public void Register(IntPtr destination, IntPtr source)
{
this._properties = new DWM_THUMBNAIL_PROPERTIES();
this._properties.dwFlags = DWM_TNP_CONSTANTS.DWM_TNP_VISIBLE
+ DWM_TNP_CONSTANTS.DWM_TNP_OPACITY
+ DWM_TNP_CONSTANTS.DWM_TNP_RECTDESTINATION
+ DWM_TNP_CONSTANTS.DWM_TNP_SOURCECLIENTAREAONLY;
this._properties.opacity = 255;
this._properties.fVisible = true;
this._properties.fSourceClientAreaOnly = true;
if (!this._windowManager.IsCompositionEnabled)
{
return;
}
try
{
this._handle = DwmNativeMethods.DwmRegisterThumbnail(destination, source);
}
catch (ArgumentException)
{
// This exception is raised if the source client is already closed
// Can happen on a really slow CPU's that the window is still being
// listed in the process list yet it already cannot be used as
// a thumbnail source
this._handle = IntPtr.Zero;
}
catch (COMException)
{
// This exception is raised if DWM is suddenly not available
// (f.e. when switching between Windows user accounts)
this._handle = IntPtr.Zero;
}
}
public WindowManager()
{
// Composition is always enabled for Windows 8+
this.IsCompositionEnabled =
((Environment.OSVersion.Version.Major == 6) && (Environment.OSVersion.Version.Minor >= 2)) || // Win 8 and Win 8.1
(Environment.OSVersion.Version.Major >= 10) || // Win 10
DwmNativeMethods.DwmIsCompositionEnabled(); // In case of Win 7 an API call is requiredWin 7
}
public void HideFromPeek(IWindowWithHandle window)
{
var handle = window.RetrieveHandle();
var attrValue = (int)DwmRenderingPolicy.Enabled;
DwmNativeMethods.DwmSetWindowAttribute(handle, DwmWindowAttribute.ExcludedFromPeek, ref attrValue, sizeof(int));
DwmNativeMethods.DwmSetWindowAttribute(handle, DwmWindowAttribute.DisallowPeek, ref attrValue, sizeof(int));
}
public void Unregister()
{
if ((!this._windowManager.IsCompositionEnabled) || (this._handle == IntPtr.Zero))
{
return;
}
try
{
DwmNativeMethods.DwmUnregisterThumbnail(this._handle);
}
catch (ArgumentException)
{
}
catch (COMException)
{
// This exception is raised when DWM is not available for some reason
}
}
public void Update()
{
if ((!this._windowManager.IsCompositionEnabled) || (this._handle == IntPtr.Zero))
{
return;
}
try
{
DwmNativeMethods.DwmUpdateThumbnailProperties(this._handle, this._properties);
}
catch (ArgumentException)
{
// This exception will be thrown if the EVE client disappears while this method is running
}
catch (COMException)
{
// This exception is raised when DWM is not available for some reason
}
}
