modeling-app/src/components/Tooltip.module.css

/* Adapted from https://github.com/argyleink/gui-challenges/blob/main/tooltips/tool-tip.css */

.tooltip {
  /* Used to power spacing and layout for RTL languages */
  --isRTL: -1;

  /* internal CSS vars */
  --_delay: 200ms;
  --_triangle-width: 8px;
  --_triangle-height: 12px;
  --_p-inline-arrow-alignment: calc(
    50% + calc(var(--isRTL) * var(--_triangle-width) / 2)
  );
  --_p-block: 4px;
  --_bg: var(--chalkboard-10);
  --_shadow-alpha: 8%;
  --_theme-alpha: 0.15;

  pointer-events: none;
  user-select: none;

  /* The parts that will be transitioned */
  opacity: 0;
  transform: translate(var(--_x, 0), var(--_y, 0));
  transition: transform 0.15s ease-out, opacity 0.11s ease-out;

  position: absolute;
  z-index: 1;
  inline-size: max-content;
  max-inline-size: 25ch;
  text-align: start;
  font-family: var(--mono-font-family);
  text-transform: none;
  font-size: 0.9rem;
  font-weight: normal;
  line-height: initial;
  letter-spacing: 0;
  padding: var(--_p-block) calc(2 * var(--_p-block));
  margin: 0;
  border-radius: 3px;
  background: var(--_bg);
  @apply text-chalkboard-110;
  will-change: filter;
  filter: drop-shadow(0 1px 2px hsl(0 0% 0% / var(--_shadow-alpha)))
    drop-shadow(0 4px 6px hsl(0 0% 0% / calc(var(--_shadow-alpha) / 2)));
}

:global(.dark) .tooltip {
  --_bg: var(--chalkboard-90);
  --_theme-alpha: 40%;
  --_shadow-alpha: 16%;
  @apply text-chalkboard-10;
}

.tooltip:dir(rtl) {
  --isRTL: 1;
}

/* :has and :is are pretty fresh CSS pseudo-selectors, may not see full support */
:has(> .tooltip) {
  position: relative;
}

:is(:hover, :active) > .tooltip {
  opacity: 1;
  transition-delay: var(--_delay);
}

:is(:focus-visible) > .tooltip.withFocus {
  opacity: 1;
}

.tooltip:focus-visible {
  --_delay: 0 !important;
}

/* prepend some prose for screen readers only */
.tooltip::before {
  content: '; Has tooltip: ';
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  width: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
}

/* Sometimes there's no visible label,
 * so we'll use the tooltip as the label
*/
.tooltip:only-child::before {
  content: 'Tooltip:';
}

.caret {
  width: 8px;
  height: var(--_triangle-height);
  position: absolute;
  z-index: -1;
  transform-origin: center center;
  color: var(--_bg);
}

.top,
.bottom {
  text-align: center;
}

.tooltip.top {
  inset-inline-start: 50%;
  inset-block-end: calc(100% + var(--_p-block) + var(--_triangle-height));
  --_x: calc(50% * var(--isRTL));
}

.top .caret {
  inset-block-start: calc(100% - 1px);
  inset-inline-start: 50%;
  transform: translateX(-50%);
}

.tooltip.top-right {
  inset-inline-end: var(--_p-inline-arrow-alignment);
  inset-block-end: calc(100% + var(--_p-block) + var(--_triangle-height));
}

/* The corner caret SVG is bottom-right oriented by default */
.top-right .caret {
  inset-block-start: calc(100% - 1px);
  inset-inline-end: 0;
}

.tooltip.right {
  inset-inline-start: calc(100% + var(--_triangle-height));
  inset-block-end: 50%;
  --_y: 50%;
}

.right .caret {
  inset-inline-end: calc(100% - 1px);
  inset-block-start: 50%;
  transform: translateY(-50%) rotate(90deg);
}

.tooltip.bottom-right {
  inset-inline-end: var(--_p-inline-arrow-alignment);
  inset-block-start: calc(100% + var(--_p-block) + var(--_triangle-height));
}

.bottom-right .caret {
  inset-block-end: calc(100% - 1px);
  inset-inline-end: 0;
  transform: rotate(180deg) scaleX(-1);
}

.tooltip.bottom {
  --_x: calc(50% * var(--isRTL));
  inset-inline-start: 50%;
  inset-block-start: calc(100% + var(--_p-block) + var(--_triangle-height));
}

.bottom .caret {
  inset-block-end: calc(100% - 1px);
  inset-inline-start: 50%;
  transform: translateX(-50%) scaleY(-1);
}

.tooltip.bottom-left {
  inset-inline-start: var(--_p-inline-arrow-alignment);
  inset-block-start: calc(100% + var(--_p-block) + var(--_triangle-height));
}

.bottom-left .caret {
  inset-block-end: calc(100% - 1px);
  inset-inline-start: 0;
  transform: rotate(180deg);
}

.tooltip.left {
  inset-inline-end: calc(
    100% + var(--_p-inline-arrow-alignment) + var(--_triangle-height)
  );
  inset-block-end: 50%;
  --_y: 50%;
}

.left .caret {
  inset-inline-start: calc(100% - 1px);
  inset-block-start: 50%;
  transform: translateY(-50%) rotate(-90deg);
}

.tooltip.top-left {
  inset-inline-start: var(--_p-inline-arrow-alignment);
  inset-block-end: calc(100% + var(--_p-block) + var(--_triangle-height));
}

.top-left .caret {
  inset-block-start: calc(100% - 1px);
  inset-inline-start: 0;
  transform: rotate(-90deg);
}

@media (prefers-reduced-motion: no-preference) {
  /* TOP || BLOCK-START */
  :has(> :is(.tooltip.top, .tooltip.top-left, .tooltip.top-right)):not(
      :hover,
      :active
    )
    .tooltip {
    --_y: 3px;
  }

  /* RIGHT || INLINE-END */
  :has(> :is(.tooltip.right)):not(:hover, :active) .tooltip {
    --_x: calc(var(--isRTL) * -3px * -1);
  }

  /* BOTTOM || BLOCK-END */
  :has(
      > :is(
          .tooltip.bottom,
          .tooltip.tooltip.bottom-left,
          .tooltip.bottom-right
        )
    ):not(:hover, :active)
    .tooltip {
    --_y: -3px;
  }

  /* BOTTOM || BLOCK-END */
  :has(> :is(.tooltip.left)):not(:hover, :active) .tooltip {
    --_x: calc(var(--isRTL) * 3px * -1);
  }
}