Module javafx.base

Package javafx.beans.property

Class LongProperty

java.lang.Object

javafx.beans.binding.NumberExpressionBase

javafx.beans.binding.LongExpression

javafx.beans.property.ReadOnlyLongProperty

javafx.beans.property.LongProperty

All Implemented Interfaces:

NumberExpression, Observable, Property<Number>, ReadOnlyProperty<Number>, ObservableLongValue, ObservableNumberValue, ObservableValue<Number>, WritableLongValue, WritableNumberValue, WritableValue<Number>

Direct Known Subclasses:

JavaBeanLongProperty, LongPropertyBase

public abstract class LongProperty
extends ReadOnlyLongProperty
implements Property<Number>, WritableLongValue

This class defines a Property wrapping a long value.

The value of a LongProperty can be get and set with ObservableLongValue.get(), LongExpression.getValue(), WritableLongValue.set(long), and setValue(Number).

A property can be bound and unbound unidirectional with Property.bind(ObservableValue) and Property.unbind(). Bidirectional bindings can be created and removed with bindBidirectional(Property) and unbindBidirectional(Property).

The context of a LongProperty can be read with ReadOnlyProperty.getBean() and ReadOnlyProperty.getName().

Note: setting or binding this property to a null value will set the property to "0.0". See setValue(java.lang.Number).

Since:

JavaFX 2.0

See Also:

• ObservableLongValue
• WritableLongValue
• ReadOnlyLongProperty
• Property

Constructor Summary

Constructors

Constructor	Description
LongProperty()	Creates a default LongProperty.

Method Summary

Modifier and Type	Method	Description
ObjectProperty<Long>	asObject()	Creates an ObjectProperty that bidirectionally bound to this LongProperty.
void	bindBidirectional(Property<Number> other)	Create a bidirectional binding between this Property and another one.
static LongProperty	longProperty(Property<Long> property)	Returns a LongProperty that wraps a Property and is bidirectionally bound to it.
void	setValue(Number v)	Set the wrapped value.
String	toString()	Returns a string representation of this LongProperty object.
void	unbindBidirectional(Property<Number> other)	Removes a bidirectional binding between this Property and another one.

Methods declared in class javafx.beans.property.ReadOnlyLongProperty

readOnlyLongProperty

Methods declared in class javafx.beans.binding.LongExpression

add, add, add, add, divide, divide, divide, divide, doubleValue, floatValue, getValue, intValue, longExpression, longExpression, longValue, multiply, multiply, multiply, multiply, negate, subtract, subtract, subtract, subtract

Methods declared in class javafx.beans.binding.NumberExpressionBase

add, asString, asString, asString, divide, greaterThan, greaterThan, greaterThan, greaterThan, greaterThan, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, greaterThanOrEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, isNotEqualTo, lessThan, lessThan, lessThan, lessThan, lessThan, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, lessThanOrEqualTo, multiply, numberExpression, subtract

Methods declared in class java.lang.Object

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

Methods declared in interface javafx.beans.Observable

addListener, removeListener, subscribe

Methods declared in interface javafx.beans.value.ObservableLongValue

get

Methods declared in interface javafx.beans.value.ObservableValue

addListener, flatMap, getValue, map, orElse, removeListener, subscribe, subscribe, when

Methods declared in interface javafx.beans.property.Property

bind, isBound, unbind

Methods declared in interface javafx.beans.property.ReadOnlyProperty

getBean, getName

Methods declared in interface javafx.beans.value.WritableLongValue

get, set

Methods declared in interface javafx.beans.value.WritableValue

getValue

Constructor Details

LongProperty

public LongProperty()

Creates a default LongProperty.

Method Details

setValue

public void setValue(Number v)

Set the wrapped value.

Specified by:

setValue in interface WritableLongValue

Specified by:

setValue in interface WritableValue<Number>

Parameters:

v - The new value

bindBidirectional

public void bindBidirectional(Property<Number> other)

Create a bidirectional binding between this Property and another one. Bidirectional bindings exists independently of unidirectional bindings. So it is possible to add unidirectional binding to a property with bidirectional binding and vice-versa. However, this practice is discouraged.

It is possible to have multiple bidirectional bindings of one Property.

JavaFX bidirectional binding implementation use weak listeners. This means bidirectional binding does not prevent properties from being garbage collected.

Specified by:

bindBidirectional in interface Property<Number>

Parameters:

other - the other Property

unbindBidirectional

public void unbindBidirectional(Property<Number> other)

Removes a bidirectional binding between this Property and another one. If no bidirectional binding between the properties exists, calling this method has no effect. It is possible to unbind by a call on the second property. This code will work:

     property1.bindBidirectional(property2);
     property2.unbindBidirectional(property1);
 

Specified by:

unbindBidirectional in interface Property<Number>

Parameters:

other - the other Property

toString

public String toString()

Returns a string representation of this LongProperty object.

Overrides:

toString in class ReadOnlyLongProperty

Returns:

a string representation of this LongProperty object.

longProperty

public static LongProperty longProperty(Property<Long> property)

Returns a LongProperty that wraps a Property and is bidirectionally bound to it. Changing this property will result in a change of the original property.

This is very useful when bidirectionally binding an ObjectProperty<Long> and a LongProperty.

   LongProperty longProperty = new SimpleLongProperty(1L);
   ObjectProperty<Long> objectProperty = new SimpleObjectProperty<>(2L);

   // Need to keep the reference as bidirectional binding uses weak references
   LongProperty objectAsLong = LongProperty.longProperty(objectProperty);

   longProperty.bindBidirectional(objectAsLong);

 

Another approach is to convert the LongProperty to ObjectProperty using asObject() method.

Note: null values in the source property will be interpreted as 0L

Parameters:

property - The source Property

Returns:

A LongProperty that wraps the Property

Throws:

NullPointerException - if property is null

Since:

JavaFX 8.0

See Also:

• asObject()

asObject

public ObjectProperty<Long> asObject()

Creates an ObjectProperty that bidirectionally bound to this LongProperty. If the value of this LongProperty changes, the value of the ObjectProperty will be updated automatically and vice-versa.

Can be used for binding an ObjectProperty to LongProperty.

   LongProperty longProperty = new SimpleLongProperty(1L);
   ObjectProperty<Long> objectProperty = new SimpleObjectProperty<>(2L);

   objectProperty.bind(longProperty.asObject());
 

Overrides:

asObject in class ReadOnlyLongProperty

Returns:

the new ObjectProperty

Since:

JavaFX 8.0