diff --git a/Disp/RenderingCanvas.cs b/Disp/RenderingCanvas.cs
index 21c567b..076720d 100644
--- a/Disp/RenderingCanvas.cs
+++ b/Disp/RenderingCanvas.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Windows.Forms;
 using System.Drawing;
 using System.Drawing.Imaging;
@@ -255,36 +255,72 @@ namespace Hi.WinForm.Disp
             return true;
         }
 
+        /// <summary>
+        /// Convert WinForms Keys to W3C KeyboardEvent.key string.
+        /// </summary>
+        static string WinFormsKeyToW3C(Keys key) => (key & Keys.KeyCode) switch
+        {
+            Keys.Home => "Home",
+            Keys.End => "End",
+            Keys.PageUp => "PageUp",
+            Keys.PageDown => "PageDown",
+            Keys.Left => "ArrowLeft",
+            Keys.Right => "ArrowRight",
+            Keys.Up => "ArrowUp",
+            Keys.Down => "ArrowDown",
+            Keys.LShiftKey or Keys.RShiftKey or Keys.ShiftKey => "Shift",
+            Keys.LControlKey or Keys.RControlKey or Keys.ControlKey => "Control",
+            Keys.LMenu or Keys.RMenu or Keys.Menu => "Alt",
+            Keys.Return => "Enter",
+            Keys.Escape => "Escape",
+            Keys.Back => "Backspace",
+            Keys.Tab => "Tab",
+            Keys.Delete => "Delete",
+            Keys.Insert => "Insert",
+            Keys.Space => " ",
+            Keys.F1 => "F1",
+            Keys.F2 => "F2",
+            Keys.F3 => "F3",
+            Keys.F4 => "F4",
+            Keys.F5 => "F5",
+            Keys.F6 => "F6",
+            Keys.F7 => "F7",
+            Keys.F8 => "F8",
+            Keys.F9 => "F9",
+            Keys.F10 => "F10",
+            Keys.F11 => "F11",
+            Keys.F12 => "F12",
+            >= Keys.A and <= Keys.Z => ((char)('a' + ((key & Keys.KeyCode) - Keys.A))).ToString(),
+            >= Keys.D0 and <= Keys.D9 => ((char)('0' + ((key & Keys.KeyCode) - Keys.D0))).ToString(),
+            _ => "Unidentified"
+        };
+
         private void RenderingCanvas_KeyDown(object sender, KeyEventArgs e)
         {
             Focus();
-            DispEngine.KeyDown((long)e.KeyData);
-
-            // Map specific keys for view transformation
-            long key = (long)e.KeyData;
-            if (key == (long)Keys.LShiftKey || key == (long)Keys.RShiftKey || key == (long)Keys.ShiftKey)
-                key = (long)Keys.Shift;
+            string key = WinFormsKeyToW3C(e.KeyData);
+            DispEngine.KeyDown(key);
 
             DispEngine.KeyDownTransform(key, new key_table__transform_view_by_key_pressing_t()
             {
-                HOME = (long)Keys.Home,
-                PAGE_UP = (long)Keys.PageUp,
-                PAGE_DOWN = (long)Keys.PageDown,
-                F1 = (long)Keys.F1,
-                F2 = (long)Keys.F2,
-                F3 = (long)Keys.F3,
-                F4 = (long)Keys.F4,
-                SHIFT = (long)Keys.Shift,
-                ARROW_LEFT = (long)Keys.Left,
-                ARROW_RIGHT = (long)Keys.Right,
-                ARROW_DOWN = (long)Keys.Down,
-                ARROW_UP = (long)Keys.Up
+                HOME = "Home",
+                PAGE_UP = "PageUp",
+                PAGE_DOWN = "PageDown",
+                F1 = "F1",
+                F2 = "F2",
+                F3 = "F3",
+                F4 = "F4",
+                SHIFT = "Shift",
+                ARROW_LEFT = "ArrowLeft",
+                ARROW_RIGHT = "ArrowRight",
+                ARROW_DOWN = "ArrowDown",
+                ARROW_UP = "ArrowUp"
             });
         }
 
         private void RenderingCanvas_KeyUp(object sender, KeyEventArgs e)
         {
-            DispEngine.KeyUp((long)e.KeyData);
+            DispEngine.KeyUp(WinFormsKeyToW3C(e.KeyData));
         }
         #endregion