Initial commit

.editorconfig

@@ -0,0 +1,160 @@
+# editorconfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Default settings:
+# A newline ending every file
+# Use 4 spaces as indentation
+[*]
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+
+# C# files
+[*.cs]
+# New line preferences
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents = true
+csharp_indent_switch_labels = true
+csharp_indent_labels = one_less_than_current
+
+# avoid this. unless absolutely necessary
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+
+# prefer var
+csharp_style_var_for_built_in_types = true
+csharp_style_var_when_type_is_apparent = true
+csharp_style_var_elsewhere = true:suggestion
+
+# use language keywords instead of BCL types
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+
+# name all constant fields using PascalCase
+dotnet_naming_rule.constant_fields_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.constant_fields_should_be_pascal_case.symbols  = constant_fields
+dotnet_naming_rule.constant_fields_should_be_pascal_case.style    = pascal_case_style
+
+dotnet_naming_symbols.constant_fields.applicable_kinds   = field
+dotnet_naming_symbols.constant_fields.required_modifiers = const
+
+dotnet_naming_style.pascal_case_style.capitalization = pascal_case
+
+# static fields should have s_ prefix
+dotnet_naming_rule.static_fields_should_have_prefix.severity = suggestion
+dotnet_naming_rule.static_fields_should_have_prefix.symbols  = static_fields
+dotnet_naming_rule.static_fields_should_have_prefix.style    = static_prefix_style
+
+dotnet_naming_symbols.static_fields.applicable_kinds   = field
+dotnet_naming_symbols.static_fields.required_modifiers = static
+
+dotnet_naming_style.static_prefix_style.required_prefix = s_
+dotnet_naming_style.static_prefix_style.capitalization = camel_case 
+
+# internal and private fields should be _camelCase
+dotnet_naming_rule.camel_case_for_private_internal_fields.severity = suggestion
+dotnet_naming_rule.camel_case_for_private_internal_fields.symbols  = private_internal_fields
+dotnet_naming_rule.camel_case_for_private_internal_fields.style    = camel_case_underscore_style
+
+dotnet_naming_symbols.private_internal_fields.applicable_kinds = field
+dotnet_naming_symbols.private_internal_fields.applicable_accessibilities = private, internal
+
+dotnet_naming_style.camel_case_underscore_style.required_prefix = _
+dotnet_naming_style.camel_case_underscore_style.capitalization = camel_case 
+
+# use accessibility modifiers
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:suggestion
+
+# Code style defaults
+dotnet_sort_system_directives_first = true
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = false
+
+# Expression-level preferences
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+
+# Expression-bodied members
+csharp_style_expression_bodied_methods = false:none
+csharp_style_expression_bodied_constructors = false:none
+csharp_style_expression_bodied_operators = false:none
+csharp_style_expression_bodied_properties = true:none
+csharp_style_expression_bodied_indexers = true:none
+csharp_style_expression_bodied_accessors = true:none
+
+# Pattern matching
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
+
+# Null checking preferences
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_after_comma = true
+csharp_space_after_dot = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_around_declaration_statements = do_not_ignore
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_before_comma = false
+csharp_space_before_dot = false
+csharp_space_before_open_square_brackets = false
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_name_and_open_parenthesis = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_between_square_brackets = false
+
+# Xaml files
+[*.{xaml,axaml}]
+indent_style = space
+indent_size = 2
+
+# Xml project files
+[*.{csproj,vcxproj,vcxproj.filters,proj,nativeproj,locproj}]
+indent_size = 2
+
+# Xml build files
+[*.builds]
+indent_size = 2
+
+# Xml files
+[*.{xml,stylecop,resx,ruleset}]
+indent_size = 2
+
+# Xml config files
+[*.{props,targets,config,nuspec}]
+indent_size = 2
+
+# Shell scripts
+[*.sh]
+end_of_line = lf
+[*.{cmd, bat}]
+end_of_line = crlf

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+**/Properties/launchSettings.json
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+*.VC.db
+*.VC.VC.opendb
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# Visual Studio code coverage results
+*.coverage
+*.coveragexml
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignorable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.jfm
+*.pfx
+*.publishsettings
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+*.ndf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+node_modules/
+
+# Typescript v1 declaration files
+typings/
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio 6 auto-generated workspace file (contains which files were open etc.)
+*.vbw
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml
+
+# CodeRush
+.cr/
+
+# Python Tools for Visual Studio (PTVS)
+__pycache__/
+*.pyc
+
+# Cake - Uncomment if you are using it
+tools/**
+# !tools/packages.config
+
+# Telerik's JustMock configuration file
+*.jmconfig
+
+# BizTalk build output
+*.btp.cs
+*.btm.cs
+*.odx.cs
+*.xsd.cs

Demo.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Demo", "Demo\Demo.csproj", "{A2CC1506-A489-4C79-8EF3-FA9B786D1C91}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A2CC1506-A489-4C79-8EF3-FA9B786D1C91}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A2CC1506-A489-4C79-8EF3-FA9B786D1C91}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A2CC1506-A489-4C79-8EF3-FA9B786D1C91}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A2CC1506-A489-4C79-8EF3-FA9B786D1C91}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Demo/.gitignore

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+.idea/
+.vscode/
+.vs/
+
+bin/
+obj/
+
+*.user

Demo/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="using:Demo"
+             x:Class="Demo.App">
+  <Application.DataTemplates>
+    <local:ViewLocator />
+  </Application.DataTemplates>
+  <Application.Styles>
+    <FluentTheme Mode="Light" />
+  </Application.Styles>
+</Application>

Demo/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Demo.ViewModels;
+using Demo.Views;
+
+namespace Demo
+{
+    public class App : Application
+    {
+        public override void Initialize()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        public override void OnFrameworkInitializationCompleted()
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            {
+                desktop.MainWindow = new MainWindow
+                {
+                    DataContext = new MainWindowViewModel(),
+                };
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+    }
+}

Demo/Demo.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  <ItemGroup>
+    <Folder Include="Models\"/>
+    <AvaloniaResource Include="Assets\**"/>
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="0.10.6"/>
+    <PackageReference Include="Avalonia.Desktop" Version="0.10.6"/>
+    <PackageReference Include="Avalonia.Diagnostics" Version="0.10.6"/>
+    <PackageReference Include="Avalonia.ReactiveUI" Version="0.10.6"/>
+  </ItemGroup>
+</Project>

Demo/Program.cs

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+using System;
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.ReactiveUI;
+
+namespace Demo
+{
+    class Program
+    {
+        // Initialization code. Don't use any Avalonia, third-party APIs or any
+        // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+        // yet and stuff might break.
+        public static void Main(string[] args) => BuildAvaloniaApp()
+            .StartWithClassicDesktopLifetime(args);
+
+        // Avalonia configuration, don't remove; also used by visual designer.
+        public static AppBuilder BuildAvaloniaApp()
+            => AppBuilder.Configure<App>()
+                .UsePlatformDetect()
+                .LogToTrace()
+                .UseReactiveUI();
+    }
+}

Demo/ViewLocator.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using Demo.ViewModels;
+
+namespace Demo
+{
+    public class ViewLocator : IDataTemplate
+    {
+        public bool SupportsRecycling => false;
+
+        public IControl Build(object data)
+        {
+            var name = data.GetType().FullName!.Replace("ViewModel", "View");
+            var type = Type.GetType(name);
+
+            if (type != null)
+            {
+                return (Control)Activator.CreateInstance(type)!;
+            }
+            else
+            {
+                return new TextBlock { Text = "Not Found: " + name };
+            }
+        }
+
+        public bool Match(object data)
+        {
+            return data is ViewModelBase;
+        }
+    }
+}

Demo/ViewModels/ItemViewModel.cs

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+using ReactiveUI;
+
+namespace Demo.ViewModels
+{
+    public class ItemViewModel : ViewModelBase
+    {
+        private string _column1;
+        private string _column2;
+        private string _column3;
+
+        public string Column1
+        {
+            get => _column1;
+            set => this.RaiseAndSetIfChanged(ref _column1, value);
+        }
+
+        public string Column2
+        {
+            get => _column2;
+            set => this.RaiseAndSetIfChanged(ref _column2, value);
+        }
+
+        public string Column3
+        {
+            get => _column3;
+            set => this.RaiseAndSetIfChanged(ref _column3, value);
+        }
+    }
+}

Demo/ViewModels/MainWindowViewModel.cs

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+using System.Collections.ObjectModel;
+using ReactiveUI;
+
+namespace Demo.ViewModels
+{
+
+    public class MainWindowViewModel : ViewModelBase
+    {
+        private ObservableCollection<ItemViewModel> _items;
+
+        public ObservableCollection<ItemViewModel> Items
+        {
+            get => _items;
+            set => this.RaiseAndSetIfChanged(ref _items, value);
+        }
+
+        public MainWindowViewModel()
+        {
+            _items = new ObservableCollection<ItemViewModel>()
+            {
+                // new ItemViewModel()
+                // {
+                //     Column1 = "Test 1-1",
+                //     Column2 = "Test 1-2",
+                //     Column3 = "Test 1-3"
+                // },
+                // new ItemViewModel()
+                // {
+                //     Column1 = "Test 2-1",
+                //     Column2 = "Test 2-2",
+                //     Column3 = "Test 2-3"
+                // },
+                // new ItemViewModel()
+                // {
+                //     Column1 = "Test 3-1",
+                //     Column2 = "Test 3-2",
+                //     Column3 = "Test 3-3"
+                // },
+            };
+
+            for (var i = 0; i < 100_000; i++)
+            {
+                var item = new ItemViewModel()
+                {
+                    Column1 = $"Test {i}-1",
+                    Column2 = $"Test {i}-2",
+                    Column3 = $"Test {i}-3"
+                };
+
+                _items.Add(item);
+            }
+        }
+    }
+}

Demo/ViewModels/ViewModelBase.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using ReactiveUI;
+
+namespace Demo.ViewModels
+{
+    public class ViewModelBase : ReactiveObject
+    {
+    }
+}

Demo/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:Demo.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480"
+        x:Class="Demo.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel" x:CompileBindings="True"
+        MinWidth="640" MinHeight="480"
+        WindowStartupLocation="CenterScreen"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="Demo">
+  <Design.DataContext>
+    <vm:MainWindowViewModel />
+  </Design.DataContext>
+  <DockPanel>
+    <Grid DockPanel.Dock="Top" ColumnDefinitions="150,1,*,1,200">
+      <Panel Grid.Column="0" Margin="6" Background="Transparent">
+        <TextBlock Text="Column1" />
+      </Panel>
+      <Separator Grid.Column="1" DockPanel.Dock="Top" Background="Gray" Width="1"/>
+      <Panel Grid.Column="2" Margin="6" Background="Transparent">
+        <TextBlock Text="Column2" />
+      </Panel>
+      <Separator Grid.Column="3" DockPanel.Dock="Top" Background="Gray" Width="1"/>
+      <Panel Grid.Column="4" Margin="6" Background="Transparent">
+        <TextBlock Text="Column3" />
+      </Panel>
+    </Grid>
+    <Separator DockPanel.Dock="Top" Background="Gray" Height="1"/>
+    <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
+      <ItemsRepeater Items="{Binding Items}">
+        <ItemsRepeater.Layout>
+          <StackLayout Orientation="Vertical"/>
+        </ItemsRepeater.Layout>
+        <ItemsRepeater.ItemTemplate>
+          <DataTemplate DataType="vm:ItemViewModel">
+            <Grid ColumnDefinitions="150,1,*,1,200">
+              <Grid.Styles>
+                <Style Selector="Grid">
+                  <Setter Property="Background" Value="Transparent"/>
+                </Style>
+                <Style Selector="Grid:pointerover">
+                  <Setter Property="Background" Value="LightGray"/>
+                </Style>
+              </Grid.Styles>
+              <Panel Grid.Column="0" Margin="6" Background="Transparent">
+                <TextBlock Text="{Binding Column1}" />
+              </Panel>
+              <Separator Grid.Column="1" DockPanel.Dock="Top" Background="Gray" Width="1"/>
+              <Panel Grid.Column="2" Margin="6" Background="Transparent">
+                <TextBlock Text="{Binding Column2}" />
+              </Panel>
+              <Separator Grid.Column="3" DockPanel.Dock="Top" Background="Gray" Width="1"/>
+              <Panel Grid.Column="4" Margin="6" Background="Transparent">
+                <TextBlock Text="{Binding Column3}" />
+              </Panel>
+            </Grid>
+          </DataTemplate>
+        </ItemsRepeater.ItemTemplate>
+      </ItemsRepeater>
+    </ScrollViewer>
+  </DockPanel>
+</Window>

Demo/Views/MainWindow.axaml.cs

@@ -0,0 +1,22 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Demo.Views
+{
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+#if DEBUG
+            this.AttachDevTools();
+#endif
+        }
+
+        private void InitializeComponent()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+    }
+}

nuget.config

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+    <add key="AvaloniaCI" value="https://nuget.avaloniaui.net/repository/avalonia-all/index.json" />
+  </packageSources>
+</configuration>