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com.vaadin.signals.impl.
Package com.vaadin.signals.impl
Interface UsageTracker.Usage
Enclosing class:
public static interface UsageTracker.Usage
Tracks the state of some used value.
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Method Summary
Modifier and TypeMethodDescriptionbooleanChecks whether the used value has subsequently been changed.
onNextChange(TransientListener listener) Registers a listener that will be invoked the next time there's a change to the used value.
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Method Details
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hasChanges
boolean hasChanges()Checks whether the used value has subsequently been changed.
Returns:
trueif the value has been changed,falseif there is no change -
onNextChange
Registers a listener that will be invoked the next time there's a change to the used value. If this usage already has changes, then the listener is invoked immediately.
Parameters:
listener- the listener to use, notnullReturns:
a callback for removing the listener, not
null
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