Examples with Binder com.vaadin.flow.data.binder.Binder used on opensource projects

Example 36 with Binder

use of com.vaadin.flow.data.binder.Binder in project flow-components by vaadin.

the class GridViewEditorPage method createBufferedDynamicEditor.

private void createBufferedDynamicEditor() {
    Div message = new Div();
    message.setId("buffered-dynamic-editor-msg");
    Grid<Person> grid = new Grid<>();
    List<Person> persons = new ArrayList<>();
    persons.addAll(createItems());
    grid.setItems(persons);
    Column<Person> nameColumn = grid.addColumn(Person::getFirstName).setHeader("Name");
    Column<Person> subscriberColumn = grid.addColumn(Person::isSubscriber).setHeader("Subscriber");
    Column<Person> emailColumn = grid.addColumn(Person::getEmail).setHeader("E-mail");
    Binder<Person> binder = new Binder<>(Person.class);
    Editor<Person> editor = grid.getEditor();
    editor.setBinder(binder);
    editor.setBuffered(true);
    TextField field = new TextField();
    binder.bind(field, "firstName");
    nameColumn.setEditorComponent(field);
    Div validationStatus = new Div();
    validationStatus.getStyle().set("color", "red");
    validationStatus.setId("email-validation");
    Checkbox checkbox = new Checkbox();
    binder.bind(checkbox, "subscriber");
    subscriberColumn.setEditorComponent(checkbox);
    TextField emailField = new TextField();
    // When not a subscriber, we want to show a read-only text-field that
    // ignores whatever is set to it
    TextField readOnlyEmail = new TextField();
    readOnlyEmail.setValue("Not a subscriber");
    readOnlyEmail.setReadOnly(true);
    Runnable bindEmail = () -> binder.forField(emailField).withValidator(new EmailValidator("Invalid email")).withStatusLabel(validationStatus).bind("email");
    Runnable setEmail = () -> emailColumn.setEditorComponent(item -> {
        if (item.isSubscriber()) {
            bindEmail.run();
            return emailField;
        } else {
            return readOnlyEmail;
        }
    });
    // Sets the binding based on the Person bean state
    setEmail.run();
    // Refresh subscriber editor component when checkbox value is changed
    checkbox.addValueChangeListener(event -> {
        // Only updates from the client-side should be taken into account
        if (event.isFromClient()) {
            // When using buffered mode, the partial updates shouldn't be
            // propagated to the bean before the Save button is clicked, so
            // here we need to override the binding function to take the
            // checkbox state into consideration instead
            emailColumn.setEditorComponent(item -> {
                if (checkbox.getValue()) {
                    bindEmail.run();
                    return emailField;
                } else {
                    return readOnlyEmail;
                }
            });
            grid.getEditor().refresh();
        }
    });
    Collection<Button> editButtons = Collections.newSetFromMap(new WeakHashMap<>());
    // Resets the binding function to use the bean state whenever the editor
    // is closed
    editor.addCloseListener(event -> {
        setEmail.run();
        editButtons.stream().forEach(button -> button.setEnabled(true));
    });
    Column<Person> editorColumn = grid.addComponentColumn(person -> {
        Button edit = new Button("Edit");
        edit.addClassName("edit");
        edit.addClickListener(e -> {
            editor.editItem(person);
            field.focus();
        });
        edit.setEnabled(!editor.isOpen());
        editButtons.add(edit);
        return edit;
    });
    editor.addOpenListener(e -> editButtons.stream().forEach(button -> button.setEnabled(!editor.isOpen())));
    editor.addCloseListener(e -> editButtons.stream().forEach(button -> button.setEnabled(!editor.isOpen())));
    Button save = new Button("Save", e -> editor.save());
    save.addClassName("save");
    Button cancel = new Button("Cancel", e -> editor.cancel());
    cancel.addClassName("cancel");
    // Add a keypress listener that listens for an escape key up event.
    // Note! some browsers return key as Escape and some as Esc
    grid.getElement().addEventListener("keyup", event -> editor.cancel()).setFilter("event.key === 'Escape' || event.key === 'Esc'");
    Div buttons = new Div(save, cancel);
    editorColumn.setEditorComponent(buttons);
    editor.addSaveListener(event -> message.setText(event.getItem().getFirstName() + ", " + event.getItem().isSubscriber() + ", " + event.getItem().getEmail()));
    grid.setId("buffered-dynamic-editor");
    addCard("Grid Editor", "Dynamic Editor in Buffered Mode", message, validationStatus, grid);
}