Glossary
- icon
- A small picture that represents some functionality in a computer
program. A user clicks on an icon to cause an action to be performed
by a program.
- widget
- A visual element of a graphical user interface that allows a user to
give commands to an executing program. Example widgets include a
command button, a slider bar, or a list box.
- graphical user interface
- A user interacts with a computer program by pointing, clicking, and
dragging icons and widgets in a window on a computer screen.
- GUI
- An abbreviation for a “graphical user interface.”
- event-driven programming
- A program that only executes tasks when a user specially requests a task.
- event loop
- A built-in function of a GUI toolkit that “listens” for operating
system events and then calls an appropriate event-handler for each event.
- event-handler
- A function that processes an event. These functions are also called
callback functions.