I am searching plugins skeleton

[AndrzejB]

I want write code editor based on QPlainTextEdit and highlighters from https://github.com/KDE/syntax-highlighting.
I prefer modular form with plugins. Plugin must be loaded/unloaded dynamically. In editor wil multitab with editor factory. Plugins for syntax highlight, theme, type correctness, encryption for encrypted documents...
How can I write framework and plugins?

[KazuoAsano]

@AndrzejB ,
I have never tried it, but I think that QPluginLoader Class can be used.
so please refer sample document as below.

• Qt Documentation: Echo Plugin Example
• Qt Documentation: QPluginLoader Class

[aha_1980]

@AndrzejB you can also have a look at QtCreators sorce code, as it does much of what you want.

Please note that plugins should not be unloaded, and I think it is rarely useful.

[ModelTech]

I have created dynamically loaded plugins for my application by following the Plug & Paint example. This example uses QPluginLoader for loading the plugins at run-time. One thing that turned out to be a bit more tricky than I anticipated based on the example is to identify the correct plugin path on the various platforms. So, here is a bit of my code that covers the Loading part:

    QDir PluginLocation = QDir(qApp->applicationDirPath());

    #if defined(Q_OS_WIN)
        if (PluginLocation.dirName().toLower() == "debug" || PluginLocation.dirName().toLower() == "release")
            PluginLocation.cdUp();
    #elif defined(Q_OS_MAC)
        QDir PackageLocation = QDir(qApp->applicationDirPath());
        PackageLocation.cdUp();
        PackageLocation.cdUp();
        PackageLocation.cdUp();
        PackageLocation.cdUp();
        if (PackageLocation.dirName().toLower() == "debug" || PackageLocation.dirName().toLower() == "release") {
            PluginLocation.cdUp();
            PluginLocation.cdUp();
            PluginLocation.cdUp();
            PluginLocation.cd("plugins");
        } else {
            PluginLocation.cdUp();
            PluginLocation.cd("PlugIns");
        }
    #endif

    #if not defined (Q_OS_MAC)
        PluginLocation.cd("plugins");
    #endif

    foreach (QString FileName, PluginLocation.entryList(QDir::Files)) {
        if (QLibrary::isLibrary(FileName)) {
            QPluginLoader Loader(PluginLocation.absoluteFilePath(FileName));
            QObject *Plugin = Loader.instance();
            if (Plugin) {
                // Do something useful with the plugin as in Plug & Paint example
            }
        }
    }

[AndrzejB]

Mac binary directory is so deep ? - (n times PackageLocation.cdUp())

[SGaist]

Hi,

No it's not, the binary is by default in MyApp.app/Content/MacOS while the plugins are in MyApp.app/Content/PlugIn. You may modify some of that however following the recommended layout (as Qt does for you) is way simpler.

[ModelTech]

@SGaist That is indeed correct when deploying the app but not when running from QtCreator. Hence, this not so nice construction... If anybody has a nicer solution, I am all ears :)

[SGaist]

To be sure we're on the same idea, you would like to have them at the correct place when you build your application ?