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<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="http://developer.gnome.org/gtkmm/3.24/classGtk_1_1AboutDialog.html" target="_top">Reference</a></p>
<div class="sect2">
<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 16.5. AboutDialog</b></p>
<div class="figure-contents"><div class="screenshot"><div><img src="figures/dialogs_about.png" alt="AboutDialog"></div></div></div>
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<br class="figure-break"><p><a class="ulink" href="http://git.gnome.org/browse/gtkmm-documentation/tree/examples/book/dialogs/aboutdialog?h=gtkmm-3-24" 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 <gtkmm.h>
class ExampleWindow : public Gtk::Window
{
public:
ExampleWindow();
virtual ~ExampleWindow();
protected:
//Signal handlers:
void on_button_clicked();
void on_about_dialog_response(int response_id);
//Child widgets:
Gtk::Box m_VBox;
Gtk::Label m_Label;
Gtk::ButtonBox m_ButtonBox;
Gtk::Button m_Button;
Gtk::AboutDialog m_Dialog;
};
#endif //GTKMM_EXAMPLEWINDOW_H
</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 <gtkmm/application.h>
int main(int argc, char *argv[])
{
auto app = Gtk::Application::create(argc, argv, "org.gtkmm.example");
ExampleWindow window;
//Shows the window and returns when it is closed.
return app->run(window);
}
</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 <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");
add(m_VBox);
m_VBox.pack_start(m_Label);
m_Label.set_line_wrap(true);
m_Label.set_selectable(true);
m_VBox.pack_start(m_ButtonBox);
m_ButtonBox.pack_start(m_Button);
m_Button.signal_clicked().connect(sigc::mem_fun(*this,
&ExampleWindow::on_button_clicked) );
m_Dialog.set_transient_for(*this);
m_Dialog.set_logo(Gdk::Pixbuf::create_from_resource("/about/gtkmm_logo.gif", -1, 40, true));
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_Dialog.signal_response().connect(
sigc::mem_fun(*this, &ExampleWindow::on_about_dialog_response) );
show_all_children();
// The widget must be realized and mapped before grab_focus() is called.
// That's why it's called after show_all_children().
m_Button.grab_focus();
}
ExampleWindow::~ExampleWindow()
{
}
void ExampleWindow::on_about_dialog_response(int response_id)
{
std::cout << response_id
<< ", close=" << Gtk::RESPONSE_CLOSE
<< ", cancel=" << Gtk::RESPONSE_CANCEL
<< ", delete_event=" << Gtk::RESPONSE_DELETE_EVENT
<< std::endl;
switch (response_id)
{
case Gtk::RESPONSE_CLOSE:
case Gtk::RESPONSE_CANCEL:
case Gtk::RESPONSE_DELETE_EVENT:
m_Dialog.hide();
break;
default:
std::cout << "Unexpected response!" << std::endl;
break;
}
}
void ExampleWindow::on_button_clicked()
{
m_Dialog.show();
//Bring it to the front, in case it was already shown:
m_Dialog.present();
}
</pre>
<p>File: <code class="filename">aboutdialog.gresource.xml</code> (For use with gtkmm 3, not gtkmm 2)
</p>
<pre class="programlisting">
<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/about">
<file>gtkmm_logo.gif</file>
</gresource>
</gresources>
</pre>
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