src/main/webapp/plugins/editor.md/lib/codemirror/addon/scroll/annotatescrollbar.js

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";

  CodeMirror.defineExtension("annotateScrollbar", function(options) {
    if (typeof options == "string") options = {className: options};
    return new Annotation(this, options);
  });

  CodeMirror.defineOption("scrollButtonHeight", 0);

  function Annotation(cm, options) {
    this.cm = cm;
    this.options = options;
    this.buttonHeight = options.scrollButtonHeight || cm.getOption("scrollButtonHeight");
    this.annotations = [];
    this.doRedraw = this.doUpdate = null;
    this.div = cm.getWrapperElement().appendChild(document.createElement("div"));
    this.div.style.cssText = "position: absolute; right: 0; top: 0; z-index: 7; pointer-events: none";
    this.computeScale();

    function scheduleRedraw(delay) {
      clearTimeout(self.doRedraw);
      self.doRedraw = setTimeout(function() { self.redraw(); }, delay);
    }

    var self = this;
    cm.on("refresh", this.resizeHandler = function() {
      clearTimeout(self.doUpdate);
      self.doUpdate = setTimeout(function() {
        if (self.computeScale()) scheduleRedraw(20);
      }, 100);
    });
    cm.on("markerAdded", this.resizeHandler);
    cm.on("markerCleared", this.resizeHandler);
    if (options.listenForChanges !== false)
      cm.on("change", this.changeHandler = function() {
        scheduleRedraw(250);
      });
  }

  Annotation.prototype.computeScale = function() {
    var cm = this.cm;
    var hScale = (cm.getWrapperElement().clientHeight - cm.display.barHeight - this.buttonHeight * 2) /
      cm.heightAtLine(cm.lastLine() + 1, "local");
    if (hScale != this.hScale) {
      this.hScale = hScale;
      return true;
    }
  };