Point2Weight.cs

using System.Threading.Tasks;
using System.Xml;
using Waher.Layout.Layout2D.Model.Attributes;
 
namespace Waher.Layout.Layout2D.Model
{
    public abstract class Point2Weight : Point2
    {
        private FloatAttribute w;
 
        public Point2Weight(Layout2DDocument Document, ILayoutElement Parent)
            : base(Document, Parent)
        {
        }
 
        public FloatAttribute WeightAttribute
        {
            get => this.w;
            set => this.w = value;
        }
 
        public override Task FromXml(XmlElement Input)
        {
            this.w = new FloatAttribute(Input, "w", this.Document);
            return base.FromXml(Input);
        }
 
        public override void ExportAttributes(XmlWriter Output)
        {
            base.ExportAttributes(Output);
 
            this.w?.Export(Output);
        }
 
        public override void CopyContents(ILayoutElement Destination)
        {
            base.CopyContents(Destination);
 
            if (Destination is Point2Weight Dest)
                Dest.w = this.w?.CopyIfNotPreset(Destination.Document);
        }
 
        public override async Task DoMeasureDimensions(DrawingState State)
        {
            await base.DoMeasureDimensions(State);
 
            EvaluationResult<float> Weight = await this.w.TryEvaluate(State.Session);
            if (Weight.Ok)
                this.weight = Weight.Result;
            else
                this.defined = false;
        }
 
        protected float weight;
 
        public override void ExportStateAttributes(XmlWriter Output)
        {
            base.ExportStateAttributes(Output);
 
            this.w?.ExportState(Output);
        }
 
    }
}