bridge.h

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#ifndef PLUGINBRIDGE_H
#define PLUGINBRIDGE_H
 
#include <QCoreApplication>
#include <QMutex>
#include <QObject>
 
#if QT_WIDGETS_LIB
#include <QWidget>
#else
class QWidget;
#endif
 
class PluginBridge final : public QObject
{
    Q_OBJECT
 
    friend class MainWindow;
 
public:
    inline explicit PluginBridge(QObject *parent = nullptr)
        : QObject(parent){};
 
    inline ~PluginBridge() final
    {
        if (mutex.tryLock())
            mutex.unlock();
    }
 
    inline QString ask(const QString &text)
    {
        mutex.lock();
        pause = true;
 
        Q_EMIT _ask(text, QPrivateSignal());
 
        while (pause)
            QCoreApplication::processEvents();
 
        mutex.unlock();
        return answer;
    };
 
    inline void sayAndWait(const QString &text)
    {
        if (text.isEmpty())
            return;
 
        mutex.lock();
        pause = true;
 
        Q_EMIT _sayAndWait(text, QPrivateSignal());
 
        while (pause)
            QCoreApplication::processEvents();
 
        mutex.unlock();
    }
 
public Q_SLOTS:
    inline void say(const QString &text) { Q_EMIT _say(text, QPrivateSignal()); };
 
Q_SIGNALS:
    void _say(const QString &text, QPrivateSignal);
 
    void _sayAndWait(const QString &text, QPrivateSignal);
 
    void _ask(const QString &text, QPrivateSignal);
 
    void useWidget(QWidget *widget);
 
private:
    QString answer;
    bool pause = false;
 
    QMutex mutex;
};
 
#endif