Merge pull request #3849 from BDisp/v2_3847_tabview-focus-fix

Fixes #3847. TabView changes focus to Tab on Layout.

Author: tig

Terminal.Gui/Views/TabView/TabRowView.cs renamed to Terminal.Gui/Views/TabView/TabRow.cs

@@ -1,18 +1,19 @@
 #nullable enable
 namespace Terminal.Gui;
 
-internal class TabRowView : View
+internal class TabRow : View
 {
     private readonly TabView _host;
     private readonly View _leftScrollIndicator;
     private readonly View _rightScrollIndicator;
 
-    public TabRowView (TabView host)
+    public TabRow (TabView host)
     {
         _host = host;
-        Id = "tabRowView";
+        Id = "tabRow";
 
         CanFocus = true;
+        TabStop = TabBehavior.TabGroup;
         Width = Dim.Fill ();
 
         _rightScrollIndicator = new View
@@ -59,25 +60,25 @@ protected override bool OnMouseEvent (MouseEventArgs me)
             }
         }
 
-        if (!me.IsSingleDoubleOrTripleClicked)
+        if (me.IsWheel && !HasFocus && CanFocus)
         {
-            return false;
+            SetFocus ();
         }
 
-        if (!HasFocus && CanFocus)
+        if (me is { IsSingleDoubleOrTripleClicked: false, IsWheel: false })
         {
-            SetFocus ();
+            return false;
         }
 
-        if (me.IsSingleDoubleOrTripleClicked)
+        if (me.IsSingleDoubleOrTripleClicked || me.IsWheel)
         {
             var scrollIndicatorHit = 0;
 
-            if (me.View is { Id: "rightScrollIndicator" })
+            if (me.View is { Id: "rightScrollIndicator" } || me.Flags.HasFlag (MouseFlags.WheeledDown) || me.Flags.HasFlag (MouseFlags.WheeledRight))
             {
                 scrollIndicatorHit = 1;
             }
-            else if (me.View is { Id: "leftScrollIndicator" })
+            else if (me.View is { Id: "leftScrollIndicator" } || me.Flags.HasFlag (MouseFlags.WheeledUp) || me.Flags.HasFlag (MouseFlags.WheeledLeft))
             {
                 scrollIndicatorHit = -1;
             }

Terminal.Gui/Views/TabView/TabView.cs

@@ -16,7 +16,7 @@ public class TabView : View
     private readonly List<Tab> _tabs = new ();
 
     /// <summary>This sub view is the 2 or 3 line control that represents the actual tabs themselves.</summary>
-    private readonly TabRowView _tabsBar;
+    private readonly TabRow _tabsBar;
 
     private Tab? _selectedTab;
 
@@ -28,7 +28,7 @@ public TabView ()
     {
         CanFocus = true;
         TabStop = TabBehavior.TabStop; // Because TabView has focusable subviews, it must be a TabGroup
-        _tabsBar = new TabRowView (this);
+        _tabsBar = new TabRow (this);
         _containerView = new ();
         ApplyStyleChanges ();
 
@@ -518,6 +518,10 @@ internal IEnumerable<Tab> CalculateViewport (Rectangle bounds)
         {
             SelectedTab?.SetFocus ();
         }
+        else
+        {
+            SelectedTab?.View?.SetFocus ();
+        }
     }
 
     /// <summary>