annotatescrollbar.js
123 lines
| 1 | // CodeMirror, copyright (c) by Marijn Haverbeke and others |
| 2 | // Distributed under an MIT license: http://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("change", 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 | function getY(pos, top) { |
| 76 | if (curLine != pos.line) { |
| 77 | curLine = pos.line; |
| 78 | curLineObj = cm.getLineHandle(curLine); |
| 79 | } |
| 80 | if ((curLineObj.widgets && curLineObj.widgets.length) || |
| 81 | (wrapping && curLineObj.height > singleLineH)) |
| 82 | return cm.charCoords(pos, "local")[top ? "top" : "bottom"]; |
| 83 | var topY = cm.heightAtLine(curLineObj, "local"); |
| 84 | return topY + (top ? 0 : curLineObj.height); |
| 85 | } |
| 86 | |
| 87 | var lastLine = cm.lastLine() |
| 88 | if (cm.display.barWidth) for (var i = 0, nextTop; i < anns.length; i++) { |
| 89 | var ann = anns[i]; |
| 90 | if (ann.to.line > lastLine) continue; |
| 91 | var top = nextTop || getY(ann.from, true) * hScale; |
| 92 | var bottom = getY(ann.to, false) * hScale; |
| 93 | while (i < anns.length - 1) { |
| 94 | if (anns[i + 1].to.line > lastLine) break; |
| 95 | nextTop = getY(anns[i + 1].from, true) * hScale; |
| 96 | if (nextTop > bottom + .9) break; |
| 97 | ann = anns[++i]; |
| 98 | bottom = getY(ann.to, false) * hScale; |
| 99 | } |
| 100 | if (bottom == top) continue; |
| 101 | var height = Math.max(bottom - top, 3); |
| 102 | |
| 103 | var elt = frag.appendChild(document.createElement("div")); |
| 104 | elt.style.cssText = "position: absolute; right: 0px; width: " + Math.max(cm.display.barWidth - 1, 2) + "px; top: " |
| 105 | + (top + this.buttonHeight) + "px; height: " + height + "px"; |
| 106 | elt.className = this.options.className; |
| 107 | if (ann.id) { |
| 108 | elt.setAttribute("annotation-id", ann.id); |
| 109 | } |
| 110 | } |
| 111 | this.div.textContent = ""; |
| 112 | this.div.appendChild(frag); |
| 113 | }; |
| 114 | |
| 115 | Annotation.prototype.clear = function() { |
| 116 | this.cm.off("refresh", this.resizeHandler); |
| 117 | this.cm.off("markerAdded", this.resizeHandler); |
| 118 | this.cm.off("markerCleared", this.resizeHandler); |
| 119 | if (this.changeHandler) this.cm.off("change", this.changeHandler); |
| 120 | this.div.parentNode.removeChild(this.div); |
| 121 | }; |
| 122 | }); |
| 123 |