/**
* Create a dropdown menu.
* @param parent Parent window.
* @param list Dropdown item list.
* @param selected Index of the selected item in the list.
* @param button Widget of the parent window doing the dropdown.
* @param instant_close Close the window when the mouse button is raised.
* @param position Topleft position of the dropdown menu window.
* @param size Size of the dropdown menu window.
* @param wi_colour Colour of the parent widget.
* @param scroll Dropdown menu has a scrollbar.
* @param widget Widgets of the dropdown menu window.
*/
DropdownWindow(Window *parent, const DropDownList *list, int selected, int button, bool instant_close, const Point &position, const Dimension &size, Colours wi_colour, bool scroll)
: Window(&_dropdown_desc)
{
assert(list->Length() > 0);
this->position = position;
this->CreateNestedTree();
this->vscroll = this->GetScrollbar(WID_DM_SCROLL);
uint items_width = size.width - (scroll ? NWidgetScrollbar::GetVerticalDimension().width : 0);
NWidgetCore *nwi = this->GetWidget<NWidgetCore>(WID_DM_ITEMS);
nwi->SetMinimalSize(items_width, size.height + 4);
nwi->colour = wi_colour;
nwi = this->GetWidget<NWidgetCore>(WID_DM_SCROLL);
nwi->colour = wi_colour;
this->GetWidget<NWidgetStacked>(WID_DM_SHOW_SCROLL)->SetDisplayedPlane(scroll ? 0 : SZSP_NONE);
this->FinishInitNested(0);
CLRBITS(this->flags, WF_WHITE_BORDER);
/* Total length of list */
int list_height = 0;
for (const DropDownListItem * const *it = list->Begin(); it != list->End(); ++it) {
const DropDownListItem *item = *it;
list_height += item->Height(items_width);
}
/* Capacity is the average number of items visible */
this->vscroll->SetCapacity(size.height * (uint16)list->Length() / list_height);
this->vscroll->SetCount((uint16)list->Length());
this->parent_wnd_class = parent->window_class;
this->parent_wnd_num = parent->window_number;
this->parent_button = button;
this->list = list;
this->selected_index = selected;
this->click_delay = 0;
this->drag_mode = instant_close;
this->instant_close = instant_close;
this->left_button_state = _left_button_down;
}
/**
* 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);
}