com.vaadin.flow.component

Class Shortcuts

java.lang.Object

com.vaadin.flow.component.Shortcuts

public final class Shortcuts
extends Object

Collections of methods for configuring more complex Shortcut interactions.

Unlike the shortcut methods offered by Focusable and ClickNotifier, these methods allow for configuring the lifecycleOwner directly, making it possible to added the shortcut onto any component. The lifecycleOwner denotes the component to which the shortcut is bound to. If the lifecycle owner is not attached, visible, or enabled, the shortcut won't work, and vice-versa.

Since:

1.3

Author:

Vaadin Ltd.

See Also:

for adding a shortcut for focusing the component, for adding a shortcut which performs the click-action

Method Summary

Modifier and Type	Method and Description
static ShortcutRegistration	addShortcutListener(Component lifecycleOwner, Command command, Key key, KeyModifier... keyModifiers) Invoke a Command when the shortcut is invoked.
static ShortcutRegistration	addShortcutListener(Component lifecycleOwner, ShortcutEventListener listener, Key key, KeyModifier... keyModifiers) Invoke a ShortcutEventListener when the shortcut is invoked.
static Registration	setShortcutListenOnElement(String elementLocatorJs, Component listenOnComponent) Setup an element, that is only accessible on the browser (not server side), to listen for shortcut events on and delegate to the given component.

Methods inherited from class java.lang.Object

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

Method Detail

addShortcutListener

public static ShortcutRegistration addShortcutListener(Component lifecycleOwner,
                                                       Command command,
                                                       Key key,
                                                       KeyModifier... keyModifiers)

Invoke a Command when the shortcut is invoked.

Registering a shortcut using this method will tie it to lifecycleOwner and the shortcut is available in the global scope.

By default, the shortcut's listener is bound to UI. The listening component can be changed by calling ShortcutRegistration.listenOn(Component...).

Parameters:

lifecycleOwner - the component that controls, when the shortcut is active. If the component is either invisible or detached, the shortcut won't work. Cannot be null

command - code to execute when the shortcut is invoked. Cannot be null

key - primary Key used to trigger the shortcut. Cannot be null

keyModifiers - KeyModifiers which also need to be pressed for the shortcut to trigger

Returns:

ShortcutRegistration for configuring and removing the shortcut

addShortcutListener

public static ShortcutRegistration addShortcutListener(Component lifecycleOwner,
                                                       ShortcutEventListener listener,
                                                       Key key,
                                                       KeyModifier... keyModifiers)

Invoke a ShortcutEventListener when the shortcut is invoked.

Registering a shortcut using this method will tie it to lifecycleOwner and the shortcut is available in the global scope.

By default, the shortcut's listener is bound to UI. The listening component can be changed by calling ShortcutRegistration.listenOn(Component...).

Parameters:

lifecycleOwner - the component that controls, when the shortcut is active. If the component is either invisible or detached, the shortcut won't work. Cannot be null

listener - listener to execute when the shortcut is invoked. Receives a ShortcutEvent. Cannot be null

key - primary Key used to trigger the shortcut. Cannot be null

keyModifiers - KeyModifiers which also need to be pressed for the shortcut to trigger

Returns:

ShortcutRegistration for configuring and removing the shortcut

setShortcutListenOnElement

public static Registration setShortcutListenOnElement(String elementLocatorJs,
                                                      Component listenOnComponent)

Setup an element, that is only accessible on the browser (not server side), to listen for shortcut events on and delegate to the given component. The element will be located in the browser by executing the given JS statement. This needs to be set for each listen-on component instance.

This should be only used by component developers, when their component is used as the listenOn component for shortcuts, and their component does some magic on the browser which means that the shortcut events are not coming through from the actual element. Thus when an application developer calls e.g.
myButton.addClickShortcut(Key.ENTER).listenOn(dialog);
the framework will automatically make sure the events are passed from the browser only element to the listenOn component (dialog in this case).

Parameters:

elementLocatorJs - js execution string that references the desired element in DOM or null to any remove existing locator

listenOnComponent - the component that is setup for listening shortcuts on ShortcutRegistration.listenOn(Component...)

Returns:

a registration for removing the locator, does not affect active shortcuts or if the locator has changed from what was set for this registration

Since: