77 lines
2.6 KiB
JavaScript
77 lines
2.6 KiB
JavaScript
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// CodeMirror, copyright (c) by Marijn Haverbeke and others
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// Distributed under an MIT license: http://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(className) {
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return new Annotation(this, className);
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});
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function Annotation(cm, className) {
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this.cm = cm;
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this.className = className;
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this.annotations = [];
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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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var self = this;
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cm.on("refresh", this.resizeHandler = function(){
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if (self.computeScale()) self.redraw();
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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) /
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cm.heightAtLine(cm.lastLine() + 1, "local");
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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() {
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var cm = this.cm, hScale = this.hScale;
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if (!cm.display.barWidth) return;
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var frag = document.createDocumentFragment(), anns = this.annotations;
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for (var i = 0, nextTop; i < anns.length; i++) {
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var ann = anns[i];
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var top = nextTop || cm.charCoords(ann.from, "local").top * hScale;
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var bottom = cm.charCoords(ann.to, "local").bottom * hScale;
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while (i < anns.length - 1) {
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nextTop = cm.charCoords(anns[i + 1].from, "local").top * hScale;
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if (nextTop > bottom + .9) break;
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ann = anns[++i];
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bottom = cm.charCoords(ann.to, "local").bottom * hScale;
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}
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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: " + top + "px; height: " + height + "px";
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elt.className = this.className;
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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.div.parentNode.removeChild(this.div);
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};
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});
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