ツールチップ

<%# Markup for the tooltip demo.
    Hover/focus on the trigger shows the supplementary description. The content is
    role="tooltip", referenced from the trigger via aria-describedby. The show/hide delay
    and the hoverable bridge between trigger and tooltip are the library's. Placement is
    the consumer's CSS. %>
<span class="tooltip" data-controller="stimeo--tooltip"
      data-stimeo--tooltip-show-delay-value="150"
      data-stimeo--tooltip-hide-delay-value="200">
  <button
    class="demo-trigger"
    type="button"
    data-stimeo--tooltip-target="trigger"
    aria-describedby="tooltip-content"
    data-action="
      mouseenter->stimeo--tooltip#show
      mouseleave->stimeo--tooltip#hide
      focusin->stimeo--tooltip#show
      focusout->stimeo--tooltip#hide">
    <%= t("components.tooltip.demo.trigger") %>
  </button>
  <span
    class="tooltip__content"
    id="tooltip-content"
    role="tooltip"
    data-stimeo--tooltip-target="content"
    data-action="
      mouseenter->stimeo--tooltip#show
      mouseleave->stimeo--tooltip#hide"
    hidden>
    <%= t("components.tooltip.demo.body") %>
  </span>
</span>

/*
 * Presentation-only styles for the tooltip demo.
 * Show/hide is the library toggling the content's hidden; data-state (open / closed)
 * can also drive transitions like a fade. Placement is static — the consumer's CSS.
 */

.tooltip {
  position: relative;
  display: inline-block;
}

.tooltip__content {
  position: absolute;
  bottom: calc(100% + 0.5rem);
  /* Anchor to the trigger's left for the no-JS fallback. The opt-in positioning
     module (demo.js) centers it via placement: "top" and shifts it away from the
     viewport edge. Do NOT use transform: translateX(-50%) here — it stacks on top
     of the inline left the positioning module sets, double-shifting the tooltip off
     the left edge (it gets clipped by the scrollable .content container). */
  left: 0;
  z-index: 10;
  width: max-content;
  max-width: 16rem;
  padding: 0.375rem 0.625rem;
  background: var(--color-text);
  color: var(--surface-page);
  border-radius: 0.375rem;
  font-size: 0.8125rem;
  line-height: 1.4;
  box-shadow: 0 4px 12px rgb(15 23 42 / 0.2);
}

/* Optional fade driven by data-state (the library only toggles hidden). */
.tooltip__content[data-state="open"] {
  opacity: 1;
}

// tooltip opt-in positioning demo (consumer-side JS).
//
// The core controller (stimeo--tooltip) only handles show/hide, delay, and dismiss.
// Viewport-edge flip/shift is optionally connected to the opt-in stimeo-ui/positioning
// module. We watch the content's hidden and, while shown, track the trigger's coordinates.
import { attachPositioning } from 'stimeo-ui/positioning';

document.querySelectorAll('[data-controller~="stimeo--tooltip"]').forEach((root) => {
  const trigger = root.querySelector('[data-stimeo--tooltip-target="trigger"]');
  const content = root.querySelector('[data-stimeo--tooltip-target="content"]');
  if (!trigger || !content) return;

  let detach = null;
  const sync = () => {
    if (!content.hidden && !detach) {
      detach = attachPositioning(trigger, content, { placement: 'top', offset: 8, padding: 8 });
    } else if (content.hidden && detach) {
      detach();
      detach = null;
      content.style.position = content.style.left = content.style.top = '';
    }
  };

  new MutationObserver(sync).observe(content, { attributes: true, attributeFilter: ['hidden'] });
  sync();
});