Add additional event API responder surfaces#15248
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trueadm merged 3 commits intofacebook:masterfrom Mar 29, 2019
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trueadm
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trueadm
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👀 I really like how this is shaping up. |
necolas
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Mar 29, 2019
| import {REACT_EVENT_COMPONENT_TYPE} from 'shared/ReactSymbols'; | ||
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| const targetEventTypes = ['pointerdown', 'pointercancel']; | ||
| const rootEventTypes = ['pointerup', {name: 'pointermove', passive: false}]; |
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I think we could document why certain events are not passive throughout these event module implementations.
| listener: (e: Object) => void, | ||
| state: DragState, | ||
| discrete: boolean, | ||
| eventData?: { |
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We should figure out the event shapes we want for these events. Drag will probably need the delta, coordinates in space, offset from initial position, and velocity.
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| if ( | ||
| props.onShouldClaimOwnership && | ||
| props.onShouldClaimOwnership() |
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This prop name doesn't seem quite right. In the RN responder system there are onStartShouldSetResponder and onMoveShouldSetResponder props to determine whether the view wants to become the responder after a start or move event.
| } | ||
| break; | ||
| } | ||
| case 'pointercancel': |
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we might eventually want a separate event to be called if the drag is cancelled
| import {REACT_EVENT_COMPONENT_TYPE} from 'shared/ReactSymbols'; | ||
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| const targetEventTypes = [ | ||
| {name: 'focus', passive: true, capture: true}, |
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curious why these need to be passive and capture
| if (props.onSwipeLeft && direction === 3) { | ||
| dispatchSwipeEvent( | ||
| context, | ||
| 'swipeleft', |
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I think it might be preferable to have a single event like onSwipe with event data that provides the direction, velocity, etc. That would be simpler to work with in userland than potentially listening to 4 events.
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Note: this is for an experimental event API that we're testing out internally at Facebook.
This PR adds more event responder surfaces, fills in the TODOs around the responder ownership model and also fixes some bugs found with internal user testing.