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<tr><th colspan="3" align="center">Non-modal AboutDialog</th></tr>
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<td width="20%" align="left">
<a accesskey="p" href="sec-dialogs-fontdialog.html"><img src="icons/prev.png" alt="Prev"></a> </td>
<th width="60%" align="center">Chapter 17. Dialogs</th>
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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-about-dialog"></a>Non-modal AboutDialog</h2></div></div></div>
<p>
The <code class="classname">AboutDialog</code> offers a simple way to display information
about a program, like its logo, name, copyright, website and license.
</p>
<p>
Most dialogs in this chapter are modal, that is, they freeze the rest of
the application while they are shown. It's also possible to create a non-modal
dialog, which does not freeze other windows in the application.
The following example shows a non-modal <code class="classname">AboutDialog</code>. This is
perhaps not the kind of dialog you would normally make non-modal, but non-modal
dialogs can be useful in other cases. E.g. <span class="application">gedit</span>'s
search-and-replace dialog is non-modal.
</p>
<p><a class="ulink" href="https://gnome.pages.gitlab.gnome.org/gtkmm/classGtk_1_1AboutDialog.html" target="_top">Reference</a></p>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="aboutdialog-example"></a>Example</h3></div></div></div>
<div class="figure">
<a name="figure-dialogs-about"></a><p class="title"><b>Figure 17.5. AboutDialog</b></p>
<div class="figure-contents">
<div class="screenshot">
<div class="mediaobject"><img src="figures/dialogs_about.png" alt="AboutDialog"></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/aboutdialog" 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();
virtual ~ExampleWindow();
protected:
//Signal handlers:
void on_button_clicked();
//Child widgets:
Gtk::Box m_VBox;
Gtk::Label m_Label;
Gtk::Box m_ButtonBox;
Gtk::Button m_Button;
Gtk::AboutDialog m_Dialog;
};
#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 <iostream>
ExampleWindow::ExampleWindow()
: m_VBox(Gtk::Orientation::VERTICAL),
m_Label("The AboutDialog is non-modal. "
"You can select parts of this text while the AboutDialog is shown."),
m_ButtonBox(Gtk::Orientation::VERTICAL),
m_Button("Show AboutDialog")
{
set_title("Gtk::AboutDialog example");
set_default_size(400, 150);
set_child(m_VBox);
m_VBox.append(m_Label);
m_Label.set_expand(true);
m_Label.set_wrap(true);
m_Label.set_selectable(true);
m_VBox.append(m_ButtonBox);
m_ButtonBox.append(m_Button);
m_Button.set_expand(true);
m_Button.set_halign(Gtk::Align::CENTER);
m_Button.set_valign(Gtk::Align::CENTER);
m_Button.signal_clicked().connect(sigc::mem_fun(*this,
&ExampleWindow::on_button_clicked) );
m_Dialog.set_transient_for(*this);
m_Dialog.set_hide_on_close();
m_Dialog.set_logo(Gdk::Texture::create_from_resource("/about/gtkmm_logo.gif"));
m_Dialog.set_program_name("Example application");
m_Dialog.set_version("1.0.0");
m_Dialog.set_copyright("Murray Cumming");
m_Dialog.set_comments("This is just an example application.");
m_Dialog.set_license("LGPL");
m_Dialog.set_website("http://www.gtkmm.org");
m_Dialog.set_website_label("gtkmm website");
std::vector<Glib::ustring> list_authors;
list_authors.push_back("Murray Cumming");
list_authors.push_back("Somebody Else");
list_authors.push_back("AN Other");
m_Dialog.set_authors(list_authors);
m_Button.grab_focus();
}
ExampleWindow::~ExampleWindow()
{
}
void ExampleWindow::on_button_clicked()
{
m_Dialog.set_visible(true);
//Bring it to the front, in case it was already shown:
m_Dialog.present();
}
</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>
<p>File: <code class="filename">aboutdialog.gresource.xml</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code"><?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/about">
<file>gtkmm_logo.gif</file>
</gresource>
</gresources>
</code></pre>
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