color_picker.hpp

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#pragma once
 
#include <pulp/view/view.hpp>
#include <pulp/view/theme_contrast.hpp>
#include <functional>
#include <vector>
 
namespace pulp::view {
 
// ── ColorPicker ─────────────────────────────────────────────────────────────
// HSL/HSB/hex color selection with swatches.
 
class ColorPicker : public View {
public:
    ColorPicker();

    void set_color(Color c);
    Color color() const { return color_; }

    void set_hsl(HSL hsl);
    HSL hsl() const { return hsl_; }

    void set_hex(const std::string& hex);
    std::string hex() const;

    std::function<void(Color)> on_change;

    void set_swatches(std::vector<Color> swatches);
    const std::vector<Color>& swatches() const { return swatches_; }

    enum class Mode { hsl, hsb, hex_only };
    void set_mode(Mode m) { mode_ = m; }
    Mode mode() const { return mode_; }

    void set_show_alpha(bool show) { show_alpha_ = show; }
    bool show_alpha() const { return show_alpha_; }
 
    void paint(canvas::Canvas& canvas) override;
    void on_mouse_down(Point pos) override;
    void on_mouse_up(Point pos) override;
    void on_mouse_drag(Point pos) override;
    void on_mouse_event(const MouseEvent& event) override;
    bool wants_mouse_input() const override { return true; }
 
    float intrinsic_height() const override { return 260.0f; }
 
private:
    Color color_{};
    HSL hsl_{};
    Mode mode_ = Mode::hsl;
    bool show_alpha_ = false;
    std::vector<Color> swatches_;
 
    enum class DragTarget { none, saturation_lightness, hue, alpha, swatch };
    DragTarget drag_target_ = DragTarget::none;
 
    Rect sl_area() const;      // Saturation/Lightness square
    Rect hue_bar() const;      // Hue slider bar
    Rect alpha_bar() const;    // Alpha slider bar
    Rect swatch_area() const;  // Swatch grid area
 
    void update_from_hsl();
    void update_from_color();
};
 
} // namespace pulp::view