access control for IDE components
Is there a way to make vcl design-time components private? For example, if my form contains a TTable called Table1, and my code looks like this: TfrMyForm* MyForm1 = new TfrMyForm(this); MyForm1->Table1->DatabaseName = "C:/temp"; MyForm1->Table1->TableType = ttParadox; MyForm1->Table1->TableName = "Table1.db"; MyForm1->ShowModal(); if (MyForm1->Table1->Active) MyForm1->Table1->Close(); delete MyForm1; ....why am I able to manipulate Table1's database name and table name and tabletype properties? I instead want it to be necessary to have a member function handle it, like so: TfrMyForm* MyForm1 = new TfrMyForm(this); MyForm1->ConfigureTables(); MyForm1->ShowModal(); MyForm1->CloseTables(); delete MyForm1; This way, we can restrict manipulation of the form's components to only the member functions, and any change to these components later on necessitates only a change in the member functions and not (potentially) code all throughout the entire project. Isn't that how standard C++ object code is supposed to work?
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Evan
7/13/2009 2:46:44 PM
embarcadero.cppbuilder.ide
2180 articles. 
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<Evan Streb> wrote in message news:136856@forums.codegear.com... > Is there a way to make vcl design-time components private? No. They must be declared as __published in order to work at design-time, and __published has the same visibility as public. > For example, if my form contains a TTable called Table1, and my code looks > like this: <snip> > ...why am I able to manipulate Table1's database name and table > name and tabletype properties? Because Table1 is publically visible to outside code. > I instead want it to be necessary to have a member function handle it, > like so: In order to do that in your current code, you would have to declare Table1 as private or protected - but then you would lose design-time support for Table1. What you could do instead is move Table1 to a separate TDataModule, and then have TfrMyForm instantiate and use that TDataModule internally as needed. That way, you still have design-time support for Table1, as well as keeping it isolated from any public access. -- Remy Lebeau (TeamB)
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Remy
7/13/2009 5:11:55 PM
So I guess my question then is why do __published components have the same visibility as public ones? Why was it deemed necessary to give design-time components public access? Because if they were private by default it would've been much more time-consuming to write simple code?
Evan
> {quote:title=Remy Lebeau (TeamB) wrote:}{quote}
> <Evan Streb> wrote in message news:136856@forums.codegear.com...
>
> > Is there a way to make vcl design-time components private?
>
> No. They must be declared as __published in order to work at design-time,
> and __published has the same visibility as public.
>
> > For example, if my form contains a TTable called Table1, and my code looks
> > like this:
> <snip>
> > ...why am I able to manipulate Table1's database name and table
> > name and tabletype properties?
>
> Because Table1 is publically visible to outside code.
>
> > I instead want it to be necessary to have a member function handle it,
> > like so:
>
> In order to do that in your current code, you would have to declare Table1
> as private or protected - but then you would lose design-time support for
> Table1.
>
> What you could do instead is move Table1 to a separate TDataModule, and then
> have TfrMyForm instantiate and use that TDataModule internally as needed.
> That way, you still have design-time support for Table1, as well as keeping
> it isolated from any public access.
>
> --
> Remy Lebeau (TeamB)
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Evan
7/13/2009 6:55:10 PM
<Evan Streb> wrote in message news:137008@forums.codegear.com... > So I guess my question then is why do __published components have > the same visibility as public ones? Because '__published' is essentially the same as 'public', just with compiler-generated RTTI attached to it. > Why was it deemed necessary to give design-time components public access? You would have to ask the original Borland developers. __published has always been public. -- Remy Lebeau (TeamB)
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Remy
7/13/2009 8:28:54 PM
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