Initial commit

ColorPicker.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33424.131
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ColorPicker", "ColorPicker\ColorPicker.csproj", "{566A4622-115B-4551-A4DF-FACAAA9926CB}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{566A4622-115B-4551-A4DF-FACAAA9926CB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{566A4622-115B-4551-A4DF-FACAAA9926CB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{566A4622-115B-4551-A4DF-FACAAA9926CB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{566A4622-115B-4551-A4DF-FACAAA9926CB}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AFB26A20-AF6C-48B5-A073-4AEE2F70CA2F}
+	EndGlobalSection
+EndGlobal

ColorPicker/App.xaml

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+<Application x:Class="ColorPicker.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:ColorPicker"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

ColorPicker/App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace ColorPicker
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

ColorPicker/AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

ColorPicker/ColorPicker.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.1.0" />
+  </ItemGroup>
+
+</Project>

ColorPicker/ColorPicker.csproj.user

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+  <ItemGroup>
+    <ApplicationDefinition Update="App.xaml">
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+  </ItemGroup>
+  <ItemGroup>
+    <Page Update="MainWindow.xaml">
+      <SubType>Designer</SubType>
+    </Page>
+  </ItemGroup>
+</Project>

ColorPicker/ColorPickerViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.RightsManagement;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using System.Diagnostics;
+
+namespace ColorPicker.ViewModel
+{
+    public partial class ColorPickerViewModel : ObservableObject
+    {
+        public ColorPickerViewModel()
+        {
+            red = 255;
+            green = 0;
+            blue = 0;
+            CalculateHex();
+        }
+
+        [ObservableProperty]
+        byte red;
+
+        [ObservableProperty]
+        byte green;
+
+        [ObservableProperty]
+        byte blue;
+
+        [ObservableProperty]
+        string hex;
+
+        [ObservableProperty]
+        string hexInput;
+
+        bool lockEvents = false;
+
+        partial void OnRedChanged(byte value)
+        {
+            if (lockEvents) return;
+            CalculateHex();
+        }
+
+        partial void OnGreenChanged(byte value)
+        {
+            if (lockEvents) return;
+            CalculateHex();
+        }
+
+        partial void OnBlueChanged(byte value)
+        {
+            if (lockEvents) return;
+            CalculateHex();
+        }
+
+        partial void OnHexInputChanged(string value)
+        {
+            if (lockEvents || !Regex.IsMatch(value, @"^#[\dA-F]{6}$", RegexOptions.IgnoreCase))
+                return;
+
+            Hex = HexInput;
+            CalculateRGB();
+        }
+
+        public void CalculateHex()
+        {
+            Hex = "#" + Red.ToString("X2") + Green.ToString("X2") + Blue.ToString("X2");
+            HexInput = Hex;
+        }
+
+        public void CalculateRGB()
+        {
+            lockEvents = true;
+            Red = byte.Parse(Hex.Substring(1, 2), System.Globalization.NumberStyles.HexNumber);
+            Green = byte.Parse(Hex.Substring(3, 2), System.Globalization.NumberStyles.HexNumber);
+            Blue = byte.Parse(Hex.Substring(5, 2), System.Globalization.NumberStyles.HexNumber);
+            lockEvents = false;
+        }
+    }
+}

ColorPicker/MainWindow.xaml

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+<Window x:Class="ColorPicker.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        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"
+        xmlns:local="clr-namespace:ColorPicker"
+        xmlns:vm="clr-namespace:ColorPicker.ViewModel"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Window.Resources>
+        <vm:ColorPickerViewModel x:Key="viewModel" />
+    </Window.Resources>
+
+    <Grid DataContext="{StaticResource viewModel}">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="*" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="*" />
+        </Grid.ColumnDefinitions>
+        <Rectangle Grid.Row="0" Grid.Column="0" Fill="{Binding Hex}" Stroke="Black" StrokeThickness="5" RadiusX="5" RadiusY="5" Margin="10,10,10,5" />
+        <Label Grid.Row="1" Grid.Column="0" Content="{Binding Red}" ContentStringFormat="Red: {0}" Margin="10,5,10,5" />
+        <Slider Grid.Row="2" Grid.Column="0" Maximum="255" Value="{Binding Red}" Margin="10,5,10,5" />
+        <Label Grid.Row="3" Grid.Column="0" Content="{Binding Green}" ContentStringFormat="Green: {0}" Margin="10,5,10,5" />
+        <Slider Grid.Row="4" Grid.Column="0" Maximum="255" Value="{Binding Green}" Margin="10,5,10,5" />
+        <Label Grid.Row="5" Grid.Column="0" Content="{Binding Blue}" ContentStringFormat="Blue: {0}" Margin="10,5,10,5" />
+        <Slider Grid.Row="6" Grid.Column="0" Maximum="255" Value="{Binding Blue}" Margin="10,5,10,5" />
+        <TextBox Grid.Row="7" Grid.Column="0" Text="{Binding Path=HexInput, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Margin="10,10,10,10" Padding="3" />
+    </Grid>
+</Window>

ColorPicker/MainWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace ColorPicker
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}