Capturing mouse events from every component

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One straightforward way to do this is to add a message loop filter by calling Application.AddMessageFilter and writing a class that implements the IMessageFilter interface.

Via IMessageFilter.PreFilterMessage, your class gets to see any inputs messages that pass through your application’s message loop. PreFilterMessage also gets to decide whether to pass these messages on to the specific control to which they’re destined.

One piece of complexity that this approach introduces is having to deal with Windows messages, via the Message struct passed to your PreFilterMessage method. This means referring to the Win32 documention on WM\_LBUTTONDOWN, WM\_MOUSEMOVE, WM\_LBUTTONUP etc, instead of the conventional MouseDown, MouseMove and MouseUp events.

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