OnlineMonitorSystem/HandyControl/HandyControl_Shared/Controls/Attach/TipElement.cs

using System.Windows;
using HandyControl.Data;

namespace HandyControl.Controls;

public class TipElement
{
    public static readonly DependencyProperty VisibilityProperty = DependencyProperty.RegisterAttached(
        "Visibility", typeof(Visibility), typeof(TipElement), new PropertyMetadata(Visibility.Collapsed));

    public static void SetVisibility(DependencyObject element, Visibility value) => element.SetValue(VisibilityProperty, value);

    public static Visibility GetVisibility(DependencyObject element) => (Visibility) element.GetValue(VisibilityProperty);

    public static readonly DependencyProperty PlacementProperty = DependencyProperty.RegisterAttached(
        "Placement", typeof(PlacementType), typeof(TipElement), new PropertyMetadata(default(PlacementType)));

    public static void SetPlacement(DependencyObject element, PlacementType value) => element.SetValue(PlacementProperty, value);

    public static PlacementType GetPlacement(DependencyObject element) => (PlacementType) element.GetValue(PlacementProperty);

    public static readonly DependencyProperty StringFormatProperty = DependencyProperty.RegisterAttached(
        "StringFormat", typeof(string), typeof(TipElement), new PropertyMetadata("#0.0"));

    public static void SetStringFormat(DependencyObject element, string value)
        => element.SetValue(StringFormatProperty, value);

    public static string GetStringFormat(DependencyObject element)
        => (string) element.GetValue(StringFormatProperty);
}