KeyInputModifierNode

interface KeyInputModifierNode : DelegatableNode

Implement this interface to create a Modifier.Node that can intercept hardware Key events.

The event is routed to the focused item. Before reaching the focused item, onPreKeyEvent() is called for parents of the focused item. If the parents don't consume the event, onPreKeyEvent() is called for the focused item. If the event is still not consumed, onKeyEvent() is called on the focused item's parents.

Functions

fun onKeyEvent(event: KeyEvent): Boolean

This function is called when a KeyEvent is received by this node during the upward pass. While implementing this callback, return true to stop propagation of this event. If you return false, the key event will be sent to this KeyInputModifierNode's parent.

fun onPreKeyEvent(event: KeyEvent): Boolean

This function is called when a KeyEvent is received by this node during the downward pass. It gives ancestors of a focused component the chance to intercept an event. Return true to stop propagation of this event. If you return false, the event will be sent to this KeyInputModifierNode's child. If none of the children consume the event, it will be sent back up to the root using the onKeyEvent function.