Re: Catalina scroll view issues
Re: Catalina scroll view issues
- Subject: Re: Catalina scroll view issues
- From: "Gary L. Wade via Cocoa-dev" <email@hidden>
- Date: Sat, 14 Dec 2019 11:20:10 -0800
I see from your personal web site you know Hebrew. Is it possible the
affected/non-drawing pages contain some RTL text while those that don’t only
contain LTR? I have seen some bugs with RTL text within NSTextView where the
text was/wasn’t drawing in a similar manner. Do you operate at a CoreText level?
--
Gary L. Wade
http://www.garywade.com/
> On Dec 14, 2019, at 6:17 AM, Redler Eyal via Cocoa-dev
> <email@hidden> wrote:
>
> Hi All,
>
> I'm getting reports from users complaining about a strange display issue on
> Catalina with my app.
> My app is a word-processor (not based on the cocoa text system) whose main
> display shows the pages of the document. Every page is a separate view and
> all the pages are subviews of one big view which resides inside a scroll view.
>
> The problem is that when with some documents, sometimes, when the user
> scrolls down the document, some pages are not drawn or even partially drawn.
> When the user clicks the place where the page is supposed to appear, it shows
> up.
> Another interesting bit is seems that while the scroll view background is
> drawn, the document views (the view containing the page views) drawRect is
> not called or at least not taking effect, I can tell because the pages on
> this view cast a shadow which is drawn by drawing blank squares on the
> document view with a transparency layer.
> Last bit of info, copiesOnScroll set to NO for this view and I see that this
> property is deprecated on Catalina.
>
> So far I'm struggling with this for a couple of weeks, I wasn't able to
> reproduce this at all on my machine.
> I'm really desperate for an answer and while I'm not expecting anyone here to
> provide me with one (wouldn't object, of course :-)) I would love if people
> reading this might try to speculate to the causes of this or perhaps if you
> have any direction as to what to test on my users machines in order to be
> able to reproduce this.
>
> Thanks
>
> Eyal Redler
> ------------------------------------------------------------------------------------------------
> "If Uri Geller bends spoons with divine powers, then he's doing it the hard
> way."
> --James Randi
> www.eyalredler.com
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