# All files / components MosaicLayer.tsx

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     import * as React from 'react'
    import {useRef, FunctionComponent} from 'react'

    import {useCanvas} from '../utils/useCanvas'
    import {drawMosaic} from '../utils/drawMosaic'
    import {
      MosaicLayerConfig,
      MosaicLayerSpec,
      LayerProps,
      LegendData,
    } from '../types'
    import {
      findHoveredBoxes,
      getMosaicTooltipData,
    } from '../utils/legend/mosaicTooltip'
    import {Tooltip} from './Tooltip'

    export interface Props extends LayerProps {
      spec: MosaicLayerSpec
      config: MosaicLayerConfig
    }

    export const MosaicLayer: FunctionComponent<Props> = ({
      spec,
      config,
      plotConfig,
      width,
      height,
      xScale,
      yScale,
      hoverX,
      hoverY,
      yColumnType,
      columnFormatter,
    }) => {
      const hoveredRowIndices = findHoveredBoxes(
        config.hoverDimension,
        hoverX,
        hoverY,
        spec.table,
        xScale,
        yScale,
        spec.yDomain,
        spec.ySeries,
        width,
        height
      )

      const drawMosaicOptions = {
        table: spec.table,
        xScale,
        yScale,
        fillScale: spec.scales.fill,
        hoveredRowIndices,
        yColumnType,
        strokeWidth: config.strokeWidth,
        strokePadding: config.strokePadding,
        strokeOpacity: config.strokeOpacity,
        fillOpacity: config.fillOpacity,
      }
      const canvasRef = useRef<HTMLCanvasElement>(null)

      useCanvas(
        canvasRef,
        width,
        height,
        context => drawMosaic({context, ...drawMosaicOptions}),
        Object.values(drawMosaicOptions)
      )

      let tooltipData: LegendData = []
      if (hoveredRowIndices.length > 0) {
        tooltipData = getMosaicTooltipData(
          hoveredRowIndices,
          spec.table,
          spec.inputTable,
          config.x,
          spec.yColumnsName,
          spec.columnGroupMaps.fill,
          spec.scales.fill,
          columnFormatter
        )
      }
      return (
        <>
          <canvas
            className="giraffe-layer giraffe-layer-mosaic"
            ref={canvasRef}
            style={{position: 'absolute'}}
            data-testid="giraffe-layer-mosaic"
          />
          {tooltipData.length > 0 && (
            <Tooltip data={tooltipData} config={plotConfig} />
          )}
        </>
      )
    }

    MosaicLayer.displayName = 'MosaicLayer'