あふれ項目の退避メニュー

<%# Overflow-menu demo: drag the width slider to shrink the toolbar — the controller
    measures the items and banks the lowest-priority ones into the More menu (delegated
    to stimeo--menu), moving them back as space returns. Items carry the Menu item
    data-action up front; it stays inert in the bar (no stimeo--menu ancestor there) and
    activates once an item is banked into the More menu. The library moves items and sets
    data-overflowing / data-overflow-count; demo.css owns the look. %>
<div class="overflow-demo">
  <label class="overflow-demo__width">
    <span><%= t("components.overflow_menu.demo.width") %></span>
    <input type="range" min="220" max="640" value="640" data-overflow-demo-width>
  </label>

  <div
    class="overflow-demo__bar"
    data-controller="stimeo--overflow-menu"
    role="toolbar"
    aria-label="<%= t("components.overflow_menu.name") %>">
    <div class="overflow-demo__items" data-stimeo--overflow-menu-target="items">
      <% %w[save edit share archive delete].each_with_index do |id, i| %>
        <button
          type="button"
          class="overflow-demo__item"
          <%= "data-priority=\"#{i + 1}\"".html_safe if i < 3 %>
          data-action="click->stimeo--menu#activate keydown->stimeo--menu#onItemKeydown">
          <%= t("components.overflow_menu.demo.#{id}") %>
        </button>
      <% end %>
    </div>

    <div
      class="overflow-demo__more"
      data-controller="stimeo--menu"
      data-stimeo--overflow-menu-target="more"
      hidden>
      <button
        type="button"
        class="overflow-demo__trigger"
        aria-haspopup="menu"
        aria-expanded="false"
        data-stimeo--menu-target="trigger"
        data-action="click->stimeo--menu#toggle keydown->stimeo--menu#onTriggerKeydown">
        <%= t("components.overflow_menu.demo.more") %>
      </button>
      <ul class="overflow-demo__menu" role="menu" data-stimeo--menu-target="menu" hidden></ul>
    </div>
  </div>
</div>

/*
 * Presentation-only styles for the overflow-menu demo. The library moves items between
 * the bar and the More menu and sets data-overflowing / data-overflow-count; this CSS
 * lays out the (clipped) toolbar, the items, the More button, and the dropdown.
 */

.overflow-demo {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.overflow-demo__width {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
}

.overflow-demo__bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}

.overflow-demo__items {
  display: flex;
  gap: 0.5rem;
  min-width: 0;
  /* Clip the items row — not the whole bar — so overflow is real (items that do not
     fit are what the controller banks), while the More dropdown (a sibling) can still
     escape and is not cut off by the bar's bounds. */
  overflow: hidden;
}

.overflow-demo__item,
.overflow-demo__trigger {
  flex: none;
  white-space: nowrap;
  padding: 0.375rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--surface-subtle);
  cursor: pointer;
}

.overflow-demo__more {
  position: relative;
  margin-left: auto;
}

.overflow-demo__menu {
  position: absolute;
  right: 0;
  top: calc(100% + 0.25rem);
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  min-width: 10rem;
  margin: 0;
  padding: 0.25rem;
  list-style: none;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--surface-card);
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.15);
}

/* Banked items become role="menuitem"; lay them out as full-width menu rows. */
.overflow-demo__menu .overflow-demo__item {
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
}

.overflow-demo__menu .overflow-demo__item:hover,
.overflow-demo__menu .overflow-demo__item:focus {
  background: var(--surface-subtle);
}

// Overflow-menu demo (consumer-side JS).
//
// No layout knobs are needed for the controller itself — it watches the bar with a
// ResizeObserver. This slider just changes the bar's width so the overflow can be seen
// happening; the controller reacts to the resize on its own.
document.querySelectorAll(".overflow-demo").forEach((root) => {
  const bar = root.querySelector('[data-controller~="stimeo--overflow-menu"]');
  const range = root.querySelector("[data-overflow-demo-width]");
  if (!bar || !range) return;

  const apply = () => {
    bar.style.maxWidth = `${range.value}px`;
  };
  apply();
  range.addEventListener("input", apply);
});