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Allow dropdown to be drawn above the origin widget, even in the case the dropdown needs a scrollbar.

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This commit is contained in:
Juanjo
2013-07-06 22:08:58 +02:00
committed by pelya
parent 02d035fbef
commit 2959bcdbe7
1 changed files with 32 additions and 13 deletions
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45
src/widgets/dropdown.cpp
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@@ -334,10 +334,10 @@ void ShowDropDownListAt(Window *w, const DropDownList *list, int selected, int b
{
DeleteWindowById(WC_DROPDOWN_MENU, 0);
/* The preferred position is just below the dropdown calling widget */
/* 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 */
/* The preferred width equals the calling widget. */
uint width = wi_rect.right - wi_rect.left + 1;
uint max_item_width = 0;
@@ -350,7 +350,7 @@ void ShowDropDownListAt(Window *w, const DropDownList *list, int selected, int b
}
}
/* Total length of list */
/* Total length of list. */
int list_height = 0;
for (const DropDownListItem * const *it = list->Begin(); it != list->End(); ++it) {
@@ -358,28 +358,47 @@ void ShowDropDownListAt(Window *w, const DropDownList *list, int selected, int b
list_height += item->Height(width);
}
/* Height of window visible */
/* Height of the dropdown window; by default, the total length of the list. */
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 */
/* 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()) {
/* If not, check if it will fit above the widget. */
int screen_top = GetMainViewTop();
if (w->top + wi_rect.top > screen_top + height) {
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 */
/* If it doesn't fit above the widget, we need to enable a scrollbar... */
int avg_height = list_height / (int)list->Length();
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. */
/* ... and choose whether to put the list above or below the widget. */
bool put_above = false;
int available_height = screen_bottom - w->top - wi_rect.bottom;
if (w->top + wi_rect.top - screen_top > available_height) {
// Put it above.
available_height = w->top + wi_rect.top - screen_top;
put_above = true;
}
/* Check at least there is space for one item. */
assert(available_height >= avg_height);
/* And lastly, fit the list,... */
int rows = available_height / avg_height;
height = rows * avg_height;
/* ... add space for the scrollbar,... */
max_item_width += NWidgetScrollbar::GetVerticalDimension().width;
/* ... and set the top position if needed. */
if (put_above) {
top = w->top + wi_rect.top - height - 4;
}
}
}