retro-desktop-theme/shell/shell.js at main · rampstackco/retro-desktop-theme · GitHub

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/* ==========================================================================
   retro-desktop-theme / shell.js
   --------------------------------------------------------------------------
   The whole shell in one file. Vanilla JS, zero dependencies, and the page
   must remain fully readable without it: everything here is enhancement.
   The contract with shell.css is the `rd-live` class on <html>; every
   behavior and every piece of ARIA this script adds is added here, at
   enhance time, so the no-JS document never claims semantics it cannot
   honor.

   What the script does, in order:
     1. flips the document into live mode
     2. registers every [data-rd-window] and gives it dialog semantics
     3. injects the minimize and close controls (a control that does
        nothing must not exist, so they cannot be static markup)
     4. turns icon and in-content anchors into window openers
     5. manages the pile: open, close, minimize, raise on click
     6. fills the taskbar's open-window list (and only that list; the
        shortcut bar beside it is never touched)
     7. injects the launcher button and runs the programs menu
     8. binds Escape to close the topmost openable
     9. injects the wallpaper button and runs the tray clock

   The window mechanics here are the pilot's, deliberately: the era changes
   the skin and the chrome drawing, not the behavior. Focus is managed at the
   three moments it can be lost: opening a window moves focus into it,
   closing one returns focus to the element that opened it, minimizing one
   moves focus to the window's taskbar entry. There is no focus trap
   anywhere: Tab always walks the whole document, and closed windows leave
   the tab order via display:none.
   ========================================================================== */

(function () {
  "use strict";

  var doc = document;
  var root = doc.documentElement;

  /* 1. Live mode. Everything shell.css does differently, it does under
     this class. If the script fails to run, this line never happens and
     the page stays a page. */
  root.classList.add("rd-live");

  /* ------------------------------------------------------------------
     Window registry.
     openOrder holds open (including minimized) windows, bottom to top.
     ------------------------------------------------------------------ */
  var windows = [];
  var byId = {};
  var openOrder = [];
  var openCount = 0; // total opens ever, drives the cascade offsets

  var Z_BASE = 10; // matches --rd-z-window; stays below --rd-z-chrome (30)

  /* The control glyphs. Square, chunky, drawn on a 10-unit grid because a
     title-bar glyph in this era was a handful of pixels and a hairline
     stroke would be the wrong century. Nothing here is traced from any
     product's iconography. */
  var ICON_MIN =
    '<svg viewBox="0 0 10 10" aria-hidden="true" fill="currentColor">' +
    '<rect x="1" y="7" width="7" height="2"/></svg>';
  var ICON_CLOSE =
    '<svg viewBox="0 0 10 10" aria-hidden="true" fill="none" ' +
    'stroke="currentColor" stroke-width="1.8">' +
    '<path d="M1.5 1.5l7 7M8.5 1.5l-7 7"/></svg>';
  /* The launcher glyph: a two-drawer filing cabinet, which is what the menu
     opens onto here. Original artwork; no flag, no logo, no lozenge. */
  var ICON_LAUNCH =
    '<svg viewBox="0 0 16 16" aria-hidden="true" fill="none" ' +
    'stroke="currentColor" stroke-width="1.4" stroke-linecap="square">' +
    '<rect x="2" y="2" width="12" height="12"/>' +
    '<path d="M2 8h12"/><path d="M6 5h4M6 11h4"/></svg>';
  /* The wallpaper glyph: slats. */
  var ICON_WALL =
    '<svg viewBox="0 0 16 16" aria-hidden="true" fill="none" ' +
    'stroke="currentColor" stroke-width="1.4" stroke-linecap="square">' +
    '<rect x="2" y="2" width="12" height="12"/>' +
    '<path d="M2 6h12M2 10h12"/></svg>';

  /* ------------------------------------------------------------------
     2 + 3. Register windows, add dialog semantics, inject controls.
     Non-modal dialogs: role="dialog" names the pattern, aria-modal is
     deliberately absent because nothing is modal and nothing traps.
     ------------------------------------------------------------------ */
  var winEls = doc.querySelectorAll("[data-rd-window]");
  Array.prototype.forEach.call(winEls, function (el) {
    var title = el.querySelector(".rd-title");
    if (title && !title.id) title.id = el.id + "-title";

    el.setAttribute("role", "dialog");
    if (title) el.setAttribute("aria-labelledby", title.id);
    el.tabIndex = -1;

    var body = el.querySelector(".rd-window-body");
    if (body) {
      /* The scroll region has to be keyboard-scrollable, which means
         focusable. It borrows the window's name so a screen reader says
         what it is scrolling. */
      body.tabIndex = 0;
      if (title) body.setAttribute("aria-labelledby", title.id);
      body.setAttribute("role", "region");
    }

    var slot = el.querySelector("[data-rd-controls]");
    var minBtn = null;
    var closeBtn = null;
    if (slot) {
      var name = taskName(el);
      minBtn = makeControl("Minimize " + name, ICON_MIN);
      closeBtn = makeControl("Close " + name, ICON_CLOSE);
      slot.appendChild(minBtn);
      slot.appendChild(closeBtn);
    }

    var win = {
      el: el,
      id: el.id,
      minimized: false,
      opener: null, // where focus returns on close
      taskBtn: null,
    };
    windows.push(win);
    byId[el.id] = win;

    if (minBtn)
      minBtn.addEventListener("click", function () {
        minimize(win);
      });
    if (closeBtn)
      closeBtn.addEventListener("click", function () {
        close(win);
      });

    /* Clicking anywhere in a window raises it: z-order on click. */
    el.addEventListener("pointerdown", function () {
      if (top() !== win) raise(win);
    });
  });

  /* Window titles read "Read me first - Tambour", the era's document-dash-
     application convention. The taskbar and the control labels want the
     document half only, so the markup carries it explicitly rather than the
     script splitting a string it does not own. */
  function taskName(el) {
    var attr = el.getAttribute("data-rd-task");
    if (attr) return attr;
    var t = el.querySelector(".rd-title");
    return t ? t.textContent.trim() : el.id;
  }

  function makeControl(label, svg) {
    var b = doc.createElement("button");
    b.type = "button";
    b.className = "rd-control";
    b.setAttribute("aria-label", label);
    b.innerHTML = svg;
    return b;
  }

  /* ------------------------------------------------------------------
     4. Anchors become openers. Any link to #<window-id>, wherever it is
     (desktop grid, programs menu, window content), opens that window. The
     same listener closes the menu behind a successful open.
     ------------------------------------------------------------------ */
  doc.addEventListener("click", function (e) {
    var a = e.target.closest ? e.target.closest('a[href^="#"]') : null;
    if (!a) return;
    var win = byId[a.getAttribute("href").slice(1)];
    if (!win) return;
    e.preventDefault();
    setMenu(false, false);
    open(win, a);
  });

  /* ------------------------------------------------------------------
     5. The pile.
     ------------------------------------------------------------------ */
  function top() {
    return openOrder.length ? openOrder[openOrder.length - 1] : null;
  }

  /* The topmost window a user can actually see. A minimized window can sit
     high in the order, and Escape and focus-return must both look past it. */
  function topVisible() {
    for (var i = openOrder.length - 1; i >= 0; i--) {
      if (!openOrder[i].minimized) return openOrder[i];
    }
    return null;
  }

  function place(win) {
    /* The cascade: each opening lands a step down-right from the last,
       cycling so the pile never walks off screen. */
    var step = openCount % 5;
    win.el.style.setProperty("--rd-dx", step * cascade() + "px");
    win.el.style.setProperty("--rd-dy", step * cascade() + "px");
    openCount += 1;
  }

  function open(win, opener) {
    if (opener) win.opener = opener;
    if (openOrder.indexOf(win) === -1) {
      openOrder.push(win);
      place(win);
    }
    win.minimized = false;
    win.el.classList.add("rd-open");
    raise(win);
    win.el.focus({ preventScroll: true });
  }

  function close(win) {
    var i = openOrder.indexOf(win);
    if (i !== -1) openOrder.splice(i, 1);
    win.minimized = false;
    win.el.classList.remove("rd-open", "rd-top");
    restack();
    /* Never a dead end: focus returns to whatever opened the window, and
       the desktop with its icons is what remains. */
    if (win.opener && isVisible(win.opener)) {
      win.opener.focus();
    } else {
      var t = topVisible();
      if (t) t.el.focus({ preventScroll: true });
    }
  }

  function minimize(win) {
    win.minimized = true;
    win.el.classList.remove("rd-open", "rd-top");
    restack();
    /* The window went to the taskbar, so focus honestly follows it. */
    if (win.taskBtn) win.taskBtn.focus();
  }

  function raise(win) {
    var i = openOrder.indexOf(win);
    if (i !== -1) {
      openOrder.splice(i, 1);
      openOrder.push(win);
    }
    restack();
  }

  /* Reassign z-indexes bottom-to-top on every change, so the range stays
     bounded and never creeps toward the chrome layer. */
  function restack() {
    var tv = topVisible();
    openOrder.forEach(function (w, i) {
      w.el.style.zIndex = String(Z_BASE + i);
      w.el.classList.toggle("rd-top", w === tv);
    });
    syncTaskbar();
  }

  function isVisible(el) {
    return !!(el.offsetWidth || el.offsetHeight || el.getClientRects().length);
  }

  function cascade() {
    var v = getComputedStyle(root).getPropertyValue("--rd-cascade");
    return parseInt(v, 10) || 24;
  }

  /* ------------------------------------------------------------------
     6. Taskbar. This fills the open-window list and only that list. The
     shortcut bar next to it is a fixed text index of every window and no
     selector in this file reaches it, which is deliberate: it is the
     navigation guarantee that has to read the same with the script and
     without it (class decision 44). Rebuilding the taskbar used to
     destroy it.

     Click behavior follows the desktop convention this era set: raise it
     if it is behind, restore it if it is minimized, minimize it if it is
     already on top.
     ------------------------------------------------------------------ */
  var tasklist = doc.querySelector("[data-rd-tasklist]");

  function syncTaskbar() {
    if (!tasklist) return;
    tasklist.textContent = "";
    openOrder.forEach(function (win) {
      var li = doc.createElement("li");
      var b = doc.createElement("button");
      b.type = "button";
      b.className = "rd-task" + (win.minimized ? " rd-task-min" : "");
      b.textContent = taskName(win.el);
      var isTop = topVisible() === win;
      b.setAttribute("aria-pressed", isTop ? "true" : "false");
      b.addEventListener("click", function () {
        if (win.minimized) {
          open(win);
        } else if (topVisible() === win) {
          minimize(win);
        } else {
          raise(win);
          win.el.focus({ preventScroll: true });
        }
      });
      li.appendChild(b);
      tasklist.appendChild(li);
      win.taskBtn = b;
    });
  }

  /* ------------------------------------------------------------------
     7. The launcher and the programs menu. The button is injected into the
     taskbar's slot because it only means something live, and it exists at
     every width: in this era the menu button was permanent chrome, not a
     narrow-screen affordance. It controls the icon nav, which shell.css
     re-hangs as a menu standing on the taskbar.

     The label is "Programs", which is what the menu contains. It is
     deliberately not the word the era's best-known desktop used.
     ------------------------------------------------------------------ */
  var icons = doc.querySelector(".rd-icons");
  var launchSlot = doc.querySelector("[data-rd-launcher]");
  var launcher = null;

  if (icons && launchSlot) {
    if (!icons.id) icons.id = "rd-programs";
    launcher = doc.createElement("button");
    launcher.type = "button";
    launcher.className = "rd-launcher";
    launcher.setAttribute("aria-expanded", "false");
    launcher.setAttribute("aria-controls", icons.id);
    launcher.innerHTML = ICON_LAUNCH + "<span>Programs</span>";
    launcher.addEventListener("click", function () {
      setMenu(launcher.getAttribute("aria-expanded") !== "true", true);
    });
    launchSlot.appendChild(launcher);
  }

  function setMenu(openIt, returnFocus) {
    if (!launcher) return;
    var was = launcher.getAttribute("aria-expanded") === "true";
    launcher.setAttribute("aria-expanded", openIt ? "true" : "false");
    icons.classList.toggle("rd-open", openIt);
    if (!openIt && was && returnFocus) launcher.focus();
  }

  /* A menu in this era closed when you clicked away from it. Focus is left
     where the click put it; pulling it back to the launcher would fight the
     user for it. */
  doc.addEventListener("pointerdown", function (e) {
    if (!launcher || launcher.getAttribute("aria-expanded") !== "true") return;
    if (icons.contains(e.target) || launcher.contains(e.target)) return;
    setMenu(false, false);
  });

  /* ------------------------------------------------------------------
     8. Escape closes the topmost openable: the programs menu if it is
     open, otherwise the top visible window. One key, one rule, no
     exceptions. The "visible" part is load-bearing: a minimized window can
     sit at the top of the order, and without topVisible() the key becomes
     a no-op that looks like a bug.
     ------------------------------------------------------------------ */
  doc.addEventListener("keydown", function (e) {
    if (e.key !== "Escape") return;
    if (launcher && launcher.getAttribute("aria-expanded") === "true") {
      setMenu(false, true);
      return;
    }
    var t = topVisible();
    if (t) close(t);
  });

  /* ------------------------------------------------------------------
     9a. Wallpaper. The ground is a wallpaper slot; this script's whole
     involvement is one attribute on the body and one tray button. All the
     styling lives in shell.css under body[data-wallpaper]. The enhanced
     desktop defaults to the flat field, which is what the era's desktop
     was, and it is also what the no-JS document gets from plain CSS.
     Per-session only, no storage: a demo desktop should greet everyone the
     same way.
     ------------------------------------------------------------------ */
  var WALLPAPERS = ["quiet", "slats"];
  doc.body.setAttribute("data-wallpaper", WALLPAPERS[0]);

  var tray = doc.querySelector("[data-rd-tray]");
  if (tray) {
    var wallBtn = doc.createElement("button");
    wallBtn.type = "button";
    wallBtn.className = "rd-tray-btn";
    wallBtn.innerHTML = ICON_WALL;
    var labelWall = function () {
      wallBtn.setAttribute(
        "aria-label",
        "Switch wallpaper, now " + doc.body.getAttribute("data-wallpaper")
      );
    };
    labelWall();
    wallBtn.addEventListener("click", function () {
      var cur = doc.body.getAttribute("data-wallpaper");
      var next = WALLPAPERS[(WALLPAPERS.indexOf(cur) + 1) % WALLPAPERS.length];
      doc.body.setAttribute("data-wallpaper", next);
      labelWall();
    });
    tray.insertBefore(wallBtn, tray.firstChild);
  }

  /* ------------------------------------------------------------------
     9b. The clock. A desktop without a clock is a screenshot.
     ------------------------------------------------------------------ */
  var clock = doc.querySelector("[data-rd-clock]");
  if (clock) {
    var tick = function () {
      var d = new Date();
      var h = String(d.getHours());
      var m = String(d.getMinutes());
      clock.textContent =
        (h.length < 2 ? "0" + h : h) + ":" + (m.length < 2 ? "0" + m : m);
    };
    tick();
    setInterval(tick, 30000);
  }

  /* ------------------------------------------------------------------
     Boot: open whatever the page marked data-rd-open, in document order,
     so the desktop greets rather than sitting empty. The last one marked
     ends up on top. Focus is left alone at boot; stealing focus on page
     load is rude to screen readers and to everyone else.
     ------------------------------------------------------------------ */
  windows.forEach(function (win) {
    if (win.el.hasAttribute("data-rd-open")) {
      var icon = doc.querySelector('.rd-icons a[href="#' + win.id + '"]');
      if (icon) win.opener = icon;
      if (openOrder.indexOf(win) === -1) {
        openOrder.push(win);
        place(win);
      }
      win.el.classList.add("rd-open");
    }
  });
  restack();
})();