Init commit

Windows/ColorPickerWindow/ColorPickerView.xaml

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+<Window x:Class="StructureHelper.ColorPickerView"
+        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:StructureHelper"
+        mc:Ignorable="d"
+        d:DataContext="{d:DesignInstance local:ColorPickerViewModel}"
+        Title="Выбрать цвет" Height="200" Width="500" Topmost="True" ResizeMode="NoResize">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="80"/>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="80"/>
+            <ColumnDefinition Width="80"/>
+        </Grid.ColumnDefinitions>
+        <TextBlock VerticalAlignment="Center" HorizontalAlignment="Left" Margin="10" Text="Красный"/>
+        <Slider Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Stretch" Margin="10" Value="{Binding Red}" Minimum="0" Maximum="255"/>
+        <TextBox Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Stretch" Margin="10" Text="{Binding Red}"/>
+
+        <Border Grid.Column="3" Grid.RowSpan="3" Margin="10" BorderBrush="Black" BorderThickness="1">
+            <Rectangle Fill="{Binding SelectedColor}"/>
+        </Border>
+
+        <TextBlock Grid.Row="1" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="10" Text="Зеленый"/>
+        <Slider Grid.Row="1" Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Stretch" Margin="10" Value="{Binding Green}" Minimum="0" Maximum="255"/>
+        <TextBox Grid.Row="1" Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Stretch" Margin="10" Text="{Binding Green}"/>
+
+        <TextBlock Grid.Row="2" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="10" Text="Синий"/>
+        <Slider Grid.Row="2" Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Stretch" Margin="10" Value="{Binding Blue}" Minimum="0" Maximum="255"/>
+        <TextBox Grid.Row="2" Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Stretch" Margin="10" Text="{Binding Blue}"/>
+
+        <Button Grid.Row="3" Grid.Column="2" Grid.ColumnSpan="2" Margin="10" VerticalAlignment="Center" HorizontalAlignment="Right" Content="Выбрать цвет" Command="{Binding SetColor}"/>
+    </Grid>
+</Window>

Windows/ColorPickerWindow/ColorPickerView.xaml.cs

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+using System.Windows;
+
+namespace StructureHelper
+{
+    /// <summary>
+    /// Логика взаимодействия для ColorPickerView.xaml
+    /// </summary>
+    public partial class ColorPickerView : Window
+    {
+        public ColorPickerView(PrimitiveDefinition primitive)
+        {
+            var viewModel = new ColorPickerViewModel(primitive);
+            DataContext = viewModel;
+            InitializeComponent();
+        }
+    }
+}

Windows/ColorPickerWindow/ColorPickerViewModel.cs

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+using System;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+using System.Windows.Media;
+using StructureHelper.Infrastructure;
+
+namespace StructureHelper
+{
+    public class ColorPickerViewModel : ViewModelBase
+    {
+        private int red, green, blue;
+
+        public int Red
+        {
+            get => red;
+            set => OnColorItemChanged(value, ref red);
+        }
+        public int Green
+        {
+            get => green;
+            set => OnColorItemChanged(value, ref green);
+        }
+        public int Blue
+        {
+            get => blue;
+            set => OnColorItemChanged(value, ref blue);
+        }
+
+        private SolidColorBrush selectedColor;
+        public SolidColorBrush SelectedColor
+        {
+            get => selectedColor;
+            set => OnPropertyChanged(value, selectedColor);
+        }
+        public ICommand SetColor { get; }
+        public ColorPickerViewModel(PrimitiveDefinitionBase primitive)
+        {
+            if (primitive != null)
+            {
+                var solidBrush = primitive.Brush;
+                Red = solidBrush.Color.R;
+                Green = solidBrush.Color.G;
+                Blue = solidBrush.Color.B;
+
+                SetColor = new RelayCommand(o => primitive.Brush = SelectedColor);
+            }
+        }
+        private void OnColorItemChanged(int value, ref int colorItem, [CallerMemberName] string propertyName = null)
+        {
+            if (value >= 0 && value <= 255 && Math.Abs(colorItem - value) > 0.001)
+            {
+                colorItem = value;
+                OnPropertyChanged(propertyName);
+                UpdateSelectedColor();
+            }
+        }
+        private void UpdateSelectedColor()
+        {
+            var color = Color.FromRgb((byte)Red, (byte)Green, (byte)Blue);
+            SelectedColor = new SolidColorBrush(color);
+            OnPropertyChanged(nameof(SelectedColor));
+        }
+    }
+}