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control array Borland C++ Builder Visual Basic

Posted on 2001-07-30
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Last Modified: 2013-11-25
Using Borland C++ Builder, how does one create a control array?

In Visual Basic it is very simple, just highlight the control in design view and paste it, VB asks if you want to create a control array.  In Builder however, the subject of control arrays is not even mentioned in the help files.  It's amazing in such a faithful reproduction of each others products, that this very helpful and simple interface was skipped over.

I would like to create 256 Panels on a Form during run time, and treat them as an array for iteration purposes.

Example source code is desirable.

Thanks in Advance:)
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Question by:lirtua
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Accepted Solution

by:
AlexVirochovsky earned 60 total points
ID: 6336675
You must to make simething as (example for TButton):
TButton * buttons[200];
for (int i = 0; i < sizeof(buttons) / sizeof(*buttons); ++i)
{
buttons[i] = new TButton(whatever);
}
After that you must add events (example for OnClick:)
void __fastcall TMyForm::MyClick(TObject* Sender)
{
}

for (int i = 0; i < sizeof(buttons) / sizeof(*buttons); ++i)
{
buttons[i]->OnClick = MyClick;
}

See full discussion in
http://www.mers.com/MERLIST/BORLAND/PUBLIC/CPPBUILDER/LANGUAGE/37757.HTML
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LVL 14

Expert Comment

by:AlexVirochovsky
ID: 6375437
I hope, my info helps you. Alex
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Author Comment

by:lirtua
ID: 6520561
Sorry, the controls are not showing up on my form.  Here is my source code:

   for(int i = 0; i < NUM_IMG; ++i)
   {
      image[i] = new TImage(ScrollBox1);
      image[i]->Picture = Image1->Picture;
      image[i]->Top = i * 10;
      image[i]->Left = 10;
      image[i]->AutoSize = true;
      image[i]->Visible = true;
      image[i]->Invalidate();
   }

On the form is a scrollbox containing an image that has a bitmap loaded at design time.  The control array should be located in the scrollbox and have the same pictures as the design time image.
0
 

Author Comment

by:lirtua
ID: 6520611
Oh - forgot to mention this also in source code:

#define NUM_IMG 10
TImage * image[NUM_IMG];
0
 

Author Comment

by:lirtua
ID: 6520673
Your code is very close.  There is one thing missing though.  For some reason the constructor does not set the Parent property.  So we have to do this explicitly as follows:

      image[i] = new TImage(sbPictureScrollBox);
      image[i]->Parent = sbPictureScrollBox;

With this addition, the code above works.
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