WIP: Line graph UI rewire

assets/js/dashboard/components/graph-tooltip.tsx

@@ -0,0 +1,65 @@
+import React, { ReactNode, useLayoutEffect, useRef, useState } from 'react'
+import { Transition } from '@headlessui/react'
+
+export const GraphTooltipWrapper = ({
+  x,
+  y,
+  maxX,
+  minWidth,
+  children,
+  className,
+  onClick,
+  isTouchDevice
+}: {
+  x: number
+  y: number
+  maxX: number
+  minWidth: number
+  children: ReactNode
+  className?: string
+  onClick?: () => void
+  isTouchDevice?: boolean
+}) => {
+  const ref = useRef<HTMLDivElement>(null)
+  // bigger on mobile to have room between thumb and tooltip
+  const xOffsetFromCursor = isTouchDevice ? 24 : 12
+  const yOffsetFromCursor = isTouchDevice ? 48 : 24
+  const [measuredWidth, setMeasuredWidth] = useState(minWidth)
+  // center tooltip above the cursor, clamped to prevent left/right overflow
+  const rawLeft = x + xOffsetFromCursor
+  const tooltipLeft = Math.max(0, Math.min(rawLeft, maxX - measuredWidth))
+
+  useLayoutEffect(() => {
+    if (!ref.current) {
+      return
+    }
+    setMeasuredWidth(ref.current.offsetWidth)
+  }, [children, className, minWidth])
+
+  return (
+    <Transition
+      as={React.Fragment}
+      appear
+      show
+      // enter delay on mobile is needed to prevent the tooltip from entering when the user starts to y-pan
+      // but the y-pan is not yet certain
+      enter={isTouchDevice ? 'transition-opacity duration-0 delay-150' : ''}
+      enterFrom={isTouchDevice ? 'opacity-0' : ''}
+      enterTo={isTouchDevice ? 'opacity-100' : ''}
+    >
+      <div
+        ref={ref}
+        className={className}
+        onClick={onClick}
+        style={{
+          minWidth,
+          left: tooltipLeft,
+          top: y,
+          transform: `translateY(-100%) translateY(-${yOffsetFromCursor}px)`
+        }}
+      >
+        {children}
+      </div>
+    </Transition>
+  )
+}