OverlayCells.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using Waher.Script;
 
namespace Waher.Layout.Layout2D.Model.Groups
{
    public class OverlayCells : ICellLayout
    {
        private readonly List<Padding> measured = new List<Padding>();
        private readonly Variables session;
        private float maxWidth = 0;
        private float maxHeight = 0;
 
        public OverlayCells(Variables Session)
        {
            this.session = Session;
        }
 
        public Task Add(ILayoutElement Element)
        {
            this.measured.Add(new Padding(Element, 0, 0));
 
            float Width = Element.Width ?? 0;
            if (Width > this.maxWidth)
                this.maxWidth = Width;
 
            float Height = Element.Height ?? 0;
            if (Height > this.maxHeight)
                this.maxHeight = Height;
        
            return Task.CompletedTask;
        }
 
        public void Flush()
        {
        }
 
        public void MeasurePositions(DrawingState State)
        {
            ILayoutElement Element;
 
            foreach (Padding P in this.measured)
            {
                Element = P.Element;
 
                Element.MeasurePositions(State);
                P.OffsetX -= Element.Left ?? 0;
                P.OffsetY -= Element.Top ?? 0;
            }
        }
 
        public float TotWidth => this.maxWidth;
 
        public float TotHeight => this.maxHeight;
 
        public void Distribute(bool SetPosition)
        {
            foreach (Padding P in this.measured)
                P.Distribute(this.maxWidth, this.maxHeight, this.session, SetPosition);
        }
 
        public Padding[] Align()
        {
            return this.measured.ToArray();
        }
    }
}