/// <summary>
///
/// </summary>
internal void BeginHosting(VisualTarget target)
{
//
// This method is executed on the visual target thread.
//
Debug.Assert(target != null);
Debug.Assert(target.Dispatcher.Thread == Thread.CurrentThread);
using (CompositionEngineLock.Acquire())
{
//
// Check if another target is already hosted by this
// visual and throw exception if this is the case.
//
if (_target != null)
{
throw new InvalidOperationException(
SR.Get(SRID.VisualTarget_AnotherTargetAlreadyConnected)
);
}
_target = target;
//
// If HostVisual and VisualTarget on same thread, then call Invalidate
// directly. Otherwise post invalidate message to the host visual thread
// indicating that content update is required.
//
if (this.CheckAccess())
{
Invalidate();
}
else
{
Dispatcher.BeginInvoke(
DispatcherPriority.Normal,
(DispatcherOperationCallback) delegate(object args)
{
Invalidate();
return(null);
},
null
);
}
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="hostVisual">host visual</param>
public VisualTargetPresentationSource(HostVisual hostVisual)
{
_visualTarget = new VisualTarget(hostVisual);
AddSource();
}
/// <summary>
///
/// </summary>
internal void BeginHosting(VisualTarget target)
{
//
// This method is executed on the visual target thread.
//
Debug.Assert(target != null);
Debug.Assert(target.Dispatcher.Thread == Thread.CurrentThread);
using (CompositionEngineLock.Acquire())
{
//
// Check if another target is already hosted by this
// visual and throw exception if this is the case.
//
if (_target != null)
{
throw new InvalidOperationException(
SR.Get(SRID.VisualTarget_AnotherTargetAlreadyConnected)
);
}
_target = target;
//
// If HostVisual and VisualTarget on same thread, then call Invalidate
// directly. Otherwise post invalidate message to the host visual thread
// indicating that content update is required.
//
if (this.CheckAccess())
{
Invalidate();
}
else
{
Dispatcher.BeginInvoke(
DispatcherPriority.Normal,
(DispatcherOperationCallback)delegate(object args)
{
Invalidate();
return null;
},
null
);
}
}
}
public VisualTargetPresentationSource(HostVisual theHostVisual)
{
myVisualTarget = new VisualTarget(theHostVisual);
}
public VisualTarget(HostVisual hostVisual)
{
_visualTarget = new System.Windows.Media.VisualTarget(hostVisual);
}
