view_model.hpp

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#pragma once
 
#include "aria/abi/export.hpp"
#include "aria/property.hpp"
#include "aria/subscription.hpp"
 
#include <functional>
#include <memory>
#include <vector>
 
namespace aria::binding {

#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251)
#endif
class ARIA_BINDING_API ViewModel : public std::enable_shared_from_this<ViewModel> {
public:
    ViewModel();
    virtual ~ViewModel();

    [[nodiscard]] Property<bool>& is_active();
    [[nodiscard]] const Property<bool>& is_active() const;
 
    virtual void on_activate() {}
    virtual void on_deactivate() {}
 
    void activate();
    void deactivate();
 
    void add_child(std::shared_ptr<ViewModel> child);

    void track(Subscription sub);
 
    void add_destroy_hook(std::function<void()> hook);
 
protected:
    [[nodiscard]] SubscriptionBag& bag();
 
private:
    struct Impl;
    std::unique_ptr<Impl> impl_;
};
#ifdef _MSC_VER
#pragma warning(pop)
#endif

using IViewModel = ViewModel;
 
}  // namespace aria::binding