Module javafx.base

Package javafx.beans.binding

Class FloatExpression

java.lang.Object

javafx.beans.binding.NumberExpressionBase

javafx.beans.binding.FloatExpression

All Implemented Interfaces:

NumberExpression, Observable, ObservableFloatValue, ObservableNumberValue, ObservableValue<Number>

Direct Known Subclasses:

FloatBinding, ReadOnlyFloatProperty

public abstract class FloatExpression
extends NumberExpressionBase
implements ObservableFloatValue

FloatExpression is an ObservableFloatValue plus additional convenience methods to generate bindings in a fluent style.

A concrete sub-class of FloatExpression has to implement the method ObservableFloatValue.get(), which provides the actual value of this expression.

Since:

JavaFX 2.0

Constructor Summary

Constructors

Constructor	Description
FloatExpression()

Method Summary

Modifier and Type	Method	Description
ObjectExpression<Float>	asObject()	Creates an ObjectExpression that holds the value of this FloatExpression.
static FloatExpression	floatExpression(ObservableFloatValue value)	Returns a FloatExpression that wraps a ObservableFloatValue.
static <T extends Number> FloatExpression	floatExpression(ObservableValue<T> value)	Returns a FloatExpression that wraps an ObservableValue.

Methods declared in interface javafx.beans.binding.NumberExpression

add, add, add, add, add, asString, asString, asString, divide, divide, divide, divide, 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, multiply, multiply, multiply, multiply, negate, subtract, subtract, subtract, subtract, subtract

Methods declared in class javafx.beans.binding.NumberExpressionBase

numberExpression

Methods declared in class java.lang.Object

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

Methods declared in interface javafx.beans.Observable

addListener, removeListener

Methods declared in interface javafx.beans.value.ObservableFloatValue

get

Methods declared in interface javafx.beans.value.ObservableNumberValue

doubleValue, floatValue, intValue, longValue

Methods declared in interface javafx.beans.value.ObservableValue

addListener, getValue, removeListener

Constructor Detail

FloatExpression

public FloatExpression()

Method Detail

floatExpression

public static FloatExpression floatExpression(ObservableFloatValue value)

Returns a FloatExpression that wraps a ObservableFloatValue. If the ObservableFloatValue is already a FloatExpression, it will be returned. Otherwise a new FloatBinding is created that is bound to the ObservableFloatValue.

Parameters:

value - The source ObservableFloatValue

Returns:

A FloatExpression that wraps the ObservableFloatValue if necessary

Throws:

NullPointerException - if value is null

floatExpression

public static <T extends Number> FloatExpression floatExpression(ObservableValue<T> value)

Returns a FloatExpression that wraps an ObservableValue. If the ObservableValue is already a FloatExpression, it will be returned. Otherwise a new FloatBinding is created that is bound to the ObservableValue.

Note: this method can be used to convert an ObjectExpression or ObjectProperty of specific number type to FloatExpression, which is essentially an ObservableValue<Number>. See sample below.

   FloatProperty floatProperty = new SimpleFloatProperty(1.0f);
   ObjectProperty<Float> objectProperty = new SimpleObjectProperty<>(2.0f);
   BooleanBinding binding = floatProperty.greaterThan(FloatExpression.floatExpression(objectProperty));
 

Note: null values will be interpreted as 0f

Type Parameters:

T - The type of Number to be wrapped

Parameters:

value - The source ObservableValue

Returns:

A FloatExpression that wraps the ObservableValue if necessary

Throws:

NullPointerException - if value is null

Since:

JavaFX 8.0

asObject

public ObjectExpression<Float> asObject()

Creates an ObjectExpression that holds the value of this FloatExpression. If the value of this FloatExpression changes, the value of the ObjectExpression will be updated automatically.

Returns:

the new ObjectExpression

Since:

JavaFX 8.0