KParts::PartLoader Namespace Reference

Functions
template<class T >
static T *	createPartInstanceForMimeType (const QString &mimeType, QWidget *parentWidget=nullptr, QObject *parent=nullptr, QString *error=nullptr)
template<typename T >
static KPluginFactory::Result< T >	instantiatePart (const KPluginMetaData &data, QWidget *parentWidget=nullptr, QObject *parent=nullptr, const QVariantList &args={})
template<class T >
static KPluginFactory::Result< T >	instantiatePartForMimeType (const QString &mimeType, QWidget *parentWidget=nullptr, QObject *parent=nullptr, const QVariantList &args={})
KPARTS_EXPORT QList< KPluginMetaData >	partsForMimeType (const QString &mimeType)

Detailed Description

Helper methods for locating and loading parts.

This is based upon KPluginFactory, but it takes care of querying by mimetype, sorting the available parts by builtin preference and by user preference.

Since

5.69

Function Documentation

createPartInstanceForMimeType()

template<class T >

static T* KParts::PartLoader::createPartInstanceForMimeType ( const QString &  mimeType, QWidget *  parentWidget = nullptr, QObject *  parent = nullptr, QString *  error = nullptr  )

static

Use this method to create a KParts part.

It will try to create an object which inherits T.

Example:

QString errorString;
m_part = KParts::PartLoader::createPartInstanceForMimeType<KParts::ReadOnlyPart>(
              mimeType, this, this, &errorString);
if (m_part) {
    layout->addWidget(m_part->widget()); // Integrate the widget
    createGUI(m_part); // Integrate the actions
    m_part->openUrl(url);
} else {
    qWarning() << errorString;
}

Template Parameters

T	The interface for which an object should be created. The object will inherit T.

Parameters

mimeType	The mimetype for which we need a KParts.
parentWidget	The parent widget for the part's widget.
parent	The parent of the part.
error	Optional output parameter, it will be set to the error string, if any.

Returns

A pointer to the created object is returned, or nullptr if an error occurred.

Since

5.69

Definition at line 193 of file partloader.h.

instantiatePart()

template<typename T >

static KPluginFactory::Result<T> KParts::PartLoader::instantiatePart ( const KPluginMetaData &  data, QWidget *  parentWidget = nullptr, QObject *  parent = nullptr, const QVariantList &  args = {}  )

static

Attempts to create a KPart from the given metadata.

KPluginFactory::Result<MyPart> result = KParts::PartLoader::instantiatePart<MyPart>(metaData, parentWidget, parent, args);
if (result) {
    // result.plugin is valid and can be accessed
} else {
    // result contains information about the error
}

If there is no extra error handling needed the plugin can be directly accessed and checked if it is a nullptr

if (auto plugin = KParts::PartLoader::instantiatePart<MyPart>(metaData, parentWidget, parent, args).plugin) {
    // The plugin is valid and can be accessed
}

Parameters

data	KPluginMetaData from which the plugin should be loaded
parentWidget	The parent widget
parent	The parent object
args	A list of arguments to be passed to the part

Returns

Result object which contains the plugin instance and potentially error information

Since

5.100

Definition at line 90 of file partloader.h.

instantiatePartForMimeType()

template<class T >

static KPluginFactory::Result<T> KParts::PartLoader::instantiatePartForMimeType ( const QString &  mimeType, QWidget *  parentWidget = nullptr, QObject *  parent = nullptr, const QVariantList &  args = {}  )

static

Use this method to create a KParts part.

It will try to create an object which inherits T.

KPluginFactory::Result<KParts::ReadOnlyPart> result = KParts::PartLoader::instantiatePartForMimeType<KParts::ReadOnlyPart>(mimeType, parentWidget, parent,
args);
if (result) {
    // result.plugin is valid and can be accessed
} else {
    // result contains information about the error
}

If there is no extra error handling needed the plugin can be directly accessed and checked if it is a nullptr

if (auto plugin = KParts::PartLoader::instantiatePartForMimeType<KParts::ReadOnlyPart>(mimeType, parentWidget, parent, args).plugin) {
    // The plugin is valid and can be accessed
}

Template Parameters

T	The interface for which an object should be created. The object will inherit T.

Parameters

mimeType	The mimetype for which we need a KParts.
parentWidget	The parent widget for the part's widget.
parent	The parent of the part.

Returns

Result object which contains the plugin instance and potentially error information

Since

5.100

Definition at line 139 of file partloader.h.

partsForMimeType()

QList< KPluginMetaData > KParts::PartLoader::partsForMimeType

(

const QString &

mimeType

)

Locate all available KParts for a mimetype.

Returns

a list of plugin metadata, sorted by preference. This takes care both of the builtin preference (set by developers) and of user preference (stored in mimeapps.list).

This uses KPluginMetaData::findPlugins, i.e. it requires the parts to provide the metadata as JSON embedded into the plugin. Until KF6, however, it also supports .desktop files as a fallback solution.

To load a part from one of the KPluginMetaData instances returned here, use instantiatePart()

Since

5.69

Definition at line 71 of file partloader.cpp.