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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ComboBox with an Entry</title>
<link rel="stylesheet" href="style.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
<link rel="home" href="index.html" title="Programming with gtkmm 3">
<link rel="up" href="chapter-combobox.html" title="Chapter 10. Combo Boxes">
<link rel="prev" href="combobox-example-simple.html" title="Simple Text Example">
<link rel="next" href="chapter-textview.html" title="Chapter 11. TextView">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr><th colspan="3" align="center">ComboBox with an Entry</th></tr>
<tr>
<td width="20%" align="left">
<a accesskey="p" href="combobox-example-simple.html"><img src="icons/prev.png" alt="Prev"></a> </td>
<th width="60%" align="center">Chapter 10. Combo Boxes</th>
<td width="20%" align="right"> <a accesskey="n" href="chapter-textview.html"><img src="icons/next.png" alt="Next"></a>
</td>
</tr>
</table>
<hr>
</div>
<div class="sect1" title="ComboBox with an Entry">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-comboboxentry"></a>ComboBox with an Entry</h2></div></div></div>
<p>A <code class="classname">ComboBox</code> may contain an <code class="classname">Entry</code> widget for entering of arbitrary text, by specifying true for the constructor's <code class="literal">has_entry</code> parameter.</p>
<div class="sect2" title="The text column">
<div class="titlepage"><div><div><h3 class="title">
<a name="sec-comboboxentry-text-column"></a>The text column</h3></div></div></div>
<p>So that the Entry can interact with the drop-down list of choices, you must specify which of your model columns is the text column, with <code class="methodname">set_text_column()</code>. For instance:
</p>
<pre class="programlisting">m_combo.set_text_column(m_columns.m_col_name);</pre>
<p>
</p>
<p>
When you select a choice from the drop-down menu, the value from this column will be placed in the <code class="classname">Entry</code>.
</p>
</div>
<div class="sect2" title="The entry">
<div class="titlepage"><div><div><h3 class="title">
<a name="sec-comboboxentry-model"></a>The entry</h3></div></div></div>
<p>Because the user may enter arbitrary text, an active model row isn't enough to tell us what text the user has inputted. Therefore, you should retrieve the <code class="classname">Entry</code> widget with the <code class="methodname">ComboBoxEntry::get_entry()</code> method and call <code class="methodname">get_text()</code> on that.
</p>
</div>
<div class="sect2" title="Full Example">
<div class="titlepage"><div><div><h3 class="title">
<a name="comboboxentry-example-full"></a>Full Example</h3></div></div></div>
<div class="figure">
<a name="figure-comboboxentry-complex"></a><p class="title"><b>Figure 10.3. ComboBoxEntry</b></p>
<div class="figure-contents"><div class="screenshot"><div><img src="figures/comboboxentry_complex.png" alt="ComboBoxEntry"></div></div></div>
</div>
<br class="figure-break"><p><a class="ulink" href="http://git.gnome.org/browse/gtkmm-documentation/tree/examples/book/combobox/entry_complex?h=master" target="_top">Source Code</a></p>
<p>File: <code class="filename">examplewindow.h</code> (For use with gtkmm 3, not gtkmm 2)
</p>
<pre class="programlisting">
#ifndef GTKMM_EXAMPLEWINDOW_H
#define GTKMM_EXAMPLEWINDOW_H

#include &lt;gtkmm/window.h&gt;
#include &lt;gtkmm/combobox.h&gt;
#include &lt;gtkmm/liststore.h&gt;

class ExampleWindow : public Gtk::Window
{
public:
  ExampleWindow();
  virtual ~ExampleWindow();

protected:
  //Signal handlers:
  void on_combo_changed();

  //Tree model columns:
  class ModelColumns : public Gtk::TreeModel::ColumnRecord
  {
  public:

    ModelColumns()
    { add(m_col_id); add(m_col_name); }

    Gtk::TreeModelColumn&lt;Glib::ustring&gt; m_col_id; //The data to choose - this must be text.
    Gtk::TreeModelColumn&lt;Glib::ustring&gt; m_col_name;
  };

  ModelColumns m_Columns;

  //Child widgets:
  Gtk::ComboBox m_Combo;
  Glib::RefPtr&lt;Gtk::ListStore&gt; m_refTreeModel;
};

#endif //GTKMM_EXAMPLEWINDOW_H
</pre>
<p>File: <code class="filename">examplewindow.cc</code> (For use with gtkmm 3, not gtkmm 2)
</p>
<pre class="programlisting">
#include "examplewindow.h"
#include &lt;gtkmm/stock.h&gt;
#include &lt;iostream&gt;

ExampleWindow::ExampleWindow()
: m_Combo(true /* has_entry */)
{
  set_title("ComboBox example");

  //Create the Tree model:
  //m_refTreeModel = Gtk::TreeStore::create(m_Columns);
  m_refTreeModel = Gtk::ListStore::create(m_Columns);
  m_Combo.set_model(m_refTreeModel);

  //Fill the ComboBox's Tree Model:
  Gtk::TreeModel::Row row = *(m_refTreeModel-&gt;append());
  row[m_Columns.m_col_id] = "1";
  row[m_Columns.m_col_name] = "Billy Bob";
  /*
  Gtk::TreeModel::Row childrow = *(m_refTreeModel-&gt;append(row.children()));
  childrow[m_Columns.m_col_id] = 11;
  childrow[m_Columns.m_col_name] = "Billy Bob Junior";

  childrow = *(m_refTreeModel-&gt;append(row.children()));
  childrow[m_Columns.m_col_id] = 12;
  childrow[m_Columns.m_col_name] = "Sue Bob";
  */

  row = *(m_refTreeModel-&gt;append());
  row[m_Columns.m_col_id] = "2";
  row[m_Columns.m_col_name] = "Joey Jojo";


  row = *(m_refTreeModel-&gt;append());
  row[m_Columns.m_col_id] = "3";
  row[m_Columns.m_col_name] = "Rob McRoberts";

  /*
  childrow = *(m_refTreeModel-&gt;append(row.children()));
  childrow[m_Columns.m_col_id] = 31;
  childrow[m_Columns.m_col_name] = "Xavier McRoberts";
  */

  //Add the model columns to the Combo (which is a kind of view),
  //rendering them in the default way:
  //This is automatically rendered when we use set_entry_text_column().
  //m_Combo.pack_start(m_Columns.m_col_id);
  m_Combo.pack_start(m_Columns.m_col_name);

  m_Combo.set_entry_text_column(m_Columns.m_col_id);

  //Add the ComboBox to the window.
  add(m_Combo);

  //Connect signal handler:
  m_Combo.signal_changed().connect(sigc::mem_fun(*this,
              &amp;ExampleWindow::on_combo_changed) );

  show_all_children();
}

ExampleWindow::~ExampleWindow()
{
}

void ExampleWindow::on_combo_changed()
{
  Gtk::Entry* entry = m_Combo.get_entry();
  //Note: to get changes only when the entry has been completed,
  //instead of on every key press, connect to Entry::signal_changed()
  //instead of ComboBoxEntry::signal_changed.

  if(entry)
  {
    std::cout &lt;&lt; " ID=" &lt;&lt; entry-&gt;get_text() &lt;&lt; std::endl;
  }
}
</pre>
<p>File: <code class="filename">main.cc</code> (For use with gtkmm 3, not gtkmm 2)
</p>
<pre class="programlisting">
#include "examplewindow.h"
#include &lt;gtkmm/main.h&gt;

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

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

  return 0;
}
</pre>
</div>
<div class="sect2" title="Simple Text Example">
<div class="titlepage"><div><div><h3 class="title">
<a name="comboboxentry-example-simple"></a>Simple Text Example</h3></div></div></div>
<div class="figure">
<a name="figure-comboboxentry-text"></a><p class="title"><b>Figure 10.4. ComboBoxEntryText</b></p>
<div class="figure-contents"><div class="screenshot"><div><img src="figures/comboboxentry_text.png" alt="ComboBoxEntryText"></div></div></div>
</div>
<br class="figure-break"><p><a class="ulink" href="http://git.gnome.org/browse/gtkmm-documentation/tree/examples/book/combobox/entry_text?h=master" target="_top">Source Code</a></p>
<p>File: <code class="filename">examplewindow.h</code> (For use with gtkmm 3, not gtkmm 2)
</p>
<pre class="programlisting">
#ifndef GTKMM_EXAMPLEWINDOW_H
#define GTKMM_EXAMPLEWINDOW_H

#include &lt;gtkmm/window.h&gt;
#include &lt;gtkmm/comboboxtext.h&gt;

class ExampleWindow : public Gtk::Window
{
public:
  ExampleWindow();
  virtual ~ExampleWindow();

protected:
  //Signal handlers:
  void on_combo_changed();

  //Child widgets:
  Gtk::ComboBoxText m_Combo;
};

#endif //GTKMM_EXAMPLEWINDOW_H
</pre>
<p>File: <code class="filename">examplewindow.cc</code> (For use with gtkmm 3, not gtkmm 2)
</p>
<pre class="programlisting">
#include "examplewindow.h"
#include &lt;gtkmm/stock.h&gt;
#include &lt;iostream&gt;

ExampleWindow::ExampleWindow()
: m_Combo(true /* has_entry */)
{
  set_title("ComboBoxText example");

  //Fill the combo:
  m_Combo.append("something");
  m_Combo.append("something else");
  m_Combo.append("something or other");

  add(m_Combo);

  //Connect signal handler:
  m_Combo.signal_changed().connect(sigc::mem_fun(*this,
              &amp;ExampleWindow::on_combo_changed) );

  m_Combo.property_has_frame() = false;
  show_all_children();
}

ExampleWindow::~ExampleWindow()
{
}

void ExampleWindow::on_combo_changed()
{
  Glib::ustring text = m_Combo.get_active_text();
  if(!(text.empty()))
    std::cout &lt;&lt; "Combo changed: " &lt;&lt; text &lt;&lt; std::endl;
}
</pre>
<p>File: <code class="filename">main.cc</code> (For use with gtkmm 3, not gtkmm 2)
</p>
<pre class="programlisting">
#include "examplewindow.h"
#include &lt;gtkmm/main.h&gt;

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

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

  return 0;
}
</pre>
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