/**
* Show a drop down list.
* @param w Parent window for the list.
* @param list Prepopulated DropDownList. Will be deleted when the list is
* closed.
* @param selected The initially selected list item.
* @param button The widget which is passed to Window::OnDropdownSelect and OnDropdownClose.
* Unless you override those functions, this should be then widget index of the dropdown button.
* @param wi_rect Coord of the parent drop down button, used to position the dropdown menu.
* @param auto_width The width is determined by the widest item in the list,
* in this case only one of \a left or \a right is used (depending on text direction).
* @param instant_close Set to true if releasing mouse button should close the
* list regardless of where the cursor is.
*/
void ShowDropDownListAt(Window *w, DropDownList *list, int selected, int button, Rect wi_rect, Colours wi_colour, bool auto_width, bool instant_close)
{
DeleteWindowById(WC_DROPDOWN_MENU, 0);
/* The preferred position is just below the dropdown calling widget */
int top = w->top + wi_rect.bottom + 1;
/* The preferred width equals the calling widget */
uint width = wi_rect.right - wi_rect.left + 1;
uint max_item_width = 0;
if (auto_width) {
/* Find the longest item in the list */
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
const DropDownListItem *item = *it;
max_item_width = max(max_item_width, item->Width() + 5);
}
}
/* Total length of list */
int list_height = 0;
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
DropDownListItem *item = *it;
list_height += item->Height(width);
}
/* Height of window visible */
int height = list_height;
/* Check if the status bar is visible, as we don't want to draw over it */
int screen_bottom = GetMainViewBottom();
bool scroll = false;
/* Check if the dropdown will fully fit below the widget */
if (top + height + 4 >= screen_bottom) {
/* If not, check if it will fit above the widget */
if (w->top + wi_rect.top - height > GetMainViewTop()) {
top = w->top + wi_rect.top - height - 4;
} else {
/* ... and lastly if it won't, enable the scroll bar and fit the
* list in below the widget */
int avg_height = list_height / (int)list->size();
int rows = (screen_bottom - 4 - top) / avg_height;
height = rows * avg_height;
scroll = true;
/* Add space for the scroll bar if we automatically determined
* the width of the list. */
max_item_width += NWidgetScrollbar::GetVerticalDimension().width;
}
}
if (auto_width) width = max(width, max_item_width);
Point dw_pos = { w->left + (_current_text_dir == TD_RTL ? wi_rect.right + 1 - width : wi_rect.left), top};
Dimension dw_size = {width, height};
new DropdownWindow(w, list, selected, button, instant_close, dw_pos, dw_size, wi_colour, scroll);
}
/**
* 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, DropDownList *list, int selected, int button, bool instant_close, const Point &position, const Dimension &size, Colours wi_colour, bool scroll) : Window()
{
this->position = position;
this->CreateNestedTree(&_dropdown_desc);
this->vscroll = this->GetScrollbar(DDM_SCROLL);
uint items_width = size.width - (scroll ? WD_VSCROLLBAR_WIDTH : 0);
NWidgetCore *nwi = this->GetWidget<NWidgetCore>(DDM_ITEMS);
nwi->SetMinimalSize(items_width, size.height + 4);
nwi->colour = wi_colour;
nwi = this->GetWidget<NWidgetCore>(DDM_SCROLL);
nwi->colour = wi_colour;
this->GetWidget<NWidgetStacked>(DDM_SHOW_SCROLL)->SetDisplayedPlane(scroll ? 0 : SZSP_NONE);
this->FinishInitNested(&_dropdown_desc, 0);
this->flags4 &= ~WF_WHITE_BORDER_MASK;
/* Total length of list */
int list_height = 0;
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
DropDownListItem *item = *it;
list_height += item->Height(items_width);
}
/* Capacity is the average number of items visible */
this->vscroll->SetCapacity(size.height * (uint16)list->size() / list_height);
this->vscroll->SetCount((uint16)list->size());
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 = true;
this->instant_close = instant_close;
}
void ShowDropDownList(Window *w, DropDownList *list, int selected, int button, uint width, bool auto_width, bool instant_close)
{
DeleteWindowById(WC_DROPDOWN_MENU, 0);
/* Our parent's button widget is used to determine where to place the drop
* down list window. */
Rect wi_rect;
Colours wi_colour;
NWidgetCore *nwi = w->GetWidget<NWidgetCore>(button);
wi_rect.left = nwi->pos_x;
wi_rect.right = nwi->pos_x + nwi->current_x - 1;
wi_rect.top = nwi->pos_y;
wi_rect.bottom = nwi->pos_y + nwi->current_y - 1;
wi_colour = nwi->colour;
if (nwi->type == NWID_BUTTON_DROPDOWN) {
nwi->disp_flags |= ND_DROPDOWN_ACTIVE;
} else {
w->LowerWidget(button);
}
w->SetWidgetDirty(button);
/* The preferred position is just below the dropdown calling widget */
int top = w->top + wi_rect.bottom + 1;
if (width == 0) width = wi_rect.right - wi_rect.left + 1;
uint max_item_width = 0;
if (auto_width) {
/* Find the longest item in the list */
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
const DropDownListItem *item = *it;
max_item_width = max(max_item_width, item->Width() + 5);
}
}
/* Total length of list */
int list_height = 0;
for (DropDownList::const_iterator it = list->begin(); it != list->end(); ++it) {
DropDownListItem *item = *it;
list_height += item->Height(width);
}
/* Height of window visible */
int height = list_height;
/* Check if the status bar is visible, as we don't want to draw over it */
int screen_bottom = GetMainViewBottom();
bool scroll = false;
/* Check if the dropdown will fully fit below the widget */
if (top + height + 4 >= screen_bottom) {
/* If not, check if it will fit above the widget */
if (w->top + wi_rect.top - height > GetMainViewTop()) {
top = w->top + wi_rect.top - height - 4;
} else {
/* ... and lastly if it won't, enable the scroll bar and fit the
* list in below the widget */
int avg_height = list_height / (int)list->size();
int rows = (screen_bottom - 4 - top) / avg_height;
height = rows * avg_height;
scroll = true;
/* Add space for the scroll bar if we automatically determined
* the width of the list. */
max_item_width += WD_VSCROLLBAR_WIDTH;
}
}
if (auto_width) width = max(width, max_item_width);
Point dw_pos = { w->left + (_current_text_dir == TD_RTL ? wi_rect.right + 1 - width : wi_rect.left), top};
Dimension dw_size = {width, height};
new DropdownWindow(w, list, selected, button, instant_close, dw_pos, dw_size, wi_colour, scroll);
}
