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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2017 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.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;
using KeePass.Native;
using NativeLib = KeePassLib.Native.NativeLib;
namespace KeePass.Util
{
public sealed class ClipboardEventChainBlocker : IDisposable
{
private ClipboardBlockerForm m_form = null;
private IntPtr m_hChain = IntPtr.Zero;
public ClipboardEventChainBlocker()
{
if(NativeLib.IsUnix()) return; // Unsupported
m_form = new ClipboardBlockerForm();
try
{
m_hChain = NativeMethods.SetClipboardViewer(m_form.Handle);
}
catch(Exception) { Debug.Assert(false); }
}
~ClipboardEventChainBlocker()
{
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool bDisposing)
{
if(bDisposing && (m_form != null))
{
try
{
// Ignore return value (no assert); see documentation
// of ChangeClipboardChain
NativeMethods.ChangeClipboardChain(m_form.Handle, m_hChain);
}
catch(Exception) { Debug.Assert(false); }
m_form.Dispose();
m_form = null;
}
m_hChain = IntPtr.Zero;
}
[Obsolete]
public void Release()
{
Dispose(true);
}
private sealed class ClipboardBlockerForm : Form
{
public ClipboardBlockerForm() : base()
{
this.Visible = false;
this.ShowInTaskbar = false;
this.ShowIcon = false;
}
public override bool PreProcessMessage(ref Message msg)
{
if(msg.Msg == NativeMethods.WM_DRAWCLIPBOARD)
return true; // Block message
return base.PreProcessMessage(ref msg);
}
}
}
}
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