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refactoring of listbox

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This commit is contained in:
Jinhao 2018-11-05 01:33:36 +08:00
parent b87d17cac1
commit ee419c8885
1 changed files with 18 additions and 11 deletions
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29
source/gui/widgets/listbox.cpp
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@ -1974,7 +1974,6 @@ namespace nana
msup_deselect
};
/// created and live by the trigger, holds data for listbox: the state of the struct does not effect on member funcions, therefore all data members are public.
struct essence
{
@ -2295,16 +2294,16 @@ namespace nana
return header.range(seq.front()).first + r.x - this->content_view->origin().x;
}
//Returns the absolute coordinate of the specified item in the window
point item_coordinate(const index_pair& pos) const
//Returns the top of the specified item in listbox window.
int item_window_top(const index_pair& pos) const
{
auto top = static_cast<int>(this->lister.distance(index_pair{}, pos) * item_height()) - content_view->origin().y;
int top = static_cast<int>(this->lister.distance(index_pair{}, pos) * item_height()) - content_view->origin().y;
rectangle r;
if (rect_lister(r))
top += r.y;
return{ top, top + static_cast<int>(item_height()) };
return top;
}
std::pair<parts, size_t> where(const nana::point& pos) const noexcept
@ -4247,13 +4246,21 @@ namespace nana
//adjust the display of selected into the list rectangle if the part of the item is beyond the top/bottom edge
if (good_list_r)
{
auto item_coord = this->essence_->item_coordinate(abs_item_pos); //item_coord.x = top, item_coord.y = bottom
if (item_coord.x < list_r.y && list_r.y < item_coord.y)
essence_->content_view->move_origin({ 0, item_coord.x - list_r.y });
else if (item_coord.x < list_r.bottom() && list_r.bottom() < item_coord.y)
essence_->content_view->move_origin({ 0, item_coord.y - list_r.bottom() });
auto const item_top = this->essence_->item_window_top(abs_item_pos);
auto const item_bottom = item_top + static_cast<int>(essence_->item_height());
essence_->content_view->sync(false);
int move_top = 0;
if (item_top < list_r.y && list_r.y < item_bottom)
move_top = item_top - list_r.y;
else if (item_top < list_r.bottom() && list_r.bottom() < item_bottom)
move_top = item_bottom - list_r.bottom();
if (0 != move_top)
{
essence_->content_view->move_origin({ 0, move_top });
essence_->content_view->sync(false);
}
}
bool new_selected_status = true;