83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
#pragma once
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#include <psemek/ui/single_container.hpp>
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#include <psemek/ui/box_shape.hpp>
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namespace psemek::ui
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{
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struct scroller
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: single_container
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{
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enum class direction
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{
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horizontal,
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vertical,
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};
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virtual direction preferred_direction() const { return preferred_direction_; }
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virtual void set_preferred_direction(direction d);
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virtual bool set_horizontal_scroll(bool enabled);
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virtual bool set_vertical_scroll(bool enabled);
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virtual bool horizontal_scroll() const { return horizontal_; }
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virtual bool vertical_scroll() const { return vertical_; }
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virtual math::box<float, 2> events_bbox() const override;
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virtual bool on_event(mouse_move const & e) override;
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virtual bool on_event(mouse_click const & e) override;
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virtual bool on_event(mouse_wheel const & e) override;
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struct shape const & shape() const override { return shape_; }
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void reshape(math::box<float, 2> const & bbox) override;
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math::box<float, 2> size_constraints() const override;
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math::interval<float> width_constraints(float height) const override;
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math::interval<float> height_constraints(float width) const override;
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virtual float position(direction dir) const;
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virtual void set_position(direction dir, float position, bool animate);
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void update(float dt) override;
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void draw(painter & p) const override;
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void post_draw(painter & p) const override;
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protected:
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virtual void on_scroll(math::vector<float, 2> const & delta);
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virtual float width() const;
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virtual math::box<float, 2> visible_range() const;
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virtual math::box<float, 2> horizontal_box() const;
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virtual math::box<float, 2> vertical_box() const;
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enum state_t
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{
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normal,
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mouseover,
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mousedown,
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};
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state_t vertical_state_ = state_t::normal;
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state_t horizontal_state_ = state_t::normal;
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private:
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box_shape shape_;
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std::optional<math::point<int, 2>> mouse_;
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direction preferred_direction_ = direction::vertical;
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bool horizontal_ = false;
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bool vertical_ = true;
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math::vector<float, 2> shift_{0.f, 0.f};
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math::vector<float, 2> shift_tgt_{0.f, 0.f};
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void clamp_shift();
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};
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}
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