// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
//  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 MS.Win32;
using MS.Internal;
using MS.Internal.Interop;
 
using MS.Internal.PresentationCore;
 
namespace MS.Win32
{
    /// <summary>
    ///     Contains properties that are queries into the system's various settings.
    /// </summary>
    [FriendAccessAllowed] // Built into Core, also used by Framework.
    internal sealed class SafeSystemMetrics
    {
 
        private SafeSystemMetrics()
        {
        }
 
#if !PRESENTATION_CORE
        /// <summary>
        ///     Maps to SM_CXVIRTUALSCREEN
        /// </summary>
        internal static int VirtualScreenWidth
        {
            get
            {
 
                return UnsafeNativeMethods.GetSystemMetrics(SM.CXVIRTUALSCREEN);
            }
        }
 
        /// <summary>
        ///     Maps to SM_CYVIRTUALSCREEN
        /// </summary>
        internal static int VirtualScreenHeight
        {
            get
            {
                return UnsafeNativeMethods.GetSystemMetrics(SM.CYVIRTUALSCREEN);
            }
        }
#endif //end !PRESENTATIONCORE
 
        /// <summary>
        ///     Maps to SM_CXDOUBLECLK
        /// </summary>
        internal static int DoubleClickDeltaX
        {
            get
            {
                return UnsafeNativeMethods.GetSystemMetrics(SM.CXDOUBLECLK);
            }
        }
 
        /// <summary>
        ///     Maps to SM_CYDOUBLECLK
        /// </summary>
        internal static int DoubleClickDeltaY
        {
            get
            {
                return UnsafeNativeMethods.GetSystemMetrics(SM.CYDOUBLECLK);
            }
        }
 
            
        /// <summary>
        ///     Maps to SM_CXDRAG
        /// </summary>
        internal static int DragDeltaX
        {
            get
            {
                return UnsafeNativeMethods.GetSystemMetrics(SM.CXDRAG);
            }
        }
 
        /// <summary>
        ///     Maps to SM_CYDRAG
        /// </summary>
        internal static int DragDeltaY
        {
            get
            {
                return UnsafeNativeMethods.GetSystemMetrics(SM.CYDRAG);
            }
        }
 
        ///<summary> 
        /// Is an IMM enabled ? Maps to SM_IMMENABLED
        ///</summary> 
        internal static bool IsImmEnabled
        {
            get
            {
                return  (UnsafeNativeMethods.GetSystemMetrics(SM.IMMENABLED) != 0);
            }
 
        }
 
    }
}