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  1. Chapter 15. An event is an object created from an event source. You can write code to process events such as a button click, mouse movement, and keystrokes. Procedural programming vs. event-driven programming. Code is executed in procedural order. Event-driven programming. Code is executed upon activation of events. Event source object.

  2. Events. http://docs.oracle.com/javase/8/javafx/events-tutorial/events.htm#JFXED117. GUI code responds to (and creates) events. mouse button, keyboard pressed, mouse motion, window exposed,... All subclasses of javafx.ui.Event. Some nodes already handle events on their own, generate new events, e.g.: Buttons: mouse press, release → ‘button clicked’.

  3. event-driven programming: programming paradigm in which the flow of the program is determined by events (e.g. mouse clicks, key presses) event handler: function that is called when a. 5. particular event occurs.

  4. What do we do with Events? •We ultimately want to execute some (arbitrary) code when a particular event happens •A mouse move should be a unique event compared to a button click or a key press •Different classes of events may have different options •We need an abstraction to this code that should run when different events occur

  5. Event-Driven Programming in Java: • The JVM receives event messages from the OS, and then sends messages to (invokes implemented interface methods of) objects registered for each event.

  6. How can we write programs that respond to user actions? Why do we use classes when writing code for other people to use? Today’s topics. Review. Event-driven programming. Classes and abstraction. What’s next? Review. Encapsulation. Integration. All the smaller parts add up to create the entire functionality. Similar to top-down decomposition.

  7. This story of the evolution of event-driven programming is told from the perspective of a business applications programmer who started programming in the late 1970's, worked mostly on IBM and Microsoft platforms, and most recently began working with Java and Python on Unix platforms.

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