/// <summary>
/// Show our Preview user control in the little window provided by the Screen Saver control panel.
/// </summary>
/// <param name="hWnd">The hWnd passed to us by the Screen Saver control panel.</param>
private void ShowPreview(IntPtr hWnd)
{
Log("ShowPreview(): Entered.");
Log(" ShowPreview(): cpl hWnd passed to us = " + hWnd);
if (NativeMethods.IsWindow(hWnd))
{
// Get the rect of the desired parent
int error = 0;
System.Drawing.Rectangle ParentRect = new System.Drawing.Rectangle();
NativeMethods.SetLastErrorEx(0, 0);
Log(" ShowPreview(): Let's Get the ClientRect of that puppy:");
Log(" ShowPreview(): Calling GetClientRect(" + hWnd + ")...");
bool fSuccess = NativeMethods.GetClientRect(hWnd, ref ParentRect);
error = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
Log(" ShowPreview(): GetClientRect() returned bool = " + fSuccess + ", rect = " + ParentRect.ToString());
Log(" GetLastError() returned: " + error.ToString());
Log(" ");
// Create the HwndSource which will host our Preview user control
Log(" ShowPreview(): Let's build a new HwndSource (src), and attach it to the cpl window:");
HwndSourceParameters parameters = new HwndSourceParameters();
parameters.WindowStyle = NativeMethods.WindowStyles.WS_CHILD | NativeMethods.WindowStyles.WS_VISIBLE;
parameters.SetPosition(0, 0); // in theory, our child will use values relative to parents position
parameters.SetSize(ParentRect.Width, ParentRect.Height);
parameters.ParentWindow = hWnd;
HwndSource src = new HwndSource(parameters);
#if DEBUG
// Let's see what Windows thinks
Log(" ShowPreview(): Attached it. Let's see what Windows thinks:");
Log(" ShowPreview(): Calling GetParent(src.Handle)...");
NativeMethods.SetLastErrorEx(0, 0);
IntPtr handle = IntPtr.Zero;
handle = NativeMethods.GetParent(src.Handle);
error = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
Log(" ShowPreview(): GetParent() returned: " + handle.ToString());
Log(" GetLastError() returned: " + error.ToString());
Log(" ");
#endif
// Create the user control and attach it
Log(" ShowPreview(): Creating the user control (Preview)");
PreviewControl Preview = new PreviewControl();
Log(" ShowPreview(): setting src.RootVisual to user control...");
src.RootVisual = Preview;
Preview.Visibility = Visibility.Visible;
#if DEBUG
// Let's find out what Windows thinks
Log(" ShowPreview(): Set it. Let's see what Windows thinks the HwndSource for Preview is:");
HwndSource hs = (HwndSource)HwndSource.FromVisual(Preview);
Log(" ShowPreview(): HwndSource.FromVisual(Preview) is: " + HwndSource.FromVisual(Preview));
Log(" ShowPreview(): Let's see what Windows thinks the parent hWnd of Preview is:");
Log(" ShowPreview(): Calling GetParent((HwndSource)HwndSource.FromVisual(Preview).handle)...");
NativeMethods.SetLastErrorEx(0, 0);
IntPtr ucHandle = IntPtr.Zero;
handle = NativeMethods.GetParent(hs.Handle);
error = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
Log(" ShowPreview(): GetParent() returned: " + handle.ToString());
Log(" GetLastError() returned: " + error.ToString());
Log(" ");
Log(" ShowPreview(): Is the src window visible?");
Log(" ShowPreview(): Calling IsWindowVisible(src.Handle)...");
NativeMethods.SetLastErrorEx(0, 0);
bool fVisible = NativeMethods.IsWindowVisible(src.Handle);
error = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
Log(" ShowPreview(): IsWindowVisible() returned: " + fVisible.ToString());
Log(" GetLastError() returned: " + error.ToString());
Log(" ");
#endif
// Let's hook into src's message pump
Log(" ShowPreview(): Let's hook into src's message pump");
// TODO: determine if we need to hook into message pump
}
else
{
Log(" ShowPreview(): Invalid hWnd passed: " + hWnd.ToString());
throw new ArgumentException("Invalid hWnd passed to ShowPreview(): " + hWnd.ToString());
}
Log("ShowPreview(): exiting.");
}
private HwndSource EnsureHiddenWindow()
{
if (_hiddenWindow == null)
{
HwndSourceParameters param = new HwndSourceParameters("Hidden Window");
param.SetSize(NativeMethods.CW_USEDEFAULT, NativeMethods.CW_USEDEFAULT);
param.SetPosition(NativeMethods.CW_USEDEFAULT, NativeMethods.CW_USEDEFAULT);
param.WindowStyle = NativeMethods.WS_OVERLAPPEDWINDOW;
_hiddenWindow = new HwndSource(param);
}
return _hiddenWindow;
}