Package io.jmix.ui.screen

Class Screen.BeforeShowEvent

java.lang.Object

java.util.EventObject

io.jmix.ui.screen.Screen.BeforeShowEvent

All Implemented Interfaces:

Serializable

Enclosing class:

Screen

@TriggerOnce
public static class Screen.BeforeShowEvent
extends EventObject

Event sent right before the screen is shown, i.e. it is not added to the application UI yet. Security restrictions are applied to UI components. Data is not loaded yet for screens having the DataLoadCoordinator facet.

In this event listener, you can load data, check permissions and modify UI components. For example:

     @Subscribe
     protected void onBeforeShow(BeforeShowEvent event) {
         customersDl.load();
     }
 

You can abort the process of opening the screen by throwing an exception. Note that if you have created notifications in this listener before the exception, they will still be shown even though the screen will not.

See Also:

• Screen.addBeforeShowListener(Consumer)
• Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
BeforeShowEvent(Screen source)

Method Summary

Modifier and Type	Method	Description
Screen	getSource()

Methods inherited from class java.util.EventObject

toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

BeforeShowEvent

public BeforeShowEvent(Screen source)

Method Details

getSource

public Screen getSource()

Overrides:

getSource in class EventObject