using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Diagnostics;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

//using System.Timers;

using System.Windows.Forms;

using System.Drawing;

namespace SharpDisplayManager

{

    class MarqueeLabel : Label

    {

        private bool iOwnTimer;

        [Category("Behavior")]

        [Description("How fast is our text scrolling, in pixels per second.")]

        [DefaultValue(32)]

        [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]

        public int PixelsPerSecond { get; set; }

        [Category("Behavior")]

        [Description("Use an internal or an external timer.")]

        [DefaultValue(true)]

        [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]

        public bool OwnTimer

        {

            get

            {

                return iOwnTimer;

            }

            set

            {

                iOwnTimer = value;

                if (iOwnTimer)

                {

                    Timer = new Timer();

                    Timer.Interval = 10;

                    Timer.Tick += new EventHandler(Timer_Tick);

                    Timer.Start();

                }

                else

                {

                    if (Timer != null)

                        Timer.Dispose();

                    Timer = null;

                }

            }

        }

        private int CurrentPosition { get; set; }

        private Timer Timer { get; set; }

        private DateTime LastTickTime { get; set; }

        private double PixelsLeft { get; set; }

        //DateTime a = new DateTime(2010, 05, 12, 13, 15, 00);

        //DateTime b = new DateTime(2010, 05, 12, 13, 45, 00);

        //Console.WriteLine(b.Subtract(a).TotalMinutes);

        public MarqueeLabel()

        {

            UseCompatibleTextRendering = true;

            //PixelsPerSecond = 32;

            LastTickTime = DateTime.Now;

            PixelsLeft = 0;

        }

        public void UpdateAnimation(DateTime aLastTickTime, DateTime aNewTickTime)

        {

            while (CurrentPosition > Width)

            {

                CurrentPosition = -Width;

            }

            PixelsLeft += aNewTickTime.Subtract(aLastTickTime).TotalSeconds * PixelsPerSecond;

            //Keep track of our pixels left over

            //PixelsLeft = offset - Math.Truncate(offset);

            double offset = Math.Truncate(PixelsLeft);

            PixelsLeft -= offset;

            CurrentPosition += Convert.ToInt32(offset);

            /*

            if (offset > 1.0)

            {

                BackColor = Color.Red;

            }

            else if (offset==1.0)

            {

                if (BackColor != Color.White)

                {

                    BackColor = Color.White;

                }

            }

            else

            {

                //Too slow

                //BackColor = Color.Green;

            }*/

            //Only redraw if something has changed

            if (offset != 0)

            {

                Invalidate();

            }

        }

        void Timer_Tick(object sender, EventArgs e)

        {

            DateTime NewTickTime = DateTime.Now;                       

            //

            UpdateAnimation(LastTickTime, NewTickTime);

            //

            LastTickTime = NewTickTime;

        }

        protected override void OnPaint(PaintEventArgs e)

        {

            //Disable anti-aliasing

            e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;

            e.Graphics.TranslateTransform((float)CurrentPosition, 0);

            base.OnPaint(e);

        }

        protected override void Dispose(bool disposing)

        {

            if (disposing)

            {

                if (Timer != null)

                    Timer.Dispose();

            }

            Timer = null;

        }

    }

}