JniAdapter.hpp

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#pragma once

 
#include "aria/abi/export.hpp"
#include "aria/binding/view_adapter.hpp"
#include "aria/subscription.hpp"
 
#include <jni.h>
 
#include <cstdint>
#include <functional>
#include <memory>
#include <string>
#include <string_view>
 
namespace aria::adapters::jni {
 
// ─── View wrapper ───────────────────────────────────────────────────────

class ARIA_JNI_API JniView : public ::aria::binding::IView {
public:
    JniView(JNIEnv* env, jobject view);
 
    ~JniView() override;
 
    JniView(const JniView&) = delete;
    JniView& operator=(const JniView&) = delete;

    [[nodiscard]] std::string_view kind() const noexcept override { return "android"; }

    [[nodiscard]] jobject native() const noexcept { return view_; }
 
private:
    JavaVM* vm_ = nullptr;   // cached to obtain a JNIEnv at destruction time
    jobject view_;           // JNI global reference
};
 
// ─── Adapter ────────────────────────────────────────────────────────────

class ARIA_JNI_API JniAdapter : public ::aria::binding::IViewAdapter {
public:
    explicit JniAdapter(JNIEnv* env);
 
    ~JniAdapter() override;
 
    JniAdapter(const JniAdapter&) = delete;
    JniAdapter& operator=(const JniAdapter&) = delete;
 
    [[nodiscard]] std::string_view platform_name() const noexcept override {
        return "android";
    }
 
    // ── Text ────────────────────────────────────────────────────────────
    void                 set_text(::aria::binding::IView& v, std::string_view text) override;
    [[nodiscard]] std::string get_text(::aria::binding::IView& v) override;
    ::aria::Subscription on_text_changed(::aria::binding::IView& v,
        std::function<void(std::string_view)> cb) override;
 
    // ── Bool ────────────────────────────────────────────────────────────
    void                 set_bool(::aria::binding::IView& v, bool value) override;
    [[nodiscard]] bool   get_bool(::aria::binding::IView& v) override;
    ::aria::Subscription on_bool_changed(::aria::binding::IView& v,
        std::function<void(bool)> cb) override;
 
    // ── Int ─────────────────────────────────────────────────────────────
    void                 set_int(::aria::binding::IView& v, int value) override;
    [[nodiscard]] int    get_int(::aria::binding::IView& v) override;
    ::aria::Subscription on_int_changed(::aria::binding::IView& v,
        std::function<void(int)> cb) override;
 
    void                 set_int64(::aria::binding::IView& v, std::int64_t value) override;
    [[nodiscard]] std::int64_t get_int64(::aria::binding::IView& v) override;
    ::aria::Subscription on_int64_changed(::aria::binding::IView& v,
        std::function<void(std::int64_t)> cb) override;
 
    void                 set_uint64(::aria::binding::IView& v, std::uint64_t value) override;
    [[nodiscard]] std::uint64_t get_uint64(::aria::binding::IView& v) override;
    ::aria::Subscription on_uint64_changed(::aria::binding::IView& v,
        std::function<void(std::uint64_t)> cb) override;
 
    void                 set_float(::aria::binding::IView& v, float value) override;
    [[nodiscard]] float  get_float(::aria::binding::IView& v) override;
    ::aria::Subscription on_float_changed(::aria::binding::IView& v,
        std::function<void(float)> cb) override;
 
    // ── Double ──────────────────────────────────────────────────────────
    void                 set_double(::aria::binding::IView& v, double value) override;
    [[nodiscard]] double get_double(::aria::binding::IView& v) override;
    ::aria::Subscription on_double_changed(::aria::binding::IView& v,
        std::function<void(double)> cb) override;
 
    // ── Visibility / enabled ────────────────────────────────────────────
    void                 set_visible(::aria::binding::IView& v, bool visible) override;
    void                 set_enabled(::aria::binding::IView& v, bool enabled) override;
 
    // ── Click ───────────────────────────────────────────────────────────
    ::aria::Subscription on_click(::aria::binding::IView& v,
        std::function<void()> cb) override;
 
    // ── Java/Kotlin event ingress ───────────────────────────────────────
    // Android listeners live on the managed side. They call these methods
    // from JNI to fan a native View event into the subscriptions installed
    // by on_*_changed / on_click. Pass the same JniView wrapper that was
    // bound through BindingEngine; notifications for unbound channels are
    // harmless no-ops.
    void notify_text_changed(::aria::binding::IView& v, std::string_view value);
    void notify_bool_changed(::aria::binding::IView& v, bool value);
    void notify_int_changed(::aria::binding::IView& v, int value);
    void notify_int64_changed(::aria::binding::IView& v, std::int64_t value);
    void notify_uint64_changed(::aria::binding::IView& v, std::uint64_t value);
    void notify_float_changed(::aria::binding::IView& v, float value);
    void notify_double_changed(::aria::binding::IView& v, double value);
    void notify_click(::aria::binding::IView& v);
 
private:
    struct Impl;
    std::shared_ptr<Impl> p_;
};
 
}  // namespace aria::adapters::jni