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<div class="chapter">
<div class="titlepage"><div><div><h1 class="title">
<a name="chapter-dialogs"></a>Chapter 17. Dialogs</h1></div></div></div>
<div class="toc">
<p><b>Table of Contents</b></p>
<ul class="toc">
<li><span class="section"><a href="chapter-dialogs.html#sec-dialogs-alertdialog">AlertDialog and MessageDialog</a></span></li>
<li><span class="section"><a href="sec-dialogs-filedialog.html">FileDialog and FileChooserDialog</a></span></li>
<li><span class="section"><a href="sec-dialogs-colordialog.html">ColorDialog and ColorChooserDialog</a></span></li>
<li><span class="section"><a href="sec-dialogs-fontdialog.html">FontDialog and FontChooserDialog</a></span></li>
<li><span class="section"><a href="sec-about-dialog.html">Non-modal AboutDialog</a></span></li>
<li><span class="section"><a href="sec-dialogs-windowdialog.html">Custom Dialog</a></span></li>
</ul>
</div>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="icons/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top">
<p><code class="classname">Gtk::Dialog</code> and the classes derived from it,
are deprecated since <span class="application">gtkmm</span> 4.10. They can still be used in <span class="application">gtkmm</span>4 applications,
provided GTKMM_DISABLE_DEPRECATED and GDKMM_DISABLE_DEPRECATED are not defined.
Some of the dialog classes are replaced by classes that are available since <span class="application">gtkmm</span> 4.10.
</p>
<p>The examples in this chapter use classes that are available since <span class="application">gtkmm</span> 4.10.
Similar examples with the deprecated classes are available in the
<a class="ulink" href="https://gitlab.gnome.org/GNOME/gtkmm-documentation/tree/gtkmm-4-0/examples/book/dialogs/" target="_top">
gtkmm-4-0 branch</a> in the git repository.
</p>
</td></tr>
</table></div>
<p>
Dialogs are used as secondary windows, to provide specific information or to
ask questions. <code class="classname">Gtk::Dialog</code> windows contain a few pre-packed
widgets to ensure consistency, and a <code class="literal">response</code> signal which
is emitted when the user dismisses the dialog.
</p>
<p>
There are several derived <code class="classname">Dialog</code> classes which you might
find useful. <code class="classname">Gtk::MessageDialog</code> is used for most simple
notifications. But at other times you might need to derive your own dialog
class to provide more complex functionality.
</p>
<p>
To pack widgets into a custom dialog, you should pack them into the
<code class="classname">Gtk::Box</code>, available via
<code class="methodname">get_content_area()</code>. To just add a <code class="classname">Button</code>
to the bottom of the <code class="classname">Dialog</code>, you could use the
<code class="methodname">add_button()</code> method.
</p>
<p>
The <code class="literal">response</code> signal handler receives an <code class="literal">int</code>. This
may be a value from the <span class="type">Gtk::ResponseType</span> if the user
closed the dialog by clicking a standard button, or it could be the custom
response value that you specified when using <code class="methodname">add_button()</code>.
</p>
<p>
To show the dialog, call <code class="methodname">set_visible(true)</code>. If the same dialog instance
will be shown several times, you must also call <code class="methodname">set_hide_on_close()</code>,
or else the dialog will be destroyed when it's closed.
Connect to the <code class="literal">response</code> signal, if you want to know which button
was pressed. The <code class="literal">response</code> signal handler is also where you
should hide the dialog.
</p>
<p><a class="ulink" href="https://gnome.pages.gitlab.gnome.org/gtkmm/classGtk_1_1Dialog.html" target="_top">Reference</a></p>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-dialogs-alertdialog"></a>AlertDialog and MessageDialog</h2></div></div></div>
<p>
<code class="classname">MessageDialog</code> (deprecated since <span class="application">gtkmm</span> 4.10) and
<code class="classname">AlertDialog</code> (available since <span class="application">gtkmm</span> 4.10) are convenience
classes, used to create simple, standard message dialogs, with a message and buttons
for user response.
</p>
<p><a class="ulink" href="https://gnome.pages.gitlab.gnome.org/gtkmm/classGtk_1_1AlertDialog.html" target="_top">AlertDialog Reference</a></p>
<p><a class="ulink" href="https://gnome.pages.gitlab.gnome.org/gtkmm/classGtk_1_1MessageDialog.html" target="_top">MessageDialog Reference</a></p>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="alertdialog-example"></a>Example</h3></div></div></div>
<div class="figure">
<a name="figure-dialogs-alertdialog"></a><p class="title"><b>Figure 17.1. AlertDialog</b></p>
<div class="figure-contents">
<div class="screenshot">
<div class="mediaobject"><img src="figures/dialogs_alertdialog.png" alt="AlertDialog"></div>
</div>
</div>
</div>
<br class="figure-break">
<p><a class="ulink" href="https://gitlab.gnome.org/GNOME/gtkmm-documentation/tree/master/examples/book/dialogs/alertdialog" target="_top">Source Code</a></p>
<p>File: <code class="filename">examplewindow.h</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#ifndef GTKMM_EXAMPLEWINDOW_H
#define GTKMM_EXAMPLEWINDOW_H
#include <gtkmm.h>
class ExampleWindow : public Gtk::Window
{
public:
ExampleWindow();
~ExampleWindow() override;
protected:
//Signal handlers:
void on_button_info_clicked();
void on_button_question_clicked();
void on_question_dialog_finish(const Glib::RefPtr<Gio::AsyncResult>& result);
//Child widgets:
Gtk::Box m_ButtonBox;
Gtk::Button m_Button_Info;
Gtk::Button m_Button_Question;
Glib::RefPtr<Gtk::AlertDialog> m_pDialog;
};
#endif //GTKMM_EXAMPLEWINDOW_H
</code></pre>
<p>File: <code class="filename">examplewindow.cc</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "examplewindow.h"
#include <gtkmm/messagedialog.h>
#include <iostream>
ExampleWindow::ExampleWindow()
: m_ButtonBox(Gtk::Orientation::VERTICAL),
m_Button_Info("Show Info AlertDialog"),
m_Button_Question("Show Question AlertDialog")
{
set_title("Gtk::AlertDialog example");
set_child(m_ButtonBox);
m_ButtonBox.append(m_Button_Info);
m_Button_Info.set_expand(true);
m_Button_Info.signal_clicked().connect(sigc::mem_fun(*this,
&ExampleWindow::on_button_info_clicked) );
m_ButtonBox.append(m_Button_Question);
m_Button_Question.set_expand(true);
m_Button_Question.signal_clicked().connect(sigc::mem_fun(*this,
&ExampleWindow::on_button_question_clicked) );
}
ExampleWindow::~ExampleWindow()
{
}
void ExampleWindow::on_button_info_clicked()
{
if (!m_pDialog)
m_pDialog = Gtk::AlertDialog::create();
else
{
// Reset values that may have been set by on_button_question_clicked().
m_pDialog->set_buttons({});
m_pDialog->set_default_button(-1);
m_pDialog->set_cancel_button(-1);
}
m_pDialog->set_message("This is an INFO AlertDialog.");
m_pDialog->set_detail("And this is the secondary text that explains things.");
m_pDialog->show(*this);
}
void ExampleWindow::on_button_question_clicked()
{
if (!m_pDialog)
m_pDialog = Gtk::AlertDialog::create();
m_pDialog->set_message("This is a QUESTION AlertDialog.");
m_pDialog->set_detail("And this is the secondary text that explains things.");
m_pDialog->set_buttons({"Cancel", "Retry", "OK"});
m_pDialog->set_default_button(2); // OK button or Return key
m_pDialog->set_cancel_button(0); // Cancel button or Escape key
m_pDialog->choose(*this,
sigc::mem_fun(*this, &ExampleWindow::on_question_dialog_finish));
}
void ExampleWindow::on_question_dialog_finish(const Glib::RefPtr<Gio::AsyncResult>& result)
{
try
{
const int response_id = m_pDialog->choose_finish(result);
switch (response_id)
{
case 0:
std::cout << "Cancel clicked." << std::endl;
break;
case 1:
std::cout << "Retry clicked." << std::endl;
break;
case 2:
std::cout << "OK clicked." << std::endl;
break;
default:
std::cout << "Unexpected response: " << response_id << std::endl;
break;
}
}
catch (const Gtk::DialogError& err)
{
// Can be thrown by m_pDialog->choose_finish(result).
std::cout << "DialogError, " << err.what() << std::endl;
}
catch (const Glib::Error& err)
{
std::cout << "Unexpected exception. " << err.what() << std::endl;
}
}
</code></pre>
<p>File: <code class="filename">main.cc</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "examplewindow.h"
#include <gtkmm/application.h>
int main(int argc, char *argv[])
{
auto app = Gtk::Application::create("org.gtkmm.example");
//Shows the window and returns when it is closed.
return app->make_window_and_run<ExampleWindow>(argc, argv);
}
</code></pre>
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