Module javafx.base

Package javafx.beans.binding

Class FloatBinding

java.lang.Object

javafx.beans.binding.NumberExpressionBase

javafx.beans.binding.FloatExpression

javafx.beans.binding.FloatBinding

All Implemented Interfaces:

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

public abstract class FloatBinding
extends FloatExpression
implements NumberBinding

Base class that provides most of the functionality needed to implement a Binding of a float value.

FloatBinding provides a simple invalidation-scheme. An extending class can register dependencies by calling bind(Observable...). If One of the registered dependencies becomes invalid, this FloatBinding is marked as invalid. With unbind(Observable...) listening to dependencies can be stopped.

To provide a concrete implementation of this class, the method computeValue() has to be implemented to calculate the value of this binding based on the current state of the dependencies. It is called when get() is called for an invalid binding.

See DoubleBinding for an example how this base class can be extended.

Since:

JavaFX 2.0

See Also:

Binding, NumberBinding, FloatExpression

Constructor Summary

Constructors

Constructor	Description
FloatBinding()	Creates a default FloatBinding.

Method Summary

Modifier and Type	Method	Description
protected void	bind(Observable... dependencies)	Start observing the dependencies for changes.
protected abstract float	computeValue()	Calculates the current value of this binding.
void	dispose()	A default implementation of dispose() that is empty.
float	get()	Returns the result of computeValue().
ObservableList<?>	getDependencies()	A default implementation of getDependencies() that returns an empty ObservableList.
protected void	onInvalidating()	The method onInvalidating() can be overridden by extending classes to react, if this binding becomes invalid.
String	toString()	Returns a string representation of this FloatBinding object.
protected void	unbind(Observable... dependencies)	Stop observing the dependencies for changes.

Methods declared in class javafx.beans.binding.FloatExpression

add, add, add, add, asObject, divide, divide, divide, divide, floatExpression, floatExpression, multiply, multiply, multiply, multiply, negate, 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, wait, wait, wait

Methods declared in interface javafx.beans.binding.Binding

invalidate, isValid

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 interface javafx.beans.Observable

addListener, removeListener

Methods declared in interface javafx.beans.value.ObservableNumberValue

doubleValue, floatValue, intValue, longValue

Methods declared in interface javafx.beans.value.ObservableValue

addListener, getValue, removeListener

Constructor Details

FloatBinding

public FloatBinding()

Creates a default FloatBinding.

Method Details

bind

protected final void bind(Observable... dependencies)

Start observing the dependencies for changes. If the value of one of the dependencies changes, the binding is marked as invalid.

Parameters:

dependencies - the dependencies to observe

unbind

protected final void unbind(Observable... dependencies)

Stop observing the dependencies for changes.

Parameters:

dependencies - the dependencies to stop observing

dispose

public void dispose()

A default implementation of dispose() that is empty.

Specified by:

dispose in interface Binding<Number>

getDependencies

public ObservableList<?> getDependencies()

A default implementation of getDependencies() that returns an empty ObservableList.

Specified by:

getDependencies in interface Binding<Number>

Returns:

an empty ObservableList

get

public final float get()

Returns the result of computeValue(). The method computeValue() is only called if the binding is invalid. The result is cached and returned if the binding did not become invalid since the last call of getValue.

Specified by:

get in interface ObservableFloatValue

Returns:

The current value

onInvalidating

protected void onInvalidating()

The method onInvalidating() can be overridden by extending classes to react, if this binding becomes invalid. The default implementation is empty.

computeValue

protected abstract float computeValue()

Calculates the current value of this binding.

Classes extending FloatBinding have to provide an implementation of computeValue.

Returns:

the current value

toString

public String toString()

Returns a string representation of this FloatBinding object.

Overrides:

toString in class Object

Returns:

a string representation of this FloatBinding object.