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<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" type="topic" id="tech-gdk" xml:lang="de">
<info>
<link type="guide" xref="tech" group="gdk"/>
<desc>Low-level abstraction for the windowing system</desc>
<revision pkgversion="3.0" date="2011-04-05" status="candidate"/>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Mario Blättermann</mal:name>
<mal:email>mario.blaettermann@gmail.com</mal:email>
<mal:years>2009-2012</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Christian Kirbach</mal:name>
<mal:email>christian.kirbach@gmail.com</mal:email>
<mal:years>2011, 2012.</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Aljosha Papsch</mal:name>
<mal:email>al@rpapsch.de</mal:email>
<mal:years>2012</mal:years>
</mal:credit>
</info>
<title>GDK</title>
<p>GDK is the low-level library used by <link xref="tech-gtk">GTK+</link> to
interact with the windowing system for graphics and input devices. Although
you will rarely use GDK directly in application code, it contains all the
necessary functionality to create low-level windows in the the screen and to
interact with the user with various input devices. GDK acts as an abstraction
over various windowing systems, so that GTK+ can be portable to all of them:
the X Window System (X11), Microsoft Windows, Mac OS X Quartz.</p>
<p>GDK enables you to access events from keyboards, mice, and other
input devices. Implementations of widgets in GTK+ use this functionality, and
translate the events into higher-level signals that can in turn be used from
application code. For example, a <code>GtkButton</code> widget will track
<code>GDK_BUTTON_PRESS</code> and <code>GTK_BUTTON_RELEASE</code> events,
which come from the mouse, and translate them as appropriate into a
<code>GtkButton::clicked</code> signal when the user presses and releases
the button in the right location.</p>
<p>GDK also provides low-level routines to access drag and drop
and clipboard data from the system. When implementing custom controls,
you may need to access these features to implement proper user interaction
behavior.</p>
<p>GDK stellt andere Funktionalitäten bereit, die zum Implementieren eines vollständigen grafischen Toolkits wie GTK+ nötig sind. Weil GDK als Abstraktionsplattform dient, ermöglicht es GTK+ unter mehreren Umgebungen zu laufen. Es verfügt über eine Schnittstelle für all die von GTK+ benötigten Systemfunktionalitäten. Darunter fallen Informationen über Betrieb mit mehreren Bildschirmen, Auflösung und Farbtiefe, Farbtabellen und Mauszeiger.</p>
<p>You should use GDK whenever you need low-level access to the underlying
windowing system, including low-level access to events, windows, and the
clipboard. Using GDK for these tasks ensures that your code is portable and
integrates with the rest of your GTK+ code. The simple drawing routines in
GDK should generally not be used; these are a left-over from when GDK simply
wrapped the windowing system's drawing primitives. Instead, you should use
the extensive functionality provided by <link xref="tech-cairo">Cairo</link>
to draw high-quality 2D graphics.</p>
<list style="compact">
<item><p><link href="https://developer.gnome.org/gdk3/stable/">GDK Reference Manual</link></p></item>
</list>
</page>
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