Very nice. Thanks Panos > On Feb 2, 2021, at 2:54 PM, panagiotis merakos via use-livecode > <use-livecode@lists.runrev.com> wrote: > > Hello folks, > > This bug report contains a workaround for smooth scrolling - hope it helps. > > https://quality.livecode.com/show_bug.cgi?id=19759 > > Cheers, > Panos > -- > > On Tue, 2 Feb 2021 at 16:17, Craig newman via use-livecode < > use-livecode@lists.runrev.com> wrote: > >> On a Mac, I made a field with 25000 words or so. Certainly dragging the >> thumb is jerky. >> >> But dragging the thumb forces the field's scroll to track the thumbPos, as >> it relates to the number of lines and the total "pixel" travel available to >> that thumb. I don't see how a field could scroll smoothly at all, since the >> thumb and the scroll are locked together. >> >> In other words, how can it "glide" from one line (scroll position) to >> another, since the thumbPos has a finite number of possible locations, and >> if there are a LOT of lines, each location may be several lines away? >> >> Craig >> >> -----Original Message----- >> From: use-livecode [mailto:use-livecode-boun...@lists.runrev.com] On >> Behalf >> Of Richard Gaskin via use-livecode >> Sent: Monday, February 01, 2021 10:11 PM >> To: use-livecode@lists.runrev.com >> Cc: Richard Gaskin <ambassa...@fourthworld.com> >> Subject: Re: Smooth scrolling >> >> David Epstein wrote: >> >>> My impression is that a LiveCode field scrolls less smoothly than > a >> comparable field in some other programs, such as MS Word and > Scrivener. >> If I paste about 25,000 words into a word wrapped > scrolling field, and >> then drag the scrolling thumb up and down > there is much more jumpiness >> than I see when I do the same thing > to the same text in those other >> programs. (LC 9.6 on Mac OS 10.12.6). >>> Do others see the same thing? Does anyone know the underlying cause > >> of this, or a remedy? >> >> Nice to hear the name Scrivener. Blount did some good rethinking of how >> words are managed when he came up with that app. >> >> In the olden days I remember being impressed with how smoothly LC scrolled >> vs things like Word, which wasn't all that surprising given that LC buffers >> the whole field in RAM while Word pages from disk. >> >> A lot's changed since then. Not only have SSDs taken over to narrow the >> gap, >> but I no longer have a copy of Word to compare anything to. :) >> >> But I did just do a quick test of LC v9.6.2rc2 vs LibreOffice Write on >> Ubuntu 18.04, using Kafka's Metamorphosis to get a reasonably close number >> of words to your test (Gutenberg Project RTF is 25,180 words: >> http://www.gutenberg.org/files/5200/5200-r.rtf ). >> >> Very different setup of course, but FWIW LC and LibreOffice are quite close >> in scrolling, though LC seems noticeably smoother. >> >> Of course Ubuntu and macOS couldn't be more different from top to bottom, >> with different font managers, buffering APIs, compositors, etc., so while >> it >> was easy for me to do this quick test it's almost entirely useless. >> >> What might be nice would be someone with good knowledge of Apple low-level >> tools, similar to the ones we see for Android or to some degree strace, >> where graphical UI stuff can be profiled so we can see what Word and LC are >> doing differently. >> >> It might also be worth setting the field's layerMode to "scrolling" and the >> stack's compositorType to "CoreGraphics" to see if that improves things. >> >> -- >> Richard Gaskin >> Fourth World Systems >> Software Design and Development for the Desktop, Mobile, and the Web >> ____________________________________________________________________ >> ambassa...@fourthworld.com http://www.FourthWorld.com >> >> _______________________________________________ >> use-livecode mailing list >> use-livecode@lists.runrev.com >> Please visit this url to subscribe, unsubscribe and manage your >> subscription >> preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode >> >> >> _______________________________________________ >> use-livecode mailing list >> use-livecode@lists.runrev.com >> Please visit this url to subscribe, unsubscribe and manage your >> subscription preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode >> > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode
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