功能完善

NeuWPF/NeoUI/Controls/Spin.xaml.cs

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+namespace NeumUI.Controls;
+
+using System.Windows;
+
+using ContentControlBase = System.Windows.Controls.ContentControl;
+
+/// <summary>
+/// A spinner for displaying loading state of a page or a section.
+/// </summary>
+[TemplateVisualState(Name = "Spun", GroupName = "SpinStates")]
+[TemplateVisualState(Name = "Unspun", GroupName = "SpinStates")]
+public class Spin : ContentControlBase
+{
+    #region Properties
+    public static readonly DependencyProperty IndicatorProperty =
+        DependencyProperty.Register(
+        nameof(Indicator),
+        typeof(UIElement),
+        typeof(Spin),
+        new PropertyMetadata(null, OnSpinningChanged));
+
+    /// <summary>
+    /// Gets/sets element of the spinning indicator.
+    /// </summary>
+    public UIElement Indicator
+    {
+        get => (UIElement)GetValue(IndicatorProperty);
+        set => SetValue(IndicatorProperty, value);
+    }
+
+    public static readonly DependencyProperty SpinningProperty =
+        DependencyProperty.Register(
+        nameof(Spinning),
+        typeof(bool),
+        typeof(Spin),
+        new PropertyMetadata(true, OnSpinningChanged));
+
+    /// <summary>
+    /// Gets/sets whether spin is spinning.
+    /// </summary>
+    public bool Spinning { get => (bool)GetValue(SpinningProperty);
+        set => SetValue(SpinningProperty, value);
+    }
+
+    private static void OnSpinningChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+    { (d as Spin).GoToSpinState(); }
+
+    private void GoToSpinState()
+    { VisualStateManager.GoToState(this, Spinning && null == Indicator ? "Spun" : "Unspun", true); }
+
+    public static readonly DependencyProperty TipProperty =
+        DependencyProperty.Register(nameof(Tip), typeof(string), typeof(Spin), new PropertyMetadata(string.Empty));
+
+    /// <summary>
+    /// Gets/sets customize description content when spin has children.
+    /// </summary>
+    public string Tip { get => (string)GetValue(TipProperty);
+        set => SetValue(TipProperty, value);
+    }
+    #endregion
+
+    #region Constructors
+    static Spin()
+    { DefaultStyleKeyProperty.OverrideMetadata(typeof(Spin), new FrameworkPropertyMetadata(typeof(Spin))); }
+    #endregion
+
+    #region Overrides
+    public override void OnApplyTemplate()
+    {
+        base.OnApplyTemplate();
+        GoToSpinState();
+    }
+    #endregion
+}