File: Core\CSharp\System\Windows\Input\IInputProvider.cs
Project: wpf\src\PresentationCore.csproj (PresentationCore)
using System.Windows.Media;
 
using System;
 
namespace System.Windows.Input 
{
    /// <summary>
    ///     An interface implemented by all input providers.
    /// </summary>
    internal interface IInputProvider
    {
        /// <summary>
        ///     Indicates if the provider is responsible for providing
        ///     input for the specified visual.
        /// </summary>
        bool ProvidesInputForRootVisual(Visual v);
 
        /// <summary>
        ///     Notifies the input provider that it is no longer 
        ///     the active input provider.  If the input provider
        ///     needs to report more input, it will need to reactivate.
        /// </summary>
        void NotifyDeactivate();
    }
}