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flutter_flutter/sky/specs/gestures.md
Ian Hickson eb6f2f069e Update gestures.md 
Replace the old proposal with a placeholder for a description of the actual implementation.
2015-09-28 09:11:59 -07:00

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Gestures

Flutter's Gesture API has the following key components:

  • Pointers
  • Gesture Recognisers
  • Gesture Arenas

Pointers represent contact points on the display surface, also referred to as "touches". Pointers fire events describing when they are down, moved, up, or canceled.

Gesture recognisers examine sequences of pointer events and map them to higher-level descriptions like "tap", "drag", and so forth.

Gesture arenas disambiguate gestures when multiple recognisers in contention.

Pointers

TODO(ianh): elaborate

Gesture Arenas

TODO(ianh): elaborate

Gesture Recognisers

TODO(ianh): elaborate

Sample Scenarios

TODO(ianh): elaborate

Limitations

Flutter does not currently support the following features:

  • Mice, trackballs, trackpads, joysticks, "mouse keys", and other input mechanisms that map to persistent pointers.
  • Joysticks, trackballs, tabbing, and other mechanisms that map to directional or sequential focus navigation.
  • Hover touch effects, where touches are detected before being "down".