react-native-wagmi-charts/lib/module/charts/line/CursorLine.js

A sweet candlestick chart for React Native

function _extends() { return _extends = Object.assign ? Object.assign.bind() : function (n) { for (var e = 1; e < arguments.length; e++) { var t = arguments[e]; for (var r in t) ({}).hasOwnProperty.call(t, r) && (n[r] = t[r]); } return n; }, _extends.apply(null, arguments); }
import React from 'react';
import { StyleSheet } from 'react-native';
import Animated, { useAnimatedStyle, useDerivedValue, useAnimatedProps } from 'react-native-reanimated';
import Svg, { Line as SVGLine } from 'react-native-svg';
import { AnimatedText } from '../../components/AnimatedText';
import { LineChartDimensionsContext } from './Chart';
import { LineChartCursor } from './Cursor';
import { useLineChartDatetime } from './useDatetime';
import { useLineChart } from './useLineChart';
import { useLineChartPrice } from './usePrice';
LineChartCursorLine.displayName = 'LineChartCursorLine';
const TEXT_CONSTANTS = {
  DEFAULT_COLOR: '#1A1E27',
  DEFAULT_FONT_SIZE: 12,
  CHAR_WIDTH_RATIO: 0.6,
  MIN_WIDTH: 25,
  MAX_WIDTH: 150,
  INPUT_PADDING: 4
};
const SPACING = {
  VERTICAL_TEXT_OFFSET: 40,
  HORIZONTAL_TEXT_MARGIN: 8,
  HORIZONTAL_RIGHT_MARGIN: 16,
  BASE_LINE_GAP: 8,
  X_AXIS_LABEL_RESERVED_HEIGHT: 40 // Reserved space at bottom for x-axis labels
};
const AnimatedLine = Animated.createAnimatedComponent(SVGLine);
export function LineChartCursorLine({
  children,
  color = 'gray',
  lineProps,
  format,
  textStyle,
  ...cursorProps
}) {
  const isHorizontal = cursorProps?.orientation === 'horizontal';
  const {
    height,
    width
  } = React.useContext(LineChartDimensionsContext);
  const {
    currentX,
    currentY,
    isActive
  } = useLineChart();
  const price = useLineChartPrice({
    format: isHorizontal ? format : undefined,
    precision: 2
  });
  const datetime = useLineChartDatetime({
    format: !isHorizontal ? format : undefined
  });
  const displayText = isHorizontal ? price.formatted : datetime.formatted;
  const calculateTextWidth = (text, fontSize) => {
    'worklet';

    const charWidth = fontSize * TEXT_CONSTANTS.CHAR_WIDTH_RATIO;
    const calculatedWidth = text.length * charWidth;
    return Math.max(TEXT_CONSTANTS.MIN_WIDTH, Math.min(TEXT_CONSTANTS.MAX_WIDTH, calculatedWidth));
  };
  const textWidth = useDerivedValue(() => {
    const text = displayText.value;
    if (!text) return TEXT_CONSTANTS.MIN_WIDTH;
    const fontSize = textStyle?.fontSize || TEXT_CONSTANTS.DEFAULT_FONT_SIZE;
    return calculateTextWidth(text, fontSize);
  }, [displayText, textStyle?.fontSize]);
  const lineEndX = useDerivedValue(() => {
    if (!isHorizontal) return 0;
    const fontSize = textStyle?.fontSize || TEXT_CONSTANTS.DEFAULT_FONT_SIZE;
    const gap = Math.max(SPACING.BASE_LINE_GAP, fontSize * 0.5);
    return width - textWidth.value - gap - TEXT_CONSTANTS.INPUT_PADDING - SPACING.HORIZONTAL_RIGHT_MARGIN;
  });
  const lineEndY = useDerivedValue(() => {
    if (isHorizontal) return 0;

    // For vertical cursor, extend line to the chart area (excluding reserved label space)
    return height - SPACING.X_AXIS_LABEL_RESERVED_HEIGHT;
  });
  const containerStyle = useAnimatedStyle(() => ({
    opacity: isActive.value ? 1 : 0,
    height: '100%',
    transform: isHorizontal ? [{
      translateY: currentY.value
    }] : [{
      translateX: currentX.value
    }]
  }));
  const calculateFontSizeAdjustment = fontSize => {
    'worklet';

    return Math.max(0.6, Math.min(0.8, 0.7 + (fontSize - 12) * 0.01));
  };
  const textPositionStyle = useAnimatedStyle(() => {
    const fontSize = textStyle?.fontSize || TEXT_CONSTANTS.DEFAULT_FONT_SIZE;
    const lineHeight = textStyle?.lineHeight || fontSize * 1.2;
    const baseStyle = {
      position: 'absolute',
      width: textWidth.value,
      fontSize,
      lineHeight,
      color: textStyle?.color || TEXT_CONSTANTS.DEFAULT_COLOR,
      ...textStyle
    };
    if (isHorizontal) {
      const fontSizeAdjustment = calculateFontSizeAdjustment(fontSize);
      const textCenterOffset = -(lineHeight * fontSizeAdjustment);
      return {
        ...baseStyle,
        left: width - textWidth.value - SPACING.HORIZONTAL_RIGHT_MARGIN + TEXT_CONSTANTS.INPUT_PADDING,
        top: textCenterOffset,
        textAlign: 'right',
        paddingLeft: 0,
        paddingRight: 0
      };
    }

    // For vertical cursor (x-axis label)
    const halfTextWidth = textWidth.value / 2;

    // Since the container is already translated by currentX, we need to calculate
    // the label position relative to the container's position
    const containerX = currentX.value;

    // Calculate where the label would be if centered
    let labelLeft = -halfTextWidth;

    // Check if label would overflow on the left
    if (containerX + labelLeft < 0) {
      labelLeft = -containerX;
    }

    // Check if label would overflow on the right
    if (containerX + labelLeft + textWidth.value > width) {
      labelLeft = width - containerX - textWidth.value;
    }

    // Position label in the reserved space at the bottom
    const labelTop = height - SPACING.X_AXIS_LABEL_RESERVED_HEIGHT + SPACING.HORIZONTAL_TEXT_MARGIN;
    return {
      ...baseStyle,
      left: labelLeft,
      top: labelTop,
      textAlign: 'center'
    };
  });
  const lineAnimatedProps = useAnimatedProps(() => ({
    x1: 0,
    y1: 0,
    x2: lineEndX.value,
    y2: lineEndY.value
  }), [lineEndX, lineEndY]);
  return /*#__PURE__*/React.createElement(LineChartCursor, _extends({}, cursorProps, {
    type: "line"
  }), /*#__PURE__*/React.createElement(Animated.View, {
    style: containerStyle
  }, /*#__PURE__*/React.createElement(Svg, {
    style: styles.svg
  }, /*#__PURE__*/React.createElement(AnimatedLine, _extends({
    animatedProps: lineAnimatedProps,
    strokeWidth: 2,
    stroke: color,
    strokeDasharray: "3 3"
  }, lineProps))), /*#__PURE__*/React.createElement(AnimatedText, {
    text: displayText,
    style: textPositionStyle
  })), children);
}
const styles = StyleSheet.create({
  svg: {
    ...StyleSheet.absoluteFillObject,
    height: '100%'
  }
});
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