// -----------------------------------------------------------------------
// <copyright file="GanttChart.cs">
// http://www.codeproject.com/Articles/20731/Gantt-Chart
// <summary>
// Adds an easy to use Gantt Chart to your application
// Created by Adrian "Adagio" Grau
// Version 0.55
// </summary>
// <remarks></remarks>
// </copyright>
// -----------------------------------------------------------------------

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Drawing.Drawing2D;
    using System.Drawing;
    using System.Windows.Forms;

    /// <summary>
    /// TODO: Update summary.
    /// </summary>
    public class GanttChart : Control
    {

        private MouseOverPart mouseHoverPart = MouseOverPart.Empty;

        private int mouseHoverBarIndex = -1;
        private List<ChartBarDate> bars = new List<ChartBarDate>();
        private System.DateTime headerFromDate;

        private System.DateTime headerToDate;

        private int barIsChanging = -1;
        private int barStartRight = 20;
        private int barStartLeft = 100;
        private int headerTimeStartTop = 30;

        private List<Header> shownHeaderList;
        private int barStartTop = 50;
        private int barHeight = 9;

        private int barSpace = 5;

        private int widthPerItem;
        private System.DateTime _mouseOverColumnValue;
        private string _mouseOverRowText = "";

        private object _mouseOverRowValue = null;
        private Pen lineColor = Pens.Bisque;
        private Font dateTextFont = new Font("VERDANA", 8.0f, FontStyle.Regular, GraphicsUnit.Point);
        private Font timeTextFont = new Font("VERDANA", 8.0f, FontStyle.Regular, GraphicsUnit.Point);

        private Font rowTextFont = new Font("VERDANA", 8.0f, FontStyle.Regular, GraphicsUnit.Point);
        private System.Windows.Forms.ToolTip withEventsField_ToolTip = new System.Windows.Forms.ToolTip();
        internal System.Windows.Forms.ToolTip ToolTip
        {
            get { return withEventsField_ToolTip; }
            set
            {
                if (withEventsField_ToolTip != null)
                {
                    withEventsField_ToolTip.Draw -= ToolTipText_Draw;
                    withEventsField_ToolTip.Popup -= ToolTipText_Popup;
                }
                withEventsField_ToolTip = value;
                if (withEventsField_ToolTip != null)
                {
                    withEventsField_ToolTip.Draw += ToolTipText_Draw;
                    withEventsField_ToolTip.Popup += ToolTipText_Popup;
                }
            }

        }

        private bool _allowEditBarWithMouse = false;
        public event MouseDraggedEventHandler MouseDragged;
        public delegate void MouseDraggedEventHandler(object sender, System.Windows.Forms.MouseEventArgs e);
        public event BarChangedEventHandler BarChanged;
        public delegate void BarChangedEventHandler(object sender, object barValue);

        private Bitmap objBmp;

        private Graphics objGraphics;

        protected new bool DesignMode
        {
            get
            {
                if (base.DesignMode)
                    return true;

                return System.ComponentModel.LicenseManager.UsageMode == System.ComponentModel.LicenseUsageMode.Designtime;
            }
        }

        #region "Public properties"

        /// <summary>
        /// Sets to true if the user should be able to manually edit bars
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public bool AllowManualEditBar
        {
            get { return _allowEditBarWithMouse; }
            set { _allowEditBarWithMouse = value; }
        }

        /// <summary>
        /// The start date/time of the chart
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public System.DateTime FromDate
        {
            get { return headerFromDate; }
            set { headerFromDate = value; }
        }

        /// <summary>
        /// The end date/time of the chart
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public System.DateTime ToDate
        {
            get { return headerToDate; }
            set { headerToDate = value; }
        }

        /// <summary>
        /// The text for the current row the mouse hovers above
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public string MouseOverRowText
        {
            get { return _mouseOverRowText; }
        }

        /// <summary>
        /// The value for the current bar the mouse hovers above
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public object MouseOverRowValue
        {
            get { return _mouseOverRowValue; }
        }

        /// <summary>
        /// The date/time the mouse hovers above
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public System.DateTime MouseOverColumnDate
        {
            get { return _mouseOverColumnValue; }
        }

        /// <summary>
        /// The color of the grid
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public System.Drawing.Pen GridColor
        {
            get { return lineColor; }
            set { lineColor = value; }
        }

        /// <summary>
        /// The font used for the row text
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public Font RowFont
        {
            get { return rowTextFont; }
            set { rowTextFont = value; }
        }

        /// <summary>
        /// The font used for the "date" text in the columns
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public Font DateFont
        {
            get { return dateTextFont; }
            set { dateTextFont = value; }
        }

        /// <summary>
        /// The font used for the "time" text in the colums)
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public Font TimeFont
        {
            get { return timeTextFont; }
            set { timeTextFont = value; }
        }

        #endregion

        #region "Constructor"

        /// <summary>
        /// Default constructor
        /// </summary>
        /// <remarks></remarks>

        public GanttChart()
        {
            if (!DesignMode)
            {

                MouseWheel += GanttChart_MouseWheel;
                MouseClick += GanttChart_Click;
                MouseDragged += GanttChart_MouseDragged;
                MouseLeave += GanttChart_MouseLeave;
                MouseMove += GanttChart_MouseMove;
                ToolTip.AutoPopDelay = 15000;
                ToolTip.InitialDelay = 250;
                ToolTip.OwnerDraw = true;

                objBmp = new Bitmap(1280, 1024, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
                objGraphics = Graphics.FromImage(objBmp);

                // Flicker free drawing

                this.SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
            }

        }

        #endregion

        #region "Bars"

        private void SetBarStartLeft(string rowText)
        {
            Graphics gfx = this.CreateGraphics();

            int length = Convert.ToInt32(gfx.MeasureString(rowText, rowTextFont, 500).Width);

            if (length > barStartLeft)
            {
                barStartLeft = length;
            }
        }

        /// <summary>
        /// Adds a bar to the list
        /// </summary>
        /// <param name="rowText">Text for the row</param>
        /// <param name="barValue">Value for the row</param>
        /// <param name="fromTime">The date/time the bar starts</param>
        /// <param name="toTime">The date/time the bar ends</param>
        /// <param name="color">The color of the bar</param>
        /// <param name="hoverColor">The hover color of the bar</param>
        /// <param name="rowIndex">The rowindex of the bar (useful if you want several bars on the same row)</param>
        /// <remarks></remarks>

        public void AddChartBar(string rowText, object barValue, System.DateTime fromTime, System.DateTime toTime, Color color, Color hoverColor, int rowIndex)
        {
            ChartBarDate bar = new ChartBarDate();
            bar.Text = rowText;
            bar.Value = barValue;
            bar.StartValue = fromTime;
            bar.EndValue = toTime;
            bar.Color = color;
            bar.HoverColor = hoverColor;
            bar.RowIndex = rowIndex;
            bars.Add(bar);

            SetBarStartLeft(rowText);
        }

        /// <summary>
        /// Adds a bar to the list
        /// </summary>
        /// <param name="rowText">Text for the row</param>
        /// <param name="barValue">Value for the row</param>
        /// <param name="fromTime">The date/time the bar starts</param>
        /// <param name="toTime">The date/time the bar ends</param>
        /// <param name="color">The color of the bar</param>
        /// <param name="hoverColor">The hover color of the bar</param>
        /// <param name="rowIndex">The rowindex of the bar (useful if you want several bars on the same row)</param>
        /// <param name="hideFromMouseMove">If you want to "hide" the bar from mousemove event</param>
        /// <remarks></remarks>

        public void AddChartBar(string rowText, object barValue, System.DateTime fromTime, System.DateTime toTime, Color color, Color hoverColor, int rowIndex, bool hideFromMouseMove)
        {
            ChartBarDate bar = new ChartBarDate();
            bar.Text = rowText;
            bar.Value = barValue;
            bar.StartValue = fromTime;
            bar.EndValue = toTime;
            bar.Color = color;
            bar.HoverColor = hoverColor;
            bar.RowIndex = rowIndex;
            bar.HideFromMouseMove = hideFromMouseMove;
            bars.Add(bar);

            SetBarStartLeft(rowText);
        }

        /// <summary>
        /// Gets the next index
        /// </summary>
        /// <param name="rowText"></param>
        /// <returns></returns>
        /// <remarks></remarks>

        public int GetIndexChartBar(string rowText)
        {
            int index = -1;

            foreach (ChartBarDate bar in bars)
            {
                if (bar.Text.Equals(rowText) == true)
                {
                    return bar.RowIndex;
                }
                if (bar.RowIndex > index)
                {
                    index = bar.RowIndex;
                }
            }

            return index + 1;
        }

        /// <summary>
        /// Removes all bars from list
        /// </summary>
        /// <remarks></remarks>

        public void RemoveBars()
        {
            bars = new List<ChartBarDate>();

            barStartLeft = 100;
        }

        #endregion

        #region "Draw"

        /// <summary>
        /// Redraws the Gantt chart
        /// </summary>
        /// <remarks></remarks>

        public void PaintChart()
        {
            this.Invalidate();
        }

        /// <summary>
        /// Redraws the Gantt chart
        /// </summary>
        /// <param name="gfx"></param>
        /// <remarks></remarks>

        private void PaintChart(Graphics gfx)
        {
            gfx.Clear(this.BackColor);

            if (headerFromDate == null | headerToDate == null)
                return;

            DrawScrollBar(gfx);
            DrawHeader(gfx, null);
            DrawNetHorizontal(gfx);
            DrawNetVertical(gfx);
            DrawBars(gfx);

            objBmp = new Bitmap(this.Width - barStartRight, lastLineStop, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            objGraphics = Graphics.FromImage(objBmp);
        }

        /// <summary>
        /// Redraws the Gantt chart
        /// </summary>
        /// <param name="pe"></param>
        /// <remarks></remarks>

        protected override void OnPaint(System.Windows.Forms.PaintEventArgs pe)
        {
            base.OnPaint(pe);
            if (!DesignMode)
            {
                PaintChart(pe.Graphics);
            }
        }

        /// <summary>
        /// Draws the list of headers. Automatically shows which headers to draw, based on the width of the Gantt Chart
        /// </summary>
        /// <param name="gfx"></param>
        /// <param name="headerList"></param>
        /// <remarks></remarks>

        private void DrawHeader(Graphics gfx, List<Header> headerList)
        {
            if (headerList == null)
            {
                headerList = GetFullHeaderList();
            }

            if (headerList.Count == 0)
                return;

            dynamic availableWidth = this.Width - 10 - barStartLeft - barStartRight;
            widthPerItem = availableWidth / headerList.Count;

            if (widthPerItem < 40)
            {
                List<Header> newHeaderList = new List<Header>();

                bool showNext = true;

                // If there's not enough room for all headers remove 50%

                foreach (Header header in headerList)
                {
                    if (showNext == true)
                    {
                        newHeaderList.Add(header);
                        showNext = false;
                    }
                    else
                    {
                        showNext = true;
                    }
                }

                DrawHeader(gfx, newHeaderList);
                return;
            }

            int index = 0;
            int headerStartPosition = -1;
            Header lastHeader = null;

            foreach (Header header in headerList)
            {
                int startPos = barStartLeft + (index * widthPerItem);
                bool showDateHeader = false;

                header.StartLocation = startPos;

                // Checks whether to show the date or not

                if (lastHeader == null)
                {
                    showDateHeader = true;
                }
                else if (header.Time.Hour < lastHeader.Time.Hour)
                {
                    showDateHeader = true;
                }
                else if (header.Time.Minute == lastHeader.Time.Minute)
                {
                    showDateHeader = true;
                }

                // Show date

                if (showDateHeader == true)
                {
                    string str = "";

                    if (header.HeaderTextInsteadOfTime.Length > 0)
                    {
                        str = header.HeaderTextInsteadOfTime;
                    }
                    else
                    {
                        str = header.Time.ToString("d-MMM");
                    }
                    gfx.DrawString(str, dateTextFont, Brushes.Black, startPos, 0);
                }

                // Show time

                gfx.DrawString(header.HeaderText, timeTextFont, Brushes.Black, startPos, headerTimeStartTop);
                index += 1;

                lastHeader = header;
            }

            shownHeaderList = headerList;
            widthPerItem = (this.Width - 10 - barStartLeft - barStartRight) / shownHeaderList.Count;
        }

        /// <summary>
        /// Draws the bars
        /// </summary>
        /// <param name="grfx"></param>
        /// <remarks></remarks>

        private void DrawBars(Graphics grfx, bool ignoreScrollAndMousePosition = false)
        {
            if (shownHeaderList == null)
                return;
            if (shownHeaderList.Count == 0)
                return;

            int index = 0;

            // Finds pixels per minute

            TimeSpan timeBetween = shownHeaderList[1].Time - shownHeaderList[0].Time;
            int minutesBetween = Convert.ToInt32(timeBetween.TotalMinutes);
            //(timeBetween.Days * 1440) + (timeBetween.Hours * 60) + timeBetween.Minutes
            dynamic widthBetween = (shownHeaderList[1].StartLocation - shownHeaderList[0].StartLocation);
            decimal perMinute = widthBetween / minutesBetween;

            // Draws each bar

            foreach (ChartBarDate bar in bars)
            {
                index = bar.RowIndex;

                int startLocation = 0;
                int width = 0;
                int startMinutes = 0;
                // Number of minutes from start of the gantt chart
                TimeSpan startTimeSpan = default(TimeSpan);
                int lengthMinutes = 0;
                // Number of minutes from bar start to bar end
                TimeSpan lengthTimeSpan = default(TimeSpan);

                int scrollPos = 0;

                if (ignoreScrollAndMousePosition == false)
                {
                    scrollPos = scrollPosition;
                }

                // Calculates where the bar should be located

                startTimeSpan = bar.StartValue - FromDate;
                startMinutes = (startTimeSpan.Days * 1440) + (startTimeSpan.Hours * 60) + startTimeSpan.Minutes;

                startLocation = Convert.ToInt32(perMinute * startMinutes);

                System.DateTime endValue = bar.EndValue;

                if (endValue == null)
                {
                    endValue = System.DateTime.Now;
                }

                lengthTimeSpan = endValue - bar.StartValue;
                lengthMinutes = (lengthTimeSpan.Days * 1440) + (lengthTimeSpan.Hours * 60) + lengthTimeSpan.Minutes;

                width = Convert.ToInt32(perMinute * lengthMinutes);

                int a = barStartLeft + startLocation;
                int b = barStartTop + (barHeight * (index - scrollPos)) + (barSpace * (index - scrollPos)) + 2;
                int c = width;
                int d = barHeight;

                if (c == 0)
                    c = 1;

                // Stops a bar from going into the row-text area

                if (a - barStartLeft < 0)
                {
                    a = barStartLeft;
                }

                System.Drawing.Color color = default(System.Drawing.Color);

                // If mouse is over bar, set the color to be hovercolor

                if (MouseOverRowText == bar.Text & bar.StartValue <= _mouseOverColumnValue & bar.EndValue >= _mouseOverColumnValue)
                {
                    color = bar.HoverColor;
                }
                else
                {
                    color = bar.Color;
                }

                // Set the location for the graphics

                bar.TopLocation.Left = new Point(a, b);
                bar.TopLocation.Right = new Point(a + c, b);
                bar.BottomLocation.Left = new Point(a, b + d);
                bar.BottomLocation.Right = new Point(a, b + d);

                LinearGradientBrush obBrush = null;
                Rectangle obRect = new Rectangle(a, b, c, d);

                if (bar.StartValue != null & endValue != null)
                {

                    if ((index >= scrollPos & index < barsViewable + scrollPos) | ignoreScrollAndMousePosition == true)
                    {
                        // Makes the bar gradient

                        obBrush = new LinearGradientBrush(obRect, color, Color.Gray, LinearGradientMode.Vertical);

                        // Draws the bar

                        grfx.DrawRectangle(Pens.Black, obRect);
                        grfx.FillRectangle(obBrush, obRect);

                        // Draws the rowtext

                        grfx.DrawString(bar.Text, rowTextFont, Brushes.Black, 0, barStartTop + (barHeight * (index - scrollPos)) + (barSpace * (index - scrollPos)));

                        obBrush = null;
                        //obRect = null;
                        //obRect.TryDispose();
                        obBrush = null;
                    }
                }

                //color = null;
                //color.TryDispose();
            }
        }

        /// <summary>
        /// Draws the vertical lines
        /// </summary>
        /// <param name="grfx"></param>
        /// <remarks></remarks>

        public void DrawNetVertical(Graphics grfx)
        {
            if (shownHeaderList == null)
                return;
            if (shownHeaderList.Count == 0)
                return;

            int index = 0;
            int availableWidth = this.Width - 10 - barStartLeft - barStartRight;
            Header lastHeader = null;

            foreach (Header header in shownHeaderList)
            {
                int headerLocationY = 0;

                if (lastHeader == null)
                {
                    headerLocationY = 0;
                }
                else if (header.Time.Hour < lastHeader.Time.Hour)
                {
                    headerLocationY = 0;
                }
                else
                {
                    headerLocationY = headerTimeStartTop;
                }

                grfx.DrawLine(Pens.Bisque, barStartLeft + (index * widthPerItem), headerLocationY, barStartLeft + (index * widthPerItem), lastLineStop);
                index += 1;

                lastHeader = header;
            }

            grfx.DrawLine(lineColor, barStartLeft + (index * widthPerItem), headerTimeStartTop, barStartLeft + (index * widthPerItem), lastLineStop);
        }

        /// <summary>
        /// Draws the horizontal lines
        /// </summary>
        /// <param name="grfx"></param>
        /// <remarks></remarks>

        public void DrawNetHorizontal(Graphics grfx)
        {
            if (shownHeaderList == null)
                return;
            if (shownHeaderList.Count == 0)
                return;

            int index = 0;
            int width = (widthPerItem * shownHeaderList.Count) + barStartLeft;

            // Last used index. Hopefully nobody will make a row named QQQ :o)
            for (index = 0; index <= GetIndexChartBar("QQQQQQ"); index++)
            {
                foreach (ChartBarDate bar in bars)
                {
                    grfx.DrawLine(lineColor, 0, barStartTop + (barHeight * index) + (barSpace * index), width, barStartTop + (barHeight * index) + (barSpace * index));
                }
            }

            lastLineStop = barStartTop + (barHeight * (index - 1)) + (barSpace * (index - 1));
        }

        // This is the position (in pixels, from top) of the last line. Used for drawing lines


        private int lastLineStop = 0;
        #endregion

        #region "Header list"

        /// <summary>
        /// Gets the full header list, consisting of hours between the two dates set
        /// </summary>
        /// <returns></returns>
        /// <remarks></remarks>

        private List<Header> GetFullHeaderList()
        {
            List<Header> result = new List<Header>();
            System.DateTime newFromTime = new System.DateTime(FromDate.Year, FromDate.Month, FromDate.Day);
            string item = null;

            TimeSpan interval = ToDate - FromDate;

            if (interval.TotalDays < 1)
            {
                var _with1 = newFromTime;
                newFromTime = _with1.AddHours(FromDate.Hour);

                if (headerFromDate.Minute < 59 & headerFromDate.Minute > 29)
                {
                    newFromTime = _with1.AddMinutes(30);
                }
                else
                {
                    newFromTime = _with1.AddMinutes(0);
                }

                while (newFromTime <= ToDate)
                {
                    item = newFromTime.Hour + ":";

                    if (newFromTime.Minute < 10)
                    {
                        item += "0" + newFromTime.Minute;
                    }
                    else
                    {
                        item += "" + newFromTime.Minute;
                    }

                    Header header = new Header();

                    header.HeaderText = item;
                    header.HeaderTextInsteadOfTime = "";
                    header.Time = new System.DateTime(newFromTime.Year, newFromTime.Month, newFromTime.Day, newFromTime.Hour, newFromTime.Minute, 0);
                    result.Add(header);

                    newFromTime = newFromTime.AddMinutes(5);
                    // The minimum interval of time between the headers
                }
            }
            else if (interval.TotalDays < 60)
            {
                while (newFromTime <= ToDate)
                {
                    Header header = new Header();

                    header.HeaderText = "";
                    header.HeaderTextInsteadOfTime = "";
                    header.Time = new System.DateTime(newFromTime.Year, newFromTime.Month, newFromTime.Day, 0, 0, 0);
                    result.Add(header);

                    newFromTime = newFromTime.AddDays(1);
                    // The minimum interval of time between the headers
                }
            }
            else
            {
                while (newFromTime <= ToDate)
                {
                    Header header = new Header();

                    header.HeaderText = "";
                    header.Time = new System.DateTime(newFromTime.Year, newFromTime.Month, newFromTime.Day, 0, 0, 0);
                    header.HeaderTextInsteadOfTime = newFromTime.ToString("MMM");
                    result.Add(header);

                    newFromTime = newFromTime.AddMonths(1);
                    // The minimum interval of time between the headers
                }
            }

            return result;
        }

        #endregion

        #region "Mouse Move"

        /// <summary>
        /// Finds the current row and column based on mouse position
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <remarks></remarks>

        private void GanttChart_MouseMove(System.Object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (shownHeaderList == null)
                return;
            if (shownHeaderList.Count == 0)
                return;

            if (e.Button != System.Windows.Forms.MouseButtons.Left)
            {
                mouseHoverPart = MouseOverPart.Empty;

                // If bar has changed manually, but left mouse button is no longer pressed the BarChanged event will be raised

                if (AllowManualEditBar == true)
                {
                    if (barIsChanging >= 0)
                    {
                        if (BarChanged != null)
                        {
                            BarChanged(this, bars[barIsChanging].Value);
                        }
                        barIsChanging = -1;
                    }
                }
            }

            mouseHoverBarIndex = -1;

            Point LocalMousePosition = default(Point);

            LocalMousePosition = this.PointToClient(Cursor.Position);

            // Finds pixels per minute

            TimeSpan timeBetween = shownHeaderList[1].Time - shownHeaderList[0].Time;
            int minutesBetween = (timeBetween.Days * 1440) + (timeBetween.Hours * 60) + timeBetween.Minutes;
            dynamic widthBetween = (shownHeaderList[1].StartLocation - shownHeaderList[0].StartLocation);
            decimal perMinute = widthBetween / minutesBetween;

            // Finds the time at mousepointer

            int minutesAtCursor = 0;

            if (LocalMousePosition.X > barStartLeft && perMinute > 0)
            {
                minutesAtCursor = Convert.ToInt32((LocalMousePosition.X - barStartLeft) / perMinute);
                _mouseOverColumnValue = FromDate.AddMinutes(minutesAtCursor);
            }
            else
            {
                //_mouseOverColumnValue.TryDispose();
            }

            // Finds the row at mousepointer

            string rowText = "";
            object rowValue = null;
            string columnText = "";

            // Tests to see if the mouse pointer is hovering above the scrollbar

            bool scrollBarStatusChanged = false;

            // Tests to see if the mouse is hovering over the scroll-area bottom-arrow

            if (LocalMousePosition.X > BottomPart.Left & LocalMousePosition.Y < BottomPart.Right & LocalMousePosition.Y < BottomPart.Bottom & LocalMousePosition.Y > BottomPart.Top)
            {
                if (mouseOverBottomPart == false)
                {
                    scrollBarStatusChanged = true;
                }

                mouseOverBottomPart = true;
            }
            else
            {
                if (mouseOverBottomPart == false)
                {
                    scrollBarStatusChanged = true;
                }

                mouseOverBottomPart = false;
            }

            // Tests to see if the mouse is hovering over the scroll-area top-arrow

            if (LocalMousePosition.X > topPart.Left & LocalMousePosition.Y < topPart.Right & LocalMousePosition.Y < topPart.Bottom & LocalMousePosition.Y > topPart.Top)
            {
                if (mouseOverTopPart == false)
                {
                    scrollBarStatusChanged = true;
                }

                mouseOverTopPart = true;
            }
            else
            {
                if (mouseOverTopPart == false)
                {
                    scrollBarStatusChanged = true;
                }

                mouseOverTopPart = false;
            }

            // Tests to see if the mouse is hovering over the scroll

            if (LocalMousePosition.X > scroll.Left & LocalMousePosition.Y < scroll.Right & LocalMousePosition.Y < scroll.Bottom & LocalMousePosition.Y > scroll.Top)
            {
                if (mouseOverScrollBar == false)
                {
                    scrollBarStatusChanged = true;
                }

                mouseOverScrollBar = true;
                mouseOverScrollBarArea = true;
            }
            else
            {
                if (mouseOverScrollBar == false)
                {
                    scrollBarStatusChanged = true;
                }

                mouseOverScrollBar = false;
                mouseOverScrollBarArea = false;
            }

            // If the mouse is not above the scroll, test if it's over the scroll area (no need to test if it's not above the scroll)

            if (mouseOverScrollBarArea == false)
            {
                if (LocalMousePosition.X > scrollBarArea.Left & LocalMousePosition.Y < scrollBarArea.Right & LocalMousePosition.Y < scrollBarArea.Bottom & LocalMousePosition.Y > scrollBarArea.Top)
                {
                    mouseOverScrollBarArea = true;
                }
            }


            // Tests to see if the mouse pointer is hovering above a bar

            int index = 0;


            foreach (ChartBarDate bar in bars)
            {
                // If the bar is set to be hidden from mouse move, the current bar will be ignored

                if (bar.HideFromMouseMove == false)
                {
                    if (bar.EndValue == null)
                    {
                        bar.EndValue = System.DateTime.Now;
                    }

                    // Mouse pointer needs to be inside the X and Y positions of the bar

                    if (LocalMousePosition.Y > bar.TopLocation.Left.Y & LocalMousePosition.Y < bar.BottomLocation.Left.Y)
                    {

                        if (LocalMousePosition.X > bar.TopLocation.Left.X & LocalMousePosition.X < bar.TopLocation.Right.X)
                        {
                            // If the current bar is the one where the mouse is above, the rowText and rowValue needs to be set correctly

                            rowText = bar.Text;
                            rowValue = bar.Value;
                            mouseHoverBarIndex = index;

                            if (mouseHoverPart != MouseOverPart.BarLeftSide & mouseHoverPart != MouseOverPart.BarRightSide)
                            {
                                mouseHoverPart = MouseOverPart.Bar;
                            }
                        }

                        // If mouse pointer is near the edges of the bar it will open up for editing the bar

                        if (AllowManualEditBar == true)
                        {
                            int areaSize = 5;

                            if (e.Button == System.Windows.Forms.MouseButtons.Left)
                            {
                                areaSize = 50;
                            }

                            if (LocalMousePosition.X > bar.TopLocation.Left.X - areaSize & LocalMousePosition.X < bar.TopLocation.Left.X + areaSize & mouseHoverPart != MouseOverPart.BarRightSide)
                            {
                                this.Cursor = Cursors.VSplit;
                                mouseHoverPart = MouseOverPart.BarLeftSide;
                                mouseHoverBarIndex = index;
                            }
                            else if (LocalMousePosition.X > bar.TopLocation.Right.X - areaSize & LocalMousePosition.X < bar.TopLocation.Right.X + areaSize & mouseHoverPart != MouseOverPart.BarLeftSide)
                            {
                                this.Cursor = Cursors.VSplit;
                                mouseHoverPart = MouseOverPart.BarRightSide;
                                mouseHoverBarIndex = index;
                            }
                            else
                            {
                                this.Cursor = Cursors.Default;
                            }
                        }
                    }
                }

                index += 1;
            }

            // Sets the mouseover row value and text

            _mouseOverRowText = rowText;
            _mouseOverRowValue = rowValue;

            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                if (MouseDragged != null)
                {
                    MouseDragged(sender, e);
                }

            }
            else
            {
                // A simple test to see if the mousemovement has caused any changes to how it should be displayed 
                // It only redraws if mouse moves from a bar to blank area or from blank area to a bar
                // This increases performance compared to having a redraw every time a mouse moves

                if ((_mouseOverRowValue == null & (rowValue != null)) | ((_mouseOverRowValue != null) & rowValue == null) | scrollBarStatusChanged == true)
                {
                    PaintChart();
                }
            }
        }

        /// <summary>
        /// Mouse leave event
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <remarks></remarks>

        private void GanttChart_MouseLeave(System.Object sender, System.EventArgs e)
        {
            _mouseOverRowText = null;
            _mouseOverRowValue = null;
            mouseHoverPart = MouseOverPart.Empty;

            PaintChart();
        }

        /// <summary>
        /// Mouse drag event
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <remarks></remarks>

        public void GanttChart_MouseDragged(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (mouseOverScrollBarArea == true)
            {
                ScrollPositionY = e.Location.Y;
            }

            if (AllowManualEditBar == true)
            {
                if (mouseHoverBarIndex > -1)
                {
                    if (mouseHoverPart == MouseOverPart.BarLeftSide)
                    {
                        barIsChanging = mouseHoverBarIndex;
                        bars[mouseHoverBarIndex].StartValue = _mouseOverColumnValue;
                        PaintChart();
                    }
                    else if (mouseHoverPart == MouseOverPart.BarRightSide)
                    {
                        barIsChanging = mouseHoverBarIndex;
                        bars[mouseHoverBarIndex].EndValue = _mouseOverColumnValue;
                        PaintChart();
                    }
                }
            }
        }


        #endregion

        #region "ToolTipText"

        private List<string> _toolTipText = new List<string>();

        private string _toolTipTextTitle = "";

        private Point MyPoint = new Point(0, 0);
        /// <summary>
        /// The title to draw
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        public string ToolTipTextTitle
        {
            get { return _toolTipTextTitle; }
            set { _toolTipTextTitle = value; }
        }

        /// <summary>
        /// Gets or sets the ToolTipText lines
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks>Don not use the add function directly on this, use ToolTipText = value</remarks>

        public List<string> ToolTipText
        {
            get
            {
                if (_toolTipText == null)
                    _toolTipText = new List<string>();
                return _toolTipText;
            }
            set
            {
                _toolTipText = value;

                Point LocalMousePosition = default(Point);

                LocalMousePosition = this.PointToClient(Cursor.Position);


                if (LocalMousePosition == MyPoint)
                    return;

                MyPoint = LocalMousePosition;

                ToolTip.SetToolTip(this, ".");
            }
        }

        /// <summary>
        /// Draws the ToolTip window
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <remarks></remarks>

        private void ToolTipText_Draw(System.Object sender, System.Windows.Forms.DrawToolTipEventArgs e)
        {
            if (ToolTipText == null)
            {
                ToolTipText = new List<string>();
                return;
            }

            if (ToolTipText.Count == 0)
            {
                return;
            }
            else if (ToolTipText[0].Length == 0)
            {
                return;
            }

            int x = 0;
            int y = 0;

            e.Graphics.FillRectangle(Brushes.AntiqueWhite, e.Bounds);
            e.DrawBorder();

            int titleHeight = 14;
            int fontHeight = 12;

            // Draws the line just below the title

            e.Graphics.DrawLine(Pens.Black, 0, titleHeight, e.Bounds.Width, titleHeight);

            int lines = 1;
            string text = ToolTipTextTitle;

            // Draws the title

            using (Font font = new Font(e.Font, FontStyle.Bold))
            {
                x = Convert.ToInt32((e.Bounds.Width - e.Graphics.MeasureString(text, font).Width) / 2);
                y = Convert.ToInt32((titleHeight - e.Graphics.MeasureString(text, font).Height) / 2);
                e.Graphics.DrawString(text, font, Brushes.Black, x, y);
            }

            // Draws the lines
            for (int i = 0; i < ToolTipText.Count; i++)
            {
                Font font = new Font(e.Font, FontStyle.Regular);

                if (ToolTipText[i].Contains("[b]"))
                {
                    font = new Font(font.FontFamily, font.Size, FontStyle.Bold, font.Unit);
                    ToolTipText[i] = ToolTipText[i].Replace("[b]", "");
                }

                using (font)
                {
                    x = 5;
                    y = Convert.ToInt32((titleHeight - fontHeight - e.Graphics.MeasureString(ToolTipText[i], font).Height) / 2 + 10 + (lines * 14));
                    e.Graphics.DrawString(ToolTipText[i], font, Brushes.Black, x, y);
                }

                lines += 1;
            }
            //foreach (string str in ToolTipText)
            //{
            //    Font font = new Font(e.Font, FontStyle.Regular);

            //    if (str.Contains("[b]"))
            //    {
            //        font = new Font(font.FontFamily, font.Size, FontStyle.Bold, font.Unit);
            //        str = str.Replace("[b]", "");
            //    }

            //    using (font)
            //    {
            //        x = 5;
            //        y = Convert.ToInt32((titleHeight - fontHeight - e.Graphics.MeasureString(str, font).Height) / 2 + 10 + (lines * 14));
            //        e.Graphics.DrawString(str, font, Brushes.Black, x, y);
            //    }

            //    lines += 1;
            //}
        }

        /// <summary>
        /// Automatically resizes the ToolTip window
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <remarks></remarks>

        private void ToolTipText_Popup(System.Object sender, System.Windows.Forms.PopupEventArgs e)
        {
            if (ToolTipText == null)
            {
                ToolTipText = new List<string>();
            }

            if (ToolTipText.Count == 0)
            {
                e.ToolTipSize = new Size(0, 0);
                return;
            }
            else if (ToolTipText[0].Length == 0)
            {
                e.ToolTipSize = new Size(0, 0);
                return;
            }

            // resizes the ToolTip window

            int height = 18 + (ToolTipText.Count * 15);
            e.ToolTipSize = new Size(200, height);
        }

        #endregion

        #region "ChartBar"

        private class ChartBarDate
        {

            internal class Location
            {

                private Point _right = new Point(0, 0);

                private Point _left = new Point(0, 0);
                public Point Right
                {
                    get { return _right; }
                    set { _right = value; }
                }

                public Point Left
                {
                    get { return _left; }
                    set { _left = value; }
                }

            }

            private System.DateTime _startValue;

            private System.DateTime _endValue;
            private Color _color;

            private Color _hoverColor;
            private string _text;

            private object _value;

            private int _rowIndex;
            private Location _topLocation = new Location();

            private Location _bottomLocation = new Location();

            private bool _hideFromMouseMove = false;
            public System.DateTime StartValue
            {
                get { return _startValue; }
                set { _startValue = value; }
            }

            public System.DateTime EndValue
            {
                get { return _endValue; }
                set { _endValue = value; }
            }

            public Color Color
            {
                get { return _color; }
                set { _color = value; }
            }

            public Color HoverColor
            {
                get { return _hoverColor; }
                set { _hoverColor = value; }
            }

            public string Text
            {
                get { return _text; }
                set { _text = value; }
            }

            public object Value
            {
                get { return _value; }
                set { _value = value; }
            }

            public int RowIndex
            {
                get { return _rowIndex; }
                set { _rowIndex = value; }
            }

            public bool HideFromMouseMove
            {
                get { return _hideFromMouseMove; }
                set { _hideFromMouseMove = value; }
            }

            internal Location TopLocation
            {
                get { return _topLocation; }
                set { _topLocation = value; }
            }

            internal Location BottomLocation
            {
                get { return _bottomLocation; }
                set { _bottomLocation = value; }
            }

        }

        #endregion

        #region "Headers"

        private class Header
        {

            private string _headerText;
            private int _startLocation;
            private string _headerTextInsteadOfTime = "";

            private System.DateTime _time;
            public string HeaderText
            {
                get { return _headerText; }
                set { _headerText = value; }
            }

            public int StartLocation
            {
                get { return _startLocation; }
                set { _startLocation = value; }
            }

            /// <summary>
            /// If this string is larger than 0, this will be used instead of Time
            /// </summary>
            /// <value></value>
            /// <returns></returns>
            /// <remarks></remarks>

            public string HeaderTextInsteadOfTime
            {
                get { return _headerTextInsteadOfTime; }
                set { _headerTextInsteadOfTime = value; }
            }

            /// <summary>
            /// Time to display
            /// </summary>
            /// <value></value>
            /// <returns></returns>
            /// <remarks></remarks>

            public System.DateTime Time
            {
                get { return _time; }
                set { _time = value; }
            }

        }

        #endregion

        #region "Resize"

        /// <summary>
        /// On resize the Gantt Chart is redrawn
        /// </summary>
        /// <param name="e"></param>
        /// <remarks></remarks>

        protected override void OnResize(System.EventArgs e)
        {
            base.OnResize(e);

            scrollPosition = 0;

            // Used for when the Gantt Chart is saved as an image

            if (lastLineStop > 0)
            {
                objBmp = new Bitmap(this.Width - barStartRight, lastLineStop, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
                objGraphics = Graphics.FromImage(objBmp);
            }

            PaintChart();
        }

        #endregion

        #region "Scrollbar"

        private int barsViewable = -1;
        private int scrollPosition = 0;
        private Rectangle topPart;
        private Rectangle BottomPart;
        private Rectangle scroll;

        private Rectangle scrollBarArea;
        private bool mouseOverTopPart = false;
        private bool mouseOverBottomPart = false;
        private bool mouseOverScrollBar = false;

        private bool mouseOverScrollBarArea = false;
        /// <summary>
        /// Draws a scrollbar to the component, if there's a need for it
        /// </summary>
        /// <param name="grfx"></param>
        /// <remarks></remarks>

        private void DrawScrollBar(Graphics grfx)
        {
            barsViewable = (this.Height - barStartTop) / (barHeight + barSpace);
            int barCount = GetIndexChartBar("QQQWWW");
            if (barCount == 0)
                return;

            int maxHeight = this.Height - 30;
            decimal scrollHeight = (maxHeight / barCount) * barsViewable;

            // If the scroll area is filled there's no need to show the scrollbar

            if (scrollHeight >= maxHeight)
                return;

            decimal scrollSpeed = (maxHeight - scrollHeight) / (barCount - barsViewable);

            scrollBarArea = new Rectangle(this.Width - 20, 19, 12, maxHeight);
            scroll = new Rectangle(this.Width - 20, 19 + Convert.ToInt32((scrollPosition * scrollSpeed)), 12, Convert.ToInt32(scrollHeight));

            topPart = new Rectangle(this.Width - 20, 10, 12, 8);
            BottomPart = new Rectangle(this.Width - 20, this.Height - 10, 12, 8);

            Brush colorTopPart = null;
            Brush colorBottomPart = null;
            Brush colorScroll = null;

            if (mouseOverTopPart == true)
            {
                colorTopPart = Brushes.Black;
            }
            else
            {
                colorTopPart = Brushes.Gray;
            }

            if (mouseOverBottomPart == true)
            {
                colorBottomPart = Brushes.Black;
            }
            else
            {
                colorBottomPart = Brushes.Gray;
            }

            if (mouseOverScrollBar == true)
            {
                colorScroll = new LinearGradientBrush(scroll, Color.Bisque, Color.Gray, LinearGradientMode.Horizontal);
            }
            else
            {
                colorScroll = new LinearGradientBrush(scroll, Color.White, Color.Gray, LinearGradientMode.Horizontal);
            }

            // Draws the top and bottom part of the scrollbar

            grfx.DrawRectangle(Pens.Black, topPart);
            grfx.FillRectangle(Brushes.LightGray, topPart);

            grfx.DrawRectangle(Pens.Black, BottomPart);
            grfx.FillRectangle(Brushes.LightGray, BottomPart);

            // Draws arrows

            PointF[] points = new PointF[3];
            points[0] = new PointF(topPart.Left, topPart.Bottom - 1);
            points[1] = new PointF(topPart.Right, topPart.Bottom - 1);
            points[2] = new PointF((topPart.Left + topPart.Right) / 2, topPart.Top + 1);

            grfx.FillPolygon(colorTopPart, points);

            points[0] = new PointF(BottomPart.Left, BottomPart.Top + 1);
            points[1] = new PointF(BottomPart.Right, BottomPart.Top + 1);
            points[2] = new PointF((BottomPart.Left + BottomPart.Right) / 2, BottomPart.Bottom - 1);

            grfx.FillPolygon(colorBottomPart, points);

            // Draws the scroll area

            grfx.DrawRectangle(Pens.Black, scrollBarArea);
            grfx.FillRectangle(Brushes.DarkGray, scrollBarArea);

            // Draws the actual scrollbar

            grfx.DrawRectangle(Pens.Black, scroll);
            grfx.FillRectangle(colorScroll, scroll);
        }

        /// <summary>
        /// The Y-position of the center of the scroll
        /// </summary>
        /// <value></value>
        /// <returns></returns>
        /// <remarks></remarks>

        private int ScrollPositionY
        {
            get
            {
                if (scroll == null)
                    return -1;
                return ((scroll.Height / 2) + scroll.Location.Y) + 19;
            }
            set
            {
                int barCount = GetIndexChartBar("QQQWWW");
                int maxHeight = this.Height - 30;
                decimal scrollHeight = (maxHeight / barCount) * barsViewable;
                decimal scrollSpeed = (maxHeight - scrollHeight) / (barCount - barsViewable);
                int index = 0;
                dynamic distanceFromLastPosition = 9999;

                // Tests to see what scrollposition is the closest to the set position

                while (index < barCount)
                {
                    int newPositionTemp = Convert.ToInt32((index * scrollSpeed) + (scrollHeight / 2) + (30 / 2));
                    dynamic distanceFromCurrentPosition = newPositionTemp - value;

                    if (distanceFromLastPosition < 0)
                    {
                        if (distanceFromCurrentPosition < distanceFromLastPosition)
                        {
                            scrollPosition = index - 1;
                            PaintChart();
                            return;
                        }
                    }
                    else
                    {
                        if (distanceFromCurrentPosition > distanceFromLastPosition)
                        {
                            scrollPosition = index - 1;

                            // A precaution to make sure the scroll bar doesn't go too far down

                            if (scrollPosition + barsViewable > GetIndexChartBar("QQQWWW"))
                            {
                                scrollPosition = GetIndexChartBar("QQQWWW") - barsViewable;
                            }

                            PaintChart();
                            return;
                        }
                    }

                    distanceFromLastPosition = distanceFromCurrentPosition;

                    index += 1;
                }
            }
        }

        /// <summary>
        /// Scrolls one row up
        /// </summary>
        /// <remarks></remarks>

        public void ScrollOneup()
        {
            if (scrollPosition == 0)
                return;

            scrollPosition -= 1;

            PaintChart();
        }

        /// <summary>
        /// Scrolls one row down
        /// </summary>
        /// <remarks></remarks>

        public void ScrollOneDown()
        {
            if (scrollPosition + barsViewable >= GetIndexChartBar("QQQWWW"))
                return;

            scrollPosition += 1;

            PaintChart();
        }

        /// <summary>
        /// If the user clicks on the scrollbar, scrolling functions will be called
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <remarks></remarks>

        private void GanttChart_Click(System.Object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                if (mouseOverBottomPart == true)
                {
                    ScrollOneDown();
                }
                else if (mouseOverTopPart == true)
                {
                    ScrollOneup();
                }
            }
        }

        /// <summary>
        /// When mousewheel is used, the scrollbar will scroll
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        /// <remarks></remarks>

        private void GanttChart_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if (e.Delta > 0)
            {
                ScrollOneup();
            }
            else
            {
                ScrollOneDown();
            }
        }

        #endregion

        #region "Save"

        /// <summary>
        /// Saves the GanttChart to specified image file
        /// </summary>
        /// <param name="filePath"></param>
        /// <remarks></remarks>

        public void SaveImage(string filePath)
        {
            objGraphics.SmoothingMode = SmoothingMode.HighSpeed;
            objGraphics.Clear(this.BackColor);

            if (headerFromDate == null | headerToDate == null)
                return;

            DrawHeader(objGraphics, null);
            DrawNetHorizontal(objGraphics);
            DrawNetVertical(objGraphics);
            DrawBars(objGraphics, true);

            objBmp.Save(filePath);
        }

        #endregion

        private enum MouseOverPart
        {

            Empty,
            Bar,
            BarLeftSide,
            BarRightSide

        }

    }