|KService::List||defaultOffers (const QString &serviceType, const QString &constraint=QString()) const|
|KService::Ptr||preferredService (const QString &serviceType) const|
|KService::List||query (const QString &servicetype, const QString &constraint=QString()) const|
|static void||applyConstraints (KService::List &lst, const QString &constraint)|
|static KServiceTypeTrader *||self ()|
Basically, KServiceTypeTrader provides a way for an application to query all KDE services (that is, applications, components, plugins) that match a specific set of requirements. This allows to find specific services at run-time without having to hard-code their names and/or paths.
If you want to find all plugins for your application, you would define a KMyApp/Plugin servicetype, and then you can query the trader for it:
You can add a constraint in the "trader query language". For instance:
Please note that when including property names containing arithmetic operators like - or +, then you have to put brackets around the property name, in order to correctly separate arithmetic operations from the name. So for example a constraint expression like
needs to be written as
otherwise it could also be interpreted as Subtract the numeric value of the property "KMyApp" and "InterfaceVersion" from the property "X" and make sure it is greater than 4. Instead of the other meaning, make sure that the numeric value of "X-KMyApp-InterfaceVersion" is greater than 4.
- Since 5.90. For querying plugins use
KPluginMetaData::findPlugins. For querying applications use
KApplicationTrader. For querying KParts use
KParts::PartLoader. For querying desktop files use
Constructor & Destructor Documentation
Member Function Documentation
|KService::List KServiceTypeTrader::defaultOffers||(||const QString &||serviceType,|
|const QString &||constraint =
Returns all offers associated with a given servicetype, IGNORING the user preference.
The sorting will be the one coming from the InitialPreference in the .desktop files, and services disabled by the user will still be listed here. This is used for "Revert to defaults" buttons in GUIs.
|KService::List KServiceTypeTrader::query||(||const QString &||servicetype,|
|const QString &||constraint =
The main function in the KServiceTypeTrader class.
It will return a list of services that match your specifications. The only required parameter is the service type. This is something like 'text/plain' or 'text/html'. The constraint parameter is used to limit the possible choices returned based on the constraints you give it.
constraint language is rather full. The most common keywords are AND, OR, NOT, IN, and EXIST, all used in an almost spoken-word form. An example is:
The keys used in the query (Type, ServiceType, Exec) are all fields found in the .desktop files.
servicetype A service type like 'KMyApp/Plugin' or 'KFilePlugin'. constraint A constraint to limit the choices returned, QString() to get all services of the given
- A list of services that satisfy the query
This is a static pointer to the KServiceTypeTrader singleton.
You will need to use this to access the KServiceTypeTrader functionality since the constructors are protected.
- Static KServiceTypeTrader instance
- Since 5.90, see class API docs
The documentation for this class was generated from the following files: