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Lance Robaldo
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 Posted: Wed Nov 26, 2003 8:06 pm Post subject: TComboBox with Typing |
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I'm looking for a way to have a TComboBox do an incremental search much like
the way it does if you set it's style to "DropDownList".
However, I don't want to restrict the user to ONLY typing what's in the
list.
Is there any way around this?
Thank you,
Lance Robaldo
[email]Lance (AT) Robaldo (DOT) com[/email]
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JD
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| Posted: Thu Nov 27, 2003 11:05 am Post subject: Re: TComboBox with Typing |
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"Lance Robaldo" <RRobaldo (AT) wltsoftware (DOT) com> wrote:
| Quote: | I'm looking for a way to have a TComboBox do an incremental
search much like the way it does if you set it's style
to "DropDownList".
|
Set it's AutoComplete property to true. If your version
doesn't have an AutoComplete property, have a look here:
http://www.torry.net/enhancedlistandcomboboxes.htm
If you don't want to use a 3rd party component, you can mimic
the same behavior using the OnKeyPress event. Performance may
become an issue however if the number of items gets too large
(untested):
void __fastcall TForm1::ComboBox1KeyPress(TObject* Sender, char &Key)
{
TComboBox* CB = static_cast<TComboBox*>( Sender );
int size = CB->GetTextLen() + 2;
char* Buf = new char[ size ];
strcpy( Buf, CB->Text.c_str() );
CB->SelLength = 0;
int curpos = CB->SelStart;
Buf[ curpos ] = Key;
Buf[ curpos + 1 ] = 0;
int Index = 0;
if( CB->ItemIndex > -1 )
{
if( strncmp( Buf, CB->Items->Strings[ CB->ItemIndex ].c_str(), strlen( Buf ) - 1 ) <= 0 )
Index = CB->ItemIndex;
}
for( int x = Index; x < CB->Items->Count; ++x )
{
int Result = strncmp( Buf, CB->Items->Strings[ x ].c_str(), strlen( Buf ) );
if( Result == 0 )
{
Index = x;
break;
}
else if( Result > 0 )
{
Index = -1;
break;
}
}
CB->ItemIndex = Index;
if( Index > -1 )
{
CB->Text = CB->Items->Strings[ Index ];
CB->SelStart = curpos + 1;
CB->SelLength = CB->GetTextLen() - CB->SelStart;
Key = 0;
}
delete [] Buf;
}
~ JD
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