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Parameters
| Parameter |
Description |
| callback |
The event handler to add. If the handler is null, this method throws an exception. |
| useTrickleDown |
By default, this callback is called during the BubbleUp phase. Pass TrickleDown.TrickleDown to call this callback during the TrickleDown phase. |
Description
Adds an event handler to the instance.
The event handler is automatically unregistered after it has been invoked exactly once.
Parameters
| Parameter |
Description |
| callback |
The event handler to add. If the handler is null, this method throws an exception. |
| userArgs |
Data to pass to the callback. Use this argument to avoid closing on local variables. |
| useTrickleDown |
By default, this callback is called during the BubbleUp phase. Pass TrickleDown.TrickleDown to call this callback during the TrickleDown phase. |
Description
Adds an event handler to the instance.
The event handler is automatically unregistered after it has been invoked exactly once.