| contributors | originalURL |
|---|---|
Jeehut |
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Text controls in the system are based on TextKit 1
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Started in OpenStep even before first version of Mac OS
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TextKit 2 is built on forward-looking design principles, used on macOS since v11
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TextKit 2 will coexist with TextKit 1 (for now), many new classes added, some updated
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Principles designed by:
- Correctness: abstract away glyph handling
- Safety: heavier focus on value semantics
- Performance: viewport-based layout and rendering
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Glyph: Visual representation of a variable number of characters, e.g. ñ is 2 glyphs
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Ligature: Single glyph representing multiple characters
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Glyph ranges were impossible to use right in many languages, TextKit 2 simplifies it
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In TextKit 2 all text is rendered with CoreText, no glyph ranges needed, higher level objects like
NSTextSelection,NSTextSelectionNavigation -
Contributor comment: didn't continue watching from here as too low-level/irrelevant for me