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<div class="sect1" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-using_a_gtkmm_widget"></a>Using a <span class="application">gtkmm</span> widget</h2></div></div></div>
<p>
Our examples all tend to have the same structure. They follow these steps
for using a <code class="classname">Widget</code>:
</p>
<p>
</p>
<div class="orderedlist"><ol type="1">
<li><p>
Declare a variable of the type of <code class="classname">Widget</code> you wish to
use, generally as member variable of a derived container class. You could also
declare a pointer to the widget type, and then create it with
<code class="literal">new</code> in your code. Even when using the widget via a pointer,
it's still probably best to make that pointer a member variable of a container
class so that you can access it later.
</p></li>
<li><p>
Set the attributes of the widget. If the widget has no default constructor, then you will need to initialize the widget in the initalizer list of your container class's constructor.
</p></li>
<li><p>
Connect any signals you wish to use to the appropriate handlers.
</p></li>
<li><p>
Pack the widget into a container using the appropriate call,
e.g. <code class="function">Gtk::Container::add()</code> or
<code class="function">pack_start()</code>.
</p></li>
<li><p>
Call <code class="function">show()</code> to display the widget.
</p></li>
</ol></div>
<p>
</p>
<p>
<code class="function">Gtk::Widget::show()</code> lets <span class="application">gtkmm</span> know that we have
finished setting the attributes of the widget, and that it is ready to be
displayed. You can use <code class="function">Gtk::Widget::hide()</code> to make it
disappear again. The order in which you show the widgets is not important, but
we do suggest that you show the top-level window last; this way, the whole
window will appear with its contents already drawn. Otherwise, the user will
first see a blank window, into which the widgets will be gradually drawn.
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