[2005] DateTimePicker Up/Down Arrow Problem

Hello,

I have a datetimepicker on my form which is formatted to show time (HH:mm)
This works a treat, but what I'd really like to do is have the minutes increment in blocks of 15 instead of the usual 1.

Is this possible ?
If so, how ?

Thanks.

There's no way to do that with a regular DTP. You'd have to inherit the control and then implement the functionality yourself, although I'm not 100% sure how. You could override the WndProc method and work with its Windows messages perhaps. You may also be able to access the internal spinner control via its Controls collection. That may enable you to handle its events and determine when the value is to be incremented or decremented. This is all just conjecture though.

If you disallow the user from entering a time manually (this action is inhibited in the in code below), this gets you most of the way there...

Code:

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Option Strict On
Option Strict On
Public Class Form1

    Dim ReferenceClock As Date

    Private Sub Form1_Load( _
    ByVal sender As System.Object, _
    ByVal e As System.EventArgs) _
    Handles MyBase.Load

        'Set DateTimePicker Format Hour:Minutes (24 hour with no Seconds field)
        DT.Format = DateTimePickerFormat.Custom
        DT.CustomFormat = "HH:mm"
        DT.ShowUpDown = False

        'Initialize the DateTimePicker to today
        Date.TryParse(Date.Today.ToString("dd/MM/yyyy") & " 00:00:00", ReferenceClock)
        DT.Value = ReferenceClock

    End Sub

    Private Sub DT_KeyDown( _
    ByVal sender As System.Object, _
    ByVal e As System.Windows.Forms.KeyEventArgs) _
    Handles DT.KeyDown
        'Note: We cannot discern between an hour or minute adjustment
        'so the up/down keys will have the same function whether in the
        'hour or minute field
        If e.KeyValue = Keys.Up Or e.KeyValue = Keys.Down Then
            'Increment
            If e.KeyValue = Keys.Up Then ReferenceClock = ReferenceClock.AddMinutes(15)
            'Decrement
            If e.KeyValue = Keys.Down Then ReferenceClock = ReferenceClock.AddMinutes(-15)
            'Update DateTimePicker
            DT.Value = ReferenceClock
        End If
    End Sub

    Private Sub DT_ValueChanged( _
    ByVal sender As System.Object, _
    ByVal e As System.EventArgs) _
    Handles DT.ValueChanged
        'Since the DateTimePicker will default to an increment/decrement of 1
        'this updates it again when the KeyDown event is completed
        'This also inhibits the user from manually specifying a time
        DT.Value = ReferenceClock
    End Sub

End Class

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