SelectableTextBlock implemented for linux

src/Consolonia.Core/Dummy/DummyConsole.cs

@@ -34,6 +34,8 @@ public bool CaretVisible
 
         public bool SupportsComplexEmoji => true;
         public bool SupportsAltSolo => false;
+        public bool SupportsMouse => false;
+        public bool SupportsMouseMove => false;
 
         public void ClearOutput()
         {

src/Consolonia.Core/Infrastructure/DefaultNetConsole.cs

@@ -48,6 +48,8 @@ public DefaultNetConsole()
         }
 
         public override bool SupportsAltSolo => false;
+        public override bool SupportsMouse => false;
+        public override bool SupportsMouseMove => false;
 
         protected override void Dispose(bool disposing)
         {

src/Consolonia.Core/Infrastructure/IConsole.cs

@@ -22,6 +22,8 @@ public interface IConsole : IDisposable
         bool SupportsComplexEmoji { get; }
 
         bool SupportsAltSolo { get; }
+        bool SupportsMouse { get; }
+        bool SupportsMouseMove { get; }
 
         void SetTitle(string title);
 

src/Consolonia.Core/Infrastructure/InputLessDefaultNetConsole.cs

@@ -37,6 +37,8 @@ protected InputLessDefaultNetConsole()
 
         public bool SupportsComplexEmoji => _supportEmoji ?? false;
         public abstract bool SupportsAltSolo { get; }
+        public abstract bool SupportsMouse { get; }
+        public abstract bool SupportsMouseMove { get; }
 
         public void SetTitle(string title)
         {

src/Consolonia.Core/InternalHelpers/CommonInternalHelper.cs

@@ -3,7 +3,7 @@
 
 namespace Consolonia.Core.InternalHelpers
 {
-    internal static class CommonInternalHelper
+    public static class CommonInternalHelper
     {
         public static bool IsNearlyEqual(this double value, double compareTo)
         {

src/Consolonia.NUnit/UnitTestConsole.cs

@@ -40,6 +40,8 @@ public void Dispose()
 
         public bool SupportsComplexEmoji => true;
         public bool SupportsAltSolo => true;
+        public bool SupportsMouse => false;
+        public bool SupportsMouseMove => false;
 
         public void SetTitle(string title)
         {

src/Consolonia.PlatformSupport/CursesConsole.cs

@@ -116,6 +116,8 @@ public CursesConsole()
         }
 
         public override bool SupportsAltSolo => false;
+        public override bool SupportsMouse => true;
+        public override bool SupportsMouseMove => false;
 
         private void StartEventLoop()
         {

src/Consolonia.PlatformSupport/WindowsConsole.cs

@@ -62,6 +62,8 @@ public Win32Console()
         }
 
         public override bool SupportsAltSolo => true;
+        public override bool SupportsMouse => true;
+        public override bool SupportsMouseMove => true;
 
         public override void PauseIO(Task task)
         {

src/Consolonia.Themes/Templates/Controls/Helpers/SelectTextWithPointerUpExtension.cs

@@ -0,0 +1,57 @@
+using System;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Media;
+using Avalonia.Utilities;
+using Consolonia.Core.Helpers;
+using Consolonia.Core.Infrastructure;
+using Consolonia.Core.InternalHelpers;
+
+namespace Consolonia.Themes.Templates.Controls.Helpers
+{
+    internal static class SelectTextWithPointerUpExtension
+    {
+        public static readonly AttachedProperty<bool> SelectOnMouseRightUpProperty =
+            AvaloniaProperty.RegisterAttached<SelectableTextBlock, bool>(CommonInternalHelper.GetStyledPropertyName(),
+                typeof(SelectTextWithPointerUpExtension));
+
+        static SelectTextWithPointerUpExtension()
+        {
+            var console = AvaloniaLocator.Current.GetService<IConsole>();
+            bool supportsMouse = console.SupportsMouse;
+            bool supportsMoveMove = console.SupportsMouseMove;
+            if (!supportsMouse || supportsMoveMove)
+                return;
+
+            SelectOnMouseRightUpProperty.Changed.SubscribeAction(OnPropertyChanged);
+        }
+
+        private static void OnPropertyChanged(AvaloniaPropertyChangedEventArgs<bool> args)
+        {
+            if (args.Sender is not SelectableTextBlock selectableTextBlock) return;
+
+            selectableTextBlock.PointerReleased -= OnPointerReleased;
+
+            if (args.GetNewValue<bool>()) selectableTextBlock.PointerReleased += OnPointerReleased;
+        }
+
+        private static void OnPointerReleased(object sender, PointerReleasedEventArgs e)
+        {
+            // simplified copy of SelectableTextBlock.PointerMove
+            var tb = (SelectableTextBlock)sender;
+
+            Thickness padding = tb.Padding;
+
+            Point point = e.GetPosition(tb) - new Point(padding.Left, padding.Top);
+
+            point = new Point(
+                MathUtilities.Clamp(point.X, 0, Math.Max(tb.TextLayout.WidthIncludingTrailingWhitespace, 0)),
+                MathUtilities.Clamp(point.Y, 0, Math.Max(tb.TextLayout.Height, 0)));
+
+            TextHitTestResult hit = tb.TextLayout.HitTestPoint(point);
+            int textPosition = hit.TextPosition;
+            tb.SetCurrentValue(SelectableTextBlock.SelectionEndProperty, textPosition);
+        }
+    }
+}

src/Consolonia.Themes/Templates/Controls/SelectableTextBlock.axaml

@@ -1,7 +1,11 @@
 <ResourceDictionary xmlns="https://github.com/avaloniaui"
-                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:helpers="clr-namespace:Consolonia.Themes.Templates.Controls.Helpers">
     <ControlTheme x:Key="{x:Type SelectableTextBlock}"
                   TargetType="SelectableTextBlock">
-        <Setter Property="SelectionBrush" Value="{StaticResource ThemeActionBackgroundBrush}"/>
+        <Setter Property="SelectionBrush"
+                Value="{StaticResource ThemeActionBackgroundBrush}" />
+        <Setter Property="helpers:SelectTextWithPointerUpExtension.SelectOnMouseRightUp"
+                Value="True" />
     </ControlTheme>
 </ResourceDictionary>