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<div class="sect1" title="Paste">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-clipboard-paste"></a>Paste</h2></div></div></div>
<p>
When the user asks to paste data from the <code class="classname">Clipboard</code>, you
should request a specific format and provide a callback method which will be
called with the actual data. For instance:
</p>
<pre class="programlisting">refClipboard->request_contents("example_custom_target",
sigc::mem_fun(*this, &ExampleWindow::on_clipboard_received) );</pre>
<p>Here is an example callback method:
</p>
<pre class="programlisting">void ExampleWindow::on_clipboard_received(
const Gtk::SelectionData& selection_data)
{
Glib::ustring clipboard_data = selection_data.get_data_as_string();
//Do something with the pasted data.
}</pre>
<div class="sect2" title="Discovering the available targets">
<div class="titlepage"><div><div><h3 class="title">
<a name="dnd-discovering-targets"></a>Discovering the available targets</h3></div></div></div>
<p>
To find out what targets are currently available on the
<code class="classname">Clipboard</code> for pasting, call the
<code class="methodname">request_targets()</code> method, specifying a method to be called
with the information. For instance:
</p>
<pre class="programlisting">refClipboard->request_targets( sigc::mem_fun(*this,
&ExampleWindow::on_clipboard_received_targets) );</pre>
<p>
In your callback, compare the list of available targets with those that your application supports for pasting. You could enable or disable a Paste menu item, depending on whether pasting is currently possible. For instance:
</p>
<pre class="programlisting">void ExampleWindow::on_clipboard_received_targets(
const Glib::StringArrayHandle& targets_array)
{
// Get the list of available clipboard targets:
std::list<std::string> targets = targets_array;
const bool bPasteIsPossible =
std::find(targets.begin(), targets.end(),
example_target_custom) != targets.end();
// Enable/Disable the Paste button appropriately:
m_Button_Paste.set_sensitive(bPasteIsPossible);
}</pre>
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