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Subrat B.
Guest
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 Posted: Thu Apr 22, 2004 2:57 am Post subject: determining TComponent property at runtime |
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hi.
How do i determine if TComponent object such as (Textbox,
Tform,Richedit,Button etc etc) can be applied with .caption or .text at
RUNTIME.
i want to make a common function called setText(Tcomponent *x ,AnsiString
a)
which will determine the type of TComponent x and either do
x->Caption = a;
or
x->Text=a;
Thanks
Subrat
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JD
Guest
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| Posted: Thu Apr 22, 2004 3:38 am Post subject: Re: determining TComponent property at runtime |
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"Subrat B." <subrat (AT) myktm (DOT) com> wrote:
| Quote: | How do i determine if TComponent object such as (Textbox,
Tform,Richedit,Button etc etc) can be applied with .caption
or .text at RUNTIME.
|
You will have to use dynamic_cast to cast the TComponent to
the appropriate class and then set the corresponding property.
However, I would pass a TControl instead (String - upper case
'S' is shorthand for AnsiString):
void __fastcall TForm1::SetCaption( TControl* pControl, String Text )
{
TForm* pForm = dynamic_cast<TForm*>( pControl );
if( pForm ) pForm->Caption = Text;
else
{
TEdit* pEdit = dynamic_cast<TEdit*>( pControl );
if( pEdit ) pEdit->Text = Text;
else
{
// continue testing
}
}
}
~ JD
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Remy Lebeau (TeamB)
Guest
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| Posted: Thu Apr 22, 2004 8:04 pm Post subject: Re: determining TComponent property at runtime |
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"Subrat B." <subrat (AT) myktm (DOT) com> wrote
| Quote: | How do i determine if TComponent object such as (Textbox,
Tform,Richedit,Button etc etc) can be applied with .caption
or .text at RUNTIME.
|
You would have to either:
1) use dynamic_cast
void __fastcall SetText(TComponent *Comp, const AnsiString &Str)
{
if( (TEdit *edit = dynamic_cast<TEdit*>(Comp)) != NULL )
edit->Text = Str;
else if( (TButton *btn = dynamic_cast<TButton*>(Comp)) != NULL )
btn->Caption = Str;
// etc...
}
2) use the VCL's RTTI (runtime type information) system (the only problem
with this approach is that it only works with published properties):
#include <TypInfo.hpp>
void __fastcall SetText(TComponent *Comp, const AnsiString &Str)
{
PPropInfo pPropInfo = GetPropInfo(Comp, "Caption");
if( !pPropInfo )
pPropInfo = GetPropInfo(Comp, "Text");
// etc...
if( pPropInfo )
SetStrProp(Comp, pPropInfo, Str);
}
Gambit
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