void wxListBox::EnsureVisible(int n)
{
wxCHECK_RET( IsValid(n),
wxT("invalid index in wxListBox::EnsureVisible") );
// when item is before the first visible item, make the item the first visible item
const int firstItem = SendMessage(GetHwnd(), LB_GETTOPINDEX, 0, 0);
if ( n <= firstItem )
{
DoSetFirstItem(n);
return;
}
// retrieve item height in order to compute last visible item and scroll amount
const int itemHeight = SendMessage(GetHwnd(), LB_GETITEMHEIGHT, 0, 0);
if ( itemHeight == LB_ERR || itemHeight == 0)
return;
// compute the amount of fully visible items
int countVisible = GetClientSize().y / itemHeight;
if ( !countVisible )
countVisible = 1;
// when item is before the last fully visible item, it is already visible
const int lastItem = firstItem + countVisible - 1;
if ( n <= lastItem )
return;
// make the item the last visible item by setting the first visible item accordingly
DoSetFirstItem(n - countVisible + 1);
}
void wxListBoxBase::SetFirstItem(const wxString& s)
{
int n = FindString(s);
wxCHECK_RET( n != wxNOT_FOUND, wxT("invalid string in wxListBox::SetFirstItem") );
DoSetFirstItem(n);
}
