I recently tried to fix "TableView: visual glitch at borders on horizontal scrolling". Ticket: [1]https://bugs.openjdk.java.net/browse/JDK-8218745 PR: [2]https://github.com/openjdk/jfx/pull/630
As also written in the PR I have problems understanding the snapping/scaling of JavaFX. Here in short what I found out: - Snapping fixed the issue for a scale of 1 or 2, but not for a scale like 1.25 or 1.5 --- Also VirtualFlow is the only occurence where we set the layoutX of a clip (might be the problem?) - This visual glitch only happens sometimes when the x value is a decimal number, e.g. 12.66 (never when it's a round number like 13) - Math.round(..) or a cast to int fixed this (for all scales), but is probably not the correct solution or maybe only fixing a symptom here Which leads to my question where may some of you can help me: - How does JavaFX renders a node when e.g. x is a decimal number? How many pixel are used then? - And does a decimal number make sense (Why we e.g. don't round the value), which looks like it works fine and doesn't result in visual glitches Also information/insights about fixes made in the past which relates with this are welcome. I saw that there were quite some issues with a scale other then 1 in the past. Note: If the result is that everything works as expected chances are there might a generic problem with snapping/layout/rendering somewhere then. Any information are welcome and feel free to also have a look at the PR. -- Marius References 1. https://bugs.openjdk.java.net/browse/JDK-8218745 2. https://github.com/openjdk/jfx/pull/630
