101 lines
3.6 KiB
JavaScript
101 lines
3.6 KiB
JavaScript
// 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(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("change", 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.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(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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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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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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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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}
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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("change", this.changeHandler);
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this.div.parentNode.removeChild(this.div);
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};
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});
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