Scrollbar

A standalone scrollbar reports an offset; the application draws or moves content. Lists and multiline inputs already manage their own scrollbars.

#include <wui/control/scroll.hpp>

auto bar = std::make_shared<wui::scroll>(1000, 0,
    wui::orientation::vertical,
    [](wui::scroll_state state, int32_t offset) {
        // Update the application's visible content for this offset.
    });
window->add_control(bar, {300, 50, 314, 350});

scroll(int32_t area, int32_t scroll_pos,
       orientation orientation = orientation::vertical,
       std::function<void(scroll_state, int32_t)> callback = nullptr,
       std::string_view theme_control_name = tc,
       std::shared_ptr<i_theme> theme = nullptr);

void set_area(int32_t area);
    void set_scroll_pos(int32_t scroll_pos);
    int32_t get_scroll_pos() const;

    /// Good to call from mouse whell event
    void scroll_up();
    void scroll_down();

States: activated, relaxed, up_end, down_end, moving. get_scroll_view() reports full: the scrollbar keeps its full width and visible thumb without requiring hover. Theme section scroll uses background, slider, slider_active.