SMW::Listener::ChangeListener::RegisterPropertyChangeListeners

• Since: 3.2
• Description: Hook to allow adding custom listeners to watch property changes as they appear during a data update.
• Reference class: PropertyChangeListener.php

Signature

use Hooks;
use SMW\Listener\ChangeListener\ChangeListeners\PropertyChangeListener;

Hooks::register( 'SMW::Listener::ChangeListener::RegisterPropertyChangeListeners', function( PropertyChangeListener $propertyChangeListener ) {

    return true;
} );

Example

use Hooks;
use SMW\Listener\ChangeListener\ChangeRecord;
use SMW\Listener\ChangeListener\ChangeListeners\PropertyChangeListener;

class ActOnPropertyChange {

    public function registerPropertyChangeListener( PropertyChangeListener $propertyChangeListener ) {

        $propertyChangeListener->addListenerCallback(
            new DIProperty( 'PropertyFoo' ),
            [ $this, 'onChange' ]
        );

        $propertyChangeListener->addListenerCallback(
            new DIProperty( 'PropertyBar' ),
            [ $this, 'onChange' ]
        );
    }

    public function onChange( DIProperty $property, ChangeRecord $changeRecord ) {

        if ( $property->getKey() === 'PropertyFoo' ) {
            foreach ( $changeRecord as $record ) {
                ...
            }
        }

        if ( $property->getKey() === 'PropertyBar' ) {
            foreach ( $changeRecord as $record ) {
                ...
            }
        }
    }
}

Hooks::register( 'SMW::Listener::ChangeListener::RegisterPropertyChangeListeners', function( PropertyChangeListener $propertyChangeListener ) {
    $actOnPropertyChange = new ActOnPropertyChange();
    $actOnPropertyChange->registerPropertyChangeListener( $propertyChangeListener );
} );