finally more structure

OwnChar.App.Desktop/Api/IMainWindowApi.cs

@@ -1,10 +1,14 @@
-using System.Windows.Forms;
+using OwnChar.Manager;
+using System.Windows.Forms;
 
 namespace OwnChar.App.Desktop.Api
 {
     public interface IMainWindowApi
     {
-        void OpenTab(Control content);
+        OwnCharManager? Manager { get; }
+        void OpenTab(Control content, string title);
         void CloseTab(Control content);
+        bool IsTabOpen(Control content);
+        bool IsTabOpen<T>();
     }
 }

OwnChar.App.Desktop/Api/IOwnCharApi.cs

@@ -1,4 +1,5 @@
-using System;
+using Pilz.Configuration;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -8,7 +9,7 @@ namespace OwnChar.App.Desktop.Api
 {
     public interface IOwnCharApi
     {
-        public static IOwnCharApi Instance { get; } = new AppApi();
-        public IMainWindowApi? MainWindow { get; internal set; }
+        public abstract IMainWindowApi? MainWindow { get; }
+        public abstract ISettings? Settings { get; }
     }
 }

OwnChar.App.Desktop/Api/Parameters/AppInitParams.cs

@@ -0,0 +1,14 @@
+using OwnChar.Plugins;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OwnChar.App.Desktop.Api.Parameters
+{
+    public class AppInitParams(IOwnCharApi api) : OwnCharPluginInitParams
+    {
+        public IOwnCharApi Api { get; set; } = api;
+    }
+}

OwnChar.App.Desktop/Api/Parameters/MainWindowParams.cs

@@ -0,0 +1,14 @@
+using Pilz.Plugins.Advanced;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OwnChar.App.Desktop.Api.Parameters
+{
+    public class MainWindowParams(IMainWindowApi api) : PluginFunctionParameter
+    {
+        public IMainWindowApi Api { get; } = api;
+    }
+}