react-native-gesture-handler#GestureEvent TypeScript Examples

The following examples show how to use react-native-gesture-handler#GestureEvent. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: Cursor.tsx    From react-native-wagmi-charts with MIT License 5 votes vote down vote up 
export function LineChartCursor({
  children,
  type,
  ...props
}: LineChartCursorProps) {
  const { pathWidth: width, path } = React.useContext(
    LineChartDimensionsContext
  );
  const { currentX, currentIndex, isActive, data } = useLineChart();

  const parsedPath = React.useMemo(
    () => (path ? parse(path) : undefined),
    [path]
  );

  const onGestureEvent = useAnimatedGestureHandler<
    GestureEvent<LongPressGestureHandlerEventPayload>
  >({
    onActive: ({ x }) => {
      if (parsedPath) {
        const boundedX = x <= width ? x : width;
        isActive.value = true;
        currentX.value = boundedX;

        // on Web, we could drag the cursor to be negative, breaking it
        // so we clamp the index at 0 to fix it
        // https://github.com/coinjar/react-native-wagmi-charts/issues/24
        const minIndex = 0;
        const boundedIndex = Math.max(
          minIndex,
          Math.round(boundedX / width / (1 / (data.length - 1)))
        );

        currentIndex.value = boundedIndex;
      }
    },
    onEnd: () => {
      isActive.value = false;
      currentIndex.value = -1;
    },
  });

  return (
    <CursorContext.Provider value={{ type }}>
      <LongPressGestureHandler
        minDurationMs={0}
        maxDist={999999}
        onGestureEvent={onGestureEvent}
        {...props}
      >
        <Animated.View style={StyleSheet.absoluteFill}>
          {children}
        </Animated.View>
      </LongPressGestureHandler>
    </CursorContext.Provider>
  );
}
Example #2
Source File: Crosshair.tsx    From react-native-wagmi-charts with MIT License 4 votes vote down vote up 
export function CandlestickChartCrosshair({
  color,
  onCurrentXChange,
  children,
  horizontalCrosshairProps = {},
  verticalCrosshairProps = {},
  lineProps = {},
  ...props
}: CandlestickChartCrosshairProps) {
  const { width, height } = React.useContext(CandlestickChartDimensionsContext);
  const { currentX, currentY, step } = useCandlestickChart();

  const tooltipPosition = useSharedValue<'left' | 'right'>('left');

  const opacity = useSharedValue(0);
  const onGestureEvent = useAnimatedGestureHandler<
    GestureEvent<LongPressGestureHandlerEventPayload>
  >({
    onActive: ({ x, y }) => {
      const boundedX = x <= width - 1 ? x : width - 1;
      if (boundedX < 100) {
        tooltipPosition.value = 'right';
      } else {
        tooltipPosition.value = 'left';
      }
      opacity.value = 1;
      currentY.value = clamp(y, 0, height);
      currentX.value = boundedX - (boundedX % step) + step / 2;
    },
    onEnd: () => {
      opacity.value = 0;
      currentY.value = -1;
      currentX.value = -1;
    },
  });
  const horizontal = useAnimatedStyle(() => ({
    opacity: opacity.value,
    transform: [{ translateY: currentY.value }],
  }));
  const vertical = useAnimatedStyle(() => ({
    opacity: opacity.value,
    transform: [{ translateX: currentX.value }],
  }));

  useAnimatedReaction(
    () => currentX.value,
    (data, prevData) => {
      if (data !== -1 && data !== prevData && onCurrentXChange) {
        runOnJS(onCurrentXChange)(data);
      }
    }
  );

  return (
    <LongPressGestureHandler
      minDurationMs={0}
      maxDist={999999}
      onGestureEvent={onGestureEvent}
      {...props}
    >
      <Animated.View style={StyleSheet.absoluteFill}>
        <Animated.View
          style={[StyleSheet.absoluteFill, horizontal]}
          {...horizontalCrosshairProps}
        >
          <CandlestickChartLine color={color} x={width} y={0} {...lineProps} />
          <CandlestickChartCrosshairTooltipContext.Provider
            value={{ position: tooltipPosition }}
          >
            {children}
          </CandlestickChartCrosshairTooltipContext.Provider>
        </Animated.View>
        <Animated.View
          style={[StyleSheet.absoluteFill, vertical]}
          {...verticalCrosshairProps}
        >
          <CandlestickChartLine color={color} x={0} y={height} {...lineProps} />
        </Animated.View>
      </Animated.View>
    </LongPressGestureHandler>
  );
}