Shared bean to create components across screens

Support
#1

Im wondering if its possible to have a bean that is not quite a service that has access to the front isnt a screen but can be shared by screens to create specific UiComponents or shared things in the screens.
I hope this makes sense… is this possible?

#2

Sure, why not:

import io.jmix.ui.UiComponents;
import io.jmix.ui.component.CheckBox;
import org.springframework.stereotype.Component;

@Component
public class MyUiComponentsFactory {

    private final UiComponents uiComponents;

    public MyUiComponentsFactory(UiComponents uiComponents) {
        this.uiComponents = uiComponents;
    }

    public CheckBox createCheckBox() {
        return uiComponents.create(CheckBox.class);
    }
}

public class MyScreen extends Screen {

    @Autowired
    private MyUiComponentsFactory myUiComponentsFactory;

    private void whatever() {
        CheckBox checkBox = myUiComponentsFactory.createCheckBox();
        // ...

UiComponents is a regular bean, so you can inject it into any other bean.

#3

Looks simple enough. Can this bean work for background tasks and threads? and can it be located on any package?

#4

Yes, but as a singleton it should not have any mutable state.

#5

last question. Why can I not just inject the UIComponents rather than having that setter?

#6

Of course you can, in the example above it’s just constructor injection.

The following will work too:

@Component
public class MyUiComponentsFactory {

    @Autowired
    private UiComponents uiComponents;
1 Like