368 lines
7.5 KiB
C++
368 lines
7.5 KiB
C++
#include <psemek/ui/scroller.hpp>
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#include <psemek/geom/contains.hpp>
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namespace psemek::ui
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{
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void scroller::set_preferred_direction(direction d)
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{
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preferred_direction_ = d;
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}
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bool scroller::set_horizontal_scroll(bool enabled)
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{
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std::swap(horizontal_, enabled);
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return enabled;
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}
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bool scroller::set_vertical_scroll(bool enabled)
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{
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std::swap(vertical_, enabled);
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return enabled;
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}
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bool scroller::on_event(mouse_move const & e)
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{
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mouse_ = e.position;
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auto pos = geom::cast<float>(e.position);
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if (horizontal_scroll())
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{
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auto box = horizontal_box();
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bool over = geom::contains(box, pos);
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switch (horizontal_state_)
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{
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case state_t::normal:
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if (over)
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horizontal_state_ = state_t::mouseover;
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break;
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case state_t::mouseover:
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if (!over)
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horizontal_state_ = state_t::normal;
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break;
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case state_t::mousedown:
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{
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if (!child_)
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return false;
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auto sc = child_->size_constraints();
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float c = geom::unlerp<float>(box[0], e.position[0]);
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c = geom::clamp(c, {0.f, 1.f});
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auto old = shift_tgt_;
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shift_tgt_[0] = shape_.box[0].length() / 2.f - c * sc[0].min;
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clamp_shift();
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on_scroll(shift_tgt_ - old);
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}
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break;
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}
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}
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if (vertical_scroll())
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{
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auto box = vertical_box();
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bool over = geom::contains(box, pos);
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switch (vertical_state_)
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{
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case state_t::normal:
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if (over)
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vertical_state_ = state_t::mouseover;
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break;
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case state_t::mouseover:
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if (!over)
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vertical_state_ = state_t::normal;
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break;
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case state_t::mousedown:
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{
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if (!child_)
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return false;
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auto sc = child_->size_constraints();
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float c = geom::unlerp<float>(box[1], e.position[1]);
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c = geom::clamp(c, {0.f, 1.f});
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auto old = shift_tgt_;
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shift_tgt_[1] = shape_.box[1].length() / 2.f - c * sc[1].min;
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clamp_shift();
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on_scroll(shift_tgt_ - old);
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}
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break;
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}
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}
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return false;
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}
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bool scroller::on_event(mouse_click const & e)
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{
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if (e.button != mouse_button::left)
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return false;
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bool result = false;
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if (horizontal_scroll())
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{
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switch (horizontal_state_)
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{
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case state_t::normal:
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break;
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case state_t::mouseover:
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if (e.down)
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{
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horizontal_state_ = state_t::mousedown;
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result = true;
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}
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break;
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case state_t::mousedown:
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if (!e.down)
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{
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horizontal_state_ = state_t::mouseover;
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result = true;
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}
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break;
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}
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}
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if (vertical_scroll())
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{
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switch (vertical_state_)
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{
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case state_t::normal:
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break;
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case state_t::mouseover:
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if (e.down)
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{
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vertical_state_ = state_t::mousedown;
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result = true;
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}
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break;
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case state_t::mousedown:
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if (!e.down)
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{
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vertical_state_ = state_t::mouseover;
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result = true;
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}
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break;
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}
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}
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return result;
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}
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bool scroller::on_event(mouse_wheel const & e)
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{
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if (mouse_ && geom::contains(shape_.box, geom::cast<float>(*mouse_)))
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{
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geom::vector<float, 2> delta = {0.f, 0.f};
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auto pos = geom::cast<float>(*mouse_);
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auto vcontains = geom::contains(vertical_box(), pos);
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auto hcontains = geom::contains(horizontal_box(), pos);
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if (vertical_scroll() && horizontal_scroll())
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{
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if (vcontains)
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delta[1] = e.delta;
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else if (hcontains)
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delta[0] = e.delta;
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else if (preferred_direction() == direction::vertical)
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delta[1] = e.delta;
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else
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delta[0] = e.delta;
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}
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else if (vertical_scroll())
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{
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delta[1] = e.delta;
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}
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else if (horizontal_scroll())
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{
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delta[0] = e.delta;
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}
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auto old = shift_tgt_;
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shift_tgt_ += delta * 50.f;
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clamp_shift();
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on_scroll(shift_tgt_ - old);
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post_reshape();
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return true;
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}
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return false;
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}
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void scroller::reshape(geom::box<float, 2> const & bbox)
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{
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shape_.box = bbox;
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auto st = merged_own_style();
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if (child_)
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{
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auto child_constraints = child_->size_constraints();
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auto child_bbox = bbox;
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if (horizontal_scroll())
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child_bbox[1].max -= width() * *st->scale;
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if (vertical_scroll())
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child_bbox[0].max -= width() * *st->scale;
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if (horizontal_scroll())
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{
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horizontal_stick_ |= child_bbox[0].length() > child_constraints[0].min;
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if (horizontal_stick_)
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{
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shift_tgt_[0] = std::min(child_bbox[0].length() - child_constraints[0].min, 0.f);
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shift_[0] = shift_tgt_[0];
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}
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child_bbox[0].min += shift_[0];
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child_bbox[0].max = child_bbox[0].min + child_constraints[0].min;
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}
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if (vertical_scroll())
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{
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vertical_stick_ |= child_bbox[1].length() > child_constraints[1].min;
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if (vertical_stick_)
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{
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shift_tgt_[1] = std::min(child_bbox[1].length() - child_constraints[1].min, 0.f);
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shift_[1] = shift_tgt_[1];
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}
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child_bbox[1].min += shift_[1];
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child_bbox[1].max = child_bbox[1].min + child_constraints[1].min;
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}
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child_->reshape(child_bbox);
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}
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}
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geom::box<float, 2> scroller::size_constraints() const
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{
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geom::box<float, 2> result;
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result[0] = {0.f, std::numeric_limits<float>::infinity()};
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result[1] = {0.f, std::numeric_limits<float>::infinity()};
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if (child_)
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{
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auto child_constraints = child_->size_constraints();
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if (!horizontal_scroll())
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result[0] = child_constraints[0];
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if (!vertical_scroll())
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result[1] = child_constraints[1];
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}
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auto st = merged_own_style();
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if (horizontal_scroll())
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result[1].min = std::max<float>(result[1].min, width() * *st->scale);
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if (vertical_scroll())
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result[0].min = std::max<float>(result[0].min, width() * *st->scale);
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return result;
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}
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void scroller::update(float dt)
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{
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shift_ += (shift_tgt_ - shift_) * std::min(25.f * dt, 1.f);
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post_reshape();
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}
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void scroller::draw(painter & p) const
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{
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auto st = merged_own_style();
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float w = width() * *st->scale;
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auto box = shape_.box;
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if (horizontal_scroll())
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box[1].max -= w;
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if (vertical_scroll())
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box[0].max -= w;
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p.begin_stencil();
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p.draw_rect(box, {0, 0, 0, 255});
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p.commit_stencil();
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}
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void scroller::post_draw(painter & p) const
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{
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p.end_stencil();
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}
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void scroller::on_scroll(geom::vector<float, 2> const &)
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{}
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float scroller::width() const
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{
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return 0;
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}
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geom::box<float, 2> scroller::visible_range() const
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{
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if (!child_)
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return {{{0.f, 1.f}, {0.f, 1.f}}};
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geom::box<float, 2> result;
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auto c = child_->size_constraints();
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result[0] = {- shift_[0] / c[0].min, (shape_.box[0].length() - shift_[0]) / c[0].min};
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result[1] = {- shift_[1] / c[1].min, (shape_.box[1].length() - shift_[1]) / c[1].min};
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result[0].max = std::min(result[0].max, 1.f);
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result[1].max = std::min(result[1].max, 1.f);
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return result;
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}
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geom::box<float, 2> scroller::horizontal_box() const
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{
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auto box = shape_.box;
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float w = width() * *merged_own_style()->scale;
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box[1].min = box[1].max - w;
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if (vertical_scroll())
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box[0].max -= w;
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return box;
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}
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geom::box<float, 2> scroller::vertical_box() const
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{
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auto box = shape_.box;
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float w = width() * *merged_own_style()->scale;
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box[0].min = box[0].max - w;
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if (horizontal_scroll())
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box[1].max -= w;
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return box;
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}
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void scroller::clamp_shift()
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{
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if (!child_)
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return;
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auto c = child_->size_constraints();
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geom::vector<float, 2> min;
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min[0] = shape_.box[0].length() - c[0].min;
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min[1] = shape_.box[1].length() - c[1].min;
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shift_tgt_[0] = std::max(shift_tgt_[0], min[0]);
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horizontal_stick_ = (shift_tgt_[0] == min[0]) || (min[0] > 0.f);
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shift_tgt_[0] = std::min(shift_tgt_[0], 0.f);
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shift_tgt_[1] = std::max(shift_tgt_[1], min[1]);
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vertical_stick_ = (shift_tgt_[1] == min[1]) || (min[1] > 0.f);
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shift_tgt_[1] = std::min(shift_tgt_[1], 0.f);
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}
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}
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