivergatesoftware.com>
wrote:
> On Sep 27, 2013, at 22:05 , "Gerriet M. Denkmann" <gerr...@mdenkmann.de>
> wrote:
>
>> The backtrace does offer me no clues:
>>
>> #1: 0x00007fff8d0f2140 AppKit`-[NSView _drawRect:clip:] + 4437
>> #2: 0x00007fff8d0eefb3 AppKit`-[NSView
>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
>> + 3058
>> #3: 0x00007fff8d0efa44 AppKit`-[NSView
>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
>> + 5763
>> #4: 0x00007fff8d0efa44 AppKit`-[NSView
>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
>> + 5763
>> #5: 0x00007fff8d0efa44 AppKit`-[NSView
>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
>> + 5763
>> #6: 0x00007fff8d0efa44 AppKit`-[NSView
>> _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:]
>> + 5763
>
> The backtrace does in fact offer clues. Your view needs redrawing, and the
> frameworks are breaking down the dirty region into non-overlapping component
> rects that are drawn separately. It just happens that this decomposition
> process leaves a tiny rect to be drawn separately.
>
> As to why it decomposes this way, my guess would be that your view has
> subviews (and/or controls) which are misaligned by a single pixel,
My CustomView (aka DriftView) has no subviews at all. It only has a superview:
the ScrollView.
> changing what would otherwise be a nice rectangular dirty region into
> something slightly more complex.
Well, then this should always happen, shouldn't it?
But I just get:
-[DriftView drawRect:] nice rect {{0, 0}, {1393, 189}}; visibleRect
{{0, 0}, {1393, 189}}
whenever the view refreshes (via setNeedsDisplay: YES).
No other values for rect (I am not resizing the window).
For the 1-pixel rect I am still waiting - this does happen not very often.
Kind regards,
Gerriet.
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