E

em

In typography, a length equal to the point size of the current type. This is usually roughly the length of an uppercase M.

emission

(signal) The entire procedure that takes place when emitting a signal.

emission hook

Like a signal handler, but bound to an entire class, not just to one object at a time. Use a hook if you don't particularly care about the signal emission's object.

emit

(a signal ) Emitting a signal on an object causes all signal handlers bound to that signal on the object to run. These handlers return values; normally, the last handler's return value goes back to the code that called the signal. If you need more than one return value, use an accumulator .

event

1. In general, an event is something that happens, such as a signal emission. 2. In GTK+, events primarily come from the user 's input stream and go to windows . Events are not the same as signals (however, GTK+ does use signals to send events to GtkWidget objects).

event-driven programming

In the classic programming model, you write a program that executes from start to finish; the user may enter data along the way if necessary, possibly changing program flow somewhat. In event-driven programming, the program primarily reacts to user input, doing little when the input stream is inactive (that is, there are no events ). In general, GUI applications are event driven.