Intercept a message sent to a message handler.
The target handler of the message.
The message to be sent to the handler.
true
if the message should continue to be processed
as normal, or false
if processing should cease immediately.
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An object which intercepts messages sent to a message handler.
Notes
A message hook is useful for intercepting or spying on messages sent to message handlers which were either not created by the consumer, or when subclassing the handler is not feasible.
If
messageHook
returnsfalse
, no other message hooks will be invoked and the message will not be delivered to the handler.If all installed message hooks return
true
, the message will be delivered to the handler for processing.See also: installMessageHook and removeMessageHook