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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2024 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Text;
using System.Windows.Forms;
using KeePass.Native;
using KeePass.Util;
namespace KeePass.UI
{
// Code derived from https://support.microsoft.com/kb/830033/
public sealed class EnableThemingInScope : IDisposable
{
private UIntPtr? m_nuCookie = null;
private static readonly object m_oSync = new object();
private static IntPtr? m_nhCtx = null;
public EnableThemingInScope(bool bEnable)
{
if(!bEnable) return;
if(KeePassLib.Native.NativeLib.IsUnix()) return;
try
{
if(OSFeature.Feature.IsPresent(OSFeature.Themes))
{
if(EnsureActCtxCreated())
{
UIntPtr u = UIntPtr.Zero;
if(NativeMethods.ActivateActCtx(m_nhCtx.Value, ref u))
m_nuCookie = u;
else { Debug.Assert(false); }
}
else { Debug.Assert(false); }
}
}
catch(Exception) { Debug.Assert(false); }
}
~EnableThemingInScope()
{
Debug.Assert(!m_nuCookie.HasValue);
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool bDisposing)
{
try
{
if(!m_nuCookie.HasValue) return;
if(NativeMethods.DeactivateActCtx(0, m_nuCookie.Value))
m_nuCookie = null;
else { Debug.Assert(false); }
}
catch(Exception) { Debug.Assert(false); }
}
public static void StaticDispose()
{
try
{
if(!m_nhCtx.HasValue) return;
NativeMethods.ReleaseActCtx(m_nhCtx.Value);
m_nhCtx = null;
}
catch(Exception) { Debug.Assert(false); }
}
private static bool EnsureActCtxCreated()
{
lock(m_oSync)
{
if(m_nhCtx.HasValue) return true;
string strAsmLoc;
FileIOPermission p = new FileIOPermission(PermissionState.None);
p.AllFiles = FileIOPermissionAccess.PathDiscovery;
p.Assert();
try { strAsmLoc = typeof(object).Assembly.Location; }
finally { CodeAccessPermission.RevertAssert(); }
if(string.IsNullOrEmpty(strAsmLoc)) { Debug.Assert(false); return false; }
string strInstDir = Path.GetDirectoryName(strAsmLoc);
string strMfLoc = Path.Combine(strInstDir, "XPThemes.manifest");
NativeMethods.ACTCTX ctx = new NativeMethods.ACTCTX();
ctx.cbSize = (uint)Marshal.SizeOf(typeof(NativeMethods.ACTCTX));
Debug.Assert(((IntPtr.Size == 4) && (ctx.cbSize ==
NativeMethods.ACTCTXSize32)) || ((IntPtr.Size == 8) &&
(ctx.cbSize == NativeMethods.ACTCTXSize64)));
ctx.lpSource = strMfLoc;
ctx.lpAssemblyDirectory = strInstDir;
ctx.dwFlags = NativeMethods.ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID;
m_nhCtx = NativeMethods.CreateActCtx(ref ctx);
if(NativeMethods.IsInvalidHandleValue(m_nhCtx.Value))
{
Debug.Assert(false);
m_nhCtx = null;
return false;
}
}
return true;
}
}
}
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