- added IsDisposed to form

- removed FormSwitched from FormBase and added to DeviceSession (more logical message loop)
- added PreviousForm to DeviceSession, contains last opened form (at initial form is null)
-BotBase message loop update
- now navigation is possible from every form, not just the latest ones as before

TelegramBotBase/Base/FormBase.cs

@@ -20,9 +20,9 @@ namespace TelegramBotBase.Form
         public bool CustomEventManagement { get; set; } = false;
 
         /// <summary>
-        /// contains if the form has been switched (navigated)
+        /// has this formular already been disposed ?
         /// </summary>
-        public bool FormSwitched { get; set; } = false;
+        public bool IsDisposed { get; set; } = false;
 
         public List<ControlBase> Controls { get; set; }
 
@@ -117,12 +117,14 @@ namespace TelegramBotBase.Form
             if (ds == null)
                 return;
 
-            this.FormSwitched = true;
+            ds.FormSwitched = true;
 
             ds.ActiveForm = newForm;
             newForm.Client = this.Client;
             newForm.Device = ds;
 
+            ds.PreviousForm = this;
+
             await newForm.Init(args);
 
             await this.Closed();
@@ -137,7 +139,7 @@ namespace TelegramBotBase.Form
         {
             this.Client = null;
             this.Device = null;
-            this.FormSwitched = false;
+            this.IsDisposed = true;
         }
     }
 }

TelegramBotBase/BotBase.cs

@@ -258,6 +258,9 @@ namespace TelegramBotBase
             do
             {
                 i++;
+                
+                //Reset navigation
+                ds.FormSwitched = false;
 
                 activeForm = ds.ActiveForm;
 
@@ -279,10 +282,10 @@ namespace TelegramBotBase
                 }
 
                 //Render Event
-                if (!activeForm.FormSwitched)
+                if (!ds.FormSwitched)
                     await activeForm.Render(e);
 
-            } while (activeForm.FormSwitched && i < NavigationMaximum);
+            } while (ds.FormSwitched && i < NavigationMaximum);
 
         }
 
@@ -329,6 +332,9 @@ namespace TelegramBotBase
             {
                 i++;
 
+                //Reset navigation
+                ds.FormSwitched = false;
+
                 activeForm = ds.ActiveForm;
 
                 //If the form manages the events by itselfs, skip here
@@ -342,7 +348,7 @@ namespace TelegramBotBase
                 await activeForm.Load(e);
 
                 //Action Event
-                if (!activeForm.FormSwitched)
+                if (!ds.FormSwitched)
                 {
                     await activeForm.Action(e);
 
@@ -353,7 +359,7 @@ namespace TelegramBotBase
 
                         if (uhc.Handled)
                         {
-                            if (activeForm.FormSwitched)
+                            if (ds.FormSwitched)
                             {
                                 continue;
                             }
@@ -367,10 +373,10 @@ namespace TelegramBotBase
                 }
 
                 //Render Event
-                if (!activeForm.FormSwitched)
+                if (!ds.FormSwitched)
                     await activeForm.Render(e);
 
-            } while (activeForm.FormSwitched && i < NavigationMaximum);
+            } while (ds.FormSwitched && i < NavigationMaximum);
 
         }
 

TelegramBotBase/Sessions/DeviceSession.cs

@@ -37,6 +37,16 @@ namespace TelegramBotBase.Sessions
         /// </summary>
         public FormBase ActiveForm { get; set; }
 
+        /// <summary>
+        /// Returns the previous shown form
+        /// </summary>
+        public FormBase PreviousForm { get; set; }
+
+        /// <summary>
+        /// contains if the form has been switched (navigated)
+        /// </summary>
+        public bool FormSwitched { get; set; } = false;
+
         /// <summary>
         /// Returns the ID of the last received message.
         /// </summary>