DragAndDrop core

Lattice.IDE/App.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<Application
+    x:Class="Lattice.IDE.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:lt="using:Lattice.Themes"
+    xmlns:local="using:Lattice.IDE">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
+                <ResourceDictionary Source="ms-appx:///Lattice.UI.Docking.WinUI/Themes/Generic.xaml" />
+
+                <!-- Other merged dictionaries here -->
+            </ResourceDictionary.MergedDictionaries>
+            <!-- Other app resources here -->
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

Lattice.IDE/App.xaml.cs

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+using Lattice.Themes;
+using Microsoft.UI.Xaml;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace Lattice.IDE
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public partial class App : Application
+    {
+        private Window? _window;
+
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            InitializeComponent();
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched.
+        /// </summary>
+        /// <param name="args">Details about the launch request and process.</param>
+        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        {
+            ThemeManager.Current.ApplyTheme(new FluentThemePack());
+
+            _window = new MainWindow();
+            _window.Activate();
+        }
+    }
+}

Lattice.IDE/Controls/EditorView.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<UserControl
+    x:Class="Lattice.IDE.Controls.EditorView"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:Lattice.IDE.Controls"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <Grid Background="{ThemeResource Lattice.Brush.Background.Secondary}">
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="Auto"/>
+            <!-- Полоса номеров строк -->
+            <ColumnDefinition Width="*"/>
+            <!-- Текст кода -->
+        </Grid.ColumnDefinitions>
+
+        <!-- Левая панель с номерами строк -->
+        <StackPanel Grid.Column="0" Background="{ThemeResource Lattice.Brush.Background.Primary}" Padding="10,5">
+            <TextBlock Text="1" Foreground="Gray" FontFamily="Cascadia Code, Consolas"/>
+            <TextBlock Text="2" Foreground="Gray" FontFamily="Cascadia Code, Consolas"/>
+            <TextBlock Text="3" Foreground="Gray" FontFamily="Cascadia Code, Consolas"/>
+            <TextBlock Text="4" Foreground="Gray" FontFamily="Cascadia Code, Consolas"/>
+            <TextBlock Text="5" Foreground="Gray" FontFamily="Cascadia Code, Consolas"/>
+            <TextBlock Text="6" Foreground="Gray" FontFamily="Cascadia Code, Consolas"/>
+        </StackPanel>
+
+        <!-- Основная область редактирования -->
+        <TextBox Grid.Column="1" 
+                 AcceptsReturn="True"
+                 IsSpellCheckEnabled="False"
+                 TextWrapping="NoWrap"
+                 FontFamily="Cascadia Code, Consolas"
+                 FontSize="14"
+                 BorderThickness="0"
+                 Padding="10"
+                 Background="Transparent"
+                 Foreground="{ThemeResource TextFillColorPrimaryBrush}"
+                 ScrollViewer.HorizontalScrollBarVisibility="Auto"
+                 ScrollViewer.VerticalScrollBarVisibility="Auto"
+                 xml:space="preserve">
+            <TextBox.Text>using System;
+using Lattice.Core;
+
+namespace Lattice.IDE.Demo;
+
+public class Program 
+{
+    public void Main() 
+    {
+        Console.WriteLine("Hello, Lattice 2026!");
+    }
+}
+            </TextBox.Text>
+        </TextBox>
+    </Grid>
+</UserControl>

Lattice.IDE/Controls/EditorView.xaml.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace Lattice.IDE.Controls
+{
+    public sealed partial class EditorView : UserControl
+    {
+        public EditorView()
+        {
+            InitializeComponent();
+        }
+    }
+}

Lattice.IDE/Controls/SolutionExplorerView.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<UserControl
+    x:Class="Lattice.IDE.Controls.SolutionExplorerView"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:Lattice.IDE.Controls"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <Grid Background="{ThemeResource LayerFillColorDefaultBrush}" Padding="10">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+
+        <TextBlock Grid.Row="0" 
+                   Text="SOLUTION 'LATTICE' (2026)" 
+                   FontSize="11" 
+                   FontWeight="Bold" 
+                   Opacity="0.6"/>
+
+        <TreeView Grid.Row="1" Margin="0,10,0,0">
+            <TreeView.RootNodes>
+                <TreeViewNode Content="Lattice.Core.Docking" IsExpanded="True">
+                    <TreeViewNode.Children>
+                        <TreeViewNode Content="Models" />
+                        <TreeViewNode Content="Engine" />
+                    </TreeViewNode.Children>
+                </TreeViewNode>
+                <TreeViewNode Content="Lattice.UI.Docking.WinUI" IsExpanded="True">
+                    <TreeViewNode.Children>
+                        <TreeViewNode Content="Controls" />
+                        <TreeViewNode Content="Themes" />
+                    </TreeViewNode.Children>
+                </TreeViewNode>
+            </TreeView.RootNodes>
+        </TreeView>
+    </Grid>
+</UserControl>

Lattice.IDE/Controls/SolutionExplorerView.xaml.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
+using Microsoft.UI.Xaml.Data;
+using Microsoft.UI.Xaml.Input;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices.WindowsRuntime;
+using Windows.Foundation;
+using Windows.Foundation.Collections;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace Lattice.IDE.Controls
+{
+    public sealed partial class SolutionExplorerView : UserControl
+    {
+        public SolutionExplorerView()
+        {
+            InitializeComponent();
+        }
+    }
+}

Lattice.IDE/Lattice.IDE.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFrameworks>net8.0-windows10.0.19041.0;net9.0-windows10.0.19041.0;net10.0-windows10.0.19041.0</TargetFrameworks>
+    <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
+    <RootNamespace>Lattice.IDE</RootNamespace>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <Platforms>x86;x64;ARM64</Platforms>
+    <RuntimeIdentifiers>win-x86;win-x64;win-arm64</RuntimeIdentifiers>
+    <PublishProfile>win-$(Platform).pubxml</PublishProfile>
+    <UseWinUI>true</UseWinUI>
+    <WinUISDKReferences>false</WinUISDKReferences>
+    <EnableMsixTooling>true</EnableMsixTooling>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  <ItemGroup>
+    <None Remove="Controls\EditorView.xaml" />
+    <None Remove="Controls\SolutionExplorerView.xaml" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Include="Assets\SplashScreen.scale-200.png" />
+    <Content Include="Assets\LockScreenLogo.scale-200.png" />
+    <Content Include="Assets\Square150x150Logo.scale-200.png" />
+    <Content Include="Assets\Square44x44Logo.scale-200.png" />
+    <Content Include="Assets\Square44x44Logo.targetsize-24_altform-unplated.png" />
+    <Content Include="Assets\StoreLogo.png" />
+    <Content Include="Assets\Wide310x150Logo.scale-200.png" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Manifest Include="$(ApplicationManifest)" />
+  </ItemGroup>
+
+  <!--
+    Defining the "Msix" ProjectCapability here allows the Single-project MSIX Packaging
+    Tools extension to be activated for this project even if the Windows App SDK Nuget
+    package has not yet been restored.
+  -->
+  <ItemGroup Condition="'$(DisableMsixProjectCapabilityAddedByProject)'!='true' and '$(EnableMsixTooling)'=='true'">
+    <ProjectCapability Include="Msix" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.26100.7463" />
+    <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.8.251106002" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Lattice.Core.Docking\Lattice.Core.Docking.csproj" />
+    <ProjectReference Include="..\Lattice.Themes.Core\Lattice.Themes.Core.csproj" />
+    <ProjectReference Include="..\Lattice.Themes.Fluent\Lattice.Themes.Fluent.csproj" />
+    <ProjectReference Include="..\Lattice.Themes.VS2026\Lattice.Themes.VS2026.csproj" />
+    <ProjectReference Include="..\Lattice.UI.Docking.WinUI\Lattice.UI.Docking.WinUI.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <Page Update="Controls\EditorView.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+  </ItemGroup>
+  <ItemGroup>
+    <Page Update="Controls\SolutionExplorerView.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+  </ItemGroup>
+
+  <!--
+    Defining the "HasPackageAndPublishMenuAddedByProject" property here allows the Solution
+    Explorer "Package and Publish" context menu entry to be enabled for this project even if
+    the Windows App SDK Nuget package has not yet been restored.
+  -->
+  <PropertyGroup Condition="'$(DisableHasPackageAndPublishMenuAddedByProject)'!='true' and '$(EnableMsixTooling)'=='true'">
+    <HasPackageAndPublishMenu>true</HasPackageAndPublishMenu>
+  </PropertyGroup>
+
+  <!-- Publish Properties -->
+  <PropertyGroup>
+    <PublishReadyToRun Condition="'$(Configuration)' == 'Debug'">False</PublishReadyToRun>
+    <PublishReadyToRun Condition="'$(Configuration)' != 'Debug'">True</PublishReadyToRun>
+    <PublishTrimmed Condition="'$(Configuration)' == 'Debug'">False</PublishTrimmed>
+    <PublishTrimmed Condition="'$(Configuration)' != 'Debug'">True</PublishTrimmed>
+  </PropertyGroup>
+</Project>

Lattice.IDE/Layout/DemoContent.cs

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+using Lattice.Core.Docking.Abstractions;
+
+namespace Lattice.IDE;
+
+/// <summary>
+/// Реализация контента для демонстрации, принимающая любой UI-объект.
+/// </summary>
+public class DemoContent : IDockContent
+{
+    public string Id { get; }
+    public string Title { get; set; }
+
+    /// <summary>
+    /// Сюда мы передаем наш UserControl (SolutionExplorerView и т.д.)
+    /// </summary>
+    public object View { get; set; }
+
+    public bool CanClose { get; set; } = true;
+
+    public DemoContent(string id, string title, object view)
+    {
+        Id = id;
+        Title = title;
+        View = view;
+    }
+
+    public bool OnClosing() => true;
+}

Lattice.IDE/MainWindow.xaml

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+<?xml version="1.0" encoding="utf-8"?>
+<Window
+    x:Class="Lattice.IDE.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:Lattice.IDE"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:lattice="using:Lattice.UI"
+    mc:Ignorable="d"
+    Title="Lattice.IDE">
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+
+        <!-- Меню управления Demo -->
+        <StackPanel Orientation="Horizontal" Spacing="10" Padding="10" Background="{ThemeResource SystemControlBackgroundChromeMediumLowBrush}">
+            <Button Content="Fluent UI Theme" Click="SetFluentTheme"/>
+            <Button Content="VS 2026 Theme" Click="SetVSTheme"/>
+            <TextBlock Text="Lattice IDE Demo 2026" VerticalAlignment="Center" Margin="20,0" FontWeight="Bold"/>
+        </StackPanel>
+
+        <!-- Lattice Docking Host -->
+        <lattice:LatticeDockHost x:Name="DockHost" Grid.Row="1" />
+    </Grid>
+</Window>

Lattice.IDE/MainWindow.xaml.cs

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+using Lattice.Core.Docking.Engine;
+using Lattice.Core.Docking.Models;
+using Lattice.IDE.Controls;
+using Lattice.Themes;
+using Microsoft.UI.Xaml;
+// Ïðåäïîëîæèì, ÷òî VS2026Theme òîæå ðåàëèçîâàí àíàëîãè÷íî Fluent
+// using Lattice.Themes.VisualStudio2026; 
+
+namespace Lattice.IDE;
+
+public sealed partial class MainWindow : Window
+{
+    private LayoutManager _manager;
+
+    public MainWindow()
+    {
+        this.InitializeComponent();
+        WindowTracker.Register(this);
+        SystemBackdrop = new Microsoft.UI.Xaml.Media.MicaBackdrop();
+        InitLattice();
+    }
+
+    private void InitLattice()
+    {
+        _manager = new LayoutManager();
+
+        // Ñîçäàåì êîíòåíò íà îñíîâå XAML UserControls
+        var solutionExplorer = new DemoContent(
+            "sln",
+            "Solution Explorer",
+            new SolutionExplorerView()
+        );
+
+        var editor = new DemoContent(
+            "code_01",
+            "Program.cs",
+            new EditorView()
+        );
+
+        // Ñîáèðàåì äåðåâî (êàê ðàíüøå)
+        var leftLeaf = new DockLeaf();
+        leftLeaf.AddContent(solutionExplorer);
+
+        var centerLeaf = new DockLeaf()
+        {
+            TabPlacement = TabPlacement.Top,
+        };
+        centerLeaf.AddContent(editor);
+
+        var rootGroup = new DockGroup(leftLeaf, centerLeaf, SplitDirection.Horizontal)
+        {
+            SplitRatio = 0.25
+        };
+
+        _manager.SetRoot(rootGroup);
+        DockHost.Manager = _manager;
+    }
+
+    private void SetFluentTheme(object sender, RoutedEventArgs e) =>
+        ThemeManager.Current.ApplyTheme(new FluentThemePack());
+
+    private void SetVSTheme(object sender, RoutedEventArgs e) =>
+        ThemeManager.Current.ApplyTheme(new VS2026ThemePack());
+}

Lattice.IDE/Package.appxmanifest

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+<?xml version="1.0" encoding="utf-8"?>
+
+<Package
+  xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
+  xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
+  xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
+  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
+  IgnorableNamespaces="uap rescap">
+
+  <Identity
+    Name="c6596033-98b6-4778-8280-bc9256b9be07"
+    Publisher="CN=frost"
+    Version="1.0.0.0" />
+
+  <mp:PhoneIdentity PhoneProductId="c6596033-98b6-4778-8280-bc9256b9be07" PhonePublisherId="00000000-0000-0000-0000-000000000000"/>
+
+  <Properties>
+    <DisplayName>Lattice.IDE</DisplayName>
+    <PublisherDisplayName>frost</PublisherDisplayName>
+    <Logo>Assets\StoreLogo.png</Logo>
+  </Properties>
+
+  <Dependencies>
+    <TargetDeviceFamily Name="Windows.Universal" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+    <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.17763.0" MaxVersionTested="10.0.19041.0" />
+  </Dependencies>
+
+  <Resources>
+    <Resource Language="x-generate"/>
+  </Resources>
+
+  <Applications>
+    <Application Id="App"
+      Executable="$targetnametoken$.exe"
+      EntryPoint="$targetentrypoint$">
+      <uap:VisualElements
+        DisplayName="Lattice.IDE"
+        Description="Lattice.IDE"
+        BackgroundColor="transparent"
+        Square150x150Logo="Assets\Square150x150Logo.png"
+        Square44x44Logo="Assets\Square44x44Logo.png">
+        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png" />
+        <uap:SplashScreen Image="Assets\SplashScreen.png" />
+      </uap:VisualElements>
+    </Application>
+  </Applications>
+
+  <Capabilities>
+    <rescap:Capability Name="runFullTrust" />
+  </Capabilities>
+</Package>

Lattice.IDE/Properties/launchSettings.json

@@ -0,0 +1,10 @@
+{
+  "profiles": {
+    "Lattice.IDE (Package)": {
+      "commandName": "MsixPackage"
+    },
+    "Lattice.IDE (Unpackaged)": {
+      "commandName": "Project"
+    }
+  }
+}

Lattice.IDE/app.manifest

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity version="1.0.0.0" name="Lattice.IDE.app"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- The ID below informs the system that this application is compatible with OS features first introduced in Windows 10. 
+      It is necessary to support features in unpackaged applications, for example the custom titlebar implementation.
+      For more info see https://docs.microsoft.com/windows/apps/windows-app-sdk/use-windows-app-sdk-run-time#declare-os-compatibility-in-your-application-manifest -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+  
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+    </windowsSettings>
+  </application>
+</assembly>