Win32MouseDevice.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / Win32MouseDevice.cs / 1305600 / Win32MouseDevice.cs
                        

                        
                            using System.Diagnostics; 
using System.Collections;
using System.Windows;
using System.Windows.Media;
using System.Windows.Interop; 
using System.Windows.Threading;
using System.Security; 
using System.Security.Permissions; 
using MS.Internal;
using MS.Internal.PresentationCore;                        // SecurityHelper 
using MS.Win32; // *NativeMethods
using System.Runtime.InteropServices;
using System;
 
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID; 
 
namespace System.Windows.Input
{ 
    /// 
    ///     The Win32MouseDevice class implements the platform specific
    ///     MouseDevice features for the Win32 platform
    ///  
    internal sealed class Win32MouseDevice : MouseDevice
    { 
        ///  
        ///
        ///  
        /// 
        /// 
        /// 
        /// Critical - This is code that elevates AND creates the mouse device which 
        ///             happens to hold the callback to filter mouse messages
        /// TreatAsSafe: This constructor handles critical data but does not expose it 
        ///             It stores instance but there are demands on the instances. 
        /// 
        [SecurityCritical,SecurityTreatAsSafe] 
        internal Win32MouseDevice(InputManager inputManager)
            : base(inputManager)
        {
        } 

        ///  
        ///     Gets the current state of the specified button from the device from the underlying system 
        /// 
        ///  
        ///     The mouse button to get the state of
        /// 
        /// 
        ///     The state of the specified mouse button 
        /// 
        ///  
        ///     Critical: Makes calls to UnsafeNativeMethods (GetKeyState) 
        ///     TreatAsSafe: Only returns the current state of the specified button
        ///  
        [SecurityCritical,SecurityTreatAsSafe]
        internal override MouseButtonState GetButtonStateFromSystem(MouseButton mouseButton)
        {
            MouseButtonState mouseButtonState = MouseButtonState.Released; 

            // Security Mitigation: do not give out input state if the device is not active. 
            if(IsActive) 
            {
                int virtualKeyCode = 0; 

                switch( mouseButton )
                {
                    case MouseButton.Left: 
                        virtualKeyCode = NativeMethods.VK_LBUTTON;
                        break; 
                    case MouseButton.Right: 
                        virtualKeyCode = NativeMethods.VK_RBUTTON;
                        break; 
                    case MouseButton.Middle:
                        virtualKeyCode = NativeMethods.VK_MBUTTON;
                        break;
                    case MouseButton.XButton1: 
                        virtualKeyCode = NativeMethods.VK_XBUTTON1;
                        break; 
                    case MouseButton.XButton2: 
                        virtualKeyCode = NativeMethods.VK_XBUTTON2;
                        break; 
                }

                mouseButtonState = ( UnsafeNativeMethods.GetKeyState(virtualKeyCode) & 0x8000 ) != 0 ? MouseButtonState.Pressed : MouseButtonState.Released;
            } 

            return mouseButtonState; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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