private static void OnCopyBitsBehaviorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
HwndHost hwndHost = d as HwndHost;
if (hwndHost != null)
{
CopyBitsBehavior newValue = (CopyBitsBehavior)e.NewValue;
if (newValue != CopyBitsBehavior.Default)
{
AddWndProcUsage(hwndHost);
}
else
{
RemoveWndProcUsage(hwndHost);
}
}
}
protected override IntPtr WndProcOverride(HWND hwnd, WM msg, IntPtr wParam, IntPtr lParam, IntPtr id, IntPtr data)
{
IntPtr?result = null;
if (msg == WM.WINDOWPOSCHANGING)
{
unsafe
{
WINDOWPOS *pWindowPos = (WINDOWPOS *)lParam;
CopyBitsBehavior copyBitsBehavior = _hwndHost.GetCopyBitsBehavior();
switch (copyBitsBehavior)
{
case CopyBitsBehavior.AlwaysCopyBits:
pWindowPos->flags &= ~SWP.NOCOPYBITS;
break;
case CopyBitsBehavior.CopyBitsAndRepaint:
pWindowPos->flags &= ~SWP.NOCOPYBITS;
if (!_redrawMessagePosted)
{
NativeMethods.PostMessage(hwnd, _redrawMessage, IntPtr.Zero, IntPtr.Zero);
_redrawMessagePosted = true;
}
break;
case CopyBitsBehavior.NeverCopyBits:
pWindowPos->flags |= SWP.NOCOPYBITS;
break;
case CopyBitsBehavior.Default:
default:
// do nothing.
break;
}
}
}
else if (msg == _redrawMessage)
{
_redrawMessagePosted = false;
// Invalidate the window that moved, because it might have copied garbage
// due to WPF rendering through DX on a different thread.
NativeMethods.RedrawWindow(hwnd, IntPtr.Zero, IntPtr.Zero, RDW.INVALIDATE | RDW.ALLCHILDREN);
// Then immediately redraw all invalid regions within the top-level window.
HWND hwndRoot = NativeMethods.GetAncestor(hwnd, GA.ROOT);
NativeMethods.RedrawWindow(hwndRoot, IntPtr.Zero, IntPtr.Zero, RDW.UPDATENOW | RDW.ALLCHILDREN);
}
else if (msg == WM.MOUSEACTIVATE)
{
bool raiseMouseActivateCommand = _hwndHost.GetRaiseMouseActivateCommand();
if (raiseMouseActivateCommand)
{
// Raise the HwndHostCommands.MouseActivate command.
MouseActivateParameter parameter = new MouseActivateParameter();
HwndHostCommands.MouseActivate.Execute(parameter, _hwndHost);
if (parameter.HandleMessage)
{
if (parameter.Activate == false && parameter.EatMessage == false)
{
result = new IntPtr((int)MA.NOACTIVATE);
}
else if (parameter.Activate == false && parameter.EatMessage == true)
{
result = new IntPtr((int)MA.NOACTIVATEANDEAT);
}
else if (parameter.Activate == true && parameter.EatMessage == false)
{
result = new IntPtr((int)MA.ACTIVATE);
}
else // if(parameter.Activate == true && parameter.EatMessage == true)
{
result = new IntPtr((int)MA.ACTIVATEANDEAT);
}
}
}
}
return(result ?? base.WndProcOverride(hwnd, msg, wParam, lParam, id, data));
}
/// <summary>
/// Attached property setter for the CopyBitsBehavior property.
/// </summary>
public static void SetCopyBitsBehavior(this HwndHost @this, CopyBitsBehavior value)
{
@this.SetValue(CopyBitsBehaviorProperty, value);
}
/// <summary>
/// Attached property setter for the CopyBitsBehavior property.
/// </summary>
public static void SetCopyBitsBehavior(this HwndHost @this, CopyBitsBehavior value)
{
@this.SetValue(CopyBitsBehaviorProperty, value);
}
