Module javafx.base

Package javafx.beans.property

Class DoubleProperty

java.lang.Object

javafx.beans.binding.NumberExpressionBase

javafx.beans.binding.DoubleExpression

javafx.beans.property.ReadOnlyDoubleProperty

javafx.beans.property.DoubleProperty

All Implemented Interfaces:

NumberExpression, Observable, Property<Number>, ReadOnlyProperty<Number>, ObservableDoubleValue, ObservableNumberValue, ObservableValue<Number>, WritableDoubleValue, WritableNumberValue, WritableValue<Number>

Direct Known Subclasses:

DoublePropertyBase, JavaBeanDoubleProperty

public abstract class DoubleProperty
extends ReadOnlyDoubleProperty
implements Property<Number>, WritableDoubleValue

This class defines a Property wrapping a double value.

The value of a DoubleProperty can be get and set with ObservableDoubleValue.get(), DoubleExpression.getValue(), WritableDoubleValue.set(double), 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 DoubleProperty 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:

• ObservableDoubleValue
• WritableDoubleValue
• ReadOnlyDoubleProperty
• Property

Constructor Summary

Constructors

Constructor	Description
DoubleProperty()	Creates a default DoubleProperty.

Method Summary

Modifier and Type	Method	Description
ObjectProperty<Double>	asObject()	Creates an ObjectProperty that bidirectionally bound to this DoubleProperty.
void	bindBidirectional(Property<Number> other)	Create a bidirectional binding between this Property and another one.
static DoubleProperty	doubleProperty(Property<Double> property)	Returns a DoubleProperty 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 DoubleProperty object.
void	unbindBidirectional(Property<Number> other)	Removes a bidirectional binding between this Property and another one.

Methods declared in class javafx.beans.property.ReadOnlyDoubleProperty

readOnlyDoubleProperty

Methods declared in class javafx.beans.binding.DoubleExpression

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

Methods declared in class javafx.beans.binding.NumberExpressionBase

asString, asString, asString, 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, numberExpression

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.ObservableDoubleValue

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.WritableDoubleValue

get, set

Methods declared in interface javafx.beans.value.WritableValue

getValue

Constructor Details

DoubleProperty

public DoubleProperty()

Creates a default DoubleProperty.

Method Details

setValue

public void setValue(Number v)

Set the wrapped value.

Specified by:

setValue in interface WritableDoubleValue

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 DoubleProperty object.

Overrides:

toString in class ReadOnlyDoubleProperty

Returns:

a string representation of this DoubleProperty object.

doubleProperty

public static DoubleProperty doubleProperty(Property<Double> property)

Returns a DoubleProperty 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<Double> and a DoubleProperty.

   DoubleProperty doubleProperty = new SimpleDoubleProperty(1.0);
   ObjectProperty<Double> objectProperty = new SimpleObjectProperty<>(2.0);

   // Need to keep the reference as bidirectional binding uses weak references
   DoubleProperty objectAsDouble = DoubleProperty.doubleProperty(objectProperty);

   doubleProperty.bindBidirectional(objectAsDouble);

 

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

Note: null values in the source property will be interpreted as 0.0

Parameters:

property - The source Property

Returns:

A DoubleProperty that wraps the Property

Throws:

NullPointerException - if property is null

Since:

JavaFX 8.0

See Also:

• asObject()

asObject

public ObjectProperty<Double> asObject()

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

Can be used for binding an ObjectProperty to DoubleProperty.

   DoubleProperty doubleProperty = new SimpleDoubleProperty(1.0);
   ObjectProperty<Double> objectProperty = new SimpleObjectProperty<>(2.0);

   objectProperty.bind(doubleProperty.asObject());
 

Overrides:

asObject in class ReadOnlyDoubleProperty

Returns:

the new ObjectProperty

Since:

JavaFX 8.0