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How to Exchange values in a LISTBOX

 
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Cenk
Guest
PostPosted: Thu Apr 06, 2006 3:03 pm    Post subject: How to Exchange values in a LISTBOX Reply with quote


Hi,

i have a ListBox and i wanna change some elements of it.

Eg.
ListBox1 ListBox1
1 1
2 -----> 19
3 3
4 4
5 5
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Vladimir Stefanovic
Guest
PostPosted: Thu Apr 06, 2006 3:03 pm    Post subject: Re: How to Exchange values in a LISTBOX Reply with quote


Quote:
Eg.
ListBox1 ListBox1
1 1
2 -----> 19
3 3
4 4
5 5

// second element
ListBox1->Items->Strings[1] = 19;



--
Best Regards,
Vladimir Stefanovic
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JD
Guest
PostPosted: Thu Apr 06, 2006 5:03 pm    Post subject: Re: How to Exchange values in a LISTBOX Reply with quote


"Cenk" <cenk1536 (AT) yahoo (DOT) com> wrote:
Quote:

i have a ListBox and i wanna change some elements of it.

Your subject says exchange. If that's what you *really* want,
given two indexs into it's Items:

//-------------------------------------------------------------
void __fastcall TForm1::ExchangeItems( TListBox *pBox, int x, int y )
{
if( x < 0 || y < 0 || x > (pBox->Count - 1) || y > (pBox->Count - 1) )
{
throw Exception( "TListBox::Exchange : Index out of bounds." );
}
if( x == y ) return;

int First, Last;
AnsiString S;
TObject *pObject;

if( x < y )
{
First = x;
Last = y;
}
else
{
First = y;
Last = x;
}

::SendMessage( pBox->Handle, WM_SETREDRAW, FALSE, 0 );

S = pBox->Items->Strings[ First ];
pObject = pBox->Items->Objects[ First ];
pBox->Items->Strings[ First ] = pBox->Items->Strings[ Last ];
pBox->Items->Objects[ First ] = pBox->Items->Objects[ Last ];
pBox->Items->Strings[ Last ] = S;
pBox->Items->Objects[ Last ] = pObject;

::SendMessage( pBox->Handle, WM_SETREDRAW, TRUE, 0 );
pBox->Invalidate();
}
//-------------------------------------------------------------

You could also do it with strings and using the Items::IndexOf
method in addition to using the Items::IndexOfObject method as
well.

~ JD
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JD
Guest
PostPosted: Thu Apr 06, 2006 7:03 pm    Post subject: Re: How to Exchange values in a LISTBOX Reply with quote
"JD" <nospam (AT) nospam (DOT) com> wrote:
Quote:

int First, Last;

I was thinking of inserting and deleting but this wasn't
needed with a temporary but I didn't remove it from the code.

//-------------------------------------------------------------
void __fastcall TForm1::ExchangeItems( TListBox *pBox, int x, int y )
{
if( x < 0 || y < 0 || x > (pBox->Count - 1) || y > (pBox->Count - 1) )
{
throw Exception( "TListBox::Exchange : Index out of bounds." );
}
else if( x == y ) return;

AnsiString S;
TObject *pObject;
::SendMessage( pBox->Handle, WM_SETREDRAW, FALSE, 0 );

S = pBox->Items->Strings[ x ];
pObject = pBox->Items->Objects[ x ];
pBox->Items->Strings[ x ] = pBox->Items->Strings[ y ];
pBox->Items->Objects[ x ] = pBox->Items->Objects[ y ];
pBox->Items->Strings[ y ] = S;
pBox->Items->Objects[ y ] = pObject;

::SendMessage( pBox->Handle, WM_SETREDRAW, TRUE, 0 );
pBox->Invalidate();
}
//-------------------------------------------------------------

~ JD
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