Question

I have some menus that contain many menuitems. Mouse wheel doesn’t scroll them. I have to use the keyboard arrows or click the arrows at top and bottom.
Is it possible to use the mouse wheel to scroll toolstrip menu items?
Thanks

Answer 1

A working solution:

1. Register for MouseWheel event of your form and DropDownClosed event of your root MenuStripItem (here, rootItem) in the Load event of the form

       this.MouseWheel += Form3_MouseWheel;
       rootItem.DropDownOpened += rootItem_DropDownOpened;
       rootItem.DropDownClosed += rootItem_DropDownClosed;
   

2. Add the code for Keyboard class which simulate key presses

   public static class Keyboard
   {
       [DllImport("user32.dll")]
       static extern uint keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);
   
   
       const byte VK_UP = 0x26; // Arrow Up key
       const byte VK_DOWN = 0x28; // Arrow Down key
   
       const int KEYEVENTF_EXTENDEDKEY = 0x0001; //Key down flag, the key is going to be pressed
       const int KEYEVENTF_KEYUP = 0x0002; //Key up flag, the key is going to be released
   
       public static void KeyDown()
       {
           keybd_event(VK_DOWN, 0, KEYEVENTF_EXTENDEDKEY, 0);
           keybd_event(VK_DOWN, 0, KEYEVENTF_KEYUP, 0);
       }
   
       public static void KeyUp()
       {
           keybd_event(VK_UP, 0, KEYEVENTF_EXTENDEDKEY, 0);
           keybd_event(VK_UP, 0, KEYEVENTF_KEYUP, 0);
       }
   }
   

3. Add the code for DropDownOpened, DropDownClosed, MouseWheel events:

   bool IsMenuStripOpen  = false;
   
   void rootItem_DropDownOpened(object sender, EventArgs e)
   {
       IsMenuStripOpen = true;
   }
   
   
   void rootItem_DropDownClosed(object sender, EventArgs e)
   {
       IsMenuStripOpen = false;
   }
   
   void Form3_MouseWheel(object sender, MouseEventArgs e)
   {
       if (IsMenuStripOpen)
       {
           if (e.Delta > 0)
           {
               Keyboard.KeyUp();
           }
           else
           {
               Keyboard.KeyDown();
           }
       }
   }