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   1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
   2  // Distributed under an MIT license: https://codemirror.net/5/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    var WRAP_CLASS = "CodeMirror-activeline";
  14    var BACK_CLASS = "CodeMirror-activeline-background";
  15    var GUTT_CLASS = "CodeMirror-activeline-gutter";
  16  
  17    CodeMirror.defineOption("styleActiveLine", false, function(cm, val, old) {
  18      var prev = old == CodeMirror.Init ? false : old;
  19      if (val == prev) return
  20      if (prev) {
  21        cm.off("beforeSelectionChange", selectionChange);
  22        clearActiveLines(cm);
  23        delete cm.state.activeLines;
  24      }
  25      if (val) {
  26        cm.state.activeLines = [];
  27        updateActiveLines(cm, cm.listSelections());
  28        cm.on("beforeSelectionChange", selectionChange);
  29      }
  30    });
  31  
  32    function clearActiveLines(cm) {
  33      for (var i = 0; i < cm.state.activeLines.length; i++) {
  34        cm.removeLineClass(cm.state.activeLines[i], "wrap", WRAP_CLASS);
  35        cm.removeLineClass(cm.state.activeLines[i], "background", BACK_CLASS);
  36        cm.removeLineClass(cm.state.activeLines[i], "gutter", GUTT_CLASS);
  37      }
  38    }
  39  
  40    function sameArray(a, b) {
  41      if (a.length != b.length) return false;
  42      for (var i = 0; i < a.length; i++)
  43        if (a[i] != b[i]) return false;
  44      return true;
  45    }
  46  
  47    function updateActiveLines(cm, ranges) {
  48      var active = [];
  49      for (var i = 0; i < ranges.length; i++) {
  50        var range = ranges[i];
  51        var option = cm.getOption("styleActiveLine");
  52        if (typeof option == "object" && option.nonEmpty ? range.anchor.line != range.head.line : !range.empty())
  53          continue
  54        var line = cm.getLineHandleVisualStart(range.head.line);
  55        if (active[active.length - 1] != line) active.push(line);
  56      }
  57      if (sameArray(cm.state.activeLines, active)) return;
  58      cm.operation(function() {
  59        clearActiveLines(cm);
  60        for (var i = 0; i < active.length; i++) {
  61          cm.addLineClass(active[i], "wrap", WRAP_CLASS);
  62          cm.addLineClass(active[i], "background", BACK_CLASS);
  63          cm.addLineClass(active[i], "gutter", GUTT_CLASS);
  64        }
  65        cm.state.activeLines = active;
  66      });
  67    }
  68  
  69    function selectionChange(cm, sel) {
  70      updateActiveLines(cm, sel.ranges);
  71    }
  72  });