/** 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); }