Bidirectional binding enhancement

[Andrea Vacondio]

In my latest project I felt the need for a built in debounce
<https://reactivex.io/documentation/operators/debounce.html> which is
fairly common for search fields or similar.
Andrea

Il giorno mer 10 nov 2021 alle ore 08:51 Tom Schindl <
tom.schindl at bestsolution.at> ha scritto:

> Hi,
>
> We had something very similar in Eclipse-Databinding so I think
> something like that makes a lot of sense but I wonder how you want to
> implement this FOCUS, ACTION.
>
> Another thing we had was a delayed-Observable where the sync only
> happened if there hasn't been a change with a user specified timeout
> which fairly nice to implement undo/redo like stuff eg in TextAreas.
>
> As you don't have access to Node in javafx.base I'm not sure how you
> want to implement the trigger stuff. Just in case in Eclipse-Databinding
> world we had stuff like this in a module (in this case OSGi-Bundle) who
> has access to both the core-API and the ui-API.
>
> Tom
>
> Am 10.11.21 um 06:45 schrieb Michael Strauß:
> > JavaFX developers routinely use programming patterns like MVC, MVP, or
> > MVVM to separate views from their associated business logic. Bindings
> > can be used to connect the values of UI controls (like Label or
> > TextField) to properties on a business logic class.
> >
> > A typical (simplified) scenario may look like this:
> >
> > var valueField = new TextField();
> >
> valueField.textProperty().bindBidirectional(businessLogic.valueProperty());
> >
> > The business logic class may perform data validation or other actions
> > on the value that was entered in the TextField. However, in many
> > cases, it is neither necessary nor desirable for the binding to update
> > the business-layer property on every single change (i.e. every single
> > character that was typed by a user). For example, if a business rule
> > verifies that the data entered by a user is formatted in a specific
> > way, it's usually not a great experience to yield a validation error
> > before the user has finished typing. Instead, it's often better to
> > wait until the user has significantly interacted with a UI control
> > before running business logic.
> >
> > For this reason, I propose to add a new type of binding to the
> > javafx.beans.binding.Bindings class:
> >
> > void bindBidirectional(Property<T> target, Property<T> source,
> > UpdateSourceTrigger trigger)
> >
> > UpdateSourceTrigger is an enumeration that allows developers to
> > specify the condition on which changes of the target property will
> > update the source property. Its values are:
> >
> > DEFAULT: Updates the source property on every change (this is the
> > default behavior of bidirectional bindings).
> > FOCUS: Updates the source property when the UI control loses input focus.
> > ACTION: Updates the source property when the UI control loses input
> > focus or when it receives an ActionEvent (in the case of TextField,
> > this corresponds to the ENTER key).
> >
> > Note that this setting only applies to changes of the target property.
> > When the source property is changed instead, the target property is
> > always immediately updated.
> >
> > Any feedback on this proposal is appreciated.
> >
>
> --
> Tom Schindl - CTO
> BestSolution.at EDV Systemhaus GmbH
> Salurner Straße 15, A-6020 Innsbruck
> Phone: ++43 (0)512 935834
> http://www.BestSolution.at - http://efxclipse.org
>