appearance_tracker.hpp

Go to the documentation of this file.

#pragma once
 
#include <pulp/view/theme.hpp>
#include <functional>
#include <string>
#include <memory>
 
namespace pulp::view {

enum class Appearance { light, dark };

enum class ThemeMode { system, light, dark };

class AppearanceTracker {
public:
    AppearanceTracker();
    ~AppearanceTracker();

    Appearance current_appearance() const;

    bool poll();

    void on_appearance_changed(std::function<void(Appearance)> callback);

    void lock(Appearance appearance);

    void unlock();

    bool is_locked() const { return locked_; }

    Appearance locked_appearance() const { return locked_appearance_; }
 
private:
    Appearance last_known_ = Appearance::dark;
    bool locked_ = false;
    Appearance locked_appearance_ = Appearance::dark;
    std::function<void(Appearance)> callback_;

    static Appearance detect_system_appearance();
};

class ThemeManager {
public:
    ThemeManager();

    void set_theme_pair(Theme light_theme, Theme dark_theme);

    const Theme& active_theme() const;

    void lock_theme(Theme theme);

    void lock_appearance(Appearance appearance);

    void unlock();

    void set_mode(ThemeMode m);
    ThemeMode mode() const;

    bool is_locked() const { return theme_locked_ || tracker_.is_locked(); }

    AppearanceTracker& tracker() { return tracker_; }
    const AppearanceTracker& tracker() const { return tracker_; }

    bool poll();

    void on_theme_changed(std::function<void(const Theme&)> callback);
 
private:
    AppearanceTracker tracker_;
    Theme light_theme_;
    Theme dark_theme_;
    Theme locked_theme_;
    bool theme_locked_ = false;
    std::function<void(const Theme&)> theme_callback_;
};
 
} // namespace pulp::view