MediaIndexerControl QML Type

Provides an interface to control the media indexer. More...

Import Statement: import QtInterfaceFramework.Media 1.0
Instantiates: QIfMediaIndexerControl
Inherits:

AbstractFeature

Properties

Methods

Detailed Description

The MediaIndexerControl controls the media indexer. It provides a way to temporarily pause the indexing and resume it, as well as to inquire about the current state and progress of the indexing operation.

The MediaIndexerControl expects a single backend to be available. It is recommended to use it with discoveryMode set to AbstractFeature.AutoDiscovery.

Property Documentation

discoveryMode : enumeration

Holds the mode that is used for the autoDiscovery

Available values are:

ConstantDescription
NoAutoDiscoveryNo auto discovery is done and the ServiceObject needs to be set manually.
AutoDiscoveryTries to find a production backend with a matching interface and falls back to a simulation backend if not found.
LoadOnlyProductionBackendsOnly tries to load a production backend with a matching interface.
LoadOnlySimulationBackendsOnly tries to load a simulation backend with a matching interface.

If necessary, auto discovery is started once the feature creation is completed.

Note: If you change this property after the feature is instantiated, make sure to call startAutoDiscovery() to search for a new service object.


discoveryResult : enumeration

The result of the last autoDiscovery

Available values are:

ConstantDescription
NoResultIndicates that no auto discovery was started because the feature has already assigned a valid ServiceObject.
ErrorWhileLoadingAn error has happened while searching for a backend with a matching interface.
ProductionBackendLoadedA production backend was loaded, as a result of auto discovery.
SimulationBackendLoadedA simulation backend was loaded, as a result of auto discovery.s

isInitialized : bool

Indicates whether the feature has been initialized with all the values from the backend.

The property is true once the backend sends the QIfFeatureInterface::initializationDone signal to indicate that all values have now been initialized with values from the backend.

See also isValid and QIfFeatureInterface::initializationDone.


isValid : bool

Indicates whether the feature is ready for use.

The property is true if the feature is ready to be used, otherwise false. Not being ready usually indicates that no suitable service object could be found, or that automatic discovery has not been triggered.

The backend still might not have sent all properties yet and is not fully initialized. Use isInitialized instead to know when the feature holds all correct values.

See also QIfServiceObject, discoveryMode, and isInitialized.


progress : real

Holds the progress of the indexing operation.

The value is between 0 and 1.


serviceObject : ServiceObject

Sets the service object for the feature.

As Features only expose the front API facing the developer, a service object implementing the actual function is required. This is usually retrieved through the auto discovery mechanism.

The setter for this property returns false if the QIfServiceObject is already set to this particular instance or the QIfServiceObject isn't accepted by the feature.

See also discoveryMode.


state : enumeration

Holds the current state of the indexer.

It can be one of the following values:

ConstantDescription
IdleThe indexer is currently idle and is waiting for new files to be indexed.
ActiveThe indexer is currently busy with indexing.
PausedThe indexer is paused, due to a call to pause().
ErrorAn error has occurred during the indexing operation.

Method Documentation

pause()

Pauses the currently ongoing indexing operation.

See also resume() and state.


resume()

Resumes from the Paused state and resumes the indexing operation.

See also pause() and state.


enumeration startAutoDiscovery()

Performs an automatic discovery attempt.

The feature tries to locate a single ServiceObject that implements the required interface.

If no ServiceObject is found, the feature remains invalid. If more than one ServiceObject is found, the first instance is used.

This function returns either the type of the backend that was loaded; or an error.

If the discoveryMode is set to QIfAbstractFeature::NoAutoDiscovery, this function does nothing and returns QIfAbstractFeature::NoResult.

Return values are:

ConstantDescription
NoResultIndicates that no auto discovery was started because the feature already has a valid ServiceObject assigned.
ErrorWhileLoadingIndicates an error has occurred while searching for a backend with a matching interface.
ProductionBackendLoadedA production backend was loaded, as a result of auto discovery.
SimulationBackendLoadedA simulation backend was loaded, as a result of auto discovery.

See also Dynamic Backend System and QIfServiceManager.


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