OmaPhoto/src/UI/FilterSheet.h

#pragma once
#include "Document/EditorSession.h"
#include "UI/CameraRawSlider.h"
#include <QWidget>

class CurvesControls;
class PickerField;
class QButtonGroup;
class QCheckBox;
class QComboBox;
class QLabel;
class QProgressBar;
class QPushButton;
class QSlider;
class QVBoxLayout;
class SwatchButton;

// Swift's GradientMapControls: the gradient, both ends, Reverse.
class GradientMapControls : public QWidget {
    Q_OBJECT
public:
    // `pick` opens the picker: false for Shadows, true for Highlights.
    GradientMapControls(std::function<GradientMapSettings()> value, std::function<void(const GradientMapSettings &)> change,
                        std::function<void(bool)> pick, QWidget *parent = nullptr);
    // Shows the settings as they now stand.
    void synchronize();

private:
    QWidget *swatch(const QString &title, bool highlights, const std::function<void(bool)> &pick);

    const std::function<GradientMapSettings()> m_value;
    const std::function<void(const GradientMapSettings &)> m_change;
    QWidget *const m_gradient;
    QCheckBox *const m_reverse;
    std::vector<SwatchButton *> m_swatches;
};

// Swift's FilterSheet: the kind's settings, Preview, Cancel and OK.
class FilterSheet : public QWidget {
    Q_OBJECT
public:
    explicit FilterSheet(EditorSession &session, QWidget *parent = nullptr);
    ~FilterSheet() override;
    // Swift's resetting: that setting back to the filter's default.
    static FilterSettings resetting(const std::function<double &(FilterSettings &)> &key, FilterSettings settings);
    // Color Balance's tracks, each colour to its opposite.
    static CameraRawSliderTrack cyanRedTrack();
    static CameraRawSliderTrack magentaGreenTrack();
    static CameraRawSliderTrack yellowBlueTrack();

protected:
    bool eventFilter(QObject *watched, QEvent *event) override;

private:
    // Swift's control: a slider, an exact field and its unit.
    struct Control {
        std::function<double &(FilterSettings &)> key;
        double low;
        double high;
        int decimals;
        bool logarithmic;
        QSlider *slider;
        PickerField *field;
        QLabel *title;
        // A coloured track, as Camera Raw's; a double click resets.
        std::function<CameraRawSliderTrack(const FilterSettings &)> track;
    };
    // A slider's travel: thousandths of its range.
    static constexpr int travel = 1000;
    void control(const QString &title, std::function<double &(FilterSettings &)> key, double low, double high, const QString &unit,
                 int decimals, bool logarithmic, std::function<CameraRawSliderTrack(const FilterSettings &)> track = {});
    void showControl(Control &control, const FilterSettings &settings);
    // Swift's LabelWidthKey: every shown title as wide as the widest.
    void alignTitles();
    void reset(size_t index);
    void noise();
    // Vignette's colour and rows, Bloom / Glow's, Tonal Contrast's.
    void finishing(FilterKind kind);
    // Swift's ditherControls: style, sizes, tones, colours, shape.
    void dither();
    // Swift's scanlinesControls: lines, displacement, tone, colours.
    void scanlines();
    // The Colors menu, then Two Colors' dark and light swatches.
    void colorChoices(const QString &prefix, std::function<DitherColors &(FilterSettings &)> colors,
                      std::function<std::pair<AdjustmentColor, AdjustmentColor>(const FilterSettings &)> pair, const QString &darkHelp,
                      const QString &lightHelp);
    // A titled menu of choices: the row and its box.
    QComboBox *menu(const QString &title, const QString &name, const QString &help);
    // Remove Background's words, Quality, and Advanced's three rows.
    void background();
    // Black & White's six families and Tint; Color Balance's nine.
    void blackWhite();
    void colorBalance();
    // Swift's Toggle over a flag, with its help.
    void flag(const QString &title, const QString &help, std::function<bool &(FilterSettings &)> key);
    // Swift's headline over a group of rows.
    void headline(const QString &title);
    // Swift's `settings` and `update`: the defaults once the edit goes.
    FilterSettings settings() const;
    void update(const std::function<void(FilterSettings &)> &change);
    void synchronize();

    EditorSession &m_session;
    QVBoxLayout *const m_column;
    std::vector<Control> m_controls;
    CurvesControls *m_curves = nullptr;
    GradientMapControls *m_gradientMap = nullptr;
    SwatchButton *m_vignetteSwatch = nullptr;
    QButtonGroup *m_distribution = nullptr;
    QCheckBox *m_monochromatic = nullptr;
    QButtonGroup *m_quality = nullptr;
    std::vector<std::pair<QCheckBox *, std::function<bool &(FilterSettings &)>>> m_flags;
    // Rows under Swift's `if`: Advanced's, Tint's.
    std::vector<std::pair<QWidget *, std::function<bool(const FilterSettings &)>>> m_shownWhen;
    // Controls that show the settings as they stand: Dither's menus.
    std::vector<std::function<void(const FilterSettings &)>> m_follows;
    QCheckBox *const m_preview;
    QLabel *const m_error;
    QLabel *const m_limited;
    QProgressBar *const m_spinner;
    QLabel *const m_activity;
    QPushButton *const m_cancel;
    QPushButton *const m_ok;
    // The picker's colour as last seen, Swift's onChange.
    std::optional<PaletteColor> m_pickerColour;
};