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<p>
<code class="classname">Widgets</code> can be identified as sources or destinations
using these <code class="classname">Gtk::Widget</code> methods:
</p>
<pre class="programlisting">void drag_source_set(const ArrayHandle_TargetEntry& targets,
GdkModifierType start_button_mask, GdkDragAction actions);</pre>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
<code class="literal">targets</code> is a container of
<code class="classname">Gtk::TargetEntry</code>
(<code class="classname">std::list<Gtk::TargetEntry></code> or
<code class="classname">std::vector<Gtk::TargetEntry></code>, for
instance) elements.
</p></li>
<li class="listitem"><p>
<code class="literal">start_button_mask</code> is an ORed combination of values,
which specify which modifier key or mouse button must be pressed to
start the drag.
</p></li>
<li class="listitem"><p>
<code class="literal">actions</code> is an ORed combination of values, which
specified which Drag and Drop operations will be possible from this
source - for instance, copy, move, or link. The user can choose between
the actions by using modifier keys, such as <span class="keycap"><strong>Shift</strong></span> to
change from <code class="literal">copy</code> to <code class="literal">move</code>, and
this will be shown by a different cursor.
</p></li>
</ul></div>
<pre class="programlisting">void drag_dest_set(const ArrayHandle_TargetEntry& targets,
GtkDestDefaults flags, GdkDragAction actions);</pre>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
<code class="literal">flags</code> is an ORed combination of values which
indicates how the widget will respond visually to Drag and Drop items.
</p></li>
<li class="listitem"><p>
<code class="literal">actions</code> indicates the Drag and Drop actions which
this destination can receive - see the description above.
</p></li>
</ul></div>
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