Gang,
I am working on a demo of Qi4j + Swing, and looking at how to do widget
bindings.
Let's say we have;
public interface Person
{
Property<String> firstName();
Property<String> lastName();
Property<Address> address();
}
public interface Address
{
Property<String> line1();
Property<String> line2();
:
}
// Swing "as usual"
public class PersonPanel extends JPanel
{
public PersonPanel( StateModel<Person> model )
{
TextField tf1 = new TextField();
add( tf1 );
model.bind( model.firstName() ).to( tf1 );
TextField tf3 = new TextField();
add( tf3 );
model.bind( model.address().get().line1() )
.to( tf3 );
}
}
Right now the StateModel is a normal class that needs to be created with the
ObjectBuilder, but we are planning to make it into a Composite instead.
Additionally, there are SwingAdapters which are responsible for the actual
binding, and the requirements of those are;
* implement SwingAdapter
* be ServiceComposites
* be visible from where the StateModel is used.
The SwingAdapter looks like this;
public interface SwingAdapter
{
Set<Pair> canHandle();
void fromSwingToProperty( JComponent component, Property<?> property );
void fromPropertyToSwing( JComponent component, Property<?> property );
public class Pair
{
public Class<? extends JComponent> component;
public Class<?> propertyType;
public Pair( Class<? extends JComponent> component,
Class<?> propertyType )
{
this.component = component;
this.propertyType = propertyType;
}
}
}
All SwingAdapters will be looked up in the "bind" phase, and asked for which
type and component combinations they can handle.
The "use"-phase is when a Person instance is set to the StateModel, such as;
StateModel<Person> model = .... ;
PersonPanel panel = new PersonPanel( model );
:
:
model.use( somePerson );
:
:
model.use( someOtherPerson );
Changes to the Property instance in "Person" will occur on focusLost events.
There are no buffering, as it is expected that all objects modified are
backed by a UnitOfWork.
We don't want to commit the code to trunk, since trunk is unstable at the
moment and the small sample can't be run. That is just a matter of... days?
Until then, I will fix up Associations and ManyAssociations.
Ok folks, WDYAT??
This will all end up in a library, and this is a perfect project for YOU to
get your hands dirty, since a lot of work is needed for the binding adapters.
Cheers
--
Niclas Hedhman, Software Developer
I live here; http://tinyurl.com/2qq9er
I work here; http://tinyurl.com/2ymelc
I relax here; http://tinyurl.com/2cgsug
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