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<a name="sec-drag_and_drop_copy"></a>Copy</h2></div></div></div>
<p>
When the user asks to copy some data, you should tell the
<code class="classname">Clipboard</code> what targets are available, and provide the
callback methods that it can use to get the data. At this point you should
store a copy of the data, to be provided when the clipboard calls your callback
method in repsonse to a paste.
</p>
<p>For instance,
</p>
<pre class="programlisting">Glib::RefPtr<Gtk::Clipboard> refClipboard = Gtk::Clipboard::get();
//Targets:
std::list<Gtk::TargetEntry> listTargets;
listTargets.push_back( Gtk::TargetEntry("example_custom_target") );
listTargets.push_back( Gtk::TargetEntry("UTF8_STRING") );
refClipboard->set( listTargets,
sigc::mem_fun(*this, &ExampleWindow::on_clipboard_get),
sigc::mem_fun(*this, &ExampleWindow::on_clipboard_clear) );</pre>
<p>Your callback will then provide the store data when the user chooses to paste the data. For instance:
</p>
<pre class="programlisting">void ExampleWindow::on_clipboard_get(
Gtk::SelectionData& selection_data, guint info)
{
const Glib::ustring target = selection_data.get_target();
if(target == "example_custom_target")
selection_data.set("example_custom_target", m_ClipboardStore);
}</pre>
<p>
The <code class="literal">ideal</code> example below can supply more than one clipboard target.
</p>
<p>The clear callback allows you to free the memory used by your stored data when the clipboard replaces its data with something else.
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