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