function onWindowKeyPress()

in suite/chatzilla/content/handlers.js [570:721]

• 109 lines of code
• 65 McCabe index (conditional complexity)

function onWindowKeyPress(e) {
  var code = Number(e.keyCode);
  var w;
  var newOfs;
  var userList = document.getElementById("user-list");
  var elemFocused = document.commandDispatcher.focusedElement;

  const isMac = client.platform == "Mac";
  const isLinux = client.platform == "Linux";
  const isWindows = client.platform == "Windows";
  const isOS2 = client.platform == "OS/2";
  const isUnknown = !(isMac || isLinux || isWindows || isOS2);

  switch (code) {
    case 9 /* Tab */:
      // Control-Tab => next tab (all platforms)
      // Control-Shift-Tab => previous tab (all platforms)
      if (e.ctrlKey && !e.altKey && !e.metaKey) {
        cycleView(e.shiftKey ? -1 : 1);
        e.preventDefault();
      }
      break;

    case 33: /* Page Up */
    case 34 /* Page Down */:
      // Control-Page Up => previous tab (all platforms)
      // Control-Page Down => next tab (all platforms)
      if (
        (e.ctrlKey && !e.altKey && !e.metaKey && !e.shiftKey) ||
        (e.altKey && !e.ctrlKey && !e.metaKey && !e.shiftKey)
      ) {
        cycleView(2 * code - 67);
        e.preventDefault();
        break;
      }

      if (
        !e.ctrlKey &&
        !e.altKey &&
        !e.metaKey &&
        !e.shiftKey &&
        elemFocused != userList
      ) {
        w = client.currentFrame;
        newOfs = w.pageYOffset + w.innerHeight * 0.75 * (2 * code - 67);
        if (newOfs > 0) {
          w.scrollTo(w.pageXOffset, newOfs);
        } else {
          w.scrollTo(w.pageXOffset, 0);
        }
        e.preventDefault();
      }
      break;

    case 37: /* Left Arrow */
    case 39 /* Right Arrow */:
      // Command-Alt-Left Arrow => previous tab (Mac only)
      // Command-Alt-Right Arrow => next tab (Mac only)
      if (isMac && e.metaKey && e.altKey && !e.ctrlKey && !e.shiftKey) {
        cycleView(code - 38);
        e.preventDefault();
      }
      break;

    case 219: /* [ */
    case 221 /* ] */:
      // Command-Shift-[ => previous tab (Mac only)
      // Command-Shift-] => next tab (Mac only)
      if (isMac && e.metaKey && e.shiftKey && !e.altKey && !e.ctrlKey) {
        cycleView(code - 220);
        e.preventDefault();
      }
      break;

    case 117 /* F6 */:
      // F6 => focus next (all platforms)
      // Shift-F6 => focus previous (all platforms)
      if (!e.altKey && !e.ctrlKey && !e.metaKey) {
        advanceKeyboardFocus(e.shiftKey ? -1 : 1);
        e.preventDefault();
      }
      break;
  }

  // Code is zero if we have a typeable character triggering the event.
  if (code != 0) {
    return;
  }

  // OS X only: Command-{ and Command-}
  // Newer geckos seem to only provide these keys in charCode, not keyCode
  if (isMac && e.metaKey && e.shiftKey && !e.altKey && !e.ctrlKey) {
    if (e.charCode == 123 || e.charCode == 125) {
      cycleView(e.charCode - 124);
      e.preventDefault();
      return;
    }
  }

  // Numeric shortcuts

  // The following code is copied from:
  //   /mozilla/browser/base/content/browser.js
  //   Revision: 1.748
  //   Lines: 1397-1421

  // \d in a RegExp will find any Unicode character with the "decimal digit"
  // property (Nd)
  var regExp = /\d/;
  if (!regExp.test(String.fromCharCode(e.charCode))) {
    return;
  }

  // Some Unicode decimal digits are in the range U+xxx0 - U+xxx9 and some are
  // in the range U+xxx6 - U+xxxF. Find the digit 1 corresponding to our
  // character.
  var digit1 = (e.charCode & 0xfff0) | 1;
  if (!regExp.test(String.fromCharCode(digit1))) {
    digit1 += 6;
  }

  var idx = e.charCode - digit1;

  if (0 <= idx && idx <= 8) {
    var modifier =
      (e.altKey ? 0x1 : 0) |
      (e.ctrlKey ? 0x2 : 0) |
      (e.shiftKey ? 0x4 : 0) |
      (e.metaKey ? 0x8 : 0);

    var modifierMask;
    if (client.prefs.tabGotoKeyModifiers) {
      modifierMask = client.prefs.tabGotoKeyModifiers;
    } else {
      modifierMask = 0x1;
    } // alt

    if ((modifier & modifierMask) == modifierMask) {
      // Pressing 1-8 takes you to that tab, while pressing 9 takes you
      // to the last tab always.
      if (idx == 8) {
        idx = client.viewsArray.length - 1;
      }

      if (idx in client.viewsArray && client.viewsArray[idx].source) {
        var newView = client.viewsArray[idx].source;
        dispatch("set-current-view", { view: newView });
      }
      e.preventDefault();
    }
  }
}