Reality is a perception. Perceptions are not always based on facts, and are strongly influenced by illusions. Inquisitiveness is hence indispensable

Saturday, May 15, 2010

Event handling in GXT-GWT

This is the way I like to handle events. Note the ease with which the MessageSenders and MessageListeners can be "weaved" using aop/annotations. Unfortunately, I am not going the aop way for the time being.

The big picture:

Architecture diagram of a GWT-GXT application

Using a message listener

Using a message sender

The SubmitButtonListener is a button listener. I tend to separate UI events from business/semantic events. The message sender is used to fire the event. There is another reason why this separation was required, GWT EventHandler code cannot register listeners, while a event is being processed. I re-wrote the custom code and wanted to use it only for semantic events.

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Well for a start, I dont' want to!. Yes I am reclusive, no I am not secretive; Candid? Yes; Aspergers? No :). My friends call me an enthusiast, my boss calls me purist, I call myself an explorer, to summarise; just an inquisitive child who didnt'learn to take things for granted. For the sake of living, I work as a S/W engineer. If you dont' know what it means, turn back right now.