// 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.
 
using System;
using System.Security;
using System.Runtime.InteropServices;
//using System.Runtime.CompilerServices;
using System.Windows.Automation;
using Microsoft.Win32.SafeHandles;
using MS.Win32;
 
namespace MS.Internal.AutomationProxies
{
    internal sealed class SafeThemeHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        // This constructor is used by the P/Invoke marshaling layer
        // to allocate a SafeHandle instance.  P/Invoke then does the
        // appropriate method call, storing the handle in this class.
        private SafeThemeHandle() : base(true) {}
 
        // Uncomment this if & only if we need a constructor 
        // that takes a handle from external code
        internal SafeThemeHandle(IntPtr preexistingHandle, bool ownsHandle) : base(ownsHandle)
        {
            SetHandle(preexistingHandle);
        }
 
        protected override bool ReleaseHandle()
        {
            // MustRun methods may only call other MustRun methods,
            // must not allocate along paths that must succeed, etc.
            return !IsInvalid ? CloseThemeData(handle) == (IntPtr)NativeMethods.S_OK : true;
        }
 
        [DllImport("UxTheme.dll", CharSet = CharSet.Auto)/**/]
        private static extern IntPtr CloseThemeData(IntPtr handle);
    }
}