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