Retry Imperative Conditions with RxSwift Using a Delay

In The Archive, people relying on character composition to enter their text noticed that the auto-saving routing got in the way and aborted the composable editing mode. This affects e.g. Chinese or Japanese character input on macOS, but also when you hit a composable accent like ´ after which the text editor waits for another character to put underneath the accent.

Continue reading …

Decorate NSGlyphStorage to Replace Glyphs On-the-Fly

There are many ways to affect the glyphs that are used to show text on screen. Since macOS 10.11 El Capitan (released in 2015), possibly the simplest override points are in NSLayoutManagerDelegate. Another, arguably more ancient way to replace glyphs on-the-fly is to override and customize NSGlyphGenerator. This predates the existence of NSLayoutManagerDelegate, and it’s not even available on iOS, so that’s how arcane the approach outlines here will be.

Continue reading …

Why the Selection Changes When You Do Syntax Highlighting in a NSTextView and What You Can Do About It

Teaser image

On iOS, this does maybe not happen at all, but when you want to write syntax highlighting code for macOS apps, copying together stuff from around the web, you’ll end up with broken application behavior. In short: when you type and the attributes of the line change, the insertion point is moved to the end of the line. That sucks.

Continue reading …