Block textbox input for flag keys

Author: nhmkdev

Forms/KeyCaptureConfig.cs

@@ -346,6 +346,10 @@ private void btnStart_Click(object sender, EventArgs e)
 
         private void txtKeyIn_KeyDown(object sender, KeyEventArgs e)
         {
+            if (KeyUtil.IsFlagKey(e.KeyCode))
+            {
+                return;
+            }
 #if LOG_KEYS
             Console.Out.WriteLine("Key Input: {0} 0x{1}".FormatString(e.KeyCode, e.KeyCode.ToString("x")));
 #endif
@@ -355,6 +359,10 @@ private void txtKeyIn_KeyDown(object sender, KeyEventArgs e)
 
         private void txtKeyOut_KeyDown(object sender, KeyEventArgs e)
         {
+            if (KeyUtil.IsFlagKey(e.KeyCode))
+            {
+                return;
+            }
 #if LOG_KEYS
             Console.Out.WriteLine("Key Input: {0} 0x{1}".FormatString(e.KeyCode, e.KeyCode.ToString("x")));
 #endif

Util/KeyUtil.cs

@@ -29,6 +29,21 @@ namespace KeyCap.Util
 {
     static class KeyUtil
     {
+        public static bool IsFlagKey(Keys key)
+        {
+            switch (key)
+            {
+                case Keys.Menu:
+                case Keys.Alt:
+                case Keys.ControlKey:
+                case Keys.Control:
+                case Keys.ShiftKey:
+                case Keys.Shift:
+                    return true;
+            }
+            return false;
+        }
+
         public static byte GetKeyByte(char cInput, ref bool bShift)
         {
             bShift = char.IsUpper(cInput);