Avalonia/src/Avalonia.Base/Media/TextFormatting/TextCollapsingProperties.cs

using System.Collections.Generic;

namespace Avalonia.Media.TextFormatting
{
    /// <summary>
    /// Properties of text collapsing.
    /// </summary>
    public abstract class TextCollapsingProperties
    {
        /// <summary>
        /// Gets the width in which the collapsible range is constrained to.
        /// </summary>
        public abstract double Width { get; }

        /// <summary>
        /// Gets the text run that is used as collapsing symbol.
        /// </summary>
        public abstract TextRun Symbol { get; }

        /// <summary>
        /// Collapses given text line.
        /// </summary>
        /// <param name="textLine">Text line to collapse.</param>
        public abstract List<TextRun>? Collapse(TextLine textLine);
    }
}