Function posFromMouse

mini-code-edit/cm/lib/codemirror.js:1671–1682

(e, liberal)

    function paddingLeft() {return lineSpace.offsetLeft;}

    function posFromMouse(e, liberal) {
      var offW = eltOffset(scroller, true), x, y;
      // Fails unpredictably on IE[67] when mouse is dragged around quickly.
      try { x = e.clientX; y = e.clientY; } catch (e) { return null; }
      // This is a mess of a heuristic to try and determine whether a
      // scroll-bar was clicked or not, and to return null if one was
      // (and !liberal).
      if (!liberal && (x - offW.left > scroller.clientWidth || y - offW.top > scroller.clientHeight))
        return null;
      var offL = eltOffset(lineSpace, true);
      return coordsChar(x - offL.left, y - offL.top);
    }
    function onContextMenu(e) {
      var pos = posFromMouse(e), scrollPos = scroller.scrollTop;
      if (!pos || window.opera) return; // Opera is difficult.