Lightning talk from Andy Matuschak
summary
The original 2007 iOS touch API uses DOM-like capturing and bubbling and breaks when building rich multi-touch UIs; a monolithic state machine proves buggy and is removed after a few years. The platform replaces it with independent state machines per gesture plus declarative rules that express relationships (e.g. scroll vs edge-swipe in Mail, tap/double-tap/pan/pinch in Maps, multi-finger reorder in Keynote), enabling simultaneous recognition across disjoint touches and working reliably while still allowing overrides.
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