Add live display support

This commit also adds functionality to LiveRenderable that should
fix some problems related to vertical overflow.

Closes #316
Closes #415

docs/input/live/index.cshtml

@@ -1,4 +1,4 @@
-Title: Live Displays
+Title: Live
 Order: 4
 ---
 

docs/input/live/live-display.md

@@ -0,0 +1,62 @@
+Title: Live Display
+Order: 0
+---
+
+Spectre.Console can update arbitrary widgets in-place. 
+
+<?# Alert ?>
+  The live display is not 
+  thread safe, and using it together with other interactive components such as 
+  prompts, status displays or other progress displays are not supported.
+<?#/ Alert ?>
+
+```csharp
+var table = new Table().Centered();
+
+AnsiConsole.Live(table)
+    .Start(ctx => 
+    {
+        table.AddColumn("Foo");
+        ctx.Refresh();
+        Thread.Sleep(1000);
+
+        table.AddColumn("Bar");
+        ctx.Refresh();
+        Thread.Sleep(1000);
+    });
+```
+
+## Asynchronous progress
+
+If you prefer to use async/await, you can use `StartAsync` instead of `Start`.
+
+```csharp
+var table = new Table().Centered();
+
+await AnsiConsole.Live(table)
+    .StartAsync(async ctx => 
+    {
+        table.AddColumn("Foo");
+        ctx.Refresh();
+        await Task.Delay(1000);
+
+        table.AddColumn("Bar");
+        ctx.Refresh();
+        await Task.Delay(1000);
+    });
+```
+
+## Configure
+
+```csharp
+var table = new Table().Centered();
+
+AnsiConsole.Live(table)
+    .AutoClear(false)   // Do not remove when done
+    .Overflow(VerticalOverflow.Ellipsis) // Show ellipsis when overflowing
+    .Cropping(VerticalOverflowCropping.Top) // Crop overflow at top
+    .Start(ctx =>
+    {
+        // Omitted
+    });
+```

docs/input/live/progress.md

@@ -66,7 +66,6 @@ await AnsiConsole.Progress()
 ## Configure
 
 ```csharp
-// Asynchronous
 AnsiConsole.Progress()
     .AutoRefresh(false) // Turn off auto refresh
     .AutoClear(false)   // Do not remove the task list when done

docs/input/live/status.md

@@ -1,5 +1,5 @@
 Title: Status
-Order: 6
+Order: 10
 RedirectFrom: status
 ---
 

examples/Console/Live/Live.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <ExampleTitle>Live</ExampleTitle>
+    <ExampleDescription>Demonstrates how to do live updates.</ExampleDescription>
+    <ExampleGroup>Misc</ExampleGroup>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\Shared\Shared.csproj" />
+  </ItemGroup>
+
+</Project>

examples/Console/Live/Program.cs

@@ -0,0 +1,108 @@
+using System;
+using System.Threading;
+
+namespace Spectre.Console.Examples
+{
+    public static class Program
+    {
+        public static void Main()
+        {
+            var table = new Table().Centered();
+
+            // Animate
+            AnsiConsole.Live(table)
+                .AutoClear(false)
+                .Overflow(VerticalOverflow.Ellipsis)
+                .Cropping(VerticalOverflowCropping.Top)
+                .Start(ctx =>
+                {
+                    void Update(int delay, Action action)
+                    {
+                        action();
+                        ctx.Refresh();
+                        Thread.Sleep(delay);
+                    }
+
+                    // Columns
+                    Update(230, () => table.AddColumn("Release date"));
+                    Update(230, () => table.AddColumn("Title"));
+                    Update(230, () => table.AddColumn("Budget"));
+                    Update(230, () => table.AddColumn("Opening Weekend"));
+                    Update(230, () => table.AddColumn("Box office"));
+
+                    // Rows
+                    Update(70, () => table.AddRow("May 25, 1977", "[yellow]Star Wars[/] [grey]Ep.[/] [u]IV[/]", "$11,000,000", "$1,554,475", "$775,398,007"));
+                    Update(70, () => table.AddRow("May 21, 1980", "[yellow]Star Wars[/] [grey]Ep.[/] [u]V[/]", "$18,000,000", "$4,910,483", "$547,969,004"));
+                    Update(70, () => table.AddRow("May 25, 1983", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VI[/]", "$32,500,000", "$23,019,618", "$475,106,177"));
+                    Update(70, () => table.AddRow("May 19, 1999", "[yellow]Star Wars[/] [grey]Ep.[/] [u]I[/]", "$115,000,000", "$64,810,870", "$1,027,044,677"));
+                    Update(70, () => table.AddRow("May 16, 2002", "[yellow]Star Wars[/] [grey]Ep.[/] [u]II[/]", "$115,000,000", "$80,027,814", "$649,436,358"));
+                    Update(70, () => table.AddRow("May 19, 2005", "[yellow]Star Wars[/] [grey]Ep.[/] [u]III[/]", "$113,000,000", "$108,435,841", "$850,035,635"));
+                    Update(70, () => table.AddRow("Dec 18, 2015", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VII[/]", "$245,000,000", "$247,966,675", "$2,068,223,624"));
+                    Update(70, () => table.AddRow("Dec 15, 2017", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VIII[/]", "$317,000,000", "$220,009,584", "$1,333,539,889"));
+                    Update(70, () => table.AddRow("Dec 20, 2019", "[yellow]Star Wars[/] [grey]Ep.[/] [u]IX[/]", "$245,000,000", "$177,383,864", "$1,074,114,248"));
+                    Update(70, () => table.AddRow("May 25, 1977", "[yellow]Star Wars[/] [grey]Ep.[/] [u]IV[/]", "$11,000,000", "$1,554,475", "$775,398,007"));
+                    Update(70, () => table.AddRow("May 21, 1980", "[yellow]Star Wars[/] [grey]Ep.[/] [u]V[/]", "18,000,000", "$4,910,483", "$547,969,004"));
+                    Update(70, () => table.AddRow("May 25, 1983", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VI[/]", "$32,500,000", "$23,019,618", "$475,106,177"));
+                    Update(70, () => table.AddRow("May 19, 1999", "[yellow]Star Wars[/] [grey]Ep.[/] [u]I[/]", "$115,000,000", "$64,810,870", "$1,027,044,677"));
+                    Update(70, () => table.AddRow("May 16, 2002", "[yellow]Star Wars[/] [grey]Ep.[/] [u]II[/]", "$115,000,000", "$80,027,814", "$649,436,358"));
+                    Update(70, () => table.AddRow("May 19, 2005", "[yellow]Star Wars[/] [grey]Ep.[/] [u]III[/]", "$113,000,000", "$108,435,841", "$850,035,635"));
+                    Update(70, () => table.AddRow("Dec 18, 2015", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VII[/]", "$245,000,000", "$247,966,675", "$2,068,223,624"));
+                    Update(70, () => table.AddRow("Dec 15, 2017", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VIII[/]", "$317,000,000", "$220,009,584", "$1,333,539,889"));
+                    Update(70, () => table.AddRow("Dec 20, 2019", "[yellow]Star Wars[/] [grey]Ep.[/] [u]IX[/]", "$245,000,000", "$177,383,864", "$1,074,114,248"));
+                    Update(70, () => table.AddRow("May 25, 1977", "[yellow]Star Wars[/] [grey]Ep.[/] [u]IV[/]", "$11,000,000", "$1,554,475", "$775,398,007"));
+                    Update(70, () => table.AddRow("May 21, 1980", "[yellow]Star Wars[/] [grey]Ep.[/] [u]V[/]", "18,000,000", "$4,910,483", "$547,969,004"));
+                    Update(70, () => table.AddRow("May 25, 1983", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VI[/]", "$32,500,000", "$23,019,618", "$475,106,177"));
+                    Update(70, () => table.AddRow("May 19, 1999", "[yellow]Star Wars[/] [grey]Ep.[/] [u]I[/]", "$115,000,000", "$64,810,870", "$1,027,044,677"));
+                    Update(70, () => table.AddRow("May 16, 2002", "[yellow]Star Wars[/] [grey]Ep.[/] [u]II[/]", "$115,000,000", "$80,027,814", "$649,436,358"));
+                    Update(70, () => table.AddRow("May 19, 2005", "[yellow]Star Wars[/] [grey]Ep.[/] [u]III[/]", "$113,000,000", "$108,435,841", "$850,035,635"));
+                    Update(70, () => table.AddRow("Dec 18, 2015", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VII[/]", "$245,000,000", "$247,966,675", "$2,068,223,624"));
+                    Update(70, () => table.AddRow("Dec 15, 2017", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VIII[/]", "$317,000,000", "$220,009,584", "$1,333,539,889"));
+                    Update(70, () => table.AddRow("Dec 20, 2019", "[yellow]Star Wars[/] [grey]Ep.[/] [u]IX[/]", "$245,000,000", "$177,383,864", "$1,074,114,248"));
+                    Update(70, () => table.AddRow("May 25, 1977", "[yellow]Star Wars[/] [grey]Ep.[/] [u]IV[/]", "$11,000,000", "$1,554,475", "$775,398,007"));
+                    Update(70, () => table.AddRow("May 21, 1980", "[yellow]Star Wars[/] [grey]Ep.[/] [u]V[/]", "18,000,000", "$4,910,483", "$547,969,004"));
+                    Update(70, () => table.AddRow("May 25, 1983", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VI[/]", "$32,500,000", "$23,019,618", "$475,106,177"));
+                    Update(70, () => table.AddRow("May 19, 1999", "[yellow]Star Wars[/] [grey]Ep.[/] [u]I[/]", "$115,000,000", "$64,810,870", "$1,027,044,677"));
+                    Update(70, () => table.AddRow("May 16, 2002", "[yellow]Star Wars[/] [grey]Ep.[/] [u]II[/]", "$115,000,000", "$80,027,814", "$649,436,358"));
+                    Update(70, () => table.AddRow("May 19, 2005", "[yellow]Star Wars[/] [grey]Ep.[/] [u]III[/]", "$113,000,000", "$108,435,841", "$850,035,635"));
+                    Update(70, () => table.AddRow("Dec 18, 2015", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VII[/]", "$245,000,000", "$247,966,675", "$2,068,223,624"));
+                    Update(70, () => table.AddRow("Dec 15, 2017", "[yellow]Star Wars[/] [grey]Ep.[/] [u]VIII[/]", "$317,000,000", "$220,009,584", "$1,333,539,889"));
+                    Update(70, () => table.AddRow("Dec 20, 2019", "[yellow]Star Wars[/] [grey]Ep.[/] [u]IX[/]", "$245,000,000", "$177,383,864", "$1,074,114,248"));
+
+                    // Column footer
+                    Update(230, () => table.Columns[2].Footer("$1,633,000,000"));
+                    Update(230, () => table.Columns[3].Footer("$928,119,224"));
+                    Update(400, () => table.Columns[4].Footer("$10,318,030,576"));
+
+                    // Column alignment
+                    Update(230, () => table.Columns[2].RightAligned());
+                    Update(230, () => table.Columns[3].RightAligned());
+                    Update(400, () => table.Columns[4].RightAligned());
+
+                    // Column titles
+                    Update(70, () => table.Columns[0].Header("[bold]Release date[/]"));
+                    Update(70, () => table.Columns[1].Header("[bold]Title[/]"));
+                    Update(70, () => table.Columns[2].Header("[red bold]Budget[/]"));
+                    Update(70, () => table.Columns[3].Header("[green bold]Opening Weekend[/]"));
+                    Update(400, () => table.Columns[4].Header("[blue bold]Box office[/]"));
+
+                    // Footers
+                    Update(70, () => table.Columns[2].Footer("[red bold]$1,633,000,000[/]"));
+                    Update(70, () => table.Columns[3].Footer("[green bold]$928,119,224[/]"));
+                    Update(400, () => table.Columns[4].Footer("[blue bold]$10,318,030,576[/]"));
+
+                    // Title
+                    Update(500, () => table.Title("Star Wars Movies"));
+                    Update(400, () => table.Title("[[ [yellow]Star Wars Movies[/] ]]"));
+
+                    // Borders
+                    Update(230, () => table.BorderColor(Color.Yellow));
+                    Update(230, () => table.MinimalBorder());
+                    Update(230, () => table.SimpleBorder());
+                    Update(230, () => table.SimpleHeavyBorder());
+
+                    // Caption
+                    Update(400, () => table.Caption("[[ [blue]THE END[/] ]]"));
+                });
+        }
+    }
+}

examples/Console/Tables/Program.cs

@@ -4,11 +4,7 @@ namespace Spectre.Console.Examples
     {
         public static void Main()
         {
-            // Create the table.
+            AnsiConsole.Render(CreateTable());
-            var table = CreateTable();
-
-            // Render the table.
-            AnsiConsole.Render(table);
         }
 
         private static Table CreateTable()

src/Spectre.Console.sln

@@ -88,6 +88,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Shared", "..\examples\Share
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Internal", "Internal", "{0FC844AD-FCBB-4B2F-9AEC-6CB5505E49E3}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Live", "..\examples\Console\Live\Live.csproj", "{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -458,6 +460,18 @@ Global
 		{8428A7DD-29FC-4417-9CA0-B90D34B26AB2}.Release|x64.Build.0 = Release|Any CPU
 		{8428A7DD-29FC-4417-9CA0-B90D34B26AB2}.Release|x86.ActiveCfg = Release|Any CPU
 		{8428A7DD-29FC-4417-9CA0-B90D34B26AB2}.Release|x86.Build.0 = Release|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Debug|x64.Build.0 = Debug|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Debug|x86.Build.0 = Debug|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Release|x64.ActiveCfg = Release|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Release|x64.Build.0 = Release|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Release|x86.ActiveCfg = Release|Any CPU
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -493,6 +507,7 @@ Global
 		{4C30C028-E97D-4B4C-AD17-C90F338A4DFF} = {F0575243-121F-4DEE-9F6B-246E26DC0844}
 		{A0C772BA-C5F4-451D-AA7A-4045F2FA0201} = {F0575243-121F-4DEE-9F6B-246E26DC0844}
 		{8428A7DD-29FC-4417-9CA0-B90D34B26AB2} = {A0C772BA-C5F4-451D-AA7A-4045F2FA0201}
+		{E607AA2A-A4A6-48E4-8AAB-B0EB74EACAA1} = {F0575243-121F-4DEE-9F6B-246E26DC0844}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {5729B071-67A0-48FB-8B1B-275E6822086C}

src/Spectre.Console/AnsiConsole.Live.cs

@@ -0,0 +1,20 @@
+using Spectre.Console.Rendering;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// A console capable of writing ANSI escape sequences.
+    /// </summary>
+    public static partial class AnsiConsole
+    {
+        /// <summary>
+        /// Creates a new <see cref="LiveDisplay"/> instance.
+        /// </summary>
+        /// <param name="target">The target renderable to update.</param>
+        /// <returns>A <see cref="LiveDisplay"/> instance.</returns>
+        public static LiveDisplay Live(IRenderable target)
+        {
+            return Console.Live(target);
+        }
+    }
+}

src/Spectre.Console/Extensions/AnsiConsoleExtensions.Live.cs

@@ -0,0 +1,32 @@
+using System;
+using Spectre.Console.Rendering;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="IAnsiConsole"/>.
+    /// </summary>
+    public static partial class AnsiConsoleExtensions
+    {
+        /// <summary>
+        /// Creates a new <see cref="LiveDisplay"/> instance for the console.
+        /// </summary>
+        /// <param name="console">The console.</param>
+        /// <param name="target">The target renderable to update.</param>
+        /// <returns>A <see cref="LiveDisplay"/> instance.</returns>
+        public static LiveDisplay Live(this IAnsiConsole console, IRenderable target)
+        {
+            if (console is null)
+            {
+                throw new ArgumentNullException(nameof(console));
+            }
+
+            if (target is null)
+            {
+                throw new ArgumentNullException(nameof(target));
+            }
+
+            return new LiveDisplay(console, target);
+        }
+    }
+}

src/Spectre.Console/Extensions/LiveDisplayExtensions.cs

@@ -0,0 +1,65 @@
+using System;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Contains extension methods for <see cref="LiveDisplay"/>.
+    /// </summary>
+    public static class LiveDisplayExtensions
+    {
+        /// <summary>
+        /// Sets whether or not auto clear is enabled.
+        /// If enabled, the live display will be cleared when done.
+        /// </summary>
+        /// <param name="live">The <see cref="LiveDisplay"/> instance.</param>
+        /// <param name="enabled">Whether or not auto clear is enabled.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static LiveDisplay AutoClear(this LiveDisplay live, bool enabled)
+        {
+            if (live is null)
+            {
+                throw new ArgumentNullException(nameof(live));
+            }
+
+            live.AutoClear = enabled;
+
+            return live;
+        }
+
+        /// <summary>
+        /// Sets the vertical overflow strategy.
+        /// </summary>
+        /// <param name="live">The <see cref="LiveDisplay"/> instance.</param>
+        /// <param name="overflow">The overflow strategy to use.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static LiveDisplay Overflow(this LiveDisplay live, VerticalOverflow overflow)
+        {
+            if (live is null)
+            {
+                throw new ArgumentNullException(nameof(live));
+            }
+
+            live.Overflow = overflow;
+
+            return live;
+        }
+
+        /// <summary>
+        /// Sets the vertical overflow cropping strategy.
+        /// </summary>
+        /// <param name="live">The <see cref="LiveDisplay"/> instance.</param>
+        /// <param name="cropping">The overflow cropping strategy to use.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static LiveDisplay Cropping(this LiveDisplay live, VerticalOverflowCropping cropping)
+        {
+            if (live is null)
+            {
+                throw new ArgumentNullException(nameof(live));
+            }
+
+            live.Cropping = cropping;
+
+            return live;
+        }
+    }
+}

src/Spectre.Console/Extensions/TableColumnExtensions.cs

@@ -8,11 +8,55 @@ namespace Spectre.Console
     /// </summary>
     public static class TableColumnExtensions
     {
+        /// <summary>
+        /// Sets the table column header.
+        /// </summary>
+        /// <param name="column">The table column.</param>
+        /// <param name="header">The table column header markup text.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static TableColumn Header(this TableColumn column, string header)
+        {
+            if (column is null)
+            {
+                throw new ArgumentNullException(nameof(column));
+            }
+
+            if (header is null)
+            {
+                throw new ArgumentNullException(nameof(header));
+            }
+
+            column.Header = new Markup(header);
+            return column;
+        }
+
+        /// <summary>
+        /// Sets the table column header.
+        /// </summary>
+        /// <param name="column">The table column.</param>
+        /// <param name="header">The table column header.</param>
+        /// <returns>The same instance so that multiple calls can be chained.</returns>
+        public static TableColumn Header(this TableColumn column, IRenderable header)
+        {
+            if (column is null)
+            {
+                throw new ArgumentNullException(nameof(column));
+            }
+
+            if (header is null)
+            {
+                throw new ArgumentNullException(nameof(header));
+            }
+
+            column.Footer = header;
+            return column;
+        }
+
         /// <summary>
         /// Sets the table column footer.
         /// </summary>
         /// <param name="column">The table column.</param>
-        /// <param name="footer">The table column markup text.</param>
+        /// <param name="footer">The table column footer markup text.</param>
         /// <returns>The same instance so that multiple calls can be chained.</returns>
         public static TableColumn Footer(this TableColumn column, string footer)
         {

src/Spectre.Console/Rendering/LiveRenderable.cs

@@ -1,4 +1,6 @@
+using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using static Spectre.Console.AnsiSequences;
 
 namespace Spectre.Console.Rendering
@@ -6,12 +8,33 @@ namespace Spectre.Console.Rendering
     internal sealed class LiveRenderable : Renderable
     {
         private readonly object _lock = new object();
+        private readonly IAnsiConsole _console;
         private IRenderable? _renderable;
         private SegmentShape? _shape;
 
-        public bool HasRenderable => _renderable != null;
+        public IRenderable? Target => _renderable;
+        public bool DidOverflow { get; private set; }
 
-        public void SetRenderable(IRenderable renderable)
+        [MemberNotNullWhen(true, nameof(Target))]
+        public bool HasRenderable => _renderable != null;
+        public VerticalOverflow Overflow { get; set; }
+        public VerticalOverflowCropping OverflowCropping { get; set; }
+
+        public LiveRenderable(IAnsiConsole console)
+        {
+            _console = console ?? throw new ArgumentNullException(nameof(console));
+
+            Overflow = VerticalOverflow.Ellipsis;
+            OverflowCropping = VerticalOverflowCropping.Top;
+        }
+
+        public LiveRenderable(IAnsiConsole console, IRenderable renderable)
+            : this(console)
+        {
+            _renderable = renderable ?? throw new ArgumentNullException(nameof(renderable));
+        }
+
+        public void SetRenderable(IRenderable? renderable)
         {
             lock (_lock)
             {
@@ -51,12 +74,61 @@ namespace Spectre.Console.Rendering
         {
             lock (_lock)
             {
+                DidOverflow = false;
+
                 if (_renderable != null)
                 {
                     var segments = _renderable.Render(context, maxWidth);
                     var lines = Segment.SplitLines(segments);
 
                     var shape = SegmentShape.Calculate(context, lines);
+                    if (shape.Height > _console.Profile.Height)
+                    {
+                        if (Overflow == VerticalOverflow.Crop)
+                        {
+                            if (OverflowCropping == VerticalOverflowCropping.Bottom)
+                            {
+                                // Remove bottom lines
+                                var index = Math.Min(_console.Profile.Height, lines.Count);
+                                var count = lines.Count - index;
+                                lines.RemoveRange(index, count);
+                            }
+                            else
+                            {
+                                // Remove top lines
+                                var start = lines.Count - _console.Profile.Height;
+                                lines.RemoveRange(0, start);
+                            }
+
+                            shape = SegmentShape.Calculate(context, lines);
+                        }
+                        else if (Overflow == VerticalOverflow.Ellipsis)
+                        {
+                            var ellipsisText = _console.Profile.Capabilities.Unicode ? "…" : "...";
+                            var ellipsis = new SegmentLine(((IRenderable)new Markup($"[yellow]{ellipsisText}[/]")).Render(context, maxWidth));
+
+                            if (OverflowCropping == VerticalOverflowCropping.Bottom)
+                            {
+                                // Remove bottom lines
+                                var index = Math.Min(_console.Profile.Height - 1, lines.Count);
+                                var count = lines.Count - index;
+                                lines.RemoveRange(index, count);
+                                lines.Add(ellipsis);
+                            }
+                            else
+                            {
+                                // Remove top lines
+                                var start = lines.Count - _console.Profile.Height;
+                                lines.RemoveRange(0, start + 1);
+                                lines.Insert(0, ellipsis);
+                            }
+
+                            shape = SegmentShape.Calculate(context, lines);
+                        }
+
+                        DidOverflow = true;
+                    }
+
                     _shape = _shape == null ? shape : _shape.Value.Inflate(shape);
                     _shape.Value.Apply(context, ref lines);
 

src/Spectre.Console/Rendering/SegmentLine.cs

@@ -13,6 +13,22 @@ namespace Spectre.Console.Rendering
         /// </summary>
         public int Length => this.Sum(line => line.Text.Length);
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SegmentLine"/> class.
+        /// </summary>
+        public SegmentLine()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SegmentLine"/> class.
+        /// </summary>
+        /// <param name="segments">The segments.</param>
+        public SegmentLine(IEnumerable<Segment> segments)
+            : base(segments)
+        {
+        }
+
         /// <summary>
         /// Gets the number of cells the segment line occupies.
         /// </summary>

src/Spectre.Console/VerticalOverflow.cs

@@ -0,0 +1,23 @@
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Represents vertical overflow.
+    /// </summary>
+    public enum VerticalOverflow
+    {
+        /// <summary>
+        /// Crop overflow.
+        /// </summary>
+        Crop = 0,
+
+        /// <summary>
+        /// Add an ellipsis at the end.
+        /// </summary>
+        Ellipsis = 1,
+
+        /// <summary>
+        /// Do not do anything about overflow.
+        /// </summary>
+        Visible = 2,
+    }
+}

src/Spectre.Console/VerticalOverflowCropping.cs

@@ -0,0 +1,18 @@
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Represent vertical overflow cropping.
+    /// </summary>
+    public enum VerticalOverflowCropping
+    {
+        /// <summary>
+        /// Crops the top.
+        /// </summary>
+        Top = 0,
+
+        /// <summary>
+        /// Crops the bottom.
+        /// </summary>
+        Bottom = 1,
+    }
+}

src/Spectre.Console/Widgets/Live/LiveDisplay.cs

@@ -0,0 +1,126 @@
+using System;
+using System.Threading.Tasks;
+using Spectre.Console.Rendering;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Represents a live display.
+    /// </summary>
+    public sealed class LiveDisplay
+    {
+        private readonly IAnsiConsole _console;
+        private readonly IRenderable _target;
+
+        /// <summary>
+        /// Gets or sets a value indicating whether or not the live display should
+        /// be cleared when it's done.
+        /// Defaults to <c>false</c>.
+        /// </summary>
+        public bool AutoClear { get; set; }
+
+        /// <summary>
+        /// Gets or sets the vertical overflow strategy.
+        /// </summary>
+        public VerticalOverflow Overflow { get; set; } = VerticalOverflow.Ellipsis;
+
+        /// <summary>
+        /// Gets or sets the vertical overflow cropping strategy.
+        /// </summary>
+        public VerticalOverflowCropping Cropping { get; set; } = VerticalOverflowCropping.Top;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LiveDisplay"/> class.
+        /// </summary>
+        /// <param name="console">The console.</param>
+        /// <param name="target">The target renderable to update.</param>
+        public LiveDisplay(IAnsiConsole console, IRenderable target)
+        {
+            _console = console ?? throw new ArgumentNullException(nameof(console));
+            _target = target ?? throw new ArgumentNullException(nameof(target));
+        }
+
+        /// <summary>
+        /// Starts the live display.
+        /// </summary>
+        /// <param name="action">The action to execute.</param>
+        public void Start(Action<LiveDisplayContext> action)
+        {
+            var task = StartAsync(ctx =>
+            {
+                action(ctx);
+                return Task.CompletedTask;
+            });
+
+            task.GetAwaiter().GetResult();
+        }
+
+        /// <summary>
+        /// Starts the live display.
+        /// </summary>
+        /// <typeparam name="T">The result type.</typeparam>
+        /// <param name="func">The action to execute.</param>
+        /// <returns>The result.</returns>
+        public T Start<T>(Func<LiveDisplayContext, T> func)
+        {
+            var task = StartAsync(ctx => Task.FromResult(func(ctx)));
+            return task.GetAwaiter().GetResult();
+        }
+
+        /// <summary>
+        /// Starts the live display.
+        /// </summary>
+        /// <param name="func">The action to execute.</param>
+        /// <returns>The result.</returns>
+        public async Task StartAsync(Func<LiveDisplayContext, Task> func)
+        {
+            if (func is null)
+            {
+                throw new ArgumentNullException(nameof(func));
+            }
+
+            _ = await StartAsync<object?>(async ctx =>
+            {
+                await func(ctx).ConfigureAwait(false);
+                return default;
+            }).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Starts the live display.
+        /// </summary>
+        /// <typeparam name="T">The result type.</typeparam>
+        /// <param name="func">The action to execute.</param>
+        /// <returns>The result.</returns>
+        public async Task<T> StartAsync<T>(Func<LiveDisplayContext, Task<T>> func)
+        {
+            if (func is null)
+            {
+                throw new ArgumentNullException(nameof(func));
+            }
+
+            return await _console.RunExclusive(async () =>
+            {
+                var context = new LiveDisplayContext(_console, _target);
+                context.SetOverflow(Overflow, Cropping);
+
+                var renderer = new LiveDisplayRenderer(_console, context);
+                renderer.Started();
+
+                try
+                {
+                    using (new RenderHookScope(_console, renderer))
+                    {
+                        var result = await func(context).ConfigureAwait(false);
+                        context.Refresh();
+                        return result;
+                    }
+                }
+                finally
+                {
+                    renderer.Completed(AutoClear);
+                }
+            }).ConfigureAwait(false);
+        }
+    }
+}

src/Spectre.Console/Widgets/Live/LiveDisplayContext.cs

@@ -0,0 +1,54 @@
+using System;
+using Spectre.Console.Rendering;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Represents a context that can be used to interact with a <see cref="LiveDisplay"/>.
+    /// </summary>
+    public sealed class LiveDisplayContext
+    {
+        private readonly IAnsiConsole _console;
+
+        internal object Lock { get; }
+        internal LiveRenderable Live { get; }
+
+        internal LiveDisplayContext(IAnsiConsole console, IRenderable target)
+        {
+            _console = console ?? throw new ArgumentNullException(nameof(console));
+
+            Live = new LiveRenderable(_console, target);
+            Lock = new object();
+        }
+
+        /// <summary>
+        /// Updates the live display target.
+        /// </summary>
+        /// <param name="target">The new live display target.</param>
+        public void UpdateTarget(IRenderable? target)
+        {
+            lock (Lock)
+            {
+                Live.SetRenderable(target);
+                Refresh();
+            }
+        }
+
+        /// <summary>
+        /// Refreshes the live display.
+        /// </summary>
+        public void Refresh()
+        {
+            lock (Lock)
+            {
+                _console.Write(new ControlCode(string.Empty));
+            }
+        }
+
+        internal void SetOverflow(VerticalOverflow overflow, VerticalOverflowCropping cropping)
+        {
+            Live.Overflow = overflow;
+            Live.OverflowCropping = cropping;
+        }
+    }
+}

src/Spectre.Console/Widgets/Live/LiveDisplayRenderer.cs

@@ -0,0 +1,62 @@
+using System.Collections.Generic;
+using Spectre.Console.Rendering;
+
+namespace Spectre.Console
+{
+    internal sealed class LiveDisplayRenderer : IRenderHook
+    {
+        private readonly IAnsiConsole _console;
+        private readonly LiveDisplayContext _context;
+
+        public LiveDisplayRenderer(IAnsiConsole console, LiveDisplayContext context)
+        {
+            _console = console;
+            _context = context;
+        }
+
+        public void Started()
+        {
+            _console.Cursor.Hide();
+        }
+
+        public void Completed(bool autoclear)
+        {
+            lock (_context.Lock)
+            {
+                if (autoclear)
+                {
+                    _console.Write(_context.Live.RestoreCursor());
+                }
+                else
+                {
+                    if (_context.Live.HasRenderable && _context.Live.DidOverflow)
+                    {
+                        // Redraw the whole live renderable
+                        _console.Write(_context.Live.RestoreCursor());
+                        _context.Live.Overflow = VerticalOverflow.Visible;
+                        _console.Write(_context.Live.Target);
+                    }
+
+                    _console.WriteLine();
+                }
+
+                _console.Cursor.Show();
+            }
+        }
+
+        public IEnumerable<IRenderable> Process(RenderContext context, IEnumerable<IRenderable> renderables)
+        {
+            lock (_context.Lock)
+            {
+                yield return _context.Live.PositionCursor();
+
+                foreach (var renderable in renderables)
+                {
+                    yield return renderable;
+                }
+
+                yield return _context.Live;
+            }
+        }
+    }
+}

src/Spectre.Console/Widgets/Progress/Renderers/DefaultProgressRenderer.cs

@@ -13,8 +13,8 @@ namespace Spectre.Console
         private readonly LiveRenderable _live;
         private readonly object _lock;
         private readonly Stopwatch _stopwatch;
+        private readonly bool _hideCompleted;
         private TimeSpan _lastUpdate;
-        private bool _hideCompleted;
 
         public override TimeSpan RefreshRate { get; }
 
@@ -22,7 +22,7 @@ namespace Spectre.Console
         {
             _console = console ?? throw new ArgumentNullException(nameof(console));
             _columns = columns ?? throw new ArgumentNullException(nameof(columns));
-            _live = new LiveRenderable();
+            _live = new LiveRenderable(console);
             _lock = new object();
             _stopwatch = new Stopwatch();
             _lastUpdate = TimeSpan.Zero;
@@ -46,6 +46,14 @@ namespace Spectre.Console
                 }
                 else
                 {
+                    if (_live.HasRenderable && _live.DidOverflow)
+                    {
+                        // Redraw the whole live renderable
+                        _console.Write(_live.RestoreCursor());
+                        _live.Overflow = VerticalOverflow.Visible;
+                        _console.Write(_live.Target);
+                    }
+
                     _console.WriteLine();
                 }
 

src/Spectre.Console/Widgets/Prompt/List/ListPromptRenderHook.cs

@@ -7,20 +7,21 @@ namespace Spectre.Console
     internal sealed class ListPromptRenderHook<T> : IRenderHook
         where T : notnull
     {
-        private readonly LiveRenderable _live;
-        private readonly object _lock;
         private readonly IAnsiConsole _console;
         private readonly Func<IRenderable> _builder;
+        private readonly LiveRenderable _live;
+        private readonly object _lock;
         private bool _dirty;
 
         public ListPromptRenderHook(
             IAnsiConsole console,
             Func<IRenderable> builder)
         {
-            _live = new LiveRenderable();
+            _console = console ?? throw new ArgumentNullException(nameof(console));
+            _builder = builder ?? throw new ArgumentNullException(nameof(builder));
+
+            _live = new LiveRenderable(console);
             _lock = new object();
-            _console = console;
-            _builder = builder;
             _dirty = true;
         }
 

src/Spectre.Console/Widgets/Table/TableColumn.cs

@@ -9,9 +9,9 @@ namespace Spectre.Console
     public sealed class TableColumn : IColumn
     {
         /// <summary>
-        /// Gets the column header.
+        /// Gets or sets the column header.
         /// </summary>
-        public IRenderable Header { get; }
+        public IRenderable Header { get; set; }
 
         /// <summary>
         /// Gets or sets the column footer.