March 2018
Intermediate to advanced
992 pages
23h 26m
German
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Kapitel 18
Event-Verarbeitung
Ganz allgemein ist ein Event ein Ereignis, das zu einem unbestimmten Zeitpunkt (asynchron) eintritt. Typische Events sind:
■ das Klicken einer Maustaste, wenn der Mauszeiger an einer bestimmten Stelle des Bildschirms ist
■ das Betätigen einer Tastenkombination auf der Tastatur
In einem Event-gesteuerten Programm mit grafischer Benutzungsoberfläche löst ein Event ein bestimmtes Systemverhalten aus, das in einer speziellen Prozedur, einem so genannten Eventhandler, definiert ist.
Sie kennen die Event-Verarbeitung bereits im Zusammenhang mit Buttons. Denn auch das Anklicken eines Buttons ist ein Event. In der command-Option des Button-Widgets ist eine Funktion oder Methode spezifiziert, die beim Eintritt dieses Events ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.