Добавлен проект UI

Lattice.UI/Controls/LatticePane.cs

@@ -0,0 +1,83 @@
+using Lattice.Core.Models;
+using Lattice.UI.DragDrop;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Lattice.UI.Controls;
+
+/// <summary>
+/// Представляет визуальный контейнер для содержимого (панели или документа) в системе Lattice.
+/// </summary>
+[TemplatePart(Name = "HeaderPresenter", Type = typeof(FrameworkElement))]
+[TemplatePart(Name = "ContentPresenter", Type = typeof(ContentPresenter))]
+[TemplatePart(Name = "PART_CloseButton", Type = typeof(Button))] // Добавлено для ясности
+public class LatticePane : ContentControl
+{
+    public static readonly DependencyProperty TitleProperty =
+        DependencyProperty.Register(nameof(Title), typeof(string), typeof(LatticePane), new PropertyMetadata(string.Empty));
+
+    public static readonly DependencyProperty HeaderContentProperty =
+        DependencyProperty.Register(nameof(HeaderContent), typeof(object), typeof(LatticePane), new PropertyMetadata(null));
+
+    /// <summary>
+    /// Событие, возникающее при нажатии на кнопку закрытия в шаблоне.
+    /// </summary>
+    public event RoutedEventHandler? CloseClick;
+
+    public string Title
+    {
+        get => (string)GetValue(TitleProperty);
+        set => SetValue(TitleProperty, value);
+    }
+
+    public object HeaderContent
+    {
+        get => GetValue(HeaderContentProperty);
+        set => SetValue(HeaderContentProperty, value);
+    }
+
+    public LatticePane()
+    {
+        this.DefaultStyleKey = typeof(LatticePane);
+    }
+
+    protected override void OnApplyTemplate()
+    {
+        base.OnApplyTemplate();
+
+        // Логика кнопки закрытия
+        if (GetTemplateChild("PART_CloseButton") is Button closeButton)
+        {
+            closeButton.Click -= OnCloseButtonClick; // Защита от двойной подписки
+            closeButton.Click += OnCloseButtonClick;
+        }
+
+        // Логика перетаскивания (Drag-and-Drop)
+        if (GetTemplateChild("HeaderPresenter") is FrameworkElement header)
+        {
+            this.Loaded += (s, e) =>
+            {
+                var host = FindParentHost(this);
+                if (host != null && this.DataContext is LayoutNode node)
+                {
+                    var handler = new DockTabHandler(host);
+                    handler.Attach(header, node);
+                }
+            };
+        }
+    }
+
+    private void OnCloseButtonClick(object sender, RoutedEventArgs e)
+    {
+        CloseClick?.Invoke(this, e);
+    }
+
+    private LatticeDockHost? FindParentHost(DependencyObject child)
+    {
+        var parent = Microsoft.UI.Xaml.Media.VisualTreeHelper.GetParent(child);
+        if (parent == null) return null;
+
+        if (parent is LatticeDockHost host) return host;
+        return FindParentHost(parent);
+    }
+}