wcfsetup/install/files/js/3rdParty/codemirror/addon/selection/active-line.js

   1 // Because sometimes you need to style the cursor's line.
   2 //
   3 // Adds an option 'styleActiveLine' which, when enabled, gives the
   4 // active line's wrapping <div> the CSS class "CodeMirror-activeline",
   5 // and gives its background <div> the class "CodeMirror-activeline-background".
   6
   7 (function(mod) {
   8   if (typeof exports == "object" && typeof module == "object") // CommonJS
   9     mod(require("../../lib/codemirror"));
  10   else if (typeof define == "function" && define.amd) // AMD
  11     define(["../../lib/codemirror"], mod);
  12   else // Plain browser env
  13     mod(CodeMirror);
  14 })(function(CodeMirror) {
  15   "use strict";
  16   var WRAP_CLASS = "CodeMirror-activeline";
  17   var BACK_CLASS = "CodeMirror-activeline-background";
  18
  19   CodeMirror.defineOption("styleActiveLine", false, function(cm, val, old) {
  20     var prev = old && old != CodeMirror.Init;
  21     if (val && !prev) {
  22       cm.state.activeLines = [];
  23       updateActiveLines(cm, cm.listSelections());
  24       cm.on("beforeSelectionChange", selectionChange);
  25     } else if (!val && prev) {
  26       cm.off("beforeSelectionChange", selectionChange);
  27       clearActiveLines(cm);
  28       delete cm.state.activeLines;
  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     }
  37   }
  38
  39   function sameArray(a, b) {
  40     if (a.length != b.length) return false;
  41     for (var i = 0; i < a.length; i++)
  42       if (a[i] != b[i]) return false;
  43     return true;
  44   }
  45
  46   function updateActiveLines(cm, ranges) {
  47     var active = [];
  48     for (var i = 0; i < ranges.length; i++) {
  49       var line = cm.getLineHandleVisualStart(ranges[i].head.line);
  50       if (active[active.length - 1] != line) active.push(line);
  51     }
  52     if (sameArray(cm.state.activeLines, active)) return;
  53     cm.operation(function() {
  54       clearActiveLines(cm);
  55       for (var i = 0; i < active.length; i++) {
  56         cm.addLineClass(active[i], "wrap", WRAP_CLASS);
  57         cm.addLineClass(active[i], "background", BACK_CLASS);
  58       }
  59       cm.state.activeLines = active;
  60     });
  61   }
  62
  63   function selectionChange(cm, sel) {
  64     updateActiveLines(cm, sel.ranges);
  65   }
  66 });