move a few things away in to-be-integrated/

[myslice.git] / to-be-integrated / third-party / codemirror-3.15 / addon / selection / active-line.js

diff --git a/to-be-integrated/third-party/codemirror-3.15/addon/selection/active-line.js b/to-be-integrated/third-party/codemirror-3.15/addon/selection/active-line.js
new file mode 100644 (file)
index 0000000..e505086
--- /dev/null
+++ b/to-be-integrated/third-party/codemirror-3.15/addon/selection/active-line.js
@@ -0,0 +1,39 @@
+// 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.state.activeLine;
+    }
+  });
+
+  function clearActiveLine(cm) {
+    if ("activeLine" in cm.state) {
+      cm.removeLineClass(cm.state.activeLine, "wrap", WRAP_CLASS);
+      cm.removeLineClass(cm.state.activeLine, "background", BACK_CLASS);
+    }
+  }
+
+  function updateActiveLine(cm) {
+    var line = cm.getLineHandleVisualStart(cm.getCursor().line);
+    if (cm.state.activeLine == line) return;
+    clearActiveLine(cm);
+    cm.addLineClass(line, "wrap", WRAP_CLASS);
+    cm.addLineClass(line, "background", BACK_CLASS);
+    cm.state.activeLine = line;
+  }
+})();