Distance.cs

using System.Threading.Tasks;
using System.Xml;
using Waher.Layout.Layout2D.Model.Attributes;
 
namespace Waher.Layout.Layout2D.Model
{
    public abstract class Distance : LayoutElement
    {
        private LengthAttribute distance;
 
        public Distance(Layout2DDocument Document, ILayoutElement Parent)
            : base(Document, Parent)
        {
        }
 
        public LengthAttribute DistanceAttribute
        {
            get => this.distance;
            set => this.distance = value;
        }
 
        public override Task FromXml(XmlElement Input)
        {
            this.distance = new LengthAttribute(Input, "distance", this.Document);
            return base.FromXml(Input);
        }
 
        public override void ExportAttributes(XmlWriter Output)
        {
            base.ExportAttributes(Output);
 
            this.distance?.Export(Output);
        }
 
        public override void CopyContents(ILayoutElement Destination)
        {
            base.CopyContents(Destination);
 
            if (Destination is Distance Dest)
                Dest.distance = this.distance?.CopyIfNotPreset(Destination.Document);
        }
 
        public override async Task DoMeasureDimensions(DrawingState State)
        {
            await base.DoMeasureDimensions(State);
 
            EvaluationResult<Length> Distance = await this.distance.TryEvaluate(State.Session);
            if (Distance.Ok)
                State.CalcDrawingSize(Distance.Result, ref this.dist, true, this);
            else
                this.defined = false;
        }
 
        protected float dist;
 
        public override void ExportStateAttributes(XmlWriter Output)
        {
            base.ExportStateAttributes(Output);
 
            this.distance?.ExportState(Output);
        }
    }
}