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Allow for start offset on panning, to prevent jumps when panning star… #16

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merged 1 commit into from
Jul 7, 2023
Merged

Allow for start offset on panning, to prevent jumps when panning star… #16

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10 changes: 10 additions & 0 deletions index.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,8 @@ export default function Zoom(props: PropsWithChildren<ZoomProps>): React.ReactNo
const translateY = useSharedValue(0)
const lastOffsetX = useSharedValue(0)
const lastOffsetY = useSharedValue(0)
const panStartOffsetX = useSharedValue(0)
const panStartOffsetY = useSharedValue(0)

const handlePanOutsideTimeoutId: React.MutableRefObject<number | undefined> = useRef()

Expand Down Expand Up @@ -233,6 +235,10 @@ export default function Zoom(props: PropsWithChildren<ZoomProps>): React.ReactNo
})

const panGesture = Gesture.Pan()
.onStart((event: GestureUpdateEvent<PanGestureHandlerEventPayload>): void => {
panStartOffsetX.value = event.translationX
panStartOffsetY.value = event.translationY
})
.onUpdate((event: GestureUpdateEvent<PanGestureHandlerEventPayload>): void => {
let { translationX, translationY } = event

Expand All @@ -243,6 +249,8 @@ export default function Zoom(props: PropsWithChildren<ZoomProps>): React.ReactNo

translationX -= panOffsetsBeforeGestureStart.value.x
translationY -= panOffsetsBeforeGestureStart.value.y
translationX -= panStartOffsetX.value
translationY -= panStartOffsetY.value

translateX.value = lastOffsetX.value + translationX / lastScale.value
translateY.value = lastOffsetY.value + translationY / lastScale.value
Expand All @@ -254,6 +262,8 @@ export default function Zoom(props: PropsWithChildren<ZoomProps>): React.ReactNo
translationX -= panOffsetsBeforeGestureStart.value.x
translationY -= panOffsetsBeforeGestureStart.value.y
}
translationX -= panStartOffsetX.value
translationY -= panStartOffsetY.value

// SAVES LAST POSITION
lastOffsetX.value = lastOffsetX.value + translationX / lastScale.value
Expand Down