| Event Handler |
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| CATEGORIES ABOUT EVENT HANDLER | |
| software design patterns | |
| event computing | |
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The events are created by the framework based on interpreting lower-level inputs, which may be lower-level events themselves. For example, mouse movements and clicks are interpreted as menu selections. The events initially originate from actions on the operating system level, such as Interrupts generated by hardware devices, software interrupt instructions, or state changes in Polling . On this level, Interrupt Handler s and Signal Handler s correspond to event handlers. Created events are first processed by an ''event dispatcher'' within the framework. It typically manages the associations between events and event handlers, and may queue event handlers or events for later processing. Event dispatchers may call event handlers directly, or wait for events to be dequeued with information about the handler to be executed. DETAILS How any particular event handling system functions is highly dependent on the computer hardware, the operating system, the Programming Language , and the application program's environment. A programmer will need to consult the documentation provided in order to understand exactly how to use an event handling system. ''Users'' typically need only know how the interface to applications, windowing systems, and console terminals function. SEE ALSO
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