internal void MoveToScreenCenter(HandleRef hWnd)
{
// Create an IntPtr to store a handle to the monitor.
IntPtr hMonitor = IntPtr.Zero;
// Get the monitor to use based on the location of the parent window
if (_hwndOwnerWindow != IntPtr.Zero)
{
// we have a owner hwnd; center on the screen on
// which our owner hwnd is.
// We use MONITOR_DEFAULTTONEAREST to get the monitor
// nearest to the window if the window doesn't intersect
// any display monitor.
hMonitor = SafeNativeMethods.MonitorFromWindow(
new HandleRef(this, _hwndOwnerWindow), // window to find monitor location for
NativeMethods.MONITOR_DEFAULTTONEAREST); // get the monitor nearest to the window
// Only move the window if we got a valid monitor... otherwise let Windows
// position the dialog.
if (hMonitor != IntPtr.Zero)
{
// Now, create another RECT and fill it with the bounds of the parent window.
NativeMethods.RECT dialogRect = new NativeMethods.RECT();
SafeNativeMethods.GetWindowRect(hWnd, ref dialogRect);
Size dialogSize = new Size((dialogRect.right - dialogRect.left), /*width*/
(dialogRect.bottom - dialogRect.top)); /*height*/
// create variables that will receive the new position of the dialog
double x = 0;
double y = 0;
// Call into a static function in System.Windows.Window to calculate
// the actual new position
Window.CalculateCenterScreenPosition(hMonitor,
dialogSize,
ref x,
ref y);
// Call SetWindowPos to actually move the window.
UnsafeNativeMethods.SetWindowPos(hWnd, // handle to the window to move
NativeMethods.NullHandleRef, // window to precede this one in zorder
(int)Math.Round(x),
(int)Math.Round(y), // new X and Y positions
0, 0, // new width and height, if applicable
// Flags:
// SWP_NOSIZE: Retains current size
// SWP_NOZORDER: retains current zorder
// SWP_NOACTIVATE: does not activate the window
NativeMethods.SWP_NOSIZE | NativeMethods.SWP_NOZORDER | NativeMethods.SWP_NOACTIVATE);
}
}
}
internal void MoveToScreenCenter(HandleRef hWnd)
{
IntPtr intPtr = IntPtr.Zero;
if (this._hwndOwnerWindow != IntPtr.Zero)
{
intPtr = SafeNativeMethods.MonitorFromWindow(new HandleRef(this, this._hwndOwnerWindow), 2);
if (intPtr != IntPtr.Zero)
{
NativeMethods.RECT rect = default(NativeMethods.RECT);
SafeNativeMethods.GetWindowRect(hWnd, ref rect);
Size currentSizeDeviceUnits = new Size((double)(rect.right - rect.left), (double)(rect.bottom - rect.top));
double a = 0.0;
double a2 = 0.0;
Window.CalculateCenterScreenPosition(intPtr, currentSizeDeviceUnits, ref a, ref a2);
UnsafeNativeMethods.SetWindowPos(hWnd, NativeMethods.NullHandleRef, (int)Math.Round(a), (int)Math.Round(a2), 0, 0, 21);
}
}
}
