Solved

How to share an event handler between forms?

Posted on 2008-10-15
3
341 Views
Last Modified: 2012-05-05
I have event handler code in one form of an application that I would like to use for a component event in another form of the application.  

Each of the forms lists each other in the uses statement. but I can't see handlers from the other form in an event dropdown in the object inspector and if I type in the name of the procedure (<other_form_name>.<proc_name>) I receive an IDE error that the name is not a valid identifier.

Thanks.
0
Comment
Question by:ttheimer
3 Comments
 
LVL 14

Expert Comment

by:SteveBay
ID: 22726080
That's right. You need to make the event handler assignment at runtime.
0
 
LVL 17

Accepted Solution

by:
TheRealLoki earned 250 total points
ID: 22726090
let's say you want to use form 1's event on your form 2.
make sure
uses unit1
is in the "TOP" uses clause

and in unti1.pas, you have
uses unit2 in the bottom uses clause (after the implementation line)

It should work then

You can also assign it at runtime if you want

e.g. click on form 2, and then in the object inspector (F11) double click in it's "OnCreate" event
then put this code

procedure TForm2.FormCreate(sender: TObject);
begin
  Button1.OnClick := form1.ButtonAClick;
end;
0
 

Author Comment

by:ttheimer
ID: 22727853
TheRealLoki

I was able to define the event handlers upon execution using the second half of your answer.  

I tried setting up as described in the first half but never got it to work.  It made sense and I went back to check my setup but then ran out of time for further testing.  I will probably come back to this when more free time is available so I would be interested if this is a tested solution or a theory.

Thanks.
Tom
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now