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trap up/down arrow click event from updowncontrol

Posted on 2013-01-30
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Last Modified: 2013-01-31
I have a VisualStudio 2008 / VisualBasic 2008 (.Net) application with a form that includes a numeric up/down control.  I need to trap the up/down arrow click so that I can programmatically increment the value:
When the user uses the KBD (or cut-n-paste etc.) to enter/change the value the resulting value can be anything between min and max.
When the up/down arrow is used the resulting value must be the next higher/lower multiple of a specific increment - as long as it does not violate min or max ( if it does value is to remain unchanged ).
Increment = 12, Current value is 24, user can change value to 31
Increment = 12, Current value is 31, user clicks down arrow; resulting value is 24
Increment = 12, Current value is 31, user clicks up arrow; resulting value is 36
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Question by:Swamp_Thing
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Mike Tomlinson earned 350 total points
ID: 38837352
Inherit from NumericUpDown() and override the UpButton() and DownButton() methods, which fire when the user clicks the arrows OR the Up/Down arrow keys are used:
Public Class MyNumericUpDown
    Inherits NumericUpDown

    Public Overrides Sub UpButton()
        If Me.Value Mod Me.Increment = 0 Then
            MyBase.UpButton()
        Else
            Me.Value = Math.Min((CInt(Me.Value) \ CInt(Me.Increment) + 1) * Me.Increment, Me.Maximum) ' <-- INTEGER division!
        End If
    End Sub

    Public Overrides Sub DownButton()
        If Me.Value Mod Me.Increment = 0 Then
            MyBase.DownButton()
        Else
            Me.Value = Math.Max((CInt(Me.Value) \ CInt(Me.Increment)) * Me.Increment, Me.Minimum) ' <-- INTEGER division!
        End If
    End Sub

End Class

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When you rebuild or run, the new control will appear at the TOP of the ToolBox.  Use that instead of the normal NumericUpDown.
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Expert Comment

by:John (Yiannis) Toutountzoglou
ID: 38837542
wow!!!!!!! ...You Dont exist!! :)
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Expert Comment

by:Mike Tomlinson
ID: 38837564
Lol...you figured me out jtoutou!  I'm a manifestation of the accumulated knowledge on the web.  I exist solely as a sentient digital entity in the bowels of the interwebs.  ;)
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Author Comment

by:Swamp_Thing
ID: 38839758
It took a couple of tries to figure out where this code goes...   Initially I put it into one of my modules but no control showed up on the tools in design mode and the event didn't fire.  What worked was to paste the code into one of my forms .Designer.vb code at the very top - prior to the "<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _" and "Partial Class <formname>" etc. etc.
I did not need to drag-n-drop the new control onto my form:  I changed the .Designer.vb code from defining my existing control as “New System.Windows.Forms.NumericUpDown” to “New <MyProjectName>.MyNumericUpDown”
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Author Closing Comment

by:Swamp_Thing
ID: 38839772
I'm not a novice but something along the lines of "cut-n-paste this code into the very beginning of your main forms .Designer.vb file" would have helped.

Crystal clear answer - 100% complete and accurate sample code!
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Expert Comment

by:Mike Tomlinson
ID: 38839789
Ah...there's more than one way to add the control to your project.  Just ask next time.  Glad it worked for you.  =)
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