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// Because sometimes you need to style the cursor's line.
//
// Adds an option 'styleActiveLine' which, when enabled, gives the
// active line's wrapping <div> the CSS class "CodeMirror-activeline",
// and gives its background <div> the class "CodeMirror-activeline-background".
(function() {
"use strict";
var WRAP_CLASS = "CodeMirror-activeline";
var BACK_CLASS = "CodeMirror-activeline-background";
CodeMirror.defineOption("styleActiveLine", false, function(cm, val, old) {
var prev = old && old != CodeMirror.Init;
if (val && !prev) {
updateActiveLine(cm);
cm.on("cursorActivity", updateActiveLine);
} else if (!val && prev) {
cm.off("cursorActivity", updateActiveLine);
clearActiveLine(cm);
delete cm._activeLine;
}
});
function clearActiveLine(cm) {
if ("_activeLine" in cm) {
cm.removeLineClass(cm._activeLine, "wrap", WRAP_CLASS);
cm.removeLineClass(cm._activeLine, "background", BACK_CLASS);
}
}
function updateActiveLine(cm) {
var line = cm.getLineHandle(cm.getCursor().line);
if (cm._activeLine == line) return;
clearActiveLine(cm);
cm.addLineClass(line, "wrap", WRAP_CLASS);
cm.addLineClass(line, "background", BACK_CLASS);
cm._activeLine = line;
}
})();
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