https://otomailer.com/assets/summernote/_old/v2/codemirror/addon/scroll/annotatescrollbar.js

1// CodeMirror, copyright (c) by Marijn Haverbeke and others
2// Distributed under an MIT license: https://codemirror.net/LICENSE
3
4(function(mod) {
5  if (typeof exports == "object" && typeof module == "object") // CommonJS
6    mod(require("../../lib/codemirror"));
7  else if (typeof define == "function" && define.amd) // AMD
8    define(["../../lib/codemirror"], mod);
9  else // Plain browser env
10    mod(CodeMirror);
11})(function(CodeMirror) {
12  "use strict";
13
14  CodeMirror.defineExtension("annotateScrollbar", function(options) {
15    if (typeof options == "string") options = {className: options};
16    return new Annotation(this, options);
17  });
18
19  CodeMirror.defineOption("scrollButtonHeight", 0);
20
21  function Annotation(cm, options) {
22    this.cm = cm;
23    this.options = options;
24    this.buttonHeight = options.scrollButtonHeight || cm.getOption("scrollButtonHeight");
25    this.annotations = [];
26    this.doRedraw = this.doUpdate = null;
27    this.div = cm.getWrapperElement().appendChild(document.createElement("div"));
28    this.div.style.cssText = "position: absolute; right: 0; top: 0; z-index: 7; pointer-events: none";
29    this.computeScale();
30
31    function scheduleRedraw(delay) {
32      clearTimeout(self.doRedraw);
33      self.doRedraw = setTimeout(function() { self.redraw(); }, delay);
34    }
35
36    var self = this;
37    cm.on("refresh", this.resizeHandler = function() {
38      clearTimeout(self.doUpdate);
39      self.doUpdate = setTimeout(function() {
40        if (self.computeScale()) scheduleRedraw(20);
41      }, 100);
42    });
43    cm.on("markerAdded", this.resizeHandler);
44    cm.on("markerCleared", this.resizeHandler);
45    if (options.listenForChanges !== false)
46      cm.on("changes", this.changeHandler = function() {
47        scheduleRedraw(250);
48      });
49  }
50
51  Annotation.prototype.computeScale = function() {
52    var cm = this.cm;
53    var hScale = (cm.getWrapperElement().clientHeight - cm.display.barHeight - this.buttonHeight * 2) /
54      cm.getScrollerElement().scrollHeight
55    if (hScale != this.hScale) {
56      this.hScale = hScale;
57      return true;
58    }
59  };
60
61  Annotation.prototype.update = function(annotations) {
62    this.annotations = annotations;
63    this.redraw();
64  };
65
66  Annotation.prototype.redraw = function(compute) {
67    if (compute !== false) this.computeScale();
68    var cm = this.cm, hScale = this.hScale;
69
70    var frag = document.createDocumentFragment(), anns = this.annotations;
71
72    var wrapping = cm.getOption("lineWrapping");
73    var singleLineH = wrapping && cm.defaultTextHeight() * 1.5;
74    var curLine = null, curLineObj = null;
75
76    function getY(pos, top) {
77      if (curLine != pos.line) {
78        curLine = pos.line
79        curLineObj = cm.getLineHandle(pos.line)
80        var visual = cm.getLineHandleVisualStart(curLineObj)
81        if (visual != curLineObj) {
82          curLine = cm.getLineNumber(visual)
83          curLineObj = visual
84        }
85      }
86      if ((curLineObj.widgets && curLineObj.widgets.length) ||
87          (wrapping && curLineObj.height > singleLineH))
88        return cm.charCoords(pos, "local")[top ? "top" : "bottom"];
89      var topY = cm.heightAtLine(curLineObj, "local");
90      return topY + (top ? 0 : curLineObj.height);
91    }
92
93    var lastLine = cm.lastLine()
94    if (cm.display.barWidth) for (var i = 0, nextTop; i < anns.length; i++) {
95      var ann = anns[i];
96      if (ann.to.line > lastLine) continue;
97      var top = nextTop || getY(ann.from, true) * hScale;
98      var bottom = getY(ann.to, false) * hScale;
99      while (i < anns.length - 1) {
100        if (anns[i + 1].to.line > lastLine) break;
101        nextTop = getY(anns[i + 1].from, true) * hScale;
102        if (nextTop > bottom + .9) break;
103        ann = anns[++i];
104        bottom = getY(ann.to, false) * hScale;
105      }
106      if (bottom == top) continue;
107      var height = Math.max(bottom - top, 3);
108
109      var elt = frag.appendChild(document.createElement("div"));
110      elt.style.cssText = "position: absolute; right: 0px; width: " + Math.max(cm.display.barWidth - 1, 2) + "px; top: "
111        + (top + this.buttonHeight) + "px; height: " + height + "px";
112      elt.className = this.options.className;
113      if (ann.id) {
114        elt.setAttribute("annotation-id", ann.id);
115      }
116    }
117    this.div.textContent = "";
118    this.div.appendChild(frag);
119  };
120
121  Annotation.prototype.clear = function() {
122    this.cm.off("refresh", this.resizeHandler);
123    this.cm.off("markerAdded", this.resizeHandler);
124    this.cm.off("markerCleared", this.resizeHandler);
125    if (this.changeHandler) this.cm.off("changes", this.changeHandler);
126    this.div.parentNode.removeChild(this.div);
127  };
128});