active-line.js
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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE
(function(mod) {
if (typeof exports == "object" && typeof module == "object") // CommonJS
mod(require("../../lib/codemirror"));
else if (typeof define == "function" && define.amd) // AMD
define(["../../lib/codemirror"], mod);
else // Plain browser env
mod(CodeMirror);
})(function(CodeMirror) {
"use strict";
var WRAP_CLASS = "CodeMirror-activeline";
var BACK_CLASS = "CodeMirror-activeline-background";
var GUTT_CLASS = "CodeMirror-activeline-gutter";
CodeMirror.defineOption("styleActiveLine", false, function(cm, val, old) {
var prev = old == CodeMirror.Init ? false : old;
if (val == prev) return
if (prev) {
cm.off("beforeSelectionChange", selectionChange);
clearActiveLines(cm);
delete cm.state.activeLines;
}
if (val) {
cm.state.activeLines = [];
updateActiveLines(cm, cm.listSelections());
cm.on("beforeSelectionChange", selectionChange);
}
});
function clearActiveLines(cm) {
for (var i = 0; i < cm.state.activeLines.length; i++) {
cm.removeLineClass(cm.state.activeLines[i], "wrap", WRAP_CLASS);
cm.removeLineClass(cm.state.activeLines[i], "background", BACK_CLASS);
cm.removeLineClass(cm.state.activeLines[i], "gutter", GUTT_CLASS);
}
}
function sameArray(a, b) {
if (a.length != b.length) return false;
for (var i = 0; i < a.length; i++)
if (a[i] != b[i]) return false;
return true;
}
function updateActiveLines(cm, ranges) {
var active = [];
for (var i = 0; i < ranges.length; i++) {
var range = ranges[i];
var option = cm.getOption("styleActiveLine");
if (typeof option == "object" && option.nonEmpty ? range.anchor.line != range.head.line : !range.empty())
continue
var line = cm.getLineHandleVisualStart(range.head.line);
if (active[active.length - 1] != line) active.push(line);
}
if (sameArray(cm.state.activeLines, active)) return;
cm.operation(function() {
clearActiveLines(cm);
for (var i = 0; i < active.length; i++) {
cm.addLineClass(active[i], "wrap", WRAP_CLASS);
cm.addLineClass(active[i], "background", BACK_CLASS);
cm.addLineClass(active[i], "gutter", GUTT_CLASS);
}
cm.state.activeLines = active;
});
}
function selectionChange(cm, sel) {
updateActiveLines(cm, sel.ranges);
}
});