CODEWITHSUNDEEP
javajavafxbindingspinner
abdou amer
abdou amer

Reputation: 849

javaFX Storing number format in label or spinner

I have a tableview, in one of his columns i calculate the subTotal: Column "subTotal" = "Qty * price", after calculating the subtotals, i calculate the sum of all subtotals. Maybe using: - a label,So How i can store and retrieve the sum from a label as needed. - Spinner, So How to bind the sum to the Spinner's valueProperty.

Here is the first option using a label:

 DoubleBinding doubleBinding = Bindings.createDoubleBinding(() -> tableView.getItems().stream().
                collect(Collectors.summingDouble(LineCommand::getSubTotal)), tableView.getItems());
        lblTotalHt.textProperty().bind(Bindings.format("%3.2f", doubleBinding));

The problem how i can retreive the stored sum ?

the second option: How to perform this using a spinner

fldTotalHt.valueProperty().....Bind(toTheSum);

Upvotes: 0

Views: 731

Answers (2)

James_D
James_D

Reputation: 209225

For your first question: "How can I retrieve the stored sum?", you can get this from the binding with

double sum = doubleBinding.getValue();

For the second question, you can do

Spinner<Double> spinner = new Spinner(min, max, doubleBinding.getValue());
spinner.getValueFactory().valueProperty().bind(doubleBinding.asObject());

(asObject() effectively converts the ObservableValue<Number> to an ObservableValue<Double>).

But note that binding a spinner's value is pretty pointless. A bound value cannot be set, for obvious reasons, so the user would not be allowed to change the value of the spinner - this means it would have no more functionality than a label. It's really not clear why you would want to display this value in a spinner, since it really doesn't make any sense for the user to be able to change a value which is computed from other values. Why not just use a label?

Upvotes: 1

Meegoo
Meegoo

Reputation: 417

If fldTotalHt is a Spinner, then you can access its value property like this

fldTotalHt.getValueFactory().valueProperty().bind(sumProperty)

About a label. I don't quite understand, what you really what. As I understood, you just can't get label's contents. But that's simply label.getText() and it's strange if you know about properties and bindings, but don't know about that.

Upvotes: 1

Related Questions