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Support on_scroll event in ui::scroller

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This commit is contained in:
Nikita Lisitsa 2022-05-03 14:24:14 +03:00
parent 3760741ba6
commit b5145b9596
2 changed files with 11 additions and 0 deletions
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2
libs/ui/include/psemek/ui/scroller.hpp
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@ -40,6 +40,8 @@ namespace psemek::ui
protected: protected:
virtual void on_scroll(geom::vector<float, 2> const & delta);
virtual float width() const; virtual float width() const;
virtual geom::box<float, 2> visible_range() const; virtual geom::box<float, 2> visible_range() const;

9
libs/ui/source/scroller.cpp
View file

@ -53,8 +53,10 @@ namespace psemek::ui
float c = geom::unlerp<float>(box[0], e.position[0]); float c = geom::unlerp<float>(box[0], e.position[0]);
c = geom::clamp(c, {0.f, 1.f}); c = geom::clamp(c, {0.f, 1.f});
auto old = shift_tgt_;
shift_tgt_[0] = shape_.box[0].length() / 2.f - c * sc[0].min; shift_tgt_[0] = shape_.box[0].length() / 2.f - c * sc[0].min;
clamp_shift(); clamp_shift();
on_scroll(shift_tgt_ - old);
} }
break; break;
} }
@ -85,8 +87,10 @@ namespace psemek::ui
float c = geom::unlerp<float>(box[1], e.position[1]); float c = geom::unlerp<float>(box[1], e.position[1]);
c = geom::clamp(c, {0.f, 1.f}); c = geom::clamp(c, {0.f, 1.f});
auto old = shift_tgt_;
shift_tgt_[1] = shape_.box[1].length() / 2.f - c * sc[1].min; shift_tgt_[1] = shape_.box[1].length() / 2.f - c * sc[1].min;
clamp_shift(); clamp_shift();
on_scroll(shift_tgt_ - old);
} }
break; break;
} }
@ -182,8 +186,10 @@ namespace psemek::ui
delta[0] = e.delta; delta[0] = e.delta;
} }
auto old = shift_tgt_;
shift_tgt_ += delta * 50.f; shift_tgt_ += delta * 50.f;
clamp_shift(); clamp_shift();
on_scroll(shift_tgt_ - old);
post_reshape(); post_reshape();
return true; return true;
} }
@ -291,6 +297,9 @@ namespace psemek::ui
p.end_stencil(); p.end_stencil();
} }
void scroller::on_scroll(geom::vector<float, 2> const &)
{}
float scroller::width() const float scroller::width() const
{ {
return 0; return 0;