How to check if Addon window already opened?

[defa0009]

Hi,

I need to restrict the opening of an addon window to just one instance.

If the addon window is already opened and the user clicks the New > MyAddon menu item again to open another window... I don't want the 2nd window to open. Is there a way to do that?

TIA

[NinjaTrader_Gaby]

Hello defa0009,

Thank you for your post.

You could loop through all active windows and detect if another window is open.

Here is a forum post with example code:

https://forum.ninjatrader.com/forum/...te#post1101524

[defa0009]

You could loop through all active windows and detect if another window is open.

Perfect!!!

[defa0009]

The other solution didn't really work for me but it helped me to figure out what I needed to do...

In case anyone else is looking to limit the number of addon windows opened to one instance here is some skeleton code how to it...

namespace NinjaTrader.NinjaScript.AddOns {

    public class MyAddonWindow : NinjaTrader.NinjaScript.AddOnBase {

        private NTMenuItem newWindowMenuItem;
        
        private bool windowOpened = false;

        protected override void OnStateChange() {

            // code goes here
        }

        protected override void OnWindowCreated(Window window) {

            // code goes here
        }

        private void OnMenuItemClick(object sender, RoutedEventArgs e) {

            if(windowOpened == false) {
                
                Globals.RandomDispatcher.InvokeAsync(new Action(() => new MasterWindow().Show()));
                
                windowOpened = true;
            }
        }

        protected override void OnWindowDestroyed(Window window) {

            if(newWindowMenuItem != null && window is ControlCenter) {

                // code goes here
​
            } else if(window is NTWindow) {
                
                NTWindow ntWin = window as NTWindow;
                
                if(ntWin != null && ntWin.Caption.Equals("MasterWindow"))
                    windowOpened = false;
            }
        }
    }

    public class MasterWindow : NTWindow, IWorkspacePersistence {

        public MasterWindow() {

            Caption = "MasterWindow";
        }
    }
}
​