using GeoSigmaDrawLib;
using System.Drawing;
using System.Windows.Forms;

namespace KevServer
{
    public class WebDrawViewOperator
    {
        public GeoSigmaXY Geo
        {
            get; set;
        } = null;
        private ViewOperationKind kind = ViewOperationKind.Invalid;
        private Point ptStart;
        private Point ptLast;
        /// <summary>
        /// 类型
        /// </summary>
        public ViewOperationKind Kind
        {
            get
            {
                return kind;
            }
            set
            {
                this.kind = value;
                ptStart.X = ptStart.Y = 0;
                // SetViewWindow
                Geo?.SetViewOperationKind(kind); // TODO:重命名SetViewPan
            }
        }
        /// <summary>
        /// Initializes a new instance of the <see cref="WebDrawViewOperator"/> class.
        /// </summary>
        /// <param name="geo">The geo.</param>
        public WebDrawViewOperator(GeoSigmaXY geo)
        {
            this.Geo = geo;
        }
        public void OnLButtonDown(MouseEventArgs e)
        {
            ptStart = new Point(e.X, e.Y);
            ptLast = new Point(e.X, e.Y);
            if (this.kind == ViewOperationKind.ViewPan)
            {
                Geo.ViewMouseDown(e.X, e.Y);
            }
            else
            {
                Geo.ViewMouseDown(e.X, e.Y);
            }
        }
        public bool OnLButtonUp(MouseEventArgs e)
        {
            ptLast = new Point(e.X, e.Y);
            if (ptLast.X - ptStart.X > 0 || ptLast.Y - ptStart.Y != 0)
            {
                Geo.ViewMouseUp(e.X, e.Y);
                return true;
            }
            return false;
        }
    }
}