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In computer programming, event-driven programming is a programming paradigm in which the flow of the program is determined by external events. Typical event can be UI events from mice, keyboards, touchpads and touchscreens, or external sensor inputs, or be programmatically generated ( message passing) from other programs or threads, or network ...
The events generated using a touchscreen are commonly referred to as touch events or gestures. Device events. Device events include action by or to a device, such as a shake, tilt, rotation, or move. Delegate event model Delegate event model. clickme is the event source –a button in this example–, and it contains a list of listeners.
Example of a more complex EPC diagram (in German). An event-driven process chain ( EPC) is a type of flow chart for business process modeling. EPC can be used to configure enterprise resource planning execution, and for business process improvement. It can be used to control an autonomous workflow instance in work sharing.
The event itself is a pointer to a method in another object. If the pointer is not empty, when an event occurs, the event handler is called. Events are commonly used in classes that support GUI. This is not the only area of application for events, however. The following code is an example of using events:
Flow-based programming. In computer programming, flow-based programming ( FBP) is a programming paradigm that defines applications as networks of black box processes, which exchange data across predefined connections by message passing, where the connections are specified externally to the processes. These black box processes can be reconnected ...
A state diagram for a door that can only be opened and closed. A state diagram is used in computer science and related fields to describe the behavior of systems. State diagrams require that the system is composed of a finite number of states. Sometimes, this is indeed the case, while at other times this is a reasonable abstraction.
Event-driven programming – program control flow is determined by events, such as sensor inputs or user actions (mouse clicks, key presses) or messages from other programs or threads. Automata-based programming – a program, or part, is treated as a model of a finite state machine or any other formal automaton.
A sequence diagram shows, as parallel vertical lines ( lifelines ), different processes or objects that live simultaneously, and, as horizontal arrows, the messages exchanged between them in the order in which they occur. This allows for the graphical specification of simple runtime scenarios. A system sequence diagram should specify and show ...