{

/// <summary>

/// Displays a WinForms.WebBrowser control over a given placement target element in a WPF Window.

/// Applies the opacity of the Window to the WebBrowser control.

/// </summary>

class WebBrowserOverlayWF

{

Window _owner;

FrameworkElement _placementTarget;

Form _form; // the top-level window holding the WebBrowser control

WebBrowser _wb = new WebBrowser();

public WebBrowser WebBrowser { get { return _wb; } }

public WebBrowserOverlayWF(FrameworkElement placementTarget)

{

_placementTarget = placementTarget;

Window owner = Window.GetWindow(placementTarget);

Debug.Assert(owner != null);

_owner = owner;

_form = new Form();

_form.Opacity = owner.Opacity;

_form.ShowInTaskbar = false;

_form.FormBorderStyle = FormBorderStyle.None;

_wb.Dock = DockStyle.Fill;

_form.Controls.Add(_wb);

//owner.SizeChanged += delegate { OnSizeLocationChanged(); };

owner.LocationChanged += delegate { OnSizeLocationChanged(); };

_placementTarget.SizeChanged += delegate { OnSizeLocationChanged(); };

if (owner.IsVisible)

InitialShow();

else

owner.SourceInitialized += delegate

{

InitialShow();

};

DependencyPropertyDescriptor dpd = DependencyPropertyDescriptor.FromProperty(UIElement.OpacityProperty, typeof(Window));

dpd.AddValueChanged(owner, delegate { _form.Opacity = _owner.Opacity; });

_form.FormClosing += delegate { _owner.Close(); };

}

void InitialShow()

{

NativeWindow owner = new NativeWindow();

owner.AssignHandle(((HwndSource)HwndSource.FromVisual(_owner)).Handle);

_form.Show(owner);

owner.ReleaseHandle();

}

DispatcherOperation _repositionCallback;

void OnSizeLocationChanged()

{

// To reduce flicker when transparency is applied without DWM composition,

// do resizing at lower priority.

if (_repositionCallback == null)

_repositionCallback = _owner.Dispatcher.BeginInvoke(Reposition, DispatcherPriority.Input);

}

void Reposition()

{

_repositionCallback = null;

Point offset = _placementTarget.TranslatePoint(new Point(), _owner);

Point size = new Point(_placementTarget.ActualWidth, _placementTarget.ActualHeight);

HwndSource hwndSource = (HwndSource)HwndSource.FromVisual(_owner);

CompositionTarget ct = hwndSource.CompositionTarget;

offset = ct.TransformToDevice.Transform(offset);

size = ct.TransformToDevice.Transform(size);

Win32.POINT screenLocation = new Win32.POINT(offset);

Win32.ClientToScreen(hwndSource.Handle, ref screenLocation);

Win32.POINT screenSize = new Win32.POINT(size);

Win32.MoveWindow(_form.Handle, screenLocation.X, screenLocation.Y, screenSize.X, screenSize.Y, true);

//_form.SetBounds(screenLocation.X, screenLocation.Y, screenSize.X, screenSize.Y);

//_form.Update();

}

};