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<?xml version="1.0" encoding="utf-8"?>
<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" id="tech-gdk" xml:lang="pt-BR">
<info>
<link type="guide" xref="tech" group="gdk"/>
<revision pkgversion="3.0" date="2011-04-05" status="candidate"/>
<credit type="author copyright">
<name>Shaun McCance</name>
<email its:translate="no">shaunm@gnome.org</email>
<years>2011–2012</years>
</credit>
<include xmlns="http://www.w3.org/2001/XInclude" href="cc-by-sa-3-0.xml"/>
<desc>Abstração de baixo nível para sistema de janela</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Enrico Nicoletto</mal:name>
<mal:email>liverig@gmail.com</mal:email>
<mal:years>2009</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Rafael Fontenelle</mal:name>
<mal:email>rafaelff@gnome.org</mal:email>
<mal:years>2013, 2014, 2016, 2017</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Isaac Ferreira Filho</mal:name>
<mal:email>isaacmob@riseup.net</mal:email>
<mal:years>2018</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 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>GDK_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 também oferece rotinas de baixo nível para acessar dados do arrastar-e-soltar e da área de transferência do sistema. Quando implementados controles customizados, você poderá precisar acessar esses recursos para implementar um próprio comportamento de interação com o usuário.</p>
<p>GDK provides other functionality which is needed to implement
a complete graphical toolkit like GTK. Since GDK acts as a platform
abstraction, allowing GTK to run under multiple environments, it
provides an API for all of the system functionality needed by GTK.
This includes information about multi-head displays, resolution and
color depth, colormaps, and cursors.</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/">Manual de referência do GDK</link></p></item>
</list>
</page>
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