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 > <cocoa-dev@lists.apple.com> 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 _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
