--- /dev/null
+(function() {
+ "use strict";
+
+ CodeMirror.defineOption("foldGutter", false, function(cm, val, old) {
+ if (old && old != CodeMirror.Init) {
+ cm.clearGutter(cm.state.foldGutter.options.gutter);
+ cm.state.foldGutter = null;
+ cm.off("gutterClick", onGutterClick);
+ cm.off("change", onChange);
+ cm.off("viewportChange", onViewportChange);
+ cm.off("fold", onFold);
+ cm.off("unfold", onFold);
+ }
+ if (val) {
+ cm.state.foldGutter = new State(parseOptions(val));
+ updateInViewport(cm);
+ cm.on("gutterClick", onGutterClick);
+ cm.on("change", onChange);
+ cm.on("viewportChange", onViewportChange);
+ cm.on("fold", onFold);
+ cm.on("unfold", onFold);
+ }
+ });
+
+ var Pos = CodeMirror.Pos;
+
+ function State(options) {
+ this.options = options;
+ this.from = this.to = 0;
+ }
+
+ function parseOptions(opts) {
+ if (opts === true) opts = {};
+ if (opts.gutter == null) opts.gutter = "CodeMirror-foldgutter";
+ if (opts.indicatorOpen == null) opts.indicatorOpen = "CodeMirror-foldgutter-open";
+ if (opts.indicatorFolded == null) opts.indicatorFolded = "CodeMirror-foldgutter-folded";
+ return opts;
+ }
+
+ function isFolded(cm, line) {
+ var marks = cm.findMarksAt(Pos(line));
+ for (var i = 0; i < marks.length; ++i)
+ if (marks[i].__isFold && marks[i].find().from.line == line) return true;
+ }
+
+ function marker(spec) {
+ if (typeof spec == "string") {
+ var elt = document.createElement("div");
+ elt.className = spec;
+ return elt;
+ } else {
+ return spec.cloneNode(true);
+ }
+ }
+
+ function updateFoldInfo(cm, from, to) {
+ var opts = cm.state.foldGutter.options, cur = from;
+ cm.eachLine(from, to, function(line) {
+ var mark = null;
+ if (isFolded(cm, cur)) {
+ mark = marker(opts.indicatorFolded);
+ } else {
+ var pos = Pos(cur, 0), func = opts.rangeFinder || cm.getHelper(pos, "fold");
+ var range = func && func(cm, pos);
+ if (range && range.from.line + 1 < range.to.line)
+ mark = marker(opts.indicatorOpen);
+ }
+ cm.setGutterMarker(line, opts.gutter, mark);
+ ++cur;
+ });
+ }
+
+ function updateInViewport(cm) {
+ var vp = cm.getViewport(), state = cm.state.foldGutter;
+ if (!state) return;
+ cm.operation(function() {
+ updateFoldInfo(cm, vp.from, vp.to);
+ });
+ state.from = vp.from; state.to = vp.to;
+ }
+
+ function onGutterClick(cm, line, gutter) {
+ var opts = cm.state.foldGutter.options;
+ if (gutter != opts.gutter) return;
+ cm.foldCode(Pos(line, 0), opts.rangeFinder);
+ }
+
+ function onChange(cm) {
+ var state = cm.state.foldGutter;
+ state.from = state.to = 0;
+ clearTimeout(state.changeUpdate);
+ state.changeUpdate = setTimeout(function() { updateInViewport(cm); }, 600);
+ }
+
+ function onViewportChange(cm) {
+ var state = cm.state.foldGutter;
+ clearTimeout(state.changeUpdate);
+ state.changeUpdate = setTimeout(function() {
+ var vp = cm.getViewport();
+ if (state.from == state.to || vp.from - state.to > 20 || state.from - vp.to > 20) {
+ updateInViewport(cm);
+ } else {
+ cm.operation(function() {
+ if (vp.from < state.from) {
+ updateFoldInfo(cm, vp.from, state.from);
+ state.from = vp.from;
+ }
+ if (vp.to > state.to) {
+ updateFoldInfo(cm, state.to, vp.to);
+ state.to = vp.to;
+ }
+ });
+ }
+ }, 400);
+ }
+
+ function onFold(cm, from) {
+ var state = cm.state.foldGutter, line = from.line;
+ if (line >= state.from && line < state.to)
+ updateFoldInfo(cm, line, line + 1);
+ }
+})();