initial commit

.gitignore

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+bin/
+obj/
+.idea/
+.vs/
+tmp/
+temp/
+packages/
+*.user

TicTacToe.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TicTacToe", "TicTacToe\TicTacToe.csproj", "{05A4D578-6136-42EC-B279-26B2D970325E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{05A4D578-6136-42EC-B279-26B2D970325E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{05A4D578-6136-42EC-B279-26B2D970325E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{05A4D578-6136-42EC-B279-26B2D970325E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{05A4D578-6136-42EC-B279-26B2D970325E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

TicTacToe/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="TicTacToe.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.Styles>
+        <SimpleTheme />
+    </Application.Styles>
+</Application>

TicTacToe/App.axaml.cs

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

TicTacToe/Cell.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="TicTacToe.Cell"
+             BorderThickness="2"
+             BorderBrush="White">
+    <TextBlock TextAlignment="Center" VerticalAlignment="Center" HorizontalAlignment="Center" FontSize="40">X</TextBlock>
+</UserControl>

TicTacToe/Cell.axaml.cs

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+using Avalonia.Controls;
+
+namespace TicTacToe;
+
+public partial class Cell : UserControl
+{
+    public Cell()
+    {
+        InitializeComponent();
+    }
+}

TicTacToe/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="TicTacToe.MainWindow"
+        Title="TicTacToe"
+        FontSize="20">
+    <Grid>
+        <Grid.RowDefinitions>40 *</Grid.RowDefinitions>
+        <StackPanel Orientation="Horizontal" Spacing="20">
+            <Label Target="SizeTextBox" VerticalContentAlignment="Center">Size:</Label>
+            <TextBox Name="SizeTextBox"></TextBox>
+            <Button Click="RestartButton_OnClick">Restart</Button>
+        </StackPanel>
+        <Grid Grid.Row="1" Name="GameGrid"></Grid>
+    </Grid>
+</Window>

TicTacToe/MainWindow.axaml.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace TicTacToe;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+
+
+    private void RestartButton_OnClick(object? sender, RoutedEventArgs e)
+    {
+        int size = Convert.ToInt32(SizeTextBox.Text);
+        GameGrid.Children.Clear();
+        GameGrid.RowDefinitions = new RowDefinitions();
+        for(int y=0; y<size; y++)
+            GameGrid.RowDefinitions.Add(new RowDefinition());
+        GameGrid.ColumnDefinitions = new ColumnDefinitions();
+        for(int x=0; x<size; x++)
+            GameGrid.ColumnDefinitions.Add(new ColumnDefinition());
+        for(int y=0; y<size; y++)
+            for (int x = 0; x < size; x++)
+            {
+                var c = new Cell();
+                c.SetValue(Grid.ColumnProperty, x);
+                c.SetValue(Grid.RowProperty, y);
+                GameGrid.Children.Add(c);
+                
+            }
+    }
+}

TicTacToe/Program.cs

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+using Avalonia;
+using System;
+
+namespace TicTacToe;
+
+class Program
+{
+    [STAThread]
+    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();
+}

TicTacToe/TicTacToe.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>disable</ImplicitUsings>
+        <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+        <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+    </PropertyGroup>
+
+
+    <ItemGroup>
+        <PackageReference Include="Avalonia" Version="11.0.5"/>
+        <PackageReference Include="Avalonia.Desktop" Version="11.0.5"/>
+        <PackageReference Include="Avalonia.Themes.Simple" Version="11.0.5"/>
+        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.5"/>
+    </ItemGroup>
+</Project>

nuget.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <packageSources>
+        <add key="local" value="./packages/" />
+    </packageSources>
+</configuration>