XAML-Map-Control/MapControl/Shared/ViewportChangedEventArgs.cs

using System;

namespace MapControl;

public class ViewportChangedEventArgs(bool projectionChanged = false, bool transformCenterChanged = false) : EventArgs
{
    /// <summary>
    /// Indicates that the map projection has changed. Used to control when
    /// a MapTileLayer or a MapImageLayer should be updated immediately,
    /// or MapPath Data in projected map coordinates should be recalculated.
    /// </summary>
    public bool ProjectionChanged => projectionChanged;

    /// <summary>
    /// Indicates that the view transform center has moved across 180° longitude.
    /// Used to control when a MapTileLayer should be updated immediately.
    /// </summary>
    public bool TransformCenterChanged => transformCenterChanged;
}