Text that adds an ellipses to a truncated text field

TruncatableText.cs

using UnityEngine.UI;

public class TruncatableText : Text
{
    public string ConcatText = "...";
    private string truncatedText;

    public override string text
    {
        get
        {
            return this.truncatedText;
        }
        set
        {
            if (string.IsNullOrEmpty(value))
            {
                if (string.IsNullOrEmpty(this.truncatedText))
                    return;
                this.m_Text = "";
                this.truncatedText = "";
                this.SetVerticesDirty();
            }
            else
            {
                if (!(this.m_Text != value))
                    return;
                this.m_Text = value;
                this.SetVerticesDirty();
                this.SetLayoutDirty();
            }
        }
    }

    protected override void OnPopulateMesh(VertexHelper toFill)
    {
        m_Text = m_Text.Trim();

        this.cachedTextGenerator.PopulateWithErrors(m_Text, this.GetGenerationSettings(this.rectTransform.rect.size), this.gameObject);
        int maxChars = this.cachedTextGenerator.characterCountVisible;
        truncatedText = m_Text.Substring(0, maxChars);
        if (maxChars < m_Text.Length)
        {
            truncatedText = truncatedText + ConcatText;
        }

        this.cachedTextGenerator.Invalidate();
        this.cachedTextGenerator.PopulateWithErrors(truncatedText, this.GetGenerationSettings(this.rectTransform.rect.size), this.gameObject);
        maxChars = this.cachedTextGenerator.characterCountVisible;
        string secondTruncatedText = truncatedText.Substring(0, maxChars);
        if (maxChars < truncatedText.Length)
        {
            truncatedText = secondTruncatedText + ConcatText;
        }
        this.cachedTextGenerator.Invalidate();

        base.OnPopulateMesh(toFill);
    }
}