Question

I have a MouseEnter event which currently handles some custom controls on my form. The program is a card game. I have a collection (handCards) that gets populated when the user draws a card and then it adds the latest card to the form. This collection holds cards of various custom types, all which inherit from picturebox. Drawing the cards from the deck and adding them to the form works fine. The trouble I am having is that at runtime, after a card is drawn and added to the form, I’ve created an addhandler line of code to have those cards respond to my MouseEnter event, but my addhandler line of code is telling me that MouseEnter is not an event of object. How can I get around this so that after a card is drawn and added to the form, when the mouse enters the new custom control, my MouseEnter event fires? Here’s one of the many things I’ve tried and what I think should be the simplest and easiest that should work.

deck.DrawCard()
AddHandler handCards(handCards.Count).MouseEnter, AddressOf Cards_MouseEnter

P.S. the MouseEnter event works fine for custom controls that are on the form prior to runtime and all it does is take the image of the control and enlarge it by placing the image to a bigger card on the form.

Answer 1

So this is how I fixed it, in case anyone comes across this post. Made a separate Sub to do the AddHandler. After the program draws a card, it calls upon this method, which then adds the MouseEnter handler I need. The ByVal was key. I originally thought I was supposed to use ByRef, but no. MouseEnter is an event of control, but apparently not Object, so now it works.

Public Sub addHandlers(ByVal inputObject As Control)
    AddHandler inputObject.MouseEnter, AddressOf Cards_MouseEnter
End Sub