添加项目文件。

Szmedi.RvKits/ScriptPad/editor/CodeEditorReactiveExtensions.cs

@@ -0,0 +1,29 @@
+using System.Reactive.Linq;
+using System;
+using ICSharpCode.AvalonEdit.Editing;
+using System.Windows.Input;
+using ICSharpCode.AvalonEdit;
+
+namespace ScriptPad.Editor
+{
+    static class CodeEditorReactiveExtensions
+    {
+        public static IObservable<TextCompositionEventArgs> GetTextEnterings(this TextArea textArea)
+        {
+            return Observable.FromEventPattern<TextCompositionEventArgs>(textArea, nameof(textArea.TextEntering))
+                .Select(p => p.EventArgs);
+        }
+
+        public static IObservable<TextCompositionEventArgs> GetTextEntereds(this TextArea textArea)
+        {
+            return Observable.FromEventPattern<TextCompositionEventArgs>(textArea, nameof(textArea.TextEntered))
+                .Select(p => p.EventArgs);
+        }
+
+        public static IObservable<EventArgs> GetTextChangeds(this TextEditor editor)
+        {
+            return Observable.FromEventPattern<EventArgs>(editor, nameof(editor.TextChanged))
+                .Select(p => p.EventArgs);
+        }
+    }
+}