Overview of event handling:

In order to describe how events are handled, two small items of vocabulary need to be introduced. An event source is an object that gives rise to an event. Typical event sources are buttons and menu lists. An event listener is an object that responds to an event. So the source of the event and the place where the event is dealt with are separate. This nicely separates the interface (the visual components) from the implementation (the code that carries out the processing). If, at a later date, either the graphical user interface or the processing code has to change then these changes can be localized.

When an event happens to a component of the visual interface, that component reports the event to the 'system'. If you are interested in that event (for example, a mouse click on a button), then you will register your interest by attaching an event listener for that particular action to that particular component. If you are not interested in that event (for example, a mouse simply moving over a button) then you do not attach an event listener and the event will not be acted upon when it occurs.

Each event listener is an object of a class that implements a specific type of listener interface (note that this is an interface in the Java programming sense). Inside the listener you put the code that triggers off the processing that you want to happen when an event occurs.

So in order to get a visual component that 'does something', you need to follow a three­ step plan.

1 Create and place the component on the graphical user interface.
2 Define the required event listener class.
3 Create an instance of the event listener and register it with the component.

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