Show WPF window insite another WPF window

Question

I have this code and it works fine.

public class WindowHelper
    {
        private const int GWL_STYLE = (-16);

        private const UInt32 WS_POPUP = 0x80000000;
        private const UInt32 WS_CHILD = 0x40000000;

        [DllImport("user32.dll", SetLastError = true)]
        private static extern UInt32 GetWindowLongApi(IntPtr hWnd, int nIndex);

        [DllImport("user32.dll")]
        private static extern int SetWindowLongApi(IntPtr hWnd, int nIndex, UInt32 dwNewLong);

        [DllImport("user32.dll", SetLastError = true)]
        private static extern IntPtr SetParentApi(IntPtr hWndChild, IntPtr hWndNewParent);

        public void SetParent(Window childWindow, Window parentWindow)
        {
            childWindow.Owner = parentWindow;
            childWindow.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner;

            childWindow.Show();

            IntPtr childWindowHandle = new WindowInteropHelper(childWindow).Handle;
            IntPtr parentWindowHandle = new WindowInteropHelper(parentWindow).Handle;

            uint windowStyle = GetWindowLongApi(childWindowHandle, GWL_STYLE);
            windowStyle = (windowStyle & ~(WS_POPUP)) | WS_CHILD;

            SetWindowLongApi(childWindowHandle, GWL_STYLE, windowStyle);

            SetParentApi(childWindowHandle, parentWindowHandle);
        }
}

But if I would like to have a modal ChildWindow this code doesn´t work. To pop up a modal window I use ".ShowDialog();". To use ".ShowDialog();" in my code I have to show up my ChildWindow first with ".Show();" than I take the current style from that and than I ".Hide();" the ChildWindow again. Now I can use ".ShowDialog();" to get a modal window. But this ChildWindow shows no reaction of any mouse or keyboard action from me.

Thank you,

Eric Weber

Answer 1

Use this method to show your modal window:

http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/820bf10f-3eaf-43a8-b5ef-b83b2394342c

http://code.msdn.microsoft.com/windowsdesktop/Modeless-Window-in-WPF-492cb24f

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Stay hungry, stay foolish

Answer 2

Hi Eric,
 
I am marking your issue as "Answered", if you have new findings about your issue, please let me know.

Best regards,

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Sheldon _Xiao
MSDN Community Support | Feedback to us
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