DotNet 4.8.1 build of DotNetBar

PROMS/DotNetBar Source Code/Controls/TabbedForm/MultiFormAppContext.cs

@@ -0,0 +1,100 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Windows.Forms;
+
+namespace DevComponents.DotNetBar
+{
+    public class MultiFormAppContext : ApplicationContext
+    {
+        private List<WeakReference> _OpenedForms = new List<WeakReference>();
+
+        public MultiFormAppContext(Form initialForm)
+        {
+            // Handle the ApplicationExit event to know when the application is exiting.
+            Application.ApplicationExit += new EventHandler(this.OnApplicationExit);
+            WeakReference reference=new WeakReference(initialForm);
+            _OpenedForms.Add(reference);
+            initialForm.FormClosed += FormClosed;
+            initialForm.Show();
+        }
+
+        public void RegisterOpenForm(Form form)
+        {
+            bool opened = false;
+            foreach (WeakReference item in _OpenedForms)
+            {
+                object target = item.Target;
+
+                if (target != null && target.Equals(form))
+                {
+                    opened = true;
+                    break;
+                }
+            }
+
+            if (!opened)
+            {
+                WeakReference reference = new WeakReference(form);
+                _OpenedForms.Add(reference);
+                form.FormClosed += FormClosed;
+            }
+        }
+        /// <summary>
+        /// Returns read-only list of opened forms. 
+        /// </summary>
+        public List<Form> OpenedForms
+        {
+            get
+            {
+                List<Form> list=new List<Form>();
+                foreach (WeakReference item in _OpenedForms)
+                {
+                    object target = item.Target;
+                    if (target != null && target is Form)
+                    {
+                        list.Add((Form)target);
+                    }
+                }
+
+                return list;
+            }
+        }
+
+        private void FormClosed(object sender, FormClosedEventArgs e)
+        {
+            Form form = (Form) sender;
+            form.FormClosed -= FormClosed;
+            foreach (WeakReference item in _OpenedForms)
+            {
+                object target = item.Target;
+
+                if (target != null && target.Equals(form))
+                {
+                    _OpenedForms.Remove(item);
+                    break;
+                }
+            }
+
+            if(_OpenedForms.Count==0)
+                ExitThread();
+        }
+
+        protected  virtual void OnApplicationExit(object sender, EventArgs e)
+        {
+            
+        }
+
+        private static MultiFormAppContext _CurrentMultiFormAppContext=null;
+        /// <summary>
+        /// Gets or sets current MultiFormAppContext context. If you are using MultiFormAppContext to start your app then you should also
+        /// set that instance of MultiFormAppContext to this property so internally TabFormControl can register any new deattached forms 
+        /// and prevent application from closing if startup form is closed first.
+        /// </summary>
+        public static MultiFormAppContext Current
+        {
+            get { return _CurrentMultiFormAppContext; }
+            set { _CurrentMultiFormAppContext = value; }
+        }
+    }
+}