/** Build a dropdown list of available airport classes */
static DropDownList *BuildAirportClassDropDown()
{
DropDownList *list = new DropDownList();
for (uint i = 0; i < AirportClass::GetClassCount(); i++) {
*list->Append() = new DropDownListStringItem(AirportClass::Get((AirportClassID)i)->name, i, false);
}
return list;
}
/**
* Show a dropdown menu window near a widget of the parent window.
* The result code of the items is their index in the \a strings list.
* @param w Parent window that wants the dropdown menu.
* @param strings Menu list, end with #INVALID_STRING_ID
* @param selected Index of initial selected item.
* @param button Button widget number of the parent window \a w that wants the dropdown menu.
* @param disabled_mask Bitmask for disabled items (items with their bit set are displayed, but not selectable in the dropdown list).
* @param hidden_mask Bitmask for hidden items (items with their bit set are not copied to the dropdown list).
* @param width Width of the dropdown menu. If \c 0, use the width of parent widget \a button.
*/
void ShowDropDownMenu(Window *w, const StringID *strings, int selected, int button, uint32 disabled_mask, uint32 hidden_mask, uint width)
{
DropDownList *list = new DropDownList();
for (uint i = 0; strings[i] != INVALID_STRING_ID; i++) {
if (!HasBit(hidden_mask, i)) {
*list->Append() = new DropDownListStringItem(strings[i], i, HasBit(disabled_mask, i));
}
}
/* No entries in the list? */
if (list->Length() == 0) {
delete list;
return;
}
ShowDropDownList(w, list, selected, button, width);
}