using System.Drawing;

using SMath.Manager;
using SMath.Controls;
using SMath.Math;
using SMath.Drawing;

namespace CheckBoxPlugin
{
    class CheckBoxCanvas : RegionEvaluable
    {
        private bool flag;

        /// <summary>
        /// Defines whether Checkbox is checked or not. 
        /// </summary>
        internal bool Checked
        {
            get
            {
                return this.flag;
            }
            set
            {
                if (this.flag != value)
                {
                    this.flag = value;
                    base.CreateHistoryStep();
                }
            }
        }

        public CheckBoxCanvas(SessionProfile sessionProfile)
            : base(sessionProfile)
        {
            base.Size = new Size(22, 22);
        }

        public CheckBoxCanvas(CheckBoxCanvas region)
            : base(region)
        {
        }

        public override void OnPaint(PaintEventOptions e)
        {
            base.OnPaint(e);

            e.Graphics.FillRectangle(Checked ? ColorBrushes.Black : ColorBrushes.LightGray, e.ClipRectangle.X + 1, e.ClipRectangle.Y + 1, this.InnerBounds.Width - 2, this.InnerBounds.Height - 2);
        }

        public override void OnMouseDown(MouseEventOptions e)
        {
            this.Checked = !this.Checked;

            Invalidate();

            base.OnMouseDown(e);
        }

        public override void OnCommandSend(string value)
        {
            if (value == " ")
            {
                this.Checked = !this.Checked;

                // Request evaluation as soon as value changed
                RequestEvaluation();

                Invalidate();
                return;
            }

            base.OnCommandSend(value);
        }

        public override RegionBase Clone()
        {
            return new CheckBoxCanvas(this);
        }

        public override void OnEvaluation(Store store)
        {
            // Container handles all requests for evaluation
        }
    }
}