Sophie: gtkmm2.4-documentation-2.17.4-1mdv2010.0 noarch

gtkmm2.4-documentation-2.17.4-1mdv2010.0.noarch.rpm

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<th width="60%" align="center">Chapter 16. Drag and Drop</th>
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<div class="sect1" title="Example">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-dnd-example"></a>Example</h2></div></div></div>
<p>Here is a very simple example, demonstrating a drag and drop <code class="literal">Copy</code> operation:</p>
<div class="figure">
<a name="figure-drag-and-drop"></a><p class="title"><b>Figure 16.1. Drag and Drop</b></p>
<div class="figure-contents"><div class="screenshot"><div><img src="figures/drag_and_drop.png" alt="Drag and Drop"></div></div></div>
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<br class="figure-break"><p><a class="ulink" href="http://git.gnome.org/cgit/gtkmm-documentation/tree/examples/book/drag_and_drop" target="_top">Source Code</a></p>
<p>File: <code class="filename">dndwindow.h</code>
</p>
<pre class="programlisting">
#ifndef GTKMM_EXAMPLE_DNDWINDOW_H
#define GTKMM_EXAMPLE_DNDWINDOW_H

#include &lt;gtkmm/label.h&gt;
#include &lt;gtkmm/window.h&gt;
#include &lt;gtkmm/box.h&gt;
#include &lt;gtkmm/button.h&gt;

class DnDWindow : public Gtk::Window
{

public:
  DnDWindow();
  virtual ~DnDWindow();

protected:
  //Signal handlers:
  void on_button_drag_data_get(
          const Glib::RefPtr&lt;Gdk::DragContext&gt;&amp; context,
          Gtk::SelectionData&amp; selection_data, guint info, guint time);
  void on_label_drop_drag_data_received(
          const Glib::RefPtr&lt;Gdk::DragContext&gt;&amp; context, int x, int y,
          const Gtk::SelectionData&amp; selection_data, guint info, guint time);

  //Member widgets:
  Gtk::HBox m_HBox;
  Gtk::Button m_Button_Drag;
  Gtk::Label m_Label_Drop;
};

#endif // GTKMM_EXAMPLE_DNDWINDOW_H
</pre>
<p>File: <code class="filename">dndwindow.cc</code>
</p>
<pre class="programlisting">
#include "dndwindow.h"
#include &lt;iostream&gt;

DnDWindow::DnDWindow()
: m_Button_Drag("Drag Here\n"),
  m_Label_Drop("Drop here\n")
{
  set_title("DnD example");

  add(m_HBox);

  //Targets:
  std::list&lt;Gtk::TargetEntry&gt; listTargets;
  listTargets.push_back( Gtk::TargetEntry("STRING") );
  listTargets.push_back( Gtk::TargetEntry("text/plain") );

  //Drag site:

  //Make m_Button_Drag a DnD drag source:
  m_Button_Drag.drag_source_set(listTargets);

  //Connect signals:
  m_Button_Drag.signal_drag_data_get().connect(sigc::mem_fun(*this,
              &amp;DnDWindow::on_button_drag_data_get));

  m_HBox.pack_start(m_Button_Drag);

  //Drop site:

  //Make m_Label_Drop a DnD drop destination:
  m_Label_Drop.drag_dest_set(listTargets);

  //Connect signals:
  m_Label_Drop.signal_drag_data_received().connect(sigc::mem_fun(*this,
              &amp;DnDWindow::on_label_drop_drag_data_received) );

  m_HBox.pack_start(m_Label_Drop);

  show_all();
}

DnDWindow::~DnDWindow()
{
}

void DnDWindow::on_button_drag_data_get(
        const Glib::RefPtr&lt;Gdk::DragContext&gt;&amp;,
        Gtk::SelectionData&amp; selection_data, guint, guint)
{
  selection_data.set(selection_data.get_target(), 8 /* 8 bits format */,
          (const guchar*)"I'm Data!",
          9 /* the length of I'm Data! in bytes */);
}

void DnDWindow::on_label_drop_drag_data_received(
        const Glib::RefPtr&lt;Gdk::DragContext&gt;&amp; context, int, int,
        const Gtk::SelectionData&amp; selection_data, guint, guint time)
{
  const int length = selection_data.get_length();
  if((length &gt;= 0) &amp;&amp; (selection_data.get_format() == 8))
  {
    std::cout &lt;&lt; "Received \"" &lt;&lt; selection_data.get_data_as_string()
        &lt;&lt; "\" in label " &lt;&lt; std::endl;
  }

  context-&gt;drag_finish(false, false, time);
}
</pre>
<p>File: <code class="filename">main.cc</code>
</p>
<pre class="programlisting">
#include &lt;gtkmm/main.h&gt;
#include "dndwindow.h"

int main (int argc, char *argv[])
{
  Gtk::Main kit(argc, argv);

  DnDWindow dndWindow;
  //Shows the window and returns when it is closed.
  Gtk::Main::run(dndWindow);

  return 0;
}
</pre>
<p>
There is a more complex example in examples/dnd.
</p>
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<td width="40%" align="right" valign="top"> Chapter 17. The Clipboard</td>
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