Imports System.Drawing.Drawing2D
''' <summary>
''' Adds an easy to use Gantt Chart to your application
''' Created by Adrian "Adagio" Grau
''' Version 0.55
''' </summary>
''' <remarks></remarks>
Public Class GanttChart
    Inherits Control
    Private mouseHoverPart As MouseOverPart = MouseOverPart.Empty : Private mouseHoverBarIndex As Integer = -1 : Private bars As New List(Of ChartBarDate)
    Private headerFromDate As Date = Nothing : Private headerToDate As Date = Nothing : Private barIsChanging As Integer = -1
    Private ReadOnly barStartRight As Integer = 20 : Private barStartLeft As Integer = 100 : Private ReadOnly headerTimeStartTop As Integer = 30
    Private shownHeaderList As List(Of Header) : Private ReadOnly barStartTop As Integer = 50 : Private ReadOnly barHeight As Integer = 35
    Private ReadOnly barSpace As Integer = 5 : Private widthPerItem As Integer : Private _mouseOverColumnValue As Date = Nothing
    Private _mouseOverRowText As String = "" : Private _mouseOverRowValue As Object = Nothing : Private lineColor As Pen = Pens.Bisque
    Private dateTextFont As Font = New Font("VERDANA", 8.0, FontStyle.Regular, GraphicsUnit.Point) : Private timeTextFont As Font = New Font("VERDANA", 8.0, FontStyle.Regular, GraphicsUnit.Point)
    Private rowTextFont As Font = New Font("VERDANA", 8.0, FontStyle.Regular, GraphicsUnit.Point) : Friend WithEvents ToolTip As New System.Windows.Forms.ToolTip()
    Private _allowEditBarWithMouse As Boolean = False : Public Event MouseDragged(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs)
    Public Event BarChanged(ByVal sender As Object, ByRef barValue As Object)
    Private objBmp As Bitmap
    Private objGraphics As Graphics
#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 Property AllowManualEditBar() As Boolean
        Get
            Return _allowEditBarWithMouse
        End Get
        Set(ByVal value As Boolean)
            _allowEditBarWithMouse = value
        End Set
    End Property
    ''' <summary>
    ''' The start date/time of the chart
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Property FromDate() As Date
        Get
            Return headerFromDate
        End Get
        Set(ByVal value As Date)
            headerFromDate = value
        End Set
    End Property
    ''' <summary>
    ''' The end date/time of the chart
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Property ToDate() As Date
        Get
            Return headerToDate
        End Get
        Set(ByVal value As Date)
            headerToDate = value
        End Set
    End Property
    ''' <summary>
    ''' The text for the current row the mouse hovers above
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public ReadOnly Property MouseOverRowText() As String
        Get
            Return _mouseOverRowText
        End Get
    End Property
    ''' <summary>
    ''' The value for the current bar the mouse hovers above
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public ReadOnly Property MouseOverRowValue() As Object
        Get
            Return _mouseOverRowValue
        End Get
    End Property
    ''' <summary>
    ''' The date/time the mouse hovers above
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public ReadOnly Property MouseOverColumnDate() As Date
        Get
            Return _mouseOverColumnValue
        End Get
    End Property
    ''' <summary>
    ''' The color of the grid
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Property GridColor() As System.Drawing.Pen
        Get
            Return lineColor
        End Get
        Set(ByVal value As System.Drawing.Pen)
            lineColor = value
        End Set
    End Property
    ''' <summary>
    ''' The font used for the row text
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Property RowFont() As Font
        Get
            Return rowTextFont
        End Get
        Set(ByVal value As Font)
            rowTextFont = value
        End Set
    End Property
    ''' <summary>
    ''' The font used for the "date" text in the columns
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Property DateFont() As Font
        Get
            Return dateTextFont
        End Get
        Set(ByVal value As Font)
            dateTextFont = value
        End Set
    End Property
    ''' <summary>
    ''' The font used for the "time" text in the colums)
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Property TimeFont() As Font
        Get
            Return timeTextFont
        End Get
        Set(ByVal value As Font)
            timeTextFont = value
        End Set
    End Property
#End Region
#Region "Constructor"
    ''' <summary>
    ''' Default constructor
    ''' </summary>
    ''' <remarks></remarks>
    Public Sub New()
        ToolTip.AutoPopDelay = 15000 : ToolTip.InitialDelay = 250 : ToolTip.OwnerDraw = True
        objBmp = New Bitmap(1280, 1024, Imaging.PixelFormat.Format24bppRgb) : objGraphics = Graphics.FromImage(objBmp)
        ' Flicker free drawing
        Me.SetStyle(ControlStyles.DoubleBuffer Or ControlStyles.UserPaint Or ControlStyles.AllPaintingInWmPaint, True)
    End Sub
#End Region
#Region "Bars"
    Private Sub SetBarStartLeft(ByVal rowText As String)
        Dim gfx As Graphics = Me.CreateGraphics
        Dim length As Integer = gfx.MeasureString(rowText, rowTextFont, 500).Width
        If length > barStartLeft Then : barStartLeft = length : End If
    End Sub
    ''' <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 Sub AddChartBar(ByVal rowText As String, ByVal barValue As Object, ByVal fromTime As Date, ByVal toTime As Date,
                           ByVal color As Color, ByVal hoverColor As Color, ByVal rowIndex As Integer)
        Dim bar As New ChartBarDate With {
            .Text = rowText,
            .Value = barValue,
            .StartValue = fromTime,
            .EndValue = toTime,
            .Color = color,
            .HoverColor = hoverColor,
            .RowIndex = rowIndex
            } : bars.Add(bar) : SetBarStartLeft(rowText)
    End Sub
    ''' <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 Sub AddChartBar(ByVal rowText As String, ByVal barValue As Object, ByVal fromTime As Date, ByVal toTime As Date, ByVal color As Color,
                           ByVal hoverColor As Color, ByVal rowIndex As Integer, ByVal hideFromMouseMove As Boolean)
        Dim bar As New ChartBarDate With {
            .Text = rowText,
            .Value = barValue,
            .StartValue = fromTime,
            .EndValue = toTime,
            .Color = color,
            .HoverColor = hoverColor,
            .RowIndex = rowIndex,
            .HideFromMouseMove = hideFromMouseMove
            } : bars.Add(bar) : SetBarStartLeft(rowText)
    End Sub
    ''' <summary>
    ''' Gets the next index
    ''' </summary>
    ''' <param name="rowText"></param>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Function GetIndexChartBar(ByVal rowText As String) As Integer
        Dim index As Integer = -1
        For Each bar As ChartBarDate In bars : If bar.Text.Equals(rowText) = True Then : Return bar.RowIndex : End If : If bar.RowIndex > index Then : index = bar.RowIndex : End If : Next
        Return index + 1
    End Function
    ''' <summary>
    ''' Removes all bars from list
    ''' </summary>
    ''' <remarks></remarks>
    Public Sub RemoveBars()
        bars = New List(Of ChartBarDate) : barStartLeft = 100
    End Sub
#End Region
#Region "Draw"
    ''' <summary>
    ''' Redraws the Gantt chart
    ''' </summary>
    ''' <remarks></remarks>
    Public Sub PaintChart()
        Me.Invalidate()
    End Sub
    ''' <summary>
    ''' Redraws the Gantt chart
    ''' </summary>
    ''' <param name="gfx"></param>
    ''' <remarks></remarks>
    Private Sub PaintChart(ByVal gfx As Graphics)
        Try
            gfx.Clear(Me.BackColor) : If headerFromDate = Nothing Or headerToDate = Nothing Then Exit Sub
            DrawScrollBar(gfx) : DrawHeader(gfx, Nothing) : DrawNetHorizontal(gfx) : DrawNetVertical(gfx) : DrawBars(gfx)
            objBmp = New Bitmap(Me.Width - barStartRight, lastLineStop, Imaging.PixelFormat.Format24bppRgb)
            objGraphics = Graphics.FromImage(objBmp)
        Catch ex As Exception
        End Try
    End Sub
    ''' <summary>
    ''' Redraws the Gantt chart
    ''' </summary>
    ''' <param name="pe"></param>
    ''' <remarks></remarks>
    Protected Overrides Sub OnPaint(ByVal pe As System.Windows.Forms.PaintEventArgs)
        MyBase.OnPaint(pe) : PaintChart(pe.Graphics)
    End Sub
    ''' <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 Sub DrawHeader(ByVal gfx As Graphics, ByVal headerList As List(Of Header))
        If headerList Is Nothing Then : headerList = GetFullHeaderList() : End If
        If headerList.Count = 0 Then Exit Sub
        Dim availableWidth = Me.Width - 10 - barStartLeft - barStartRight : widthPerItem = availableWidth / headerList.Count
        If widthPerItem < 40 Then
            Dim newHeaderList As New List(Of Header) : Dim showNext As Boolean = True
            ' If there's not enough room for all headers remove 50%
            For Each header As Header In headerList : If showNext = True Then : newHeaderList.Add(header) : showNext = False : Else : showNext = True : End If : Next
            DrawHeader(gfx, newHeaderList) : Exit Sub
        End If
        Dim index As Integer = 0 : Dim lastHeader As Header = Nothing ': Dim headerStartPosition As Integer = -1
        For Each header As Header In headerList
            Dim startPos As Integer = barStartLeft + (index * widthPerItem) : Dim showDateHeader As Boolean = False : header.StartLocation = startPos
            ' Checks whether to show the date or not
            If lastHeader Is Nothing Then : showDateHeader = True
            ElseIf header.Time.Hour < lastHeader.Time.Hour Then : showDateHeader = True
            ElseIf header.Time.Minute = lastHeader.Time.Minute Then : showDateHeader = True : End If
            ' Show date
            If showDateHeader = True Then
                Dim str As String = ""
                If header.HeaderTextInsteadOfTime.Length > 0 Then : str = header.HeaderTextInsteadOfTime
                Else : str = header.Time.ToString("d-MMM") : End If : gfx.DrawString(str, dateTextFont, Brushes.Black, startPos, 0)
            End If
            ' Show time
            gfx.DrawString(header.HeaderText, timeTextFont, Brushes.Black, startPos, headerTimeStartTop) : index += 1 : lastHeader = header
        Next
        shownHeaderList = headerList : widthPerItem = (Me.Width - 10 - barStartLeft - barStartRight) / shownHeaderList.Count
    End Sub
    ''' <summary>
    ''' Draws the bars
    ''' </summary>
    ''' <param name="grfx"></param>
    ''' <remarks></remarks>
    Private Sub DrawBars(ByVal grfx As Graphics, Optional ByVal ignoreScrollAndMousePosition As Boolean = False)
        If shownHeaderList Is Nothing Then Exit Sub : If shownHeaderList.Count = 0 Then Exit Sub
        Dim index As Integer
        ' Finds pixels per minute
        Dim timeBetween As TimeSpan = shownHeaderList(1).Time - shownHeaderList(0).Time
        Dim minutesBetween As Integer = CInt(timeBetween.TotalMinutes) '(timeBetween.Days * 1440) + (timeBetween.Hours * 60) + timeBetween.Minutes
        Dim widthBetween = (shownHeaderList(1).StartLocation - shownHeaderList(0).StartLocation) : Dim perMinute As Decimal = widthBetween / minutesBetween
        ' Draws each bar
        For Each bar As ChartBarDate In bars
            index = bar.RowIndex : Dim startLocation As Integer : Dim width As Integer : Dim startMinutes As Integer ' Number of minutes from start of the gantt chart
            Dim startTimeSpan As TimeSpan : Dim lengthMinutes As Integer ' Number of minutes from bar start to bar end
            Dim lengthTimeSpan As TimeSpan : Dim scrollPos As Integer = 0
            If ignoreScrollAndMousePosition = False Then : scrollPos = scrollPosition : End If
            ' Calculates where the bar should be located
            startTimeSpan = bar.StartValue - FromDate : startMinutes = (startTimeSpan.Days * 1440) + (startTimeSpan.Hours * 60) + startTimeSpan.Minutes
            startLocation = perMinute * startMinutes : Dim endValue As Date = bar.EndValue
            If endValue = Nothing Then : endValue = Date.Now : End If
            lengthTimeSpan = endValue - bar.StartValue : lengthMinutes = (lengthTimeSpan.Days * 1440) + (lengthTimeSpan.Hours * 60) + lengthTimeSpan.Minutes
            width = perMinute * lengthMinutes
            Dim a As Integer = barStartLeft + startLocation : Dim b As Integer = barStartTop + (barHeight * (index - scrollPos)) + (barSpace * (index - scrollPos)) + 2
            Dim c As Integer = width : Dim d As Integer = barHeight
            If c = 0 Then c = 1              ' Stops a bar from going into the row-text area
            If a - barStartLeft < 0 Then : a = barStartLeft : End If
            Dim color As System.Drawing.Color
            ' If mouse is over bar, set the color to be hovercolor
            If MouseOverRowText = bar.Text And bar.StartValue <= _mouseOverColumnValue And bar.EndValue >= _mouseOverColumnValue Then
                color = bar.HoverColor : Else : color = bar.Color : End If
            ' 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)
            Dim obBrush As LinearGradientBrush : Dim obRect As New Rectangle(a, b, c, d)
            If bar.StartValue <> Nothing And endValue <> Nothing Then
                If (index >= scrollPos And index < barsViewable + scrollPos) Or ignoreScrollAndMousePosition = True Then          ' 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 = Nothing : obRect = Nothing : obBrush = Nothing
                End If
            End If : color = Nothing
        Next
    End Sub
    ''' <summary>
    ''' Draws the vertical lines
    ''' </summary>
    ''' <param name="grfx"></param>
    ''' <remarks></remarks>
    Public Sub DrawNetVertical(ByVal grfx As Graphics)
        If shownHeaderList Is Nothing Then Exit Sub : If shownHeaderList.Count = 0 Then Exit Sub
        Dim index As Integer = 0 : Dim availableWidth As Integer = Me.Width - 10 - barStartLeft - barStartRight : Dim lastHeader As Header = Nothing
        For Each header As Header In shownHeaderList
            Dim headerLocationY As Integer = 0
            If lastHeader Is Nothing Then : headerLocationY = 0 : ElseIf header.Time.Hour < lastHeader.Time.Hour Then : headerLocationY = 0 : Else : headerLocationY = headerTimeStartTop : End If
            grfx.DrawLine(Pens.Bisque, barStartLeft + (index * widthPerItem), headerLocationY, barStartLeft + (index * widthPerItem), lastLineStop) : index += 1 : lastHeader = header
        Next
        grfx.DrawLine(lineColor, barStartLeft + (index * widthPerItem), headerTimeStartTop, barStartLeft + (index * widthPerItem), lastLineStop)
    End Sub
    ''' <summary>
    ''' Draws the horizontal lines
    ''' </summary>
    ''' <param name="grfx"></param>
    ''' <remarks></remarks>
    Public Sub DrawNetHorizontal(ByVal grfx As Graphics)
        If shownHeaderList Is Nothing Then Exit Sub : If shownHeaderList.Count = 0 Then Exit Sub
        Dim index As Integer : Dim width As Integer = (widthPerItem * shownHeaderList.Count) + barStartLeft
        For index = 0 To GetIndexChartBar("QQQQQQ") ' Last used index. Hopefully nobody will make a row named QQQ :o)
            For Each bar As ChartBarDate In bars
                grfx.DrawLine(lineColor, 0, barStartTop + (barHeight * index) + (barSpace * index), width, barStartTop + (barHeight * index) + (barSpace * index))
            Next
        Next : lastLineStop = barStartTop + (barHeight * (index - 1)) + (barSpace * (index - 1))
    End Sub     ' This is the position (in pixels, from top) of the last line. Used for drawing lines
    Private lastLineStop As Integer = 0
#End Region
#Region "Header list"
    ''' <summary>
    ''' Gets the full header list, consisting of hours between the two dates set
    ''' </summary>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Private Function GetFullHeaderList() As List(Of Header)
        Dim result As New List(Of Header) : Dim newFromTime As New Date(FromDate.Year, FromDate.Month, FromDate.Day) : Dim item As String : Dim interval As TimeSpan = ToDate - FromDate
        If interval.TotalDays < 1 Then
            With newFromTime
                newFromTime = .AddHours(FromDate.Hour)
                If headerFromDate.Minute < 59 And headerFromDate.Minute > 29 Then : newFromTime = .AddMinutes(30) : Else : newFromTime = .AddMinutes(0) : End If
            End With
            While newFromTime <= ToDate
                item = newFromTime.Hour & ":" : If newFromTime.Minute < 10 Then : item += "0" & newFromTime.Minute : Else : item += "" & newFromTime.Minute : End If

                Dim header As New Header With {
                    .HeaderText = item,
                    .HeaderTextInsteadOfTime = "",
                    .Time = New Date(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
            End While
        ElseIf interval.TotalDays < 60 Then
            While newFromTime <= ToDate
                Dim header As New Header With {
                    .HeaderText = "",
                    .HeaderTextInsteadOfTime = "",
                    .Time = New Date(newFromTime.Year, newFromTime.Month, newFromTime.Day, 0, 0, 0)
                } : result.Add(header) : newFromTime = newFromTime.AddDays(1) ' The minimum interval of time between the headers
            End While
        Else
            While newFromTime <= ToDate
                Dim header As New Header With {
                    .HeaderText = "",
                    .Time = New Date(newFromTime.Year, newFromTime.Month, newFromTime.Day, 0, 0, 0),
                    .HeaderTextInsteadOfTime = newFromTime.ToString("MMM")
                    } : result.Add(header) : newFromTime = newFromTime.AddMonths(1) ' The minimum interval of time between the headers
            End While
        End If : Return result
    End Function

#End Region

#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 Sub GanttChart_MouseMove(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove
        If shownHeaderList Is Nothing Then Exit Sub : If shownHeaderList.Count = 0 Then Exit Sub
        If e.Button <> Windows.Forms.MouseButtons.Left Then : 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 Then : If barIsChanging >= 0 Then : RaiseEvent BarChanged(Me, bars(barIsChanging).Value) : barIsChanging = -1 : End If : End If
        End If
        mouseHoverBarIndex = -1 : Dim LocalMousePosition As Point
        LocalMousePosition = Me.PointToClient(Cursor.Position)         ' Finds pixels per minute
        Dim timeBetween As TimeSpan = shownHeaderList(1).Time - shownHeaderList(0).Time : Dim minutesBetween As Integer = (timeBetween.Days * 1440) + (timeBetween.Hours * 60) + timeBetween.Minutes
        Dim widthBetween = (shownHeaderList(1).StartLocation - shownHeaderList(0).StartLocation) : Dim perMinute As Decimal = widthBetween / minutesBetween
        ' Finds the time at mousepointer
        Dim minutesAtCursor As Integer
        If LocalMousePosition.X > barStartLeft Then : minutesAtCursor = (LocalMousePosition.X - barStartLeft) / perMinute : _mouseOverColumnValue = FromDate.AddMinutes(minutesAtCursor)
        Else : _mouseOverColumnValue = Nothing : End If         ' Finds the row at mousepointer
        Dim rowText As String = "" : Dim rowValue As Object = Nothing ': Dim columnText As String       ' Tests to see if the mouse pointer is hovering above the scrollbar
        Dim scrollBarStatusChanged As Boolean = False         ' Tests to see if the mouse is hovering over the scroll-area bottom-arrow
        If LocalMousePosition.X > BottomPart.Left And LocalMousePosition.Y < BottomPart.Right And LocalMousePosition.Y < BottomPart.Bottom And LocalMousePosition.Y > BottomPart.Top Then
            If mouseOverBottomPart = False Then : scrollBarStatusChanged = True : End If : mouseOverBottomPart = True
        Else : If mouseOverBottomPart = False Then : scrollBarStatusChanged = True : End If : mouseOverBottomPart = False : End If
        ' Tests to see if the mouse is hovering over the scroll-area top-arrow
        If LocalMousePosition.X > topPart.Left And LocalMousePosition.Y < topPart.Right And LocalMousePosition.Y < topPart.Bottom And LocalMousePosition.Y > topPart.Top Then
            If mouseOverTopPart = False Then : scrollBarStatusChanged = True : End If : mouseOverTopPart = True
        Else : If mouseOverTopPart = False Then : scrollBarStatusChanged = True : End If : mouseOverTopPart = False : End If
        ' Tests to see if the mouse is hovering over the scroll
        If LocalMousePosition.X > scroll.Left And LocalMousePosition.Y < scroll.Right And LocalMousePosition.Y < scroll.Bottom And LocalMousePosition.Y > scroll.Top Then
            If mouseOverScrollBar = False Then : scrollBarStatusChanged = True : End If : mouseOverScrollBar = True : mouseOverScrollBarArea = True
        Else
            If mouseOverScrollBar = False Then : scrollBarStatusChanged = True : End If : mouseOverScrollBar = False : mouseOverScrollBarArea = False
        End If
        ' 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 Then
            If LocalMousePosition.X > scrollBarArea.Left And LocalMousePosition.Y < scrollBarArea.Right And LocalMousePosition.Y < scrollBarArea.Bottom And LocalMousePosition.Y > scrollBarArea.Top Then
                mouseOverScrollBarArea = True
            End If
        End If         ' Tests to see if the mouse pointer is hovering above a bar
        Dim index As Integer = 0
        For Each bar As ChartBarDate In bars
            ' If the bar is set to be hidden from mouse move, the current bar will be ignored
            If bar.HideFromMouseMove = False Then
                If bar.EndValue = Nothing Then : bar.EndValue = Date.Now : End If
                ' Mouse pointer needs to be inside the X and Y positions of the bar
                If LocalMousePosition.Y > bar.TopLocation.Left.Y And LocalMousePosition.Y < bar.BottomLocation.Left.Y Then
                    If LocalMousePosition.X > bar.TopLocation.Left.X And LocalMousePosition.X < bar.TopLocation.Right.X Then
                        ' 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 And mouseHoverPart <> MouseOverPart.BarRightSide Then : mouseHoverPart = MouseOverPart.Bar : End If
                    End If
                    ' If mouse pointer is near the edges of the bar it will open up for editing the bar
                    If AllowManualEditBar = True Then
                        Dim areaSize As Integer = 5 : If e.Button = Windows.Forms.MouseButtons.Left Then : areaSize = 50 : End If
                        If LocalMousePosition.X > bar.TopLocation.Left.X - areaSize And LocalMousePosition.X < bar.TopLocation.Left.X + areaSize And mouseHoverPart <> MouseOverPart.BarRightSide Then
                            Me.Cursor = Cursors.VSplit : mouseHoverPart = MouseOverPart.BarLeftSide : mouseHoverBarIndex = index
                        ElseIf LocalMousePosition.X > bar.TopLocation.Right.X - areaSize And LocalMousePosition.X < bar.TopLocation.Right.X + areaSize And mouseHoverPart <> MouseOverPart.BarLeftSide Then
                            Me.Cursor = Cursors.VSplit : mouseHoverPart = MouseOverPart.BarRightSide : mouseHoverBarIndex = index
                        Else : Me.Cursor = Cursors.Default : End If
                    End If
                End If
            End If : index += 1
        Next         ' Sets the mouseover row value and text
        _mouseOverRowText = rowText : _mouseOverRowValue = rowValue
        If e.Button = Windows.Forms.MouseButtons.Left Then : RaiseEvent 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 Is Nothing And Not rowValue Is Nothing) Or (Not _mouseOverRowValue Is Nothing And rowValue Is Nothing) Or scrollBarStatusChanged = True Then : PaintChart() : End If
        End If
    End Sub
    ''' <summary>
    ''' Mouse leave event
    ''' </summary>
    ''' <param name="sender"></param>
    ''' <param name="e"></param>
    ''' <remarks></remarks>
    Private Sub GanttChart_MouseLeave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.MouseLeave
        _mouseOverRowText = Nothing : _mouseOverRowValue = Nothing : mouseHoverPart = MouseOverPart.Empty : PaintChart()
    End Sub
    ''' <summary>
    ''' Mouse drag event
    ''' </summary>
    ''' <param name="sender"></param>
    ''' <param name="e"></param>
    ''' <remarks></remarks>
    Public Sub GanttChart_MouseDragged(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDragged
        If mouseOverScrollBarArea = True Then : ScrollPositionY = e.Location.Y : End If
        If AllowManualEditBar = True Then
            If mouseHoverBarIndex > -1 Then
                If mouseHoverPart = MouseOverPart.BarLeftSide Then : barIsChanging = mouseHoverBarIndex : bars(mouseHoverBarIndex).StartValue = _mouseOverColumnValue : PaintChart()
                ElseIf mouseHoverPart = MouseOverPart.BarRightSide Then : barIsChanging = mouseHoverBarIndex : bars(mouseHoverBarIndex).EndValue = _mouseOverColumnValue : PaintChart() : End If
            End If
        End If
    End Sub
#End Region
#Region "ToolTipText"
    Private _toolTipText As New List(Of String) : Private _toolTipTextTitle As String = "" : Private MyPoint As New Point(0, 0)
    ''' <summary>
    ''' The title to draw
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Public Property ToolTipTextTitle() As String
        Get
            Return _toolTipTextTitle
        End Get
        Set(ByVal value As String)
            _toolTipTextTitle = value
        End Set
    End Property
    ''' <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 Property ToolTipText() As List(Of String)
        Get
            If _toolTipText Is Nothing Then _toolTipText = New List(Of String) : 
            Return _toolTipText
        End Get
        Set(ByVal value As List(Of String))
            _toolTipText = value : Dim LocalMousePosition As Point : LocalMousePosition = Me.PointToClient(Cursor.Position)
            If LocalMousePosition = MyPoint Then Exit Property : MyPoint = LocalMousePosition : ToolTip.SetToolTip(Me, ".")
        End Set
    End Property
    ''' <summary>
    ''' Draws the ToolTip window
    ''' </summary>
    ''' <param name="sender"></param>
    ''' <param name="e"></param>
    ''' <remarks></remarks>
    Private Sub ToolTipText_Draw(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawToolTipEventArgs) Handles ToolTip.Draw
        If ToolTipText Is Nothing Then : ToolTipText = New List(Of String) : Exit Sub : End If
        If ToolTipText.Count = 0 Then : Exit Sub : ElseIf ToolTipText(0).Length = 0 Then : Exit Sub : End If
        Dim x As Integer : Dim y As Integer
        e.Graphics.FillRectangle(Brushes.AntiqueWhite, e.Bounds) : e.DrawBorder()
        Dim titleHeight As Integer = 14 : Dim fontHeight As Integer = 12
        ' Draws the line just below the title
        e.Graphics.DrawLine(Pens.Black, 0, titleHeight, e.Bounds.Width, titleHeight)
        Dim lines As Integer = 1 : Dim text As String = ToolTipTextTitle        ' Draws the title
        Using font As New Font(e.Font, FontStyle.Bold)
            x = (e.Bounds.Width - e.Graphics.MeasureString(text, font).Width) \ 2 : y = (titleHeight - e.Graphics.MeasureString(text, font).Height) \ 2
            e.Graphics.DrawString(text, font, Brushes.Black, x, y)
        End Using    ' Draws the lines
        For Each str As String In ToolTipText
            Dim font As New Font(e.Font, FontStyle.Regular)
            If str.Contains("[b]") Then : font = New Font(font.FontFamily, font.Size, FontStyle.Bold, font.Unit) : str = str.Replace("[b]", "") : End If
            Using font
                x = 5 : y = (titleHeight - fontHeight - e.Graphics.MeasureString(str, font).Height) \ 2 + 10 + (lines * 14) : e.Graphics.DrawString(str, font, Brushes.Black, x, y)
            End Using : lines += 1
        Next
    End Sub
    ''' <summary>
    ''' Automatically resizes the ToolTip window
    ''' </summary>
    ''' <param name="sender"></param>
    ''' <param name="e"></param>
    ''' <remarks></remarks>
    Private Sub ToolTipText_Popup(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PopupEventArgs) Handles ToolTip.Popup
        If ToolTipText Is Nothing Then : ToolTipText = New List(Of String) : End If
        If ToolTipText.Count = 0 Then : e.ToolTipSize = New Size(0, 0) : Exit Sub
        ElseIf ToolTipText(0).Length = 0 Then : e.ToolTipSize = New Size(0, 0) : Exit Sub : End If      ' resizes the ToolTip window
        Dim height As Integer = 18 + (ToolTipText.Count * 15) : e.ToolTipSize = New Size(200, height)
    End Sub
#End Region
#Region "ChartBar"
    Private Class ChartBarDate
        Friend Class Location
            Private _right As New Point(0, 0) : Private _left As New Point(0, 0)
            Public Property Right() As Point
                Get
                    Return _right
                End Get
                Set(ByVal value As Point)
                    _right = value
                End Set
            End Property
            Public Property Left() As Point
                Get
                    Return _left
                End Get
                Set(ByVal value As Point)
                    _left = value
                End Set
            End Property
        End Class
        Private _startValue As Date : Private _endValue As Date : Private _color As Color : Private _hoverColor As Color : Private _text As String
        Private _value As Object : Private _rowIndex As Integer : Private _topLocation As New Location : Private _bottomLocation As New Location
        Private _hideFromMouseMove As Boolean = False
        Public Property StartValue() As Date
            Get
                Return _startValue
            End Get
            Set(ByVal value As Date)
                _startValue = value
            End Set
        End Property
        Public Property EndValue() As Date
            Get
                Return _endValue
            End Get
            Set(ByVal value As Date)
                _endValue = value
            End Set
        End Property
        Public Property Color() As Color
            Get
                Return _color
            End Get
            Set(ByVal value As Color)
                _color = value
            End Set
        End Property
        Public Property HoverColor() As Color
            Get
                Return _hoverColor
            End Get
            Set(ByVal value As Color)
                _hoverColor = value
            End Set
        End Property
        Public Property Text() As String
            Get
                Return _text
            End Get
            Set(ByVal value As String)
                _text = value
            End Set
        End Property
        Public Property Value() As Object
            Get
                Return _value
            End Get
            Set(ByVal value As Object)
                _value = value
            End Set
        End Property
        Public Property RowIndex() As Integer
            Get
                Return _rowIndex
            End Get
            Set(ByVal value As Integer)
                _rowIndex = value
            End Set
        End Property
        Public Property HideFromMouseMove() As Boolean
            Get
                Return _hideFromMouseMove
            End Get
            Set(ByVal value As Boolean)
                _hideFromMouseMove = value
            End Set
        End Property
        Friend Property TopLocation() As Location
            Get
                Return _topLocation
            End Get
            Set(ByVal value As Location)
                _topLocation = value
            End Set
        End Property
        Friend Property BottomLocation() As Location
            Get
                Return _bottomLocation
            End Get
            Set(ByVal value As Location)
                _bottomLocation = value
            End Set
        End Property
    End Class
#End Region
#Region "Headers"
    Private Class Header
        Private _headerText As String
        Private _startLocation As Integer
        Private _headerTextInsteadOfTime As String = ""
        Private _time As Date = Nothing
        Public Property HeaderText() As String
            Get
                Return _headerText
            End Get
            Set(ByVal value As String)
                _headerText = value
            End Set
        End Property
        Public Property StartLocation() As Integer
            Get
                Return _startLocation
            End Get
            Set(ByVal value As Integer)
                _startLocation = value
            End Set
        End Property
        ''' <summary>
        ''' If this string is larger than 0, this will be used instead of Time
        ''' </summary>
        ''' <value></value>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Public Property HeaderTextInsteadOfTime() As String
            Get
                Return _headerTextInsteadOfTime
            End Get
            Set(ByVal value As String)
                _headerTextInsteadOfTime = value
            End Set
        End Property
        ''' <summary>
        ''' Time to display
        ''' </summary>
        ''' <value></value>
        ''' <returns></returns>
        ''' <remarks></remarks>
        Public Property Time() As Date
            Get
                Return _time
            End Get
            Set(ByVal value As Date)
                _time = value
            End Set
        End Property
    End Class
#End Region
#Region "Resize"
    ''' <summary>
    ''' On resize the Gantt Chart is redrawn
    ''' </summary>
    ''' <param name="e"></param>
    ''' <remarks></remarks>
    Protected Overrides Sub OnResize(ByVal e As System.EventArgs)
        Try
            MyBase.OnResize(e) : scrollPosition = 0        ' Used for when the Gantt Chart is saved as an image
            If lastLineStop > 0 Then : objBmp = New Bitmap(Me.Width - barStartRight, lastLineStop, Imaging.PixelFormat.Format32bppRgb) : objGraphics = Graphics.FromImage(objBmp) : End If
            PaintChart()
        Catch ex As Exception
        End Try
    End Sub
#End Region
#Region "Scrollbar"
    Private barsViewable As Integer = -1 : Private scrollPosition As Integer = 0 : Private topPart As Rectangle = Nothing : Private BottomPart As Rectangle = Nothing
    Private scroll As Rectangle = Nothing : Private scrollBarArea As Rectangle = Nothing : Private mouseOverTopPart As Boolean = False
    Private mouseOverBottomPart As Boolean = False : Private mouseOverScrollBar As Boolean = False : Private mouseOverScrollBarArea As Boolean = False
    ''' <summary>
    ''' Draws a scrollbar to the component, if there's a need for it
    ''' </summary>
    ''' <param name="grfx"></param>
    ''' <remarks></remarks>
    Private Sub DrawScrollBar(ByVal grfx As Graphics)
        barsViewable = (Me.Height - barStartTop) / (barHeight + barSpace) : Dim barCount As Integer = GetIndexChartBar("QQQWWW")
        If barCount = 0 Then Exit Sub
        Dim maxHeight As Integer = Me.Height - 30 : Dim scrollHeight As Decimal = (maxHeight / barCount) * barsViewable
        ' If the scroll area is filled there's no need to show the scrollbar
        If scrollHeight >= maxHeight Then Exit Sub
        Dim scrollSpeed As Decimal = (maxHeight - scrollHeight) / (barCount - barsViewable) : scrollBarArea = New Rectangle(Me.Width - 20, 19, 12, maxHeight)
        scroll = New Rectangle(Me.Width - 20, 19 + (scrollPosition * scrollSpeed), 12, scrollHeight)
        topPart = New Rectangle(Me.Width - 20, 10, 12, 8) : BottomPart = New Rectangle(Me.Width - 20, Me.Height - 10, 12, 8)
        Dim colorTopPart As Brush : Dim colorBottomPart As Brush : Dim colorScroll As Brush
        If mouseOverTopPart = True Then : colorTopPart = Brushes.Black : Else : colorTopPart = Brushes.Gray : End If
        If mouseOverBottomPart = True Then : colorBottomPart = Brushes.Black : Else : colorBottomPart = Brushes.Gray : End If
        If mouseOverScrollBar = True Then : colorScroll = New LinearGradientBrush(scroll, Color.Bisque, Color.Gray, LinearGradientMode.Horizontal)
        Else : colorScroll = New LinearGradientBrush(scroll, Color.White, Color.Gray, LinearGradientMode.Horizontal) : End If         ' 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
        Dim points(2) As PointF : 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)
    End Sub
    ''' <summary>
    ''' The Y-position of the center of the scroll
    ''' </summary>
    ''' <value></value>
    ''' <returns></returns>
    ''' <remarks></remarks>
    Private Property ScrollPositionY() As Integer
        Get
            If scroll = Nothing Then Return -1 : 
            Return ((scroll.Height / 2) + scroll.Location.Y) + 19
        End Get
        Set(ByVal value As Integer)
            Dim barCount As Integer = GetIndexChartBar("QQQWWW") : Dim maxHeight As Integer = Me.Height - 30
            Dim scrollHeight As Decimal = (maxHeight / barCount) * barsViewable : Dim scrollSpeed As Decimal = (maxHeight - scrollHeight) / (barCount - barsViewable)
            Dim index As Integer = 0 : Dim distanceFromLastPosition = 9999           ' Tests to see what scrollposition is the closest to the set position
            While index < barCount
                Dim newPositionTemp As Integer = (index * scrollSpeed) + (scrollHeight / 2) + (30 / 2) : Dim distanceFromCurrentPosition = newPositionTemp - value
                If distanceFromLastPosition < 0 Then
                    If distanceFromCurrentPosition < distanceFromLastPosition Then : scrollPosition = index - 1 : PaintChart() : Exit Property : End If
                Else
                    If distanceFromCurrentPosition > distanceFromLastPosition Then : scrollPosition = index - 1 ' A precaution to make sure the scroll bar doesn't go too far down
                        If scrollPosition + barsViewable > GetIndexChartBar("QQQWWW") Then : scrollPosition = GetIndexChartBar("QQQWWW") - barsViewable : End If
                        PaintChart() : Exit Property
                    End If
                End If : distanceFromLastPosition = distanceFromCurrentPosition : index += 1
            End While
        End Set
    End Property
    ''' <summary>
    ''' Scrolls one row up
    ''' </summary>
    ''' <remarks></remarks>
    Public Sub ScrollOneup()
        If scrollPosition = 0 Then Exit Sub : scrollPosition -= 1 : PaintChart()
    End Sub
    ''' <summary>
    ''' Scrolls one row down
    ''' </summary>
    ''' <remarks></remarks>
    Public Sub ScrollOneDown()
        If scrollPosition + barsViewable >= GetIndexChartBar("QQQWWW") Then Exit Sub : scrollPosition += 1 : PaintChart()
    End Sub
    ''' <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 Sub GanttChart_Click(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseClick
        If e.Button = Windows.Forms.MouseButtons.Left Then : If mouseOverBottomPart = True Then : ScrollOneDown() : ElseIf mouseOverTopPart = True Then : ScrollOneup() : End If : End If
    End Sub
    ''' <summary>
    ''' When mousewheel is used, the scrollbar will scroll
    ''' </summary>
    ''' <param name="sender"></param>
    ''' <param name="e"></param>
    ''' <remarks></remarks>
    Private Sub GanttChart_MouseWheel(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseWheel
        If e.Delta > 0 Then : ScrollOneup() : Else : ScrollOneDown() : End If
    End Sub
#End Region
#Region "Save"
    ''' <summary>
    ''' Saves the GanttChart to specified image file
    ''' </summary>
    ''' <param name="filePath"></param>
    ''' <remarks></remarks>
    Public Sub SaveImage(ByVal filePath As String)
        objGraphics.SmoothingMode = SmoothingMode.HighSpeed : objGraphics.Clear(Me.BackColor) : If headerFromDate = Nothing Or headerToDate = Nothing Then Exit Sub
        DrawHeader(objGraphics, Nothing) : DrawNetHorizontal(objGraphics) : DrawNetVertical(objGraphics) : DrawBars(objGraphics, True) : objBmp.Save(filePath)
    End Sub
#End Region
    Private Enum MouseOverPart
        Empty
        Bar
        BarLeftSide
        BarRightSide
    End Enum
End Class