carousel_scroll_strategy.hpp

#pragma once
 
#include "qml_material/carousel/carousel_keylines.hpp"
#include "qml_material/carousel/carousel_strategy.hpp"
 
namespace qml_material
{
 
enum class HeroScrollZone
{
    Leading,
    Middle,
    TrailingLerp,
    TrailingRest,
};
 
struct CarouselScrollStrategy {
    KeylineList          default_keylines;
    QVector<KeylineList> start_steps;
    QVector<KeylineList> end_steps;
    qreal                start_shift_distance = 0;
    qreal                end_shift_distance   = 0;
    bool                 hero_lerp            = false;
    bool                 keep_leading_peek    = false;
    qreal                viewport_size        = 0;
 
    static auto build(const KeylineList& default_keylines, qreal carousel_main_axis_size)
        -> CarouselScrollStrategy;
 
    static auto build(const CarouselLayoutInput& in, const KeylineList& default_keylines)
        -> CarouselScrollStrategy;
 
    static auto buildHero(const CarouselLayoutInput& in, bool keep_leading_peek,
                          const QVector<qreal>& snap_offsets, qreal max_scroll_offset)
        -> CarouselScrollStrategy;
 
    auto keylinesForScrollOffset(qreal scroll_offset, qreal max_scroll_offset,
                                 bool round_to_step = false) const -> KeylineList;
 
    auto zoneFor(qreal scroll_offset, qreal keyline_max) const -> HeroScrollZone;
};
 
} // namespace qml_material