I would like to create a countdown column in a gridview, based on a date in another BondFiled column in the same gridview.
Reverend Jim 4,968 Hi, I'm Jim, one of DaniWeb's moderators. Moderator Featured Poster
What is a BondFiled column? Do you mean a bound field column? What kind of data does it contain and what do you want to happen? How will the timer be started and stopped? Do you want one countdown for each record? Details please.
Edited by Reverend Jim
Reverend Jim 4,968 Hi, I'm Jim, one of DaniWeb's moderators. Moderator Featured Poster
Public Class Form1
Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
DataGridView1.Rows.Add({"Jim", 12})
DataGridView1.Rows.Add({"Bob", 19})
End Sub
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Timer1.Enabled = True
End Sub
Private Sub Timer1_Tick(sender As System.Object, e As System.EventArgs) Handles Timer1.Tick
For row As Integer = 0 To DataGridView1.Rows.Count - 1
Dim num As Integer = DataGridView1.Rows(row).Cells(1).Value
DataGridView1.Rows(row).Cells(1).Value = num - 1
Next
End Sub
End Class
This is a simple case. You can modify it to handle the date/time as you display it.
TnTinMN 418 Practically a Master Poster
It's cold and raining and I don't feel like doing the dishes, and this looked like an interesting diversion, so here you go with a dgv Column to countdown from a datetime column. :) Boy how I wish this forum supported putting code in a scrollbox!
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim dt As New DataTable
Dim r As DataRow
With dt
.Columns.Add("dt", GetType(DateTime))
r = .NewRow : r(0) = Now.AddMinutes(1) : .Rows.Add(r)
r = .NewRow : r(0) = Now.AddHours(1) : .Rows.Add(r)
r = .NewRow : r(0) = Now.AddSeconds(10) : .Rows.Add(r)
r = .NewRow : r(0) = Now.AddDays(1).AddHours(2).AddMinutes(5) : .Rows.Add(r)
End With
DataGridView1.DataSource = dt
Dim countdown As New DGVColumnDateCountDown
countdown.ComparisionColumn = DataGridView1.Columns("dt")
DataGridView1.Columns.Add(countdown)
End Sub
End Class
Public Class DGVColumnDateCountDown
Inherits DataGridViewTextBoxColumn
Public Sub New()
[ReadOnly] = True
tmrUpdate.Start()
End Sub
Private WithEvents tmrUpdate As New System.Windows.Forms.Timer With {.Interval = 1000}
Private _PositiveColor As Color = Color.Black
Public Property PositiveColor() As Color
Get
Return _PositiveColor
End Get
Set(ByVal value As Color)
_PositiveColor = value
End Set
End Property 'PositiveColor
Private _NegativeColor As Color = Color.Red
Public Property NegativeColor() As Color
Get
Return _NegativeColor
End Get
Set(ByVal value As Color)
_NegativeColor = value
End Set
End Property 'NegativeColor
Private _ComparisionColumn As DataGridViewColumn
Public Property ComparisionColumn() As DataGridViewColumn
Get
Return _ComparisionColumn
End Get
Set(ByVal value As DataGridViewColumn)
_ComparisionColumn = value
End Set
End Property 'SourceColumn
Private _UpdateInterval As Int32
<System.ComponentModel.Description("Update time in seconds")> _
Public Property UpdateInterval() As Int32
Get
Return _UpdateInterval
End Get
Set(ByVal value As Int32)
If value < 0 Then Throw New ArgumentException("Must be >= 0")
_UpdateInterval = value * 1000
End Set
End Property 'UpdateInterval
Private Sub SetTimer()
If _UpdateInterval = 0 Then
tmrUpdate.Enabled = False
Else
tmrUpdate.Interval = _UpdateInterval
tmrUpdate.Enabled = True
End If
End Sub
Private Sub tmrUpdate_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles tmrUpdate.Tick
If Me.DataGridView Is Nothing OrElse ComparisionColumn.DataGridView Is Nothing Then Exit Sub
If Not ComparisionColumn.DataGridView.Equals(Me.DataGridView) Then
Throw New ArgumentException("Invalid Source Column on Countdown Column: " & Me.Name)
End If
Dim si As Int32 = ComparisionColumn.Index
Dim dtsource As DateTime
Dim currentTime As DateTime = Now 'lock time for update
For Each row As DataGridViewRow In Me.DataGridView.Rows
If row.Cells(si).Value IsNot Nothing Then
' see if it is a valid date
If row.Cells(si).ValueType Is GetType(DateTime) Then
dtsource = CType(row.Cells(si).Value, DateTime)
If dtsource <> DateTime.MinValue Then
' got something to work with
Dim diff As dtDifferenceStruct = dtDifference(dtsource, currentTime)
Dim sb As New System.Text.StringBuilder(50)
sb.Append(diff.Years.ToString & " years ")
sb.Append(diff.Months.ToString & " months ")
sb.Append(diff.Days.ToString & " days ")
sb.Append(diff.Hrs.ToString & " hours ")
sb.Append(diff.Sec.ToString & " seconds")
If diff.Preceeding Then
row.Cells(Index).Style.ForeColor = NegativeColor
Else
row.Cells(Index).Style.ForeColor = PositiveColor
End If
row.Cells(Index).Value = sb.ToString
Else
row.Cells(Index).Value = ""
End If
End If
End If
Next
End Sub
Private Structure dtDifferenceStruct
Public Years As Int32
Public Months As Int32
Public Days As Int32
Public Hrs As Int32
Public Min As Int32
Public Sec As Int32
Public MillSec As Int32
Public Preceeding As Boolean
End Structure
Private Function dtDifference(ByVal LatterDate As DateTime, ByVal EarlierDate As DateTime) As dtDifferenceStruct
Dim ret As New dtDifferenceStruct
' accumulator should start with the smaller of the 2 datetimes
Dim accumulator As DateTime
If LatterDate >= EarlierDate Then
ret.Preceeding = False
accumulator = EarlierDate
Else
ret.Preceeding = True
accumulator = LatterDate
LatterDate = EarlierDate
End If
Dim ts As TimeSpan = LatterDate.Subtract(accumulator)
ret.Years = CInt(Microsoft.VisualBasic.DateDiff(DateInterval.Year, accumulator, LatterDate))
accumulator = accumulator.AddYears(ret.Years)
ts = LatterDate.Subtract(accumulator)
ret.Months = CInt(Microsoft.VisualBasic.DateDiff(DateInterval.Month, accumulator, LatterDate))
accumulator = accumulator.AddMonths(ret.Months)
ts = LatterDate.Subtract(accumulator)
ret.Days = CInt(Microsoft.VisualBasic.DateDiff(DateInterval.Day, accumulator, LatterDate))
accumulator = accumulator.AddDays(ret.Days)
ts = LatterDate.Subtract(accumulator)
ret.Hrs = CInt(Microsoft.VisualBasic.DateDiff(DateInterval.Hour, accumulator, LatterDate))
accumulator = accumulator.AddHours(ret.Hrs)
ts = LatterDate.Subtract(accumulator)
ret.Min = CInt(Microsoft.VisualBasic.DateDiff(DateInterval.Minute, accumulator, LatterDate))
accumulator = accumulator.AddMinutes(ret.Min)
ts = LatterDate.Subtract(accumulator)
ret.Sec = CInt(Microsoft.VisualBasic.DateDiff(DateInterval.Second, accumulator, LatterDate))
accumulator = accumulator.AddSeconds(ret.Sec)
ts = LatterDate.Subtract(accumulator)
ret.MillSec = ts.Milliseconds
Return ret
End Function
End Class
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