Re: Catalina scroll view issues
Re: Catalina scroll view issues
- Subject: Re: Catalina scroll view issues
- From: Redler Eyal via Cocoa-dev <email@hidden>
- Date: Tue, 17 Dec 2019 12:12:29 +0200
I am drawing using core graphics. I tried turning copiesOnScroll and this
didn't seem to help.
I'll gladly write a feedback report but I'm not able to reproduce this so I
can't give an xcode project that will reproduce this... Isn't that a
requirement?
BTW, perhaps you know: Are there no release notes for app kit with Catalina?
All I can find are very general notes without mention of any specific API. I
could not find, for example, any mention of the deprecation of copiesOnScroll
and what it means (is is not always on, always off etc)
Thanks,
Eyal
> On 16 Dec 2019, at 16:07, Gary L. Wade <email@hidden> wrote:
>
> If you’re not involving a higher level class like NSTextView or a medium
> level one like CoreText, it sounds like you might be going all the way down
> to CoreGraphics? If so, you might find your disparity between your system and
> your users in things like retina choice for a particular display and changes
> with respect to layers, especially things like the copiesOnScroll. If these
> don’t lead you to a solution where you say, “Oh, I really should’ve done this
> rather than that,” (20/20 hindsight) then write up a feedback report and add
> its URL here.
> --
> Gary L. Wade
> http://www.garywade.com/
>
>> On Dec 16, 2019, at 1:03 AM, Redler Eyal via Cocoa-dev
>> <email@hidden> wrote:
>>
>> Thanks!
>> I don't use CoreText or NSTextView. I pretty much ruled out RTL vs LTR
>> issues since this is showing up in documents containing either and both. I'm
>> also unable to imagine how some text drawing code could produce such
>> artifacts as splitting a subview in the middle.
>> (http://eyalredler.com/stuff/catalina_glitch.png)
>>
>> Eyal
>>
>>
>>
>>
>>> On 14 Dec 2019, at 21:20, Gary L. Wade <email@hidden> wrote:
>>>
>>> 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
>>>
>
_______________________________________________
Cocoa-dev mailing list (email@hidden)
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:
This email sent to email@hidden