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   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"), require("./foldcode"));
   7    else if (typeof define == "function" && define.amd) // AMD
   8      define(["../../lib/codemirror", "./foldcode"], mod);
   9    else // Plain browser env
  10      mod(CodeMirror);
  11  })(function(CodeMirror) {
  12    "use strict";
  13  
  14    CodeMirror.defineOption("foldGutter", false, function(cm, val, old) {
  15      if (old && old != CodeMirror.Init) {
  16        cm.clearGutter(cm.state.foldGutter.options.gutter);
  17        cm.state.foldGutter = null;
  18        cm.off("gutterClick", onGutterClick);
  19        cm.off("change", onChange);
  20        cm.off("viewportChange", onViewportChange);
  21        cm.off("fold", onFold);
  22        cm.off("unfold", onFold);
  23        cm.off("swapDoc", onChange);
  24      }
  25      if (val) {
  26        cm.state.foldGutter = new State(parseOptions(val));
  27        updateInViewport(cm);
  28        cm.on("gutterClick", onGutterClick);
  29        cm.on("change", onChange);
  30        cm.on("viewportChange", onViewportChange);
  31        cm.on("fold", onFold);
  32        cm.on("unfold", onFold);
  33        cm.on("swapDoc", onChange);
  34      }
  35    });
  36  
  37    var Pos = CodeMirror.Pos;
  38  
  39    function State(options) {
  40      this.options = options;
  41      this.from = this.to = 0;
  42    }
  43  
  44    function parseOptions(opts) {
  45      if (opts === true) opts = {};
  46      if (opts.gutter == null) opts.gutter = "CodeMirror-foldgutter";
  47      if (opts.indicatorOpen == null) opts.indicatorOpen = "CodeMirror-foldgutter-open";
  48      if (opts.indicatorFolded == null) opts.indicatorFolded = "CodeMirror-foldgutter-folded";
  49      return opts;
  50    }
  51  
  52    function isFolded(cm, line) {
  53      var marks = cm.findMarks(Pos(line, 0), Pos(line + 1, 0));
  54      for (var i = 0; i < marks.length; ++i)
  55        if (marks[i].__isFold && marks[i].find().from.line == line) return marks[i];
  56    }
  57  
  58    function marker(spec) {
  59      if (typeof spec == "string") {
  60        var elt = document.createElement("div");
  61        elt.className = spec + " CodeMirror-guttermarker-subtle";
  62        return elt;
  63      } else {
  64        return spec.cloneNode(true);
  65      }
  66    }
  67  
  68    function updateFoldInfo(cm, from, to) {
  69      var opts = cm.state.foldGutter.options, cur = from;
  70      var minSize = cm.foldOption(opts, "minFoldSize");
  71      var func = cm.foldOption(opts, "rangeFinder");
  72      cm.eachLine(from, to, function(line) {
  73        var mark = null;
  74        if (isFolded(cm, cur)) {
  75          mark = marker(opts.indicatorFolded);
  76        } else {
  77          var pos = Pos(cur, 0);
  78          var range = func && func(cm, pos);
  79          if (range && range.to.line - range.from.line >= minSize)
  80            mark = marker(opts.indicatorOpen);
  81        }
  82        cm.setGutterMarker(line, opts.gutter, mark);
  83        ++cur;
  84      });
  85    }
  86  
  87    function updateInViewport(cm) {
  88      var vp = cm.getViewport(), state = cm.state.foldGutter;
  89      if (!state) return;
  90      cm.operation(function() {
  91        updateFoldInfo(cm, vp.from, vp.to);
  92      });
  93      state.from = vp.from; state.to = vp.to;
  94    }
  95  
  96    function onGutterClick(cm, line, gutter) {
  97      var state = cm.state.foldGutter;
  98      if (!state) return;
  99      var opts = state.options;
 100      if (gutter != opts.gutter) return;
 101      var folded = isFolded(cm, line);
 102      if (folded) folded.clear();
 103      else cm.foldCode(Pos(line, 0), opts.rangeFinder);
 104    }
 105  
 106    function onChange(cm) {
 107      var state = cm.state.foldGutter;
 108      if (!state) return;
 109      var opts = state.options;
 110      state.from = state.to = 0;
 111      clearTimeout(state.changeUpdate);
 112      state.changeUpdate = setTimeout(function() { updateInViewport(cm); }, opts.foldOnChangeTimeSpan || 600);
 113    }
 114  
 115    function onViewportChange(cm) {
 116      var state = cm.state.foldGutter;
 117      if (!state) return;
 118      var opts = state.options;
 119      clearTimeout(state.changeUpdate);
 120      state.changeUpdate = setTimeout(function() {
 121        var vp = cm.getViewport();
 122        if (state.from == state.to || vp.from - state.to > 20 || state.from - vp.to > 20) {
 123          updateInViewport(cm);
 124        } else {
 125          cm.operation(function() {
 126            if (vp.from < state.from) {
 127              updateFoldInfo(cm, vp.from, state.from);
 128              state.from = vp.from;
 129            }
 130            if (vp.to > state.to) {
 131              updateFoldInfo(cm, state.to, vp.to);
 132              state.to = vp.to;
 133            }
 134          });
 135        }
 136      }, opts.updateViewportTimeSpan || 400);
 137    }
 138  
 139    function onFold(cm, from) {
 140      var state = cm.state.foldGutter;
 141      if (!state) return;
 142      var line = from.line;
 143      if (line >= state.from && line < state.to)
 144        updateFoldInfo(cm, line, line + 1);
 145    }
 146  });