优化更新代码，添加界面功能并整合

WPFluent/Controls/Flyout/Flyout.cs

@@ -0,0 +1,138 @@
+
+
+
+using System.Windows.Controls.Primitives;
+
+
+// ReSharper disable once CheckNamespace
+namespace WPFluent.Controls;
+
+/// <summary>
+/// Represents a control that creates a pop-up window that displays information for an element in the interface.
+/// </summary>
+[TemplatePart(Name = "PART_Popup", Type = typeof(Popup))]
+public class Flyout : System.Windows.Controls.ContentControl
+{
+    private const string ElementPopup = "PART_Popup";
+
+    /// <summary>
+    /// Identifies the <see cref="Closed"/> routed event.
+    /// </summary>
+    public static readonly RoutedEvent ClosedEvent = EventManager.RegisterRoutedEvent(
+        nameof(Closed),
+        RoutingStrategy.Bubble,
+        typeof(TypedEventHandler<Flyout, RoutedEventArgs>),
+        typeof(Flyout));
+
+    /// <summary>
+    /// Identifies the <see cref="IsOpen"/> dependency property.
+    /// </summary>
+    public static readonly DependencyProperty IsOpenProperty = DependencyProperty.Register(
+        nameof(IsOpen),
+        typeof(bool),
+        typeof(Flyout),
+        new PropertyMetadata(false));
+
+    /// <summary>
+    /// Identifies the <see cref="Opened"/> routed event.
+    /// </summary>
+    public static readonly RoutedEvent OpenedEvent = EventManager.RegisterRoutedEvent(
+        nameof(Opened),
+        RoutingStrategy.Bubble,
+        typeof(TypedEventHandler<Flyout, RoutedEventArgs>),
+        typeof(Flyout));
+
+    /// <summary>
+    /// Identifies the <see cref="Placement"/> dependency property.
+    /// </summary>
+    public static readonly DependencyProperty PlacementProperty = DependencyProperty.Register(
+        nameof(Placement),
+        typeof(PlacementMode),
+        typeof(Flyout),
+        new PropertyMetadata(PlacementMode.Top));
+
+    private Popup _popup = default;
+
+    /// <summary>
+    /// Event triggered when <see cref="Flyout"/> is opened.
+    /// </summary>
+    public event TypedEventHandler<Flyout, RoutedEventArgs> Closed
+    {
+        add => AddHandler(ClosedEvent, value);
+        remove => RemoveHandler(ClosedEvent, value);
+    }
+
+    /// <summary>
+    /// Event triggered when <see cref="Flyout"/> is opened.
+    /// </summary>
+    public event TypedEventHandler<Flyout, RoutedEventArgs> Opened
+    {
+        add => AddHandler(OpenedEvent, value);
+        remove => RemoveHandler(OpenedEvent, value);
+    }
+
+    protected virtual void OnPopupClosed(object sender, EventArgs e)
+    {
+        Hide();
+        RaiseEvent(new RoutedEventArgs(ClosedEvent, this));
+    }
+
+    protected virtual void OnPopupOpened(object sender, EventArgs e)
+    { RaiseEvent(new RoutedEventArgs(OpenedEvent, this)); }
+
+    public void Hide()
+    {
+        if(IsOpen)
+        {
+            SetCurrentValue(IsOpenProperty, false);
+        }
+    }
+
+    /// <summary>
+    /// Invoked whenever application code or an internal process, such as a rebuilding layout pass, calls the
+    /// ApplyTemplate method.
+    /// </summary>
+    public override void OnApplyTemplate()
+    {
+        base.OnApplyTemplate();
+
+        _popup = GetTemplateChild(ElementPopup) as Popup;
+
+        if(_popup is null)
+        {
+            return;
+        }
+
+        _popup.Opened -= OnPopupOpened;
+        _popup.Opened += OnPopupOpened;
+
+        _popup.Closed -= OnPopupClosed;
+        _popup.Closed += OnPopupClosed;
+    }
+
+    public void Show()
+    {
+        if(!IsOpen)
+        {
+            SetCurrentValue(IsOpenProperty, true);
+        }
+    }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether a <see cref="Flyout"/> is visible.
+    /// </summary>
+    public bool IsOpen { get => (bool)GetValue(IsOpenProperty); set => SetValue(IsOpenProperty, value); }
+
+    /// <summary>
+    /// Gets or sets the orientation of the <see cref="Flyout"/> control when the control opens, and specifies the
+    /// behavior of the <see cref="T:System.Windows.Controls.Primitives.Popup"/> control when it overlaps screen
+    /// boundaries.
+    /// </summary>
+    [Bindable(true)]
+    [Category("Layout")]
+    public PlacementMode Placement
+    {
+        get => (PlacementMode)GetValue(PlacementProperty);
+        set => SetValue(PlacementProperty, value);
+    }
+}