Layout events

Events that occur when the layout engine changes the layout of an element.

Read time 1 minute

Last updated a month ago

GeometryChangedEvent

is currently the only layout event.

The base class for

GeometryChangedEvent

is the EventBase class.

The following table describes the layout event and its propagation phases:

Event	Description	Trickles down	Bubbles up	Cancellable
GeometryChangedEvent	Sent when the position or the dimensions of an element changes.

Unique properties

oldRect
: The former position and dimensions of the element.

newRect
: The new position and dimensions of the element.

The

GeometryChangedEvent

is sent when either the position or the dimensions of an element changes. Events of this type are only sent to the event target.

It's important to unregister from the

GeometryChangedEvent

event after you receive your callback, as additional layout changes will trigger the callback again.

target
: The element with a new geometry.