</h3>          <p>            The event box widget may be the simplest container in            GTK+; its only purpose is to have a <span class=             "STRUCTNAME">GdkWindow</span>. Certain operations only            work on widgets with windows (such as setting the            background color, or capturing events); if you want to            perform these operations on a windowless widget, you            can place the widget in an event box and perform the            operations on the event box, achieving much the same            effect.          </p>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z369"><tt class="CLASSNAME">          GtkHandleBox</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z370">Library</a>          </h3>          <p>            GTK+          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z371">Header File</a>          </h3>          <p>            <tt class="FILENAME">gtk/gtkhandlebox.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z372">Description</a>          </h3>          <p>            The handle box widget can be adds a handle to a child            widget; by dragging on the handle, the child can be            removed from the window and positioned elsewhere on the            user's desktop. The handle box is often used for            toolbars. <tt class="CLASSNAME">GnomeDock</tt> and <tt            class="CLASSNAME">GnomeDockItem</tt> offer a more            flexible (but more elaborate) alternative.          </p>          <div class="FIGURE">            <a name="Z373"></a>            <p>              <img src="figures/gtkhandlebox.png">            </p>            <p>              <b>Figure 12. A torn-off <tt class="CLASSNAME">              GtkHandleBox</tt> containing a toolbar, alongside its              original parent window.</b>            </p>          </div>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z374"><tt class="CLASSNAME">          GtkScrolledWindow</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z375">Library</a>          </h3>          <p>            GTK+          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z376">Header File</a>          </h3>          <p>            <tt class="FILENAME">gtk/gtkscrolledwindow.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z377">Description</a>          </h3>          <p>            <tt class="CLASSNAME">GtkScrolledWindow</tt> provides            horizontal and vertical scrollbars for its child            widget. Optionally, the scrollbars are hidden when the            entire child is visible. If a child widget has a <span            class="STRUCTNAME">set_scroll_adjustments_signal</span>            in its <tt class="CLASSNAME">GtkWidgetClas</tt> (see <a            href="z144.html#SEC-OVERRIDESIGNALS">the section called            <i>Overridable Signals</i> in the chapter called <i>            Writing a <tt class="CLASSNAME">            GtkWidget</tt></i></a>), the scrolled window uses them            as the adjustments for the scrollbars. Otherwise, the            scrolled window scrolls the entire widget using a <tt            class="CLASSNAME">GtkViewport</tt>. (Consider <tt            class="CLASSNAME">GtkCList</tt> for example; the column            titles aren't scrolled, only the list contents. Thus            <tt class="CLASSNAME">GtkCList</tt> provides scroll            adjustment signals.)          </p>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z378"><tt class="CLASSNAME">GtkViewport</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z379">Library</a>          </h3>          <p>            GTK+          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z380">Header File</a>          </h3>          <p>            <tt class="FILENAME">gtk/gtkviewport.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z381">Description</a>          </h3>          <p>            <tt class="CLASSNAME">GtkViewport</tt> is more or less            an implementation detail of <tt class="CLASSNAME">            GtkScrolledWindow</tt>. It contains a widget that does            not provide a <span class="STRUCTNAME">            set_scroll_adjustments_signal</span>, and provides such            a signal on the child widget's behalf. See <tt class=             "CLASSNAME">GtkScrolledWindow</tt> for more details.          </p>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z382"><tt class="CLASSNAME">GtkBox</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z383">Library</a>          </h3>          <p>            GTK+          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z384">Header File</a>          </h3>          <p>            <tt class="FILENAME">gtk/gtkbox.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z385">Description</a>          </h3>          <p>            <tt class="CLASSNAME">GtkBox</tt> is an abstract base            class for <tt class="CLASSNAME">GtkVBox</tt>, <tt            class="CLASSNAME">GtkHBox</tt>, and <tt class=            "CLASSNAME">GtkButtonBox</tt>. It's an invisible layout            container; <a href="cha-gtk.html">the chapter called            <i>GTK+ Basics</i></a> describes it in some detail.          </p>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z386"><tt class="CLASSNAME">GtkHBox</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z387">Library</a>          </h3>          <p>            GTK+          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z388">Header File</a>          </h3>          <p>            <tt class="FILENAME">gtk/gtkhbox.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z389">Description</a>          </h3>          <p>            <tt class="CLASSNAME">GtkHBox</tt> is a <tt class=             "CLASSNAME">GtkBox</tt> that packs widgets from left to            right. The left side is considered the "start" of the            box.          </p>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z390"><tt class="CLASSNAME">GnomeAppBar</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z391">Library</a>          </h3>          <p>            Gnome          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z392">Header File</a>          </h3>          <p>            <tt class="FILENAME">libgnomeui/gnome-appbar.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z393">Description</a>          </h3>          <p>            <tt class="CLASSNAME">GnomeAppBar</tt> is a simple            status bar with an optional progress meter. It does not            have "contexts" like <tt class="CLASSNAME">            GtkStatusbar</tt>. <a href="z91.html#SEC-APPBAR">the            section called <i><tt class="CLASSNAME">            GnomeAppBar</tt></i> in the chapter called <i>The Main            Window: <tt class="CLASSNAME">GnomeApp</tt></i></a>            gives more details.          </p>          <div class="FIGURE">            <a name="Z394"></a>            <p>              <img src="figures/gnomeappbar.png">            </p>            <p>              <b>Figure 13. <tt class="CLASSNAME">GnomeAppBar</tt>              with the optional progress bar turned on.</b>            </p>          </div>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z395"><tt class="CLASSNAME">          GnomeDateEdit</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z396">Library</a>          </h3>          <p>            Gnome          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z397">Header File</a>          </h3>          <p>            <tt class="FILENAME">libgnomeui/gnome-dateedit.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z398">Description</a>          </h3>          <p>            <tt class="CLASSNAME">GnomeDateEdit</tt> allows the            user to edit a date and time. The time-editing part can            be turned off if you are only interested in the date.          </p>          <div class="FIGURE">            <a name="Z399"></a>            <p>              <img src="figures/gnomedateedit.png">            </p>            <p>              <b>Figure 14. <tt class="CLASSNAME">              GnomeDateEdit</tt></b>            </p>          </div>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z400"><tt class="CLASSNAME">GtkCombo</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z401">Library</a>          </h3>          <p>            GTK+          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z402">Header File</a>          </h3>          <p>            <tt class="FILENAME">gtk/gtkcombo.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z403">Description</a>          </h3>          <p>            <tt class="CLASSNAME">GtkCombo</tt> is a text entry box            with a drop-down menu "quick choices." If you want to            limit the user to a fixed set of options, a <tt class=             "CLASSNAME">GtkOptionMenu</tt> is more appropriate. <tt            class="CLASSNAME">GtkCombo</tt> allows the user to type            in anything, but offers some suggestions as well. <tt            class="CLASSNAME">GnomeEntry</tt> is a combo box that            adds items the user types in to the list of choices in            the drop-down menu, and automatically remembers the            list from session to session.          </p>          <div class="FIGURE">            <a name="Z404"></a>            <p>              <img src="figures/gtkcombo.png">            </p>            <p>              <b>Figure 15. <tt class="CLASSNAME">GtkCombo</tt></b>            </p>          </div>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z405"><tt class="CLASSNAME">GnomeEntry</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z406">Library</a>          </h3>          <p>            Gnome          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z407">Header File</a>          </h3>          <p>            <tt class="FILENAME">libgnomeui/gnome-entry.h</tt>          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z408">Description</a>          </h3>          <p>            <tt class="CLASSNAME">GnomeEntry</tt> is a <tt class=             "CLASSNAME">GtkCombo</tt> extension that uses the            drop-down menu as a history. If the user types            something which isn't in the history already, <tt            class="CLASSNAME">GnomeEntry</tt> adds it and saves it            in a configuration file to be loaded next time the            application starts up.          </p>        </div>      </div>      <div class="SECT2">        <h2 class="SECT2">          <a name="Z409"><tt class="CLASSNAME">          GnomeFileEntry</tt></a>        </h2>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z410">Library</a>          </h3>          <p>            Gnome          </p>        </div>        <div class="SECT3">          <h3 class="SECT3">            <a name="Z411">Header File</a>          </h3>          <p>            <tt c