GPQAPP

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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: https://codemirror.net/LICENSE
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(function(mod) {
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  if (typeof exports == "object" && typeof module == "object") // CommonJS
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    mod(require("../../lib/codemirror"));
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  else if (typeof define == "function" && define.amd) // AMD
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    define(["../../lib/codemirror"], mod);
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  else // Plain browser env
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    mod(CodeMirror);
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})(function(CodeMirror) {
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  "use strict";
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  CodeMirror.defineExtension("annotateScrollbar", function(options) {
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    if (typeof options == "string") options = {className: options};
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    return new Annotation(this, options);
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  });
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  CodeMirror.defineOption("scrollButtonHeight", 0);
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  function Annotation(cm, options) {
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    this.cm = cm;
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    this.options = options;
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    this.buttonHeight = options.scrollButtonHeight || cm.getOption("scrollButtonHeight");
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    this.annotations = [];
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    this.doRedraw = this.doUpdate = null;
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    this.div = cm.getWrapperElement().appendChild(document.createElement("div"));
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    this.div.style.cssText = "position: absolute; right: 0; top: 0; z-index: 7; pointer-events: none";
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    this.computeScale();
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    function scheduleRedraw(delay) {
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      clearTimeout(self.doRedraw);
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      self.doRedraw = setTimeout(function() { self.redraw(); }, delay);
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    }
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    var self = this;
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    cm.on("refresh", this.resizeHandler = function() {
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      clearTimeout(self.doUpdate);
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      self.doUpdate = setTimeout(function() {
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        if (self.computeScale()) scheduleRedraw(20);
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      }, 100);
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    });
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    cm.on("markerAdded", this.resizeHandler);
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    cm.on("markerCleared", this.resizeHandler);
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    if (options.listenForChanges !== false)
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      cm.on("changes", this.changeHandler = function() {
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        scheduleRedraw(250);
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      });
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  }
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  Annotation.prototype.computeScale = function() {
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    var cm = this.cm;
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    var hScale = (cm.getWrapperElement().clientHeight - cm.display.barHeight - this.buttonHeight * 2) /
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      cm.getScrollerElement().scrollHeight
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    if (hScale != this.hScale) {
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      this.hScale = hScale;
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      return true;
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    }
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  };
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  Annotation.prototype.update = function(annotations) {
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    this.annotations = annotations;
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    this.redraw();
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  };
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  Annotation.prototype.redraw = function(compute) {
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    if (compute !== false) this.computeScale();
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    var cm = this.cm, hScale = this.hScale;
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    var frag = document.createDocumentFragment(), anns = this.annotations;
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    var wrapping = cm.getOption("lineWrapping");
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    var singleLineH = wrapping && cm.defaultTextHeight() * 1.5;
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    var curLine = null, curLineObj = null;
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    function getY(pos, top) {
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      if (curLine != pos.line) {
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        curLine = pos.line
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        curLineObj = cm.getLineHandle(pos.line)
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        var visual = cm.getLineHandleVisualStart(curLineObj)
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        if (visual != curLineObj) {
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          curLine = cm.getLineNumber(visual)
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          curLineObj = visual
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        }
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      }
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      if ((curLineObj.widgets && curLineObj.widgets.length) ||
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          (wrapping && curLineObj.height > singleLineH))
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        return cm.charCoords(pos, "local")[top ? "top" : "bottom"];
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      var topY = cm.heightAtLine(curLineObj, "local");
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      return topY + (top ? 0 : curLineObj.height);
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    }
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    var lastLine = cm.lastLine()
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    if (cm.display.barWidth) for (var i = 0, nextTop; i < anns.length; i++) {
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      var ann = anns[i];
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      if (ann.to.line > lastLine) continue;
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      var top = nextTop || getY(ann.from, true) * hScale;
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      var bottom = getY(ann.to, false) * hScale;
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      while (i < anns.length - 1) {
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        if (anns[i + 1].to.line > lastLine) break;
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        nextTop = getY(anns[i + 1].from, true) * hScale;
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        if (nextTop > bottom + .9) break;
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        ann = anns[++i];
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        bottom = getY(ann.to, false) * hScale;
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      }
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      if (bottom == top) continue;
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      var height = Math.max(bottom - top, 3);
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      var elt = frag.appendChild(document.createElement("div"));
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      elt.style.cssText = "position: absolute; right: 0px; width: " + Math.max(cm.display.barWidth - 1, 2) + "px; top: "
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        + (top + this.buttonHeight) + "px; height: " + height + "px";
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      elt.className = this.options.className;
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      if (ann.id) {
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        elt.setAttribute("annotation-id", ann.id);
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      }
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    }
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    this.div.textContent = "";
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    this.div.appendChild(frag);
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  };
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  Annotation.prototype.clear = function() {
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    this.cm.off("refresh", this.resizeHandler);
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    this.cm.off("markerAdded", this.resizeHandler);
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    this.cm.off("markerCleared", this.resizeHandler);
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    if (this.changeHandler) this.cm.off("changes", this.changeHandler);
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    this.div.parentNode.removeChild(this.div);
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  };
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});
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