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1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
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2 // Distributed under an MIT license: http://codemirror.net/LICENSE
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3
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4 // Because sometimes you need to style the cursor's line.
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5 //
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6 // Adds an option 'styleActiveLine' which, when enabled, gives the
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7 // active line's wrapping <div> the CSS class "CodeMirror-activeline",
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8 // and gives its background <div> the class "CodeMirror-activeline-background".
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9
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10 (function(mod) {
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11 if (typeof exports == "object" && typeof module == "object") // CommonJS
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12 mod(require("../../lib/codemirror"));
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13 else if (typeof define == "function" && define.amd) // AMD
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14 define(["../../lib/codemirror"], mod);
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15 else // Plain browser env
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16 mod(CodeMirror);
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17 })(function(CodeMirror) {
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18 "use strict";
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19 var WRAP_CLASS = "CodeMirror-activeline";
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20 var BACK_CLASS = "CodeMirror-activeline-background";
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21 var GUTT_CLASS = "CodeMirror-activeline-gutter";
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22
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23 CodeMirror.defineOption("styleActiveLine", false, function(cm, val, old) {
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24 var prev = old && old != CodeMirror.Init;
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25 if (val && !prev) {
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26 cm.state.activeLines = [];
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27 updateActiveLines(cm, cm.listSelections());
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28 cm.on("beforeSelectionChange", selectionChange);
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29 } else if (!val && prev) {
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30 cm.off("beforeSelectionChange", selectionChange);
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31 clearActiveLines(cm);
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32 delete cm.state.activeLines;
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33 }
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34 });
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35
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36 function clearActiveLines(cm) {
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37 for (var i = 0; i < cm.state.activeLines.length; i++) {
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38 cm.removeLineClass(cm.state.activeLines[i], "wrap", WRAP_CLASS);
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39 cm.removeLineClass(cm.state.activeLines[i], "background", BACK_CLASS);
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40 cm.removeLineClass(cm.state.activeLines[i], "gutter", GUTT_CLASS);
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41 }
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42 }
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43
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44 function sameArray(a, b) {
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45 if (a.length != b.length) return false;
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46 for (var i = 0; i < a.length; i++)
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47 if (a[i] != b[i]) return false;
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48 return true;
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49 }
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50
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51 function updateActiveLines(cm, ranges) {
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52 var active = [];
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53 for (var i = 0; i < ranges.length; i++) {
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54 var range = ranges[i];
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55 if (!range.empty()) continue;
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56 var line = cm.getLineHandleVisualStart(range.head.line);
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57 if (active[active.length - 1] != line) active.push(line);
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58 }
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59 if (sameArray(cm.state.activeLines, active)) return;
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60 cm.operation(function() {
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61 clearActiveLines(cm);
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62 for (var i = 0; i < active.length; i++) {
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63 cm.addLineClass(active[i], "wrap", WRAP_CLASS);
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64 cm.addLineClass(active[i], "background", BACK_CLASS);
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65 cm.addLineClass(active[i], "gutter", GUTT_CLASS);
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66 }
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67 cm.state.activeLines = active;
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68 });
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69 }
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70
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71 function selectionChange(cm, sel) {
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72 updateActiveLines(cm, sel.ranges);
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73 }
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74 });
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