How can I center RadWindow?

[Alan]

Good morning, afternoon, evening,

I am having trouble figuring out how I can center a RadWindow using WindowStartupLocation.CenterOwner when I open it from a non-wpf application.

I used the following code in my winform app to open a dialog that is a System.Windows.Window.  When I convert it to a RadWindow, it doesn't work and I am at a loss as to how to duplicate functionality.

 

 

 

var dlg = new MyDialog();

 

System.Windows.Interop.

 

WindowInteropHelper hwndHelper = new System.Windows.Interop.WindowInteropHelper(dlg);

 

hwndHelper.Owner =

 

new IntPtr(Globals.ThisAddIn.Application.Hwnd);

 

dlg.ShowDialog();

How can I center the window?

Please assist.

Thanks,
Alan

PS.  I have a support agreement but decided to post here so that others might benefit from response.

[Konstantina]

Hi Alan,

Thank you for contacting us.

To center the RadWindow you can hook to the Loaded event of the MainWindow and set the WindowStartupLocation property there, for example:

private void Window_Loaded(object sender, RoutedEventArgs e)
     {
         window = new MyWindow();
         window.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner;
         window.Owner = this;
         window.Show();
     }

Hope this helps. If you need further help please let us know.

Sincerely yours,
Konstantina
the Telerik team

[Alan]

Good morning/afternoon/evening Konstantina,

Unfortunately, my question is how to do this from a non-WPF application ie I am opening the RadWindow from a winforms app.  The suggestion that you provided only works if you are opening a RadWindow from another wpf window.

Any other suggestions are welcome?

Thanks,
Alan

[Konstantina]

Hi Alan,

Thank you for your reply.

I can suggest you to center RadWindow manually according left, top, width, height properties of the Owner. 
Here is how you could accomplish this:

// Manually calculate Top/Left to appear centered
RadWindow control = new RadWindow() { Width = 200, Height = 100 };

int nonWPFOwnerLeft = ...; // Get non-WPF owner’s Left
int nonWPFOwnerWidth = ...; // Get non-WPF owner’s Width
int nonWPFOwnerTop = ...; // Get non-WPF owner’s Top
int nonWPFOwnerHeight = ...; // Get non-WPF owner’s Height
control.WindowStartupLocation = System.Windows.WindowStartupLocation.Manual;
control.Left = nonWPFOwnerLeft + (nonWPFOwnerWidth - control.Width) / 2;
control.Top = nonWPFOwnerTop + (nonWPFOwnerHeight - control.Height) / 2;

// Show the owned WPF window
control.Show();

This code is from official Microsoft blog Centering WPF Windows with WPF and Non-WPF Owner Windows. 

Hope this is helpful. If you have any other questions about our controls please let us know.

Greetings,
Konstantina
the Telerik team