itk-viewer-material-ui/src/Images/GradientOpacitySlider.jsx

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import React, { useEffect, useRef, useState } from 'react'
import { useActor } from '@xstate/react'
import { Icon, IconButton, Slider, Tooltip } from '@mui/material'
import { gradientIconDataUri } from 'itk-viewer-icons'
import applyContrastSensitiveStyleToElement from '../applyContrastSensitiveStyleToElement'
import '../style.css'

function GradientOpacitySlider(props) {
  const { service } = props
  const sliderEntry = useRef(null)
  const gradientOpacitySlider = useRef(null)
  const gradientOpacityScaleSlider = useRef(null)
  const [vertSlider, setVertSlider] = useState(false)
  const [state, send] = useActor(service)
  const name = state.context.images.selectedName
  const actorContext = state.context.images.actorContext.get(name)

  useEffect(() => {
    applyContrastSensitiveStyleToElement(
      state.context,
      'invertibleButton',
      sliderEntry.current
    )
    state.context.images.gradientOpacitySlider = gradientOpacitySlider.current
    state.context.images.gradientOpacityScaleSlider =
      gradientOpacityScaleSlider.current
  }, [])

  const opacityScaleSliderChanged = (value) => {
    send({
      type: 'IMAGE_GRADIENT_OPACITY_SCALE_CHANGED',
      data: {
        name: state.context.images.selectedName,
        gradientOpacityScale: value
      }
    })
  }

  const opacitySliderChanged = (value) => {
    send({
      type: 'IMAGE_GRADIENT_OPACITY_CHANGED',
      data: {
        name: state.context.images.selectedName,
        gradientOpacity: value
      }
    })
  }

  return (
    <div className="iconWithSlider">
      <Tooltip
        ref={sliderEntry}
        title="Gradient opacity scale"
        PopperProps={{
          anchorEl: sliderEntry.current,
          disablePortal: true,
          keepMounted: true
        }}
      >
        <IconButton
          size="small"
          onClick={() => {
            setVertSlider(!vertSlider)
          }}
        >
          <Icon className="sliderEntry">
            <img src={gradientIconDataUri} />
          </Icon>
        </IconButton>
      </Tooltip>
      <div className="gradientOpacityScale">
        <Slider
          ref={gradientOpacitySlider}
          className={`slider gradientOpacityInput ${
            vertSlider ? '' : 'hidden'
          }`}
          orientation="vertical"
          min={0}
          max={1}
          value={actorContext.gradientOpacity}
          step={0.01}
          onChange={(_e, val) => {
            opacitySliderChanged(val)
          }}
        />
      </div>
      <Slider
        ref={gradientOpacityScaleSlider}
        className="slider"
        min={0}
        max={0.99}
        value={actorContext.gradientOpacityScale}
        step={0.01}
        onChange={(_e, val) => {
          opacityScaleSliderChanged(val)
        }}
      />
    </div>
  )
}

export default GradientOpacitySlider