PositiveIntegerAttribute.cs

using System.Xml;
using Waher.Script;
 
namespace Waher.Layout.Layout2D.Model.Attributes
{
    public class PositiveIntegerAttribute : Attribute<int>
    {
        public PositiveIntegerAttribute(string AttributeName, int Value, Layout2DDocument Document)
            : base(AttributeName, Value, Document)
        {
        }
 
        public PositiveIntegerAttribute(XmlElement E, string AttributeName, Layout2DDocument Document)
            : base(E, AttributeName, true, Document)
        {
        }
 
        public PositiveIntegerAttribute(string AttributeName, Expression Expression, Layout2DDocument Document)
            : base(AttributeName, Expression, Document)
        {
        }
 
        public override bool TryConvert(object Result, out int Value)
        {
            if (Result is double d)
            {
                Value = (int)(d + 0.5);
                return true;
            }
            else
                return base.TryConvert(Result, out Value);
        }
 
        public override bool TryParse(string StringValue, out int Value)
        {
            if (int.TryParse(StringValue, out Value))
                return Value > 0;
            else
                return false;
        }
 
        public override string ToString(int Value)
        {
            return Value.ToString();
        }
 
        public PositiveIntegerAttribute CopyIfNotPreset(Layout2DDocument ForDocument)
        {
            if (this.HasPresetValue)
                return this;
            else
                return new PositiveIntegerAttribute(this.Name, this.Expression, ForDocument);
        }
 
    }
}