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modifiable mouse wheel scroll step

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This commit is contained in:
Jinhao
2016-06-27 10:36:08 +08:00
parent 3cf10ef940
commit a8219fe760
7 changed files with 60 additions and 28 deletions
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21
source/gui/widgets/listbox.cpp
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@@ -2147,8 +2147,17 @@ namespace nana
}
/// directly set a tested relative display pos
void set_scroll_y_dpl(const index_pair& pos_dpl)
void set_scroll_y_dpl(index_pair pos_dpl)
{
if (lister.first() != pos_dpl)
{
//check the pos_dpl to make sure the last item is at bottom of listbox
const auto numbers = this->number_of_lister_items(false);
const auto distance = lister.distance(pos_dpl, lister.last());
if (numbers > 1 && distance < numbers)
lister.backward(lister.last(), numbers - 1, pos_dpl);
}
scroll.offset_y_dpl = pos_dpl;
if (pos_dpl.is_category())
scroll.offset_y_abs = pos_dpl;
@@ -2161,7 +2170,7 @@ namespace nana
//number_of_lister_item
/// @brief Returns the number of items that are contained in pixels
/// @brief Returns the number of items that are contained on screen.
/// @param with_rest: Means whether including extra one item that is not completely contained in reset pixels.
size_type number_of_lister_items(bool with_rest) const
{
@@ -2509,11 +2518,11 @@ namespace nana
if(scroll.v.empty() || !scroll.v.scrollable(upwards))
return false;
index_pair target;
if(upwards == false)
lister.forward(scroll.offset_y_dpl, 1, target);
index_pair target; //index for display
if (upwards == false)
lister.forward(scroll.offset_y_dpl, this->scheme_ptr->mouse_wheel.lines, target);
else
lister.backward(scroll.offset_y_dpl, 1, target);
lister.backward(scroll.offset_y_dpl, this->scheme_ptr->mouse_wheel.lines, target);
if (target == scroll.offset_y_dpl)
return false;