extensionwatcher.h

Go to the documentation of this file.

// SPDX-FileCopyrightText: 2024 Manuel Schneider
// SPDX-License-Identifier: MIT
 
#pragma once
#include <QObject>
#include <albert/export.h>
#include <albert/extensionregistry.h>
 
namespace albert
{
 
template<class T>
class ALBERT_EXPORT ExtensionWatcher
{
public:
    explicit ExtensionWatcher(ExtensionRegistry *registry = nullptr)
    {
        if (registry)
            setExtensionRegistry(registry);
    }
 
    void setExtensionRegistry(ExtensionRegistry *registry)
    {
        QObject::disconnect(conn_add);
        conn_add = QObject::connect(registry, &ExtensionRegistry::added,
                                    [this](Extension *e){ if (T *t = dynamic_cast<T*>(e)) onAdd(t); });
 
        QObject::disconnect(conn_rem);
        conn_rem = QObject::connect(registry, &ExtensionRegistry::removed,
                                    [this](Extension *e){ if (T *t = dynamic_cast<T*>(e)) onRem(t); });
    }
 
protected:
 
    virtual void onAdd(T *) {}
 
    virtual void onRem(T *) {}
 
    virtual ~ExtensionWatcher()
    {
        QObject::disconnect(conn_add);
        QObject::disconnect(conn_rem);
    }
 
private:
    QMetaObject::Connection conn_add;
    QMetaObject::Connection conn_rem;
};
}