javafx.beans.binding.package.html Maven / Gradle / Ivy
javafx.beans.binding
Provides classes that create and operate on a {@link Binding Binding}
that calculates a value that depends on one or more sources.
Characteristics of Bindings
Bindings are assembled from one or more sources, usually called
their dependencies. A binding observes its dependencies for changes
and updates its own value according to changes in the dependencies.
Almost all bindings defined in this library require
implementations of {@link javafx.beans.Observable} for their
dependencies. There are two types of implementations already provided,
the properties in the package {@link javafx.beans.property} and the
observable collections ({@link javafx.collections.ObservableList} and
{@link javafx.collections.ObservableMap}). Bindings also implement
{@code Observable} and can again serve as sources for other bindings
allowing to construct very complex bindings from simple ones.
Bindings in our implementation are always calculated lazily.
That means, if a dependency changes, the result of a binding is not
immediately recalculated, but it is marked as invalid. Next time the
value of an invalid binding is requested, it is recalculated.
High Level API and Low Level API
The Binding API is roughly divided in two parts, the High Level
Binding API and the Low Level Binding API. The High Level Binding API
allows to construct simple bindings in an easy to use fashion.
Defining a binding with the High Level API should be straightforward,
especially when used in an IDE that provides code completion.
Unfortunately it has its limitation and at that point the Low Level
API comes into play. Experienced Java developers can use the Low Level
API to define bindings, if the functionality of the High Level API is
not sufficient or to improve the performance. The main goals of the
Low Level API are fast execution and small memory footprint.
Following is an example of how both APIs can be used. Assuming
we have four instances of {@link
javafx.beans.property.DoubleProperty} {@code a}, {@code b}, {@code
c} , and {@code d}, we can define a binding that calculates {@code a*b
+ c*d} with the High Level API for example like this:
{@code NumberBinding result = Bindings.add (a.multiply(b),
c.multiply(d)); }
Defining the same binding using the Low Level API could be done
like this:
DoubleBinding foo = new DoubleBinding() {
{
super.bind(a, b, c, d);
}
@Override
protected double computeValue() {
return a.getValue() * b.getValue() + c.getValue() * d.getValue();
}
};