LayoutFarm.Text.EditableTextRun.Remove C# (CSharp) Method

        internal override EditableRun Remove(int startIndex, int length, bool withFreeRun)
        {
            EditableRun freeRun = null;
            if (startIndex > -1 && length > 0)
            {
                int oldLexLength = mybuffer.Length;
                char[] newBuff = new char[oldLexLength - length];
                if (withFreeRun)
                {
                    freeRun = MakeTextRun(startIndex, length);
                }
                if (startIndex > 0)
                {
                    Array.Copy(mybuffer, 0, newBuff, 0, startIndex);
                }

                Array.Copy(mybuffer, startIndex + length, newBuff, startIndex, oldLexLength - startIndex - length);
                this.mybuffer = newBuff;
                UpdateRunWidth();
            }

            if (withFreeRun)
            {
                return freeRun;
            }
            else
            {
                return null;
            }
        }
    }