find Button click event is from Mouse or touchoad in WPF

Question

Hi,
I am working on app. which need to verify external mouse is working on not. i handled click events, these click events are working for both Touchpad and external mouse as-well.

private void MouseLeftClickHandler(object sender, MouseButtonEventArgs e)
        {
            if( CONDITION ){

                          print("Mouse is clicked")

                  }
             else{

                        print("Touch pad on laptop is clicked")

             }

       }

I want to differential input event is touchpad on laptop or a mose connected externally.
What is the condition i need to keep.

Answer 1

I have no Touchpad to test, but this test with the mouse works for me with GetCurrentInputMessageSource :

[DllImport("User32.dll", SetLastError = true)]  
private static extern bool GetCurrentInputMessageSource(out INPUT_MESSAGE_SOURCE inputMessageSource);  
  
[StructLayout(LayoutKind.Sequential)]  
public struct INPUT_MESSAGE_SOURCE  
{  
    public INPUT_MESSAGE_DEVICE_TYPE deviceType;  
    public INPUT_MESSAGE_ORIGIN_ID originId;  
}  
  
public enum INPUT_MESSAGE_DEVICE_TYPE  
{  
    IMDT_UNAVAILABLE = 0x00000000,      // not specified  
    IMDT_KEYBOARD = 0x00000001,      // from keyboard  
    IMDT_MOUSE = 0x00000002,      // from mouse  
    IMDT_TOUCH = 0x00000004,      // from touch  
    IMDT_PEN = 0x00000008,      // from pen  
    IMDT_TOUCHPAD    = 0x00000010,      // from touchpad  
}  
  
public enum INPUT_MESSAGE_ORIGIN_ID  
{  
    IMO_UNAVAILABLE = 0x00000000,  // not specified  
    IMO_HARDWARE = 0x00000001,  // from a hardware device or injected by a UIAccess app  
    IMO_INJECTED = 0x00000002,  // injected via SendInput() by a non-UIAccess app  
    IMO_SYSTEM = 0x00000004,  // injected by the system  
}  
  
public const int WM_MOUSEFIRST = 0x0200;  
public const int WM_MOUSELAST = 0x020E;  
public const int WM_KEYFIRST = 0x0100;  
public const int WM_KEYLAST = 0x0109;  
public const int WM_TOUCH = 0x0240;  
public const int WM_POINTERWHEEL = 0x024E;  
  
  
protected override void OnSourceInitialized(EventArgs e)  
{  
    base.OnSourceInitialized(e);  
    HwndSource hWndSource = PresentationSource.FromVisual(this) as HwndSource;  
    hWndSource.AddHook(WndProc);  
}  
  
private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)  
{  
    if ((msg >= WM_MOUSEFIRST && msg <= WM_MOUSELAST) || (msg >= WM_KEYFIRST && msg <= WM_KEYLAST) || (msg >= WM_TOUCH && msg <= WM_POINTERWHEEL))  
    {  
        INPUT_MESSAGE_SOURCE ims = new INPUT_MESSAGE_SOURCE();  
        GetCurrentInputMessageSource(out ims);   
        if (ims.deviceType == INPUT_MESSAGE_DEVICE_TYPE.IMDT_MOUSE)  
        {  
            Console.Beep(6000, 5);  
        }  
        // not tested  
        else if (ims.deviceType == INPUT_MESSAGE_DEVICE_TYPE.IMDT_TOUCHPAD)  
        {  
            Console.Beep(2000, 5);  
        }  
    }  
    return IntPtr.Zero;  
}