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Codechange: Move DropDownList height and width calculation to helper.

pull/11459/head
Peter Nelson 2023-11-12 08:08:30 +00:00 committed by Peter Nelson
parent 1242b355e5
commit 08dfe35442
2 changed files with 28 additions and 21 deletions
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47
src/widgets/dropdown.cpp
View File

@ -335,6 +335,21 @@ struct DropdownWindow : Window {
}
};
/**
* Determine width and height required to fully display a DropDownList
* @param list The list.
* @return Dimension required to display the list.
*/
Dimension GetDropDownListDimension(const DropDownList &list)
{
Dimension dim{};
for (const auto &item : list) {
dim.height += item->Height();
dim.width = std::max(dim.width, item->Width());
}
return dim;
}
/**
* Show a drop down list.
* @param w Parent window for the list.
@ -356,18 +371,9 @@ void ShowDropDownListAt(Window *w, DropDownList &&list, int selected, int button
/* The preferred width equals the calling widget */
uint width = wi_rect.Width();
/* Longest item in the list */
uint max_item_width = 0;
/* Total height of list */
uint height = 0;
for (const auto &item : list) {
height += item->Height();
max_item_width = std::max(max_item_width, item->Width());
}
max_item_width += WidgetDimensions::scaled.fullbevel.Horizontal();
/* Get the height and width required for the list. */
Dimension dim = GetDropDownListDimension(list);
dim.width += WidgetDimensions::scaled.fullbevel.Horizontal();
/* Scrollbar needed? */
bool scroll = false;
@ -379,7 +385,7 @@ void ShowDropDownListAt(Window *w, DropDownList &&list, int selected, int button
uint available_height = std::max(GetMainViewBottom() - top - (int)WidgetDimensions::scaled.fullbevel.Vertical() * 2, 0);
/* If the dropdown doesn't fully fit below the widget... */
if (height > available_height) {
if (dim.height > available_height) {
uint available_height_above = std::max(w->top + wi_rect.top - GetMainViewTop() - (int)WidgetDimensions::scaled.fullbevel.Vertical() * 2, 0);
@ -390,29 +396,28 @@ void ShowDropDownListAt(Window *w, DropDownList &&list, int selected, int button
}
/* If the dropdown doesn't fully fit, we need a dropdown. */
if (height > available_height) {
if (dim.height > available_height) {
scroll = true;
uint avg_height = height / (uint)list.size();
uint avg_height = dim.height / (uint)list.size();
/* Fit the list; create at least one row, even if there is no height available. */
uint rows = std::max<uint>(available_height / avg_height, 1);
height = rows * avg_height;
dim.height = rows * avg_height;
/* Add space for the scrollbar. */
max_item_width += NWidgetScrollbar::GetVerticalDimension().width;
dim.width += NWidgetScrollbar::GetVerticalDimension().width;
}
/* Set the top position if needed. */
if (above) {
top = w->top + wi_rect.top - height - WidgetDimensions::scaled.fullbevel.Vertical() * 2;
top = w->top + wi_rect.top - dim.height - WidgetDimensions::scaled.fullbevel.Vertical() * 2;
}
}
width = std::max(width, max_item_width);
dim.width = std::max(width, dim.width);
Point dw_pos = { w->left + (_current_text_dir == TD_RTL ? wi_rect.right + 1 - (int)width : wi_rect.left), top};
Dimension dw_size = {width, height};
DropdownWindow *dropdown = new DropdownWindow(w, std::move(list), selected, button, instant_close, dw_pos, dw_size, wi_colour, scroll);
DropdownWindow *dropdown = new DropdownWindow(w, std::move(list), selected, button, instant_close, dw_pos, dim, wi_colour, scroll);
/* The dropdown starts scrolling downwards when opening it towards
* the top and holding down the mouse button. It can be fooled by

2
src/widgets/dropdown_type.h
View File

@ -76,4 +76,6 @@ void ShowDropDownListAt(Window *w, DropDownList &&list, int selected, int button
void ShowDropDownList(Window *w, DropDownList &&list, int selected, int button, uint width = 0, bool instant_close = false);
Dimension GetDropDownListDimension(const DropDownList &list);
#endif /* WIDGETS_DROPDOWN_TYPE_H */