ViewAction

ViewAction is a list action designed to view and edit entity instances. It opens the edit screen in the same way as EditAction, but it makes all fields non-editable and disables actions implementing interface ReadOnlyAwareScreen. If you want to allow users to switch the screen to the editable mode, add a button and link it with the predefined enableEditing action:

<hbox id="editActions" spacing="true">
    <button id="commitAndCloseBtn" action="windowCommitAndClose"/>
    <button id="closeBtn" action="windowClose"/>
    <button action="enableEditing"/> (1)
</hbox>
1 This button is shown only when the screen is in read-only mode.

You can redefine the enableEditing action caption in the main message pack using the actions.EnableEditing key, or right in the screen by specifying the caption attribute to the corresponding button.

ViewAction is implemented by the io.jmix.ui.action.list.ViewAction class and should be defined in XML using type="view" action’s attribute. You can configure common action parameters using XML attributes of the action element. See Declarative Actions for details. Below we describe parameters specific to the ViewAction class.

Properties

The following parameters can be set both in XML and in Java:

  • openMode - the editor screen opening mode as a value of the OpenMode enum: NEW_TAB, DIALOG, etc. By default, ViewAction opens the editor in THIS_TAB mode.

  • screenId - string id of the editor screen to use. By default, ViewAction uses either a screen, annotated with @PrimaryEditorScreen, or having identifier in the format of <entity_name>.edit, for example, demo_Customer.edit.

  • screenClass - Java class of the editor screen controller to use. It has a higher priority than screenId.

For example, if you want to open a specific editor screen as a dialog, you can configure the action in XML:

<action id="view" type="view">
    <properties>
        <property name="openMode" value="DIALOG"/>
        <property name="screenClass" value="ui.ex1.screen.entity.customer.CustomerEdit"/>
    </properties>
</action>

Alternatively, you can inject the action into the screen controller and configure it using setters:

@Named("custTable.view")
private ViewAction<Customer> viewAction;

@Subscribe
public void onInit(InitEvent event) {
    viewAction.setOpenMode(OpenMode.DIALOG);
    viewAction.setScreenClass(CustomerEdit.class);
}

Handlers

Now let’s consider parameters that can be configured only in Java code. To generate correctly annotated method stubs for these parameters, use Studio.

screenOptionsSupplier

It is a handler that returns the ScreenOptions object to be passed to the opened editor screen. For example:

@Install(to = "custTable.view", subject = "screenOptionsSupplier")
private ScreenOptions custTableViewScreenOptionsSupplier() {
    return new MapScreenOptions(ParamsMap.of("someParameter", 10));
}

The returned ScreenOptions object will be available in the InitEvent of the opened screen.

screenConfigurer

It is a handler that accepts the editor screen and can initialize it before opening. For example:

@Install(to = "custTable.view", subject = "screenConfigurer")
private void custTableViewScreenConfigurer(Screen screen) {
    ((CustomerEdit) screen).setSomeParameter(10);
}

Note that screen configurer comes into play when the screen is already initialized but not yet shown, that is, after its InitEvent and AfterInitEvent and before BeforeShowEvent are sent.

transformation

It is a handler that is invoked after the entity is selected and validated in the editor screen. It accepts the selected entity. You can use this handler to transform the committed entity (if enableEditing action was executed) before setting it to the target data container. For example:

@Install(to = "custTable.view", subject = "transformation")
private Customer custTableViewTransformation(Customer customer) {
    return reloadCustomer(customer);
}

afterCommitHandler

It is a handler that is invoked after the edited entity instance is committed in the editor screen if the user switched the screen to editable mode using enableEditing action mentioned above. The handler method accepts the updated entity. For example:

@Install(to = "custTable.view", subject = "afterCommitHandler")
private void custTableViewAfterCommitHandler(Customer customer) {
    System.out.println("Updated " + customer);
}

afterCloseHandler

It is a handler that is invoked after the editor screen is closed. AfterCloseEvent is passed to the handler. For example:

@Install(to = "custTable.view", subject = "afterCloseHandler")
private void custTableViewAfterCloseHandler(AfterCloseEvent afterCloseEvent) {
    if (afterCloseEvent.closedWith(StandardOutcome.COMMIT)) {
        System.out.println("Enabled editing and then committed");
    }
}

Using ActionPerformedEvent

If you want to perform some checks or interact with the user before the action is executed, subscribe to the action’s ActionPerformedEvent, and invoke the execute() method of the action when needed. The action will be invoked with all parameters that you defined for it. In the example below, we show a confirmation dialog before executing the action:

@Autowired
private ScreenBuilders screenBuilders;

@Subscribe("custTable.view")
public void onCustTableView(Action.ActionPerformedEvent event) {
    CustomerEdit customerEdit = screenBuilders.editor(custTable)
            .withOpenMode(OpenMode.DIALOG)
            .withScreenClass(CustomerEdit.class)
            .withAfterCloseListener(afterScreenCloseEvent -> {
                if (afterScreenCloseEvent.closedWith(StandardOutcome.COMMIT)) {
                    Customer committedCustomer = (afterScreenCloseEvent.getSource()).getEditedEntity();
                    System.out.println("Updated " + committedCustomer);
                }
            })
            .build();
    customerEdit.setReadOnly(true);
    customerEdit.show();
}