qt_view.hpp

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#pragma once
 
#include "aria/abi/export.hpp"
#include "aria/binding/view_adapter.hpp"
 
#include <QObject>
#include <QPointer>
#include <QWidget>
 
namespace aria::adapters::qt6 {

class ARIA_QT6_API QtView final : public binding::IView {
public:
    explicit QtView(QObject* w) noexcept : w_(w) {
        if (w) {
            // No context object: the connection is owned by the sender.
            // We disconnect explicitly in the destructor so a QtView that
            // dies before its widget cannot be called back.
            destroyed_conn_ = QObject::connect(
                w, &QObject::destroyed,
                [this]() noexcept { fire_destroy_(); });
        }
    }
 
    ~QtView() override {
        QObject::disconnect(destroyed_conn_);
        // ~IView fires the destroy signal as a last resort; it is
        // idempotent, so a widget-first teardown does not double-fire.
    }
 
    [[nodiscard]] std::string_view kind() const noexcept override { return "qt6"; }
 
    [[nodiscard]] QObject* object() const noexcept { return w_.data(); }
 
    template<typename T>
    [[nodiscard]] T* as() const noexcept { return qobject_cast<T*>(w_.data()); }
 
private:
    QPointer<QObject>       w_;
    QMetaObject::Connection destroyed_conn_;
};
 
}  // namespace aria::adapters::qt6