libgnomeui</tt></a>          </h3>          <p>            <tt class="APPLICATION">libgnomeui</tt> collects            GUI-related Gnome code. It consists primarily of            widgets designed to enhance and extend GTK+. Gnome            widgets generally impose user interface policy, which            permits a more convenient API (since there is less for            the programmer to specify). It also results in            applications with more consistent interfaces, of            course.          </p>          <p>            Highlights of <tt class="APPLICATION">libgnomeui</tt>            include:          </p>          <ul>            <li>              <p>                The <tt class="CLASSNAME">GnomeApp</tt> widget,                which makes it easy to create a nice main window                for your application. It uses another widget called                <tt class="CLASSNAME">GnomeDock</tt> which enables                users to rearrange and "undock" toolbars.              </p>            </li>            <li>              <p>                The <tt class="CLASSNAME">GnomeCanvas</tt> widget                which makes it easy to write intricate,                flicker-free custom displays.              </p>            </li>            <li>              <p>                The Gnome stock pixmaps (icons for open, close,                save, and other operations).              </p>            </li>            <li>              <p>                Convenient routines for creating and using dialogs.              </p>            </li>            <li>              <p>                The <tt class="CLASSNAME">GnomePixmap</tt> widget                which is more versatile than <tt class="CLASSNAME">                GtkPixmap</tt>.              </p>            </li>          </ul>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z13"><tt class="APPLICATION">            libgnorba</tt></a>          </h3>          <p>            <tt class="APPLICATION">libgnorba</tt> provides            CORBA-related facilities, including a security            mechanism and object activation. (Object activation is            the process of obtaining a reference to an object that            implements a given interface; it can involve executing            a server program, loading a shared library module, or            asking an existing program for a new object instance.)          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z14"><tt class="APPLICATION">libzvt</tt></a>          </h3>          <p>            This small library contains a terminal widget (<tt            class="CLASSNAME">ZvtTerm</tt>) you can use in your            Gnome programs.          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z15"><tt class="APPLICATION">            libart_lgpl</tt></a>          </h3>          <p>            This library contains graphics rendering routines by            Raph Levien. The routines included here are released            under the GNU Library General Public License and used            in the <tt class="CLASSNAME">GnomeCanvas</tt> widget;            Raph Levien also sells an enhanced proprietary version.            <tt class="APPLICATION">libart_lgpl</tt> provides            antialiasing, microtile refresh regions, and other            magic. In essence it is a vector graphics rasterization            library, functionally analogous to the PostScript            language.          </p>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z16">Other Libraries</a>        </h2>        <p>          These libraries are commonly used in Gnome applications,          but are not a part of <tt class="APPLICATION">          gnome-libs</tt> proper.        </p>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z17"><tt class="APPLICATION">            gnome-print</tt></a>          </h3>          <p>            <tt class="APPLICATION">gnome-print</tt> is still            somewhat experimental, but very promising. It uses <tt            class="APPLICATION">libart_lgpl</tt> and works nicely            with <tt class="CLASSNAME">GnomeCanvas</tt>. It            provides virtual output devices (called "print            contexts"), so a single codebase can output to a print            preview widget, to PostScript, and eventually to other            printer formats. <tt class="APPLICATION">            gnome-print</tt> also includes printing-related GUI            elements, like a print setup dialog, and a virtual font            interface (to deal with the problem that X fonts are            not printable).          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z18"><tt class="APPLICATION">            gnome-xml</tt></a>          </h3>          <p>            <tt class="APPLICATION">gnome-xml</tt> is a            non-validating XML engine written by Daniel Veillard of            the World Wide Web Consortium. It can parse XML into a            tree structure, and output a tree structure as XML.            It's useful for any application that needs to load and            save structured data; many Gnome applications use it as            a file format. This library does not depend on any of            the others, not even glib --- so it is tied to Gnome in            name only. However, you can expect most Gnome users to            have it installed, so it should not inconvenience your            users if your application uses this library.          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z19">Guile</a>          </h3>          <p>            Guile is an implementation of the Scheme programming            language in a library, so that any application can have            an embedded Scheme interpreter. It is the official            extension language of the GNU Project, and is used by            several Gnome applications. Adding an extension            language to your application might sound complex, but            Guile makes it almost trivial. (Several Gnome            applications support Perl and Python as well; it is            usually easy to support several languages once you            implement the first. But Guile has a special place in            the Gnome developer's hearts.)          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z20">Bonobo</a>          </h3>          <p>            At press time, the Gnome hackers were putting the            finishing touches on Bonobo. Bonobo is a compound            document architecture in the tradition of Microsoft's            OLE; it allows you to embed charts in spreadsheets, for            example. It will be used pervasively throughout Gnome;            any application will be able to display MIME-typed data            such as plain text, HTML, or images by asking the Gnome            libraries for an appropriate Bonobo component. Look for            Bonobo technology in the next major Gnome release.          </p>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z21">A Word About Header Files</a>        </h2>        <p>          Throughout the book, the exact header file which declares          each function is given alongside the function prototype.          This is to facilitate your exploration of the source          code. However, you probably don't want to manually          include the hundreds of headers found in GTK+ and Gnome.          You can include all GTK+ headers <i class="EMPHASIS">en          masse</i> by including the <tt class="FILENAME">          gtk/gtk.h</tt> header file. <tt class="FILENAME">          gtk/gtk.h</tt> also includes <tt class="FILENAME">          gdk/gdk.h</tt> for you. You can include all Gnome headers          by including <tt class="FILENAME">gnome.h</tt>; <tt          class="FILENAME">gnome.h</tt> includes <tt class=          "FILENAME">gtk/gtk.h</tt> for you. Most Gnome application          files simply include <tt class="FILENAME">gnome.h</tt>.        </p>      </div>    </div>    <div class="NAVFOOTER">      <br>      <br>      <table width="100%" border="0" bgcolor="#ffffff" cellpadding=       "1" cellspacing="0">        <tr>          <td width="25%" bgcolor="#ffffff" align="left">            <a href="z2.html"><font color="#0000ff" size="2"><b>            &lt;&lt;&lt; Previous</b></font></a>          </td>          <td width="25%" colspan="2" bgcolor="#ffffff" align=           "center">            <font color="#0000ff" size="2"><b><a href="ggad.html">            <font color="#0000ff" size="2"><b>            Home</b></font></a></b></font>          </td>          <td width="25%" bgcolor="#ffffff" align="right">            <a href="z22.html"><font color="#0000ff" size="2"><b>            Next &gt;&gt;&gt;</b></font></a>          </td>        </tr>        <tr>          <td colspan="2" align="left">            <font color="#000000" size="2"><b>            Introduction</b></font>          </td>          <td colspan="2" align="right">            <font color="#000000" size="2"><b>Structure of the            Book</b></font>          </td>        </tr>      </table>    </div>  </body></html>