Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

How do I override TRichEdit.Lines.Add ?

Posted on 2011-02-10
6
Medium Priority
?
415 Views
Last Modified: 2012-05-11
I need to override TRichEdit.Lines.Add in order to do some processing there, before adding the text in the RichEdit. How can I do that? Can I do that directly?
0
Comment
Question by:cubic77
  • 3
  • 3
6 Comments
 
LVL 32

Expert Comment

by:Ephraim Wangoya
ID: 34864597

Not exactly, the TStrings.Add method itself can be overriden but TRichEdit is not structured in such a way to allow you to do that easily

you can go around it by using the code as follows in your form unit
type
  TRichEdit = class(ComCtrls.TRichEdit)
  public
    function Add(const AString: string): Integer; 
  end;
  
  TForm1 = class(TForm)
    ............
  end;

implementation

function TRichEdit.Add(const AString: string): Integer;
var
  NewString: string;
begin
  //do something with the string and assign the new value to NewString
  Result := Lines.Add(NewString);
end;

Open in new window

0
 
LVL 32

Expert Comment

by:Ephraim Wangoya
ID: 34864613
So instead of using
  RichEdit1.lines.Add(xxx)

you will use
  RichEdit1.Add(xxxxx)
0
 

Author Comment

by:cubic77
ID: 34864789
Thanks, but I already implemented exactly the same thing. Until I get the answer to my original question, this solution is acceptable but far from good. Why I don't consider it a GOOD solution? Because I have to remember that I have to use the exception (RichEdit.Add) instead of the normal method.

So, probably in 3-4 months I will accidentally use RichEdit.Lines.Add and I will start to wonder why my RichEdit is not working as expected.
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:cubic77
ID: 34864822
Actually this solution will became GOOD if the is a way to make the original method (lines.add) not to work anymore. In this case obviously I will see the error message while trying to use it and I will probably remember to use the new method.
0
 
LVL 32

Accepted Solution

by:
Ephraim Wangoya earned 2000 total points
ID: 34864849
In that case you will have to encapsulate the TRichEdit in a new control, then expose the public methods of TRichEdit and install that control in your component palette.

Then replace all your TRichEdit controls with the new one.

I can show you how to do that, but right now I'm working on something
0
 

Author Comment

by:cubic77
ID: 34864914
> I can show you how to do that, but right now I'm working on something
No. I got it. Thanks.

I also had that idea. What I actually wanted was to see if there is any way to override (for real) the Add method.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

If you haven’t already, I encourage you to read the first article (http://www.experts-exchange.com/articles/18680/An-Introduction-to-R-Programming-and-R-Studio.html) in my series to gain a basic foundation of R and R Studio.  You will also find the …
Whether you’re a college noob or a soon-to-be pro, these tips are sure to help you in your journey to becoming a programming ninja and stand out from the crowd.
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.
Suggested Courses

916 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