Module qtjambi

Package io.qt.core

Class QObject.QComputedProperty<T>

java.lang.Object

io.qt.internal.QtJambiObject

io.qt.QtObject

io.qt.core.QUntypedPropertyData

io.qt.core.QObject.QComputedProperty<T>

All Implemented Interfaces:

QtObjectInterface

Enclosing class:

QObject

public final class QObject.QComputedProperty<T>
extends QUntypedPropertyData

The QComputedProperty class is a template class for externally computed/stored values. Create an instance of QComputedProperty by providing a value supplier.

Example:

private final QComputedProperty<QColor> color = new QComputedProperty<>(this::computeOptimalColor);

The Java type QComputedProperty corresponds to the C++ type QObjectComputedProperty.

For primitive-typed implementations see:

• QObject.QComputedBooleanProperty
• QObject.QComputedByteProperty
• QObject.QComputedShortProperty
• QObject.QComputedIntProperty
• QObject.QComputedLongProperty
• QObject.QComputedFloatProperty
• QObject.QComputedDoubleProperty
• QObject.QComputedCharProperty

Nested Class Summary

Nested classes/interfaces inherited from class io.qt.QtObject

QtObject.QPrivateConstructor

Constructor Summary

Constructors

Constructor	Description
QComputedProperty(QtUtilities.Supplier<T> getter)	Constructs a computed-value property whose type corresponds to the given value supplier.

Method Summary

Modifier and Type	Method	Description
boolean	hasBinding()
QPropertyChangeHandler	onValueChanged(Runnable f)	Registers the given functor f as a callback that shall be called whenever the value of the property changes.
QPropertyChangeHandler	subscribe(Runnable f)	Subscribes the given functor f as a callback that is called immediately and whenever the value of the property changes in the future.
T	value()	Returns the value of the property computed by the given getter.
QMetaType	valueMetaType()

Methods inherited from class io.qt.QtObject

dispose, equals, isDisposed

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

QComputedProperty

public QComputedProperty(QtUtilities.Supplier<T> getter)

Constructs a computed-value property whose type corresponds to the given value supplier.

Parameters:

getter - supplying the computed value

Method Details

value

@QtUninvokable public T value()

Returns the value of the property computed by the given getter.

Returns:

value

valueMetaType

@QtUninvokable public final QMetaType valueMetaType()

hasBinding

@QtUninvokable public final boolean hasBinding()

onValueChanged

@QtUninvokable public final QPropertyChangeHandler onValueChanged(Runnable f)

Registers the given functor f as a callback that shall be called whenever the value of the property changes.

The returned property change handler object keeps track of the registration. As long as the change handler is alive i.e. as long as a reference to the QPropertyChangeHandler instance exists, the callback remains installed. When the garbage collection deletes the instance, the callback is de-registered.

Parameters:

f -

Returns:

property change handler

See Also:

QPropertyChangeHandler

subscribe

@QtUninvokable public final QPropertyChangeHandler subscribe(Runnable f)

Subscribes the given functor f as a callback that is called immediately and whenever the value of the property changes in the future.

Parameters:

f -

Returns:

property change handler

See Also:

QPropertyChangeHandler, onValueChanged(Runnable)