118 lines
2.1 KiB
C++
118 lines
2.1 KiB
C++
#include <psemek/ui/slider.hpp>
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namespace psemek::ui
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{
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bool slider::on_event(mouse_move const & e)
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{
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bool const over = shape().contains(geom::cast<float>(e.position));
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mouse_x_ = e.position[0];
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switch (state_) {
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case state_t::normal:
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if (over)
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{
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state_ = state_t::mouseover;
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on_state_changed(state_t::normal);
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}
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break;
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case state_t::mouseover:
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if (!over)
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{
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state_ = state_t::normal;
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on_state_changed(state_t::mouseover);
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}
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break;
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case state_t::mousedown:
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if (mouse_x_)
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set_value(compute_value(*mouse_x_));
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break;
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}
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return false;
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}
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bool slider::on_event(mouse_click const & e)
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{
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if (e.button != mouse_button::left) return false;
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switch (state_) {
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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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state_ = state_t::mousedown;
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if (mouse_x_)
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set_value(compute_value(*mouse_x_));
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on_state_changed(state_t::mouseover);
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return 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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state_ = state_t::mouseover;
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on_state_changed(state_t::mousedown);
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return true;
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}
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break;
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}
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return false;
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}
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bool slider::on_event(mouse_wheel const & e)
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{
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if (state_ == state_t::mouseover)
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{
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set_value(value_ + e.delta);
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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 slider::set_value_range(geom::interval<int> i)
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{
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if (i.empty()) throw std::runtime_error("Empty value range for ui::slider");
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value_range_ = i;
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set_value(value_);
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}
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void slider::set_value(int v)
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{
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v = geom::clamp(v, value_range_);
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if (value_ != v)
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{
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value_ = v;
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post_value_changed();
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}
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}
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void slider::on_value_changed(on_value_changed_callback callback)
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{
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callback_ = std::move(callback);
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post_value_changed();
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}
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geom::interval<float> slider::slider_range() const
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{
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return shape().bbox()[0];
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}
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void slider::post_value_changed()
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{
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if (callback_)
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post([cb = callback_, value = value_]{
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cb(value);
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});
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}
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int slider::compute_value(int x) const
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{
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auto const range = slider_range();
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return std::round(geom::unlerp(range, x * 1.f) * value_range_.length()) + value_range_.min;
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}
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}
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