javafx.beans.property.FloatProperty Maven / Gradle / Ivy
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* accompanied this code).
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package javafx.beans.property;
import com.sun.javafx.binding.BidirectionalBinding;
import javafx.beans.binding.Bindings;
import javafx.beans.value.ObservableValue;
import javafx.beans.value.WritableFloatValue;
import com.sun.javafx.binding.Logging;
import java.security.AccessControlContext;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* This class defines a {@link Property} wrapping a {@code float} value.
*
* The value of a {@code FloatProperty} can be get and set with {@link #get()},
* {@link #getValue()}, {@link #set(float)}, and {@link #setValue(Number)}.
*
* A property can be bound and unbound unidirectional with
* {@link #bind(ObservableValue)} and {@link #unbind()}. Bidirectional bindings
* can be created and removed with {@link #bindBidirectional(Property)} and
* {@link #unbindBidirectional(Property)}.
*
* The context of a {@code FloatProperty} can be read with {@link #getBean()}
* and {@link #getName()}.
*
* Note: setting or binding this property to a null value will set the property to "0.0". See {@link #setValue(java.lang.Number) }.
*
* @see javafx.beans.value.ObservableFloatValue
* @see javafx.beans.value.WritableFloatValue
* @see ReadOnlyFloatProperty
* @see Property
*
* @since JavaFX 2.0
*/
public abstract class FloatProperty extends ReadOnlyFloatProperty implements
Property, WritableFloatValue {
/**
* {@inheritDoc}
*/
@Override
public void setValue(Number v) {
if (v == null) {
Logging.getLogger().fine("Attempt to set float property to null, using default value instead.", new NullPointerException());
set(0.0f);
} else {
set(v.floatValue());
}
}
/**
* {@inheritDoc}
*/
@Override
public void bindBidirectional(Property other) {
Bindings.bindBidirectional(this, other);
}
/**
* {@inheritDoc}
*/
@Override
public void unbindBidirectional(Property other) {
Bindings.unbindBidirectional(this, other);
}
/**
* Returns a string representation of this {@code FloatProperty} object.
* @return a string representation of this {@code FloatProperty} object.
*/
@Override
public String toString() {
final Object bean = getBean();
final String name = getName();
final StringBuilder result = new StringBuilder(
"FloatProperty [");
if (bean != null) {
result.append("bean: ").append(bean).append(", ");
}
if ((name != null) && (!name.equals(""))) {
result.append("name: ").append(name).append(", ");
}
result.append("value: ").append(get()).append("]");
return result.toString();
}
/**
* Returns a {@code FloatProperty} that wraps a
* {@link javafx.beans.property.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<Float> and
* a FloatProperty.
*
*
* FloatProperty floatProperty = new SimpleFloatProperty(1.0f);
* ObjectProperty<Float> objectProperty = new SimpleObjectProperty<>(2.0f);
*
* // Need to keep the reference as bidirectional binding uses weak references
* FloatProperty objectAsFloat = FloatProperty.floatProperty(objectProperty);
*
* floatProperty.bindBidirectional(objectAsFloat);
*
*
*
* Another approach is to convert the FloatProperty to ObjectProperty using
* {@link #asObject()} method.
*
*
* Note: null values in the source property will be interpreted as 0f
*
* @param property
* The source {@code Property}
* @return A {@code FloatProperty} that wraps the
* {@code Property}
* @throws NullPointerException
* if {@code property} is {@code null}
* @see #asObject()
* @since JavaFX 8.0
*/
public static FloatProperty floatProperty(final Property property) {
if (property == null) {
throw new NullPointerException("Property cannot be null");
}
return new FloatPropertyBase() {
private final AccessControlContext acc = AccessController.getContext();
{
BidirectionalBinding.bindNumber(this, property);
}
@Override
public Object getBean() {
return null; // Virtual property, no bean
}
@Override
public String getName() {
return property.getName();
}
@Override
protected void finalize() throws Throwable {
try {
AccessController.doPrivileged((PrivilegedAction) () -> {
BidirectionalBinding.unbindNumber(property, this);
return null;
}, acc);
} finally {
super.finalize();
}
}
};
}
/**
* Creates an {@link javafx.beans.property.ObjectProperty} that
* bidirectionally bound to this {@code FloatProperty}. If the value of
* this {@code FloatProperty} changes, the value of the
* {@code ObjectProperty} will be updated automatically and vice-versa.
*
*
* Can be used for binding an ObjectProperty to FloatProperty.
*
*
* FloatProperty floatProperty = new SimpleFloatProperty(1.0f);
* ObjectProperty<Float> objectProperty = new SimpleObjectProperty<>(2.0f);
*
* objectProperty.bind(floatProperty.asObject());
*
*
* @return the new {@code ObjectProperty}
* @since JavaFX 8.0
*/
@Override
public ObjectProperty asObject() {
return new ObjectPropertyBase () {
private final AccessControlContext acc = AccessController.getContext();
{
BidirectionalBinding.bindNumber(this, FloatProperty.this);
}
@Override
public Object getBean() {
return null; // Virtual property, does not exist on a bean
}
@Override
public String getName() {
return FloatProperty.this.getName();
}
@Override
protected void finalize() throws Throwable {
try {
AccessController.doPrivileged((PrivilegedAction) () -> {
BidirectionalBinding.unbindNumber(this, FloatProperty.this);
return null;
}, acc);
} finally {
super.finalize();
}
}
};
}
}