creating QWidget Plugins

[Spooky]

I want to create QWidget plugins for an application, that implement a certain interface. Those plugins are simply custom views that implement that interface and the main application loads these widgets into the main view.

However, I am not sure how to do this efficiently. I know that the Plugin itself has to be of the form

class MyPlugin : public QObject, public MyPluginInterface
{
    Q_OBJECT
    Q_INTERFACES( MyPluginInterface )
    ...
};

class MyPlugin : public QObject, public MyPluginInterface
{
    Q_OBJECT
    Q_INTERFACES( MyPluginInterface )
    ...
};

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I read that, if I want to actually create a QWidget from this plugin, the interface should simply contain

class MyPluginInterface
{
    ...
    QWidget* createWidget(QWidget* parent) = 0;
    ...
};

class MyPluginInterface
{
    ...
    QWidget* createWidget(QWidget* parent) = 0;
    ...
};

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And thus there would be another class

class MyWidget : public QWidget
{
    ...
};

class MyWidget : public QWidget
{
    ...
};

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But how would I let the actual Widget itself interact with the application? Wouldn't I need to make a wrapper function in the plugin for every single function of the interface, so that it is passed to the Widget object?