Catch Global Events

Hi,
i have a idea for a program. I want to catch all actions from the users. If the user performed this action with the mouse, i wanna show him a notification with the shortcut of this actions. For example: The user open with the mouse a new tab in Safari the program recognize this and show him a message "Hey you can do this with: Apple + T".
I played around with the
Code:
addGlobalMonitorForEventsMatchingMask:NSLeftMouseDownMask
but i can't find a connection to the Event that has been performed. Is there anybody with a idea how i can do this with build in classes from Cocoa/Objective-c? Thank in advance for your help Greetings from Germany Tobi

Investigate Display.addFilter().
"John Daly" <[email protected]> wrote in message
news:c2800n$fdg$[email protected]..
> How can I catch Global events in SWT. I want to carry out certain
> functionality when the user pressed a certain button on the keyboard.
>

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[CODE]
<?xml version="1.0" encoding="utf-8"?>

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[CODE]
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Hi There,
I just wanted to clear something up in my mind about Forte Global Events.
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Event propagation is a favorite subject of mine.
So I'll join in this discussion.
My view is Forte Events is one of the coolest features of the
system. It is something you usually have to pay a lot
for elsewhere. But hidden in the details of Event propagation
and reception are deep issues where different vendors and
different implementation techiques can have enormously big
impacts on scalability. It turns something that seems rather
simple and benign (posting Events) into a big differentiating factor.
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I divide Publish/Subscribe into two subclasses: Anonymous and Registered.
Anonymous Publish/Subscribe is where the publisher never knows
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publishes blindly, as it were. Examples are Ethernet Multicast,
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maybe the whole world. It doesn't matter to the publisher.
Registered Publish/Subscribe is where the publisher does keep
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Yes, Forte implements in its event model a form of Registered
Publish/Subscribe. They hide the details of the registration
and deregistration process from the programmer using their
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constructs and their sophisticated runtime system.
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message to each one.
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subscriber's vantage point, not much. You see the same message
regardless. From the network's point of view (and the publisher's)
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media (such as ethernet).
With Registered Publish/Subscribe the network sees N copies
of the same message being sent, one to each registered listener.
For a large number of listeners this traffic can be
overwhelming and can choke your network.
From the publishers point of view, there is the enormous cost of creating and sending individual messages to each subscriber.
You could, if you were really clever about this, decide to
compute the message (serializing the object graphs and
all that) just once and then sending the message N times.
But I don't think Forte runtime is this clever. Nothing
prevents them from doing this in the future. In fact I
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every workstation with the entire multicast traffic. I'm not
trying to plug TIBCO here (they are a subsidiary of Reuters,
the company I work for). Just using them as an example of
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just once and send it N times you have to implement a policy such
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By definition you only generate one message. So it has to be
readable by clients of any byte order or machine architecture.
As Carl points out below, there are good reasons for using
a Registered Publish/Subscribe Model. This occcurs where you
want to perform something special for each client, such as to
send a different message or to not send (filter) the message at all.
These types of decision have to be made on a listener-by-listener
basis.
Fred Scholldorf
[email protected]
516 434 6230
Thanks to Dale V. Georg and David Bell for their quick reponses.
It appears that my assumptions were completely incorrect and that
when an object registers an event on another object in a remote
partition that Forte keeps track of this and when that event is posted,
Forte directs it to only those references.
With this in mind then, I presume that I am correct in assuming that,
1.
Global events are not as network traffic intensive, as I was lead to believe,
ie, you can actually use them, if the need arises.>
2.
it would mean that if you were to want to broadcast a global event
it would probably be more efficient to let Forte do the posting, and
not try yourself to build up a list of references to active client partitions
and post individually to them one at a time. The only time you would want
to really do this would be if you were to broadcast to a subset of
the active cilents, using a single event.
Thanks,
- Carl------------------------------------------------------------------------
Any views expressed in this message are those of the individual sender,
except where the sender specifically states them to be the views of
Reuters Ltd.

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