Event Listener
You can add an Event Listener node () to define event handlers as Event Handler subnodes (see Event Handler) that can listen to a parameter event, an attribute event, or a list event and run the handlers to set or reset a parameter value or run a coded method. The handler can be triggered with a condition.
To add an Event Listener node, right-click a Component, Property, or any of the physics feature nodes and select it from the context menu.
Definition
From the Specify object to listen to list, choose By reference (the default) or By name.
From the From list, define from where to take the event listener’s event:
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Choose User input from this property (the default) to choose any available user input defined in this Property (for event listeners under a Property node only) from the User input list, if you have chosen By reference, or type it into the User input field, if you have chosen By name.
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Choose User input from another property to choose a user input from another Property node, which you choose from the Property list, if you have chosen By reference, or type it into the Property field, if you have chosen By name. Then choose the user input from the User input list, if you have chosen By reference, or type it into the User input field, if you have chosen By name.
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Choose Entity attribute to listen to an attribute of the entity: Select Touched (the default), Label, or Tag from the Attribute list, if you have chosen By reference, or type an attribute into the Attribute field, if you have chosen By name.
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Choose List of children to listen to operations on the list of children under the current context. If the context is a Property, the children represents the physics features under the physics interface. If the context is a physics feature, the children represents the subfeatures under that physics feature. Select All list events (the default), Add child (after initialization), Remove child, or Move child from the List event list. Note that both the By reference and the By name options show this list.
If you have chosen By name from the Specify object to listen list, select the Do not listen to undefined references checkbox, if desired.