Context MenuATM

@layer components {

  .context-menu-trigger {

    display: flex; align-items: center; justify-content: center;

    border: 2px dashed var(--border); border-radius: var(--radius-lg);

    padding: 3rem; font-size: 0.875rem; color: var(--muted-foreground); cursor: default;

  }

  .context-menu {

    margin: 0; border: 1px solid var(--border); border-radius: var(--radius-lg);

    background-color: var(--popover); color: var(--popover-foreground);

    padding: 0.25rem; box-shadow: var(--shadow-md); min-width: 10rem;

    opacity: 0; transform: scale(0.95);

    transition: opacity 100ms ease, transform 100ms ease, display 100ms allow-discrete;

    &:popover-open { opacity: 1; transform: scale(1); }

  }

  @starting-style {

    .context-menu:popover-open { opacity: 0; transform: scale(0.95); }

  }

  .context-menu-item {

    display: flex; align-items: center; gap: 0.5rem; width: 100%;

    padding: 0.375rem 0.5rem; border: none; border-radius: var(--radius-md);

    background: transparent; color: var(--popover-foreground);

    font-size: 0.8125rem; font-family: inherit; text-align: left; cursor: pointer;

    transition: background-color 100ms ease;

    &:hover, &[data-highlighted] { background-color: var(--accent); color: var(--accent-foreground); }

    &:focus-visible { outline: 2px solid var(--ring); outline-offset: -2px; }

  }

  .context-menu-separator { height: 1px; background-color: var(--border); margin: 0.25rem -0.25rem; }

  /* -- Density ----------------------------------------------------

     data-density on the .context-menu root scales the container padding and

     the item rows. comfortable == the unsized default. */

  .context-menu:where([data-density="compact"]) {

    padding: 0.125rem;

    & .context-menu-item { padding: 0.25rem 0.5rem; }

  }

  .context-menu:where([data-density="comfortable"]) {

    padding: 0.25rem;

    & .context-menu-item { padding: 0.375rem 0.5rem; }

  }

  .context-menu:where([data-density="spacious"]) {

    padding: 0.375rem;

    & .context-menu-item { padding: 0.5rem 0.625rem; }

  }

}

/* Accessibility: suppress motion for users who request it (REQUIRED for all

   components - AGENTS.md "Accessibility CSS"). Near-zero duration instead of

   `none` keeps transitionend/animationend (and discrete display flips)

   firing so JS state machines that await them keep working. */

@media (prefers-reduced-motion: reduce) {

  @layer components {

    .context-menu-trigger,

    .context-menu-trigger *,

    .context-menu-trigger::before,

    .context-menu-trigger::after,

    .context-menu-trigger *::before,

    .context-menu-trigger *::after,

    .context-menu-trigger::backdrop,

    .context-menu,

    .context-menu *,

    .context-menu::before,

    .context-menu::after,

    .context-menu *::before,

    .context-menu *::after,

    .context-menu::backdrop,

    .context-menu-item,

    .context-menu-item *,

    .context-menu-item::before,

    .context-menu-item::after,

    .context-menu-item *::before,

    .context-menu-item *::after,

    .context-menu-item::backdrop,

    .context-menu-separator,

    .context-menu-separator *,

    .context-menu-separator::before,

    .context-menu-separator::after,

    .context-menu-separator *::before,

    .context-menu-separator *::after,

    .context-menu-separator::backdrop {

      transition-duration: 0.01ms !important;

      animation-duration: 0.01ms !important;

      animation-iteration-count: 1 !important;

    }

  }

}

// -- Context Menu ---------------------------------------------

// Right-click context menu using the Popover API, plus the named-state

// API bound per menu popover, so agents/tests can open it without a real

// right-click (AGENTS.md "State API").

// Shared preamble (AGENTS.md "State API"); the implementation lives in core.js —

// build.ts rewrites this import into a df$.shadcn.shared binding in dist/.

import { defussGlobals, safeShowPopover } from '../../shared/state-api.js';

const df$ = defussGlobals();

const contextMenuStates = ['default', 'open'];

/** Like a native menu: where there is no room right of / below the point,

 * open toward its other side, and never past the viewport. Measured right

 * after the (usually synchronous) show - else once the deferred show lands. */

function keepInView(menu, x, y) {

  const fit = () => {

    const w = menu.offsetWidth, h = menu.offsetHeight;

    const vw = document.documentElement.clientWidth, vh = document.documentElement.clientHeight;

    if (x + w > vw - 4) menu.style.left = `${Math.max(4, Math.min(x - w, vw - w - 4))}px`;

    if (y + h > vh - 4) menu.style.top = `${Math.max(4, Math.min(y - h, vh - h - 4))}px`;

  };

  if (menu.matches(':popover-open')) fit();

  else menu.addEventListener('toggle', (e) => { if (e.newState === 'open') fit(); }, { once: true });

}

/**

 * UI side of setState (per menu popover): 'open' shows the menu at { x, y }

 * (falling back to the top-left of the viewport - there is no pointer event

 * to anchor to); 'default' hides it.

 */

function triggerStateChange(menu, stateName, config) {

  switch (stateName) {

    case 'default':

      menu.hidePopover();

      break;

    case 'open': {

      const x = Number(config?.x ?? 8);

      const y = Number(config?.y ?? 8);

      menu.style.position = 'fixed';

      menu.style.top = `${y}px`;

      menu.style.left = `${x}px`;

      // deferred show: showPopover() while a previous exit transition is

      // still running crashes the headless renderer (setState after Escape)

      safeShowPopover(menu);

      keepInView(menu, x, y);

      break;

    }

  }

}

/** Registry-level API; pass the menu popover explicitly. Unknown names throw. */

export const contextMenuApi = {

  setState(menu, stateName, config = {}) {

    if (!contextMenuStates.includes(stateName)) {

      throw new Error(`context-menu: unknown state "${stateName}" (supported: ${contextMenuStates.join(', ')})`);

    }

    triggerStateChange(menu, stateName, config);

    // state lives on the ELEMENT, not the module (many menus per page)

    menu.dataset.stateName = stateName;

    menu._stateConfig = config;

  },

  getState(menu) {

    // reflect reality: right-clicks and item clicks change the UI too

    return {

      name: menu.matches(':popover-open') ? 'open' : 'default',

      config: menu._stateConfig ?? {},

    };

  },

};

df$.contextMenuApi = contextMenuApi;

df$.contextMenuStates = contextMenuStates;

/* One pending open across all triggers: { menu, x, y } captured on the

   contextmenu event, consumed on the right-button pointerup. */

let pendingOpen = null;

/* Timestamp of the last right-button release (0 = never, i.e. page start) —

   see the contextmenu handler: the gesture normally fires contextmenu at

   button-DOWN (open must wait for the release), but some engines dispatch it

   AFTER the pointerup - then the gesture is already over and opening is safe. */

let lastRightUp = 0;

/* Document-level open-on-release - registered once (AGENTS.md delegation

   pattern). WHY release and not the contextmenu event itself: macOS fires

   contextmenu at mouse-DOWN, and an auto popover shown while the right button

   is still held is light-dismissed by the platform the moment it goes up —

   the menu flashed open and vanished on mouse-up (verified in Chromium). */

if (!document.__ctxMenuReleaseInit) {

  document.__ctxMenuReleaseInit = true;

  document.addEventListener('pointerup', (e) => {

    if (e.button !== 2) return;

    lastRightUp = performance.now();

    if (!pendingOpen) return;

    const { menu, x, y } = pendingOpen;

    pendingOpen = null;

    openMenuAt(menu, x, y);

  });

  document.addEventListener('pointercancel', () => { pendingOpen = null; });

}

/** Show a context menu fixed at the pointer coords. */

function openMenuAt(menu, x, y) {

  menu.style.position = 'fixed';

  menu.style.top = `${y}px`;

  menu.style.left = `${x}px`;

  safeShowPopover(menu);

  keepInView(menu, x, y);

  menu.dataset.stateName = 'open';

}

function init() {

  document.querySelectorAll('[data-context-menu]:not([data-init])').forEach((trigger) => {

  trigger.dataset.init = '';

  const menu = document.getElementById(trigger.dataset.contextMenu);

  if (!menu) return;

  // bind-scope the api per menu popover: `$('#my-ctx').api.setState('open', { x: 40, y: 40 })`

  menu.api = {

    setState: (stateName, config) => contextMenuApi.setState(menu, stateName, config),

    getState: () => contextMenuApi.getState(menu),

  };

  trigger.addEventListener('contextmenu', (e) => {

    e.preventDefault();

    // no pointer press (keyboard-synthesized, e.g. a11y tooling) → open next frame

    if (e.pointerId === undefined || e.pointerId < 0) {

      requestAnimationFrame(() => openMenuAt(menu, e.clientX, e.clientY));

      return;

    }

    // right-button already released (gesture order: pointerup → contextmenu)

    // → opening now can't be light-dismissed. lastRightUp===0 (page never saw a

    // right release) must NOT qualify - otherwise early page loads take this

    // branch for a still-held button (0 - now is meaningless).

    if (lastRightUp > 0 && performance.now() - lastRightUp < 100) {

      openMenuAt(menu, e.clientX, e.clientY);

      return;

    }

    pendingOpen = { menu, x: e.clientX, y: e.clientY };

  });

  menu.addEventListener('click', (e) => {

    if (e.target.closest('.context-menu-item')) {

      menu.hidePopover();

      menu.dataset.stateName = 'default';

    }

  });

  // right out of the top layer via Escape: keep the named state honest

  menu.addEventListener('toggle', (e) => {

    if (e.newState === 'closed') menu.dataset.stateName = 'default';

  });

});

}

init();

new MutationObserver(init).observe(document, { childList: true, subtree: true });