Delegates and KeyUp

Delegates and KeyUp

• Vijay Subramani

  I am not using the designer to add my inkedits i am doing it programmatically. when the user selects a template to load i create it there.

  so in my parse file subroutine i need to do something like

  addhandler inkedititem.keyup, addressof <something>

  but i cannot figure out the syntax. the compiler wants a delegate in place of the something...

  
  

• MAMMOTH_MK

  How do i add / what is the syntax for a keyup delegate / function that will capture the F2 key

  Thanks,

   

  //globals

  Dim GlobalKeyHandler As KeyUpDelegate

  //form_1load

  'point the delegate to the desired function

  GlobalKeyHandler = AddressOf KeyUpHandler

   

  //define the delegate and function

  Public Delegate Sub KeyUpDelegate(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs)

  Public Sub KeyUpHandler(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs)

  End Sub

   

  //inside add inkedit loop

  **** it doesnt like this because GlobalKeyHandler isnt a method...but it insists on a delegate object...huh

  AddHandler InkEditItem.KeyUp, addressof GlobalKeyHandler   !error

   

  
  

• digital rebel

  It did help indeed. Thank you very much!!!
  

• quacka

  either way would be fine but that still has the same problem of requiring the whole delegate thing...im happy to learn i just cant find a decent example...
  

• Brian Brashear

  The simplest form of Delegate is as follows:

  Private Delegate Sub DelMyProcedure(Byval Parameter1 as String, Byval Parameter2 as String)
  Private Sub MyProcedure(Byval Parm1 as String, Byval Parm2 as String)
  If WhateverControl.InvokeRequired Then
  Dim poCB as New DelMyProcedure(AddressOf MyProcedure)
  Dim poParm(1) as Object
  poParm(0) = Parm1
  poParm(1) = Parm2
  WhateverControl.Invoke(poCB, PoParm)
  Else
  WhateverControl.WhateverProperty = Parm1
  WhateverControl.AnotherPropert = Parm2
  End If
  End Sub

  Typed from memory so I appologize for any typo's.

  
  

• Johan Stenberg

  I found a lame way to handle it. make an invisible menu strip item with function key shortcut and handle the click. its lame but it works. I would not have thought that getting the function keys would be a such a chore in .net....bleah. i would apperciate a "real" answer is anyone has one.

  Thanks,

  Dan

  
  

• boest02

  I have a similar issue for the Euchre game that I wrote. I decided to let the form handle the F2 key (since it always exists, and I therefore avoid adding handlers all over the place) , and then I'd worry about what was selected in the handler.

  Private Sub EuchreTable_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyUp

  If e.KeyCode = Keys.F2 Then

  // .... figure stuff out here ...

  End If

  End Sub

  Basically, I just went to the drop-downs, selected the "EuchreTable" events on the left, the "KeyUp" on the right, filled in the check for Keys.F2 and that was pretty much it.

  I hope this helps -- if not, I'll follow up.

  --Matt--*

  
  
  

• AleksL

  Would turning on the form's KeyPreview property, then monitoring the KeyDown/Up events for the form accomplish your goal
  

• ThisIsBrianS

  I swear i tried that same approach 10 times and the compiler kept squaking about wanting a delegate...and wouldnt accept that sub routine..dunno what the problem was but it works now.

  Thanks!

  
  

• Lee Stallworth

  You basically need to declare a function that has the same signature as the delegate. In this case Matt already provided you with the signature that you need to use:

  Private Sub KeyUp_Handler(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs)

  If e.KeyCode = Keys.F2 Then
  // .. figure stuff out here ...
  End If
  End Sub

  Then you just need to call AddHandler with the event name and the address of the method handler like this:

  AddHandler inkedititem.keyup, AddressOf Keyup_Handler

  Don't forget to call RemoveHandler when you don't need the object anymore.

  Hope that helps,

  
  
  
• Delegates and KeyUp