Function gutterEvent

static/libs/codemirror.js:7537–7564

(cm, e, type, prevent)

// Determines whether an event happened in the gutter, and fires the
// handlers for the corresponding event.
function gutterEvent(cm, e, type, prevent) {
  var mX, mY;
  if (e.touches) {
    mX = e.touches[0].clientX;
    mY = e.touches[0].clientY;
  } else {
    try { mX = e.clientX; mY = e.clientY; }
    catch(e) { return false }
  }
  if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }
  if (prevent) { e_preventDefault(e); }

  var display = cm.display;
  var lineBox = display.lineDiv.getBoundingClientRect();

  if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }
  mY -= lineBox.top - display.viewOffset;

  for (var i = 0; i < cm.options.gutters.length; ++i) {
    var g = display.gutters.childNodes[i];
    if (g && g.getBoundingClientRect().right >= mX) {
      var line = lineAtHeight(cm.doc, mY);
      var gutter = cm.options.gutters[i];
      signal(cm, type, cm, line, gutter, e);
      return e_defaultPrevented(e)
    }
  }
}

function clickInGutter(cm, e) {
  return gutterEvent(cm, e, "gutterClick", true)