Base for the composer's cancelable events. Listeners flip Cancel = true to halt the default behavior; the matching After* event will not fire. CancelReason is free-form, for telemetry or for a host that wants to explain itself in the UI.
Cancel = true
After*
CancelReason
Optional
Base for the composer's cancelable events. Listeners flip
Cancel = trueto halt the default behavior; the matchingAfter*event will not fire.CancelReasonis free-form, for telemetry or for a host that wants to explain itself in the UI.