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Nic
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 Posted: Fri Sep 12, 2003 4:17 pm Post subject: How would you do this? |
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On Borland C++ Builder 6...
I have a list of nodes. Each node contains one number, [0-9]. I want
to show the user the contents of the list. In a console application,
I just cout the value in each node and that's it.
Now in the GUI, I need to display the contents of the list. I have a
picture (.bmp) that represents each possible value.
I do not want to simply draw each picture side by side in an image and
show that, since the user must be able to right-click on each picture
separately and do something with it.
The problem I faced up to now is:
- I do not know how many nodes I have in the list until the user's
done some action so I cannot just pile up TImage objects and use
these. But then how do I create new objects at runtime? Aren't they
deallocated when the print list function completes?
So how to dynamically create objects and associate events and submenus
to these objects?
I hope this is clear enough, Nic.
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pem3v78
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| Posted: Sat Sep 13, 2003 11:20 pm Post subject: Re: How would you do this? |
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Hello,
I'll be brief coz you didn't specify the problem in details.
I suppose You know how to use containers, huh ?
1. Create a container (vector from stl is a good example) to hold pointers
to newly allocated components.
2. When You need more components do them like that (example for TMenuItem
which shows in submenu)
TMenuItem *tmi = new TMenuItem(Regiony); //Regiony is a
popup menu - an owner component
tmi->OnClick = Region1Click; //
When user clicks the menu fire up Region1Click method
(if you got other component eg. Button you have to specyfy the "Parent" -
where the component will be shown, eg.
button->Parent = Form1;
3. Add pointer (tmi) to vector.
4. When Your done with the component use delete operator to delete it from
heap and remove the pointer from collection.
Simple enough ?
Cheers,
Mike
"Nic" <nicflatterie (AT) yahoo (DOT) com> wrote
| Quote: | On Borland C++ Builder 6...
I have a list of nodes. Each node contains one number, [0-9]. I want
to show the user the contents of the list. In a console application,
I just cout the value in each node and that's it.
Now in the GUI, I need to display the contents of the list. I have a
picture (.bmp) that represents each possible value.
I do not want to simply draw each picture side by side in an image and
show that, since the user must be able to right-click on each picture
separately and do something with it.
The problem I faced up to now is:
- I do not know how many nodes I have in the list until the user's
done some action so I cannot just pile up TImage objects and use
these. But then how do I create new objects at runtime? Aren't they
deallocated when the print list function completes?
So how to dynamically create objects and associate events and submenus
to these objects?
I hope this is clear enough, Nic.
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Nic
Guest
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| Posted: Sun Sep 14, 2003 2:15 pm Post subject: Re: How would you do this? |
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"pem3v78" <pem3v78 (AT) wp (DOT) pl> wrote
| Quote: | Hello,
I'll be brief coz you didn't specify the problem in details.
I suppose You know how to use containers, huh ?
1. Create a container (vector from stl is a good example) to hold pointers
to newly allocated components.
2. When You need more components do them like that (example for TMenuItem
which shows in submenu)
TMenuItem *tmi = new TMenuItem(Regiony); //Regiony is a
popup menu - an owner component
tmi->OnClick = Region1Click; //
When user clicks the menu fire up Region1Click method
(if you got other component eg. Button you have to specyfy the "Parent" -
where the component will be shown, eg.
button->Parent = Form1;
3. Add pointer (tmi) to vector.
4. When Your done with the component use delete operator to delete it from
heap and remove the pointer from collection.
Simple enough ?
Cheers,
Mike
|
No I did not know about containers. I will have a look at it, thanks!
Strange, I thought my question was clear enough, but from your answer
I see you understood what I needed anyway.
Nic.
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