SafeSystemMetrics.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 / Shared / MS / Win32 / SafeSystemMetrics.cs / 1305600 / SafeSystemMetrics.cs
                        

                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2004
//
//  File: SafeSystemMetrics.cs 
//  This class is copied from the system metrics class in frameworks. The
//  reason it exists is to consolidate all system metric calls through one layer 
//  so that maintenance from a security stand point gets easier. We will add 
//  mertrics on a need basis. The caching code is removed since the original calls
//  that were moved here do not rely on caching. If there is a percieved perf. problem 
//  we can work on enabling this.
//-----------------------------------------------------------------------------
using System;
using System.Collections; 
using System.Runtime.InteropServices;
using System.Windows.Media; 
using Microsoft.Win32; 
using System.Security;
using System.Security.Permissions; 
using MS.Win32;
using MS.Internal;
using MS.Internal.Interop;
 
using MS.Internal.PresentationCore;
 
namespace MS.Win32 
{
    ///  
    ///     Contains properties that are queries into the system's various settings.
    /// 
    [FriendAccessAllowed] // Built into Core, also used by Framework.
    internal sealed class SafeSystemMetrics 
    {
 
        private SafeSystemMetrics() 
        {
        } 

#if !PRESENTATION_CORE
        /// 
        ///     Maps to SM_CXVIRTUALSCREEN 
        /// 
        ///  
        ///    TreatAsSafe --There exists a demand 
        ///    Security Critical -- Calling UnsafeNativeMethods
        ///  
        internal static int VirtualScreenWidth
        {
            [SecurityCritical,SecurityTreatAsSafe]
            get 
            {
                SecurityHelper.DemandUnmanagedCode(); 
 
                return UnsafeNativeMethods.GetSystemMetrics(SM.CXVIRTUALSCREEN);
            } 
        }

        /// 
        ///     Maps to SM_CYVIRTUALSCREEN 
        /// 
        ///  
        ///    TreatAsSafe --There exists a demand 
        ///    Security Critical -- Calling UnsafeNativeMethods
        ///  
        internal static int VirtualScreenHeight
        {
            [SecurityCritical,SecurityTreatAsSafe]
            get 
            {
                SecurityHelper.DemandUnmanagedCode(); 
                return UnsafeNativeMethods.GetSystemMetrics(SM.CYVIRTUALSCREEN); 
            }
        } 
#endif //end !PRESENTATIONCORE

        /// 
        ///     Maps to SM_CXDOUBLECLK 
        /// 
        ///  
        ///     TreatAsSafe --This data is safe to expose 
        ///     Security Critical -- Calling UnsafeNativeMethods
        ///  
        internal static int DoubleClickDeltaX
        {
            [SecurityCritical, SecurityTreatAsSafe]
            get 
            {
                return UnsafeNativeMethods.GetSystemMetrics(SM.CXDOUBLECLK); 
            } 
        }
 
        /// 
        ///     Maps to SM_CYDOUBLECLK
        /// 
        ///  
        ///    TreatAsSafe --This data is safe to expose
        ///    Security Critical -- Calling UnsafeNativeMethods 
        ///  
        internal static int DoubleClickDeltaY
        { 
            [SecurityCritical, SecurityTreatAsSafe]
            get
            {
                return UnsafeNativeMethods.GetSystemMetrics(SM.CYDOUBLECLK); 
            }
        } 
 

        ///  
        ///     Maps to SM_CXDRAG
        /// 
        /// 
        ///     TreatAsSafe --This data is safe to expose 
        ///     Security Critical -- Calling UnsafeNativeMethods
        ///  
        internal static int DragDeltaX 
        {
            [SecurityCritical, SecurityTreatAsSafe] 
            get
            {
                return UnsafeNativeMethods.GetSystemMetrics(SM.CXDRAG);
            } 
        }
 
        ///  
        ///     Maps to SM_CYDRAG
        ///  
        /// 
        ///    TreatAsSafe --This data is safe to expose
        ///    Security Critical -- Calling UnsafeNativeMethods
        ///  
        internal static int DragDeltaY
        { 
            [SecurityCritical, SecurityTreatAsSafe] 
            get
            { 
                return UnsafeNativeMethods.GetSystemMetrics(SM.CYDRAG);
            }
        }
 
        ///
        /// Is an IMM enabled ? Maps to SM_IMMENABLED 
        /// 
        ///
        ///Critical - calls a method that performs an elevation. 
        /// TreatAsSafe - data is considered safe to expose.
        ///
        internal static bool IsImmEnabled
        { 
            [SecurityCritical, SecurityTreatAsSafe]
            get 
            { 
                return  (UnsafeNativeMethods.GetSystemMetrics(SM.IMMENABLED) != 0);
            } 

        }

    } 
}

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

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