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<html>
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</script><title>Header bar</title>
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<div class="navheader">
<table width="100%" summary="Navigation header">
<tr><th colspan="3" align="center">Header bar</th></tr>
<tr>
<td width="20%" align="left">
<a accesskey="p" href="sec-buildapp-properties.html"><img src="icons/prev.png" alt="Prev"></a> </td>
<th width="60%" align="center">Chapter 31. Building applications</th>
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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="sec-buildapp-header-bar"></a>Header bar</h2></div></div></div>
<p>
Our application already uses a <code class="classname">Gtk::HeaderBar</code> instead of
a 'normal' window titlebar. The header bar is a direct child of the window,
and its type is <code class="literal">titlebar</code>. This is set in the
<code class="filename">window.ui</code> file.
</p>
<p>
Here we'll just make two small changes to the header bar. The <code class="literal">decoration-layout</code>
property is set in the <code class="filename">window.ui</code> file, to show only the close
button, and hide the minimize and maximize buttons. We also include an icon in the
resource file, and set up this icon as the window icon.
In <code class="classname">ExampleAppWindow</code>'s constructor:
</p>
<pre class="programlisting"><code class="code">Gtk::IconTheme::get_for_display(get_display())->add_resource_path("/org/gtkmm/exampleapp");
set_icon_name("exampleapp");
</code></pre>
<p>
Here is how the application now looks:
</p>
<div class="figure">
<a name="figure-buildapp-header-bar"></a><p class="title"><b>Figure 31.9. Header bar</b></p>
<div class="figure-contents">
<div class="screenshot">
<div class="mediaobject"><img src="figures/buildapp_header_bar.png" alt="Header bar"></div>
</div>
</div>
</div>
<br class="figure-break">
<p>
The <code class="filename">window.ui</code> file sets a header bar title, but this title is not shown.
That's because the stack switcher is a child of type <code class="literal">title</code>. The stack
switcher becomes a custom title that hides the title label.
</p>
<p><a class="ulink" href="https://gitlab.gnome.org/GNOME/gtkmm-documentation/tree/master/examples/book/buildapp/step9" target="_top">Source Code</a></p>
<p>File: <code class="filename">exampleapplication.h</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "../step4/exampleapplication.h"
// Equal to the corresponding file in step4
</code></pre>
<p>File: <code class="filename">exampleappprefs.h</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "../step5/exampleappprefs.h"
// Equal to the corresponding file in step5
</code></pre>
<p>File: <code class="filename">exampleappwindow.h</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "../step8/exampleappwindow.h"
// Equal to the corresponding file in step8
</code></pre>
<p>File: <code class="filename">exampleapplication.cc</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "../step5/exampleapplication.cc"
// Equal to the corresponding file in step5
</code></pre>
<p>File: <code class="filename">exampleappprefs.cc</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "../step5/exampleappprefs.cc"
// Equal to the corresponding file in step5
</code></pre>
<p>File: <code class="filename">exampleappwindow.cc</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "exampleappwindow.h"
#include <iostream>
#include <stdexcept>
#include <set>
ExampleAppWindow::ExampleAppWindow(BaseObjectType* cobject,
const Glib::RefPtr<Gtk::Builder>& refBuilder)
: Gtk::ApplicationWindow(cobject),
m_refBuilder(refBuilder)
{
// Get widgets from the Gtk::Builder file.
m_stack = m_refBuilder->get_widget<Gtk::Stack>("stack");
if (!m_stack)
throw std::runtime_error("No \"stack\" object in window.ui");
m_search = m_refBuilder->get_widget<Gtk::ToggleButton>("search");
if (!m_search)
throw std::runtime_error("No \"search\" object in window.ui");
m_searchbar = m_refBuilder->get_widget<Gtk::SearchBar>("searchbar");
if (!m_searchbar)
throw std::runtime_error("No \"searchbar\" object in window.ui");
#if HAS_SEARCH_ENTRY2
m_searchentry = m_refBuilder->get_widget<Gtk::SearchEntry2>("searchentry");
#else
m_searchentry = m_refBuilder->get_widget<Gtk::SearchEntry>("searchentry");
#endif
if (!m_searchentry)
throw std::runtime_error("No \"searchentry\" object in window.ui");
m_gears = m_refBuilder->get_widget<Gtk::MenuButton>("gears");
if (!m_gears)
throw std::runtime_error("No \"gears\" object in window.ui");
m_sidebar = m_refBuilder->get_widget<Gtk::Revealer>("sidebar");
if (!m_sidebar)
throw std::runtime_error("No \"sidebar\" object in window.ui");
m_words = m_refBuilder->get_widget<Gtk::ListBox>("words");
if (!m_words)
throw std::runtime_error("No \"words\" object in window.ui");
m_lines = m_refBuilder->get_widget<Gtk::Label>("lines");
if (!m_lines)
throw std::runtime_error("No \"lines\" object in window.ui");
m_lines_label = m_refBuilder->get_widget<Gtk::Label>("lines_label");
if (!m_lines_label)
throw std::runtime_error("No \"lines_label\" object in window.ui");
// Bind settings.
m_settings = Gio::Settings::create("org.gtkmm.exampleapp");
m_settings->bind("transition", m_stack->property_transition_type());
m_settings->bind("show-words", m_sidebar->property_reveal_child());
// Bind properties of the search button to the search bar.
m_binding_search_enabled = Glib::Binding::bind_property(m_search->property_active(),
m_searchbar->property_search_mode_enabled(), Glib::Binding::Flags::BIDIRECTIONAL);
// Connect signal handlers.
m_searchentry->signal_search_changed().connect(
sigc::mem_fun(*this, &ExampleAppWindow::on_search_text_changed));
m_stack->property_visible_child().signal_changed().connect(
sigc::mem_fun(*this, &ExampleAppWindow::on_visible_child_changed));
m_sidebar->property_reveal_child().signal_changed().connect(
sigc::mem_fun(*this, &ExampleAppWindow::on_reveal_child_changed));
// Connect the menu to the MenuButton m_gears, and bind the show-words setting
// to the win.show-words action and the "Words" menu item.
// (The connection between action and menu item is specified in gears_menu.ui.)
auto menu_builder = Gtk::Builder::create_from_resource("/org/gtkmm/exampleapp/gears_menu.ui");
auto menu = menu_builder->get_object<Gio::MenuModel>("menu");
if (!menu)
throw std::runtime_error("No \"menu\" object in gears_menu.ui");
m_gears->set_menu_model(menu);
add_action(m_settings->create_action("show-words"));
// Bind the "visible" property of m_lines to the win.show-lines action, to
// the "Lines" menu item and to the "visible" property of m_lines_label.
add_action(Gio::PropertyAction::create("show-lines", m_lines->property_visible()));
m_binding_lines_visible = Glib::Binding::bind_property(m_lines->property_visible(),
m_lines_label->property_visible());
// Set the window icon.
Gtk::IconTheme::get_for_display(get_display())->add_resource_path("/org/gtkmm/exampleapp");
set_icon_name("exampleapp");
}
//static
ExampleAppWindow* ExampleAppWindow::create()
{
// Load the Builder file and instantiate its widgets.
auto refBuilder = Gtk::Builder::create_from_resource("/org/gtkmm/exampleapp/window.ui");
auto window = Gtk::Builder::get_widget_derived<ExampleAppWindow>(refBuilder, "app_window");
if (!window)
throw std::runtime_error("No \"app_window\" object in window.ui");
return window;
}
void ExampleAppWindow::open_file_view(const Glib::RefPtr<Gio::File>& file)
{
const Glib::ustring basename = file->get_basename();
auto scrolled = Gtk::make_managed<Gtk::ScrolledWindow>();
scrolled->set_expand(true);
auto view = Gtk::make_managed<Gtk::TextView>();
view->set_editable(false);
view->set_cursor_visible(false);
scrolled->set_child(*view);
m_stack->add(*scrolled, basename, basename);
auto buffer = view->get_buffer();
try
{
char* contents = nullptr;
gsize length = 0;
file->load_contents(contents, length);
buffer->set_text(contents, contents+length);
g_free(contents);
}
catch (const Glib::Error& ex)
{
std::cout << "ExampleAppWindow::open_file_view(\"" << file->get_parse_name()
<< "\"):\n " << ex.what() << std::endl;
return;
}
auto tag = buffer->create_tag();
m_settings->bind("font", tag->property_font());
buffer->apply_tag(tag, buffer->begin(), buffer->end());
m_search->set_sensitive(true);
update_words();
update_lines();
}
void ExampleAppWindow::on_search_text_changed()
{
const auto text = m_searchentry->get_text();
if (text.empty())
return;
auto tab = dynamic_cast<Gtk::ScrolledWindow*>(m_stack->get_visible_child());
if (!tab)
{
std::cout << "ExampleAppWindow::on_search_text_changed(): No visible child." << std::endl;
return;
}
auto view = dynamic_cast<Gtk::TextView*>(tab->get_child());
if (!view)
{
std::cout << "ExampleAppWindow::on_search_text_changed(): No visible text view." << std::endl;
return;
}
// Very simple-minded search implementation.
auto buffer = view->get_buffer();
Gtk::TextIter match_start;
Gtk::TextIter match_end;
if (buffer->begin().forward_search(text, Gtk::TextSearchFlags::CASE_INSENSITIVE,
match_start, match_end))
{
buffer->select_range(match_start, match_end);
view->scroll_to(match_start);
}
}
void ExampleAppWindow::on_visible_child_changed()
{
m_searchbar->set_search_mode(false);
update_words();
update_lines();
}
void ExampleAppWindow::on_find_word(const Gtk::Button* button)
{
m_searchentry->set_text(button->get_label());
}
void ExampleAppWindow::on_reveal_child_changed()
{
update_words();
}
void ExampleAppWindow::update_words()
{
auto tab = dynamic_cast<Gtk::ScrolledWindow*>(m_stack->get_visible_child());
if (!tab)
return;
auto view = dynamic_cast<Gtk::TextView*>(tab->get_child());
if (!view)
{
std::cout << "ExampleAppWindow::update_words(): No visible text view." << std::endl;
return;
}
auto buffer = view->get_buffer();
// Find all words in the text buffer.
std::set<Glib::ustring> words;
auto start = buffer->begin();
Gtk::TextIter end;
while (start)
{
while (start && !start.starts_word())
++start;
if (!start)
break;
end = start;
end.forward_word_end();
if (start == end)
break;
auto word = buffer->get_text(start, end, false);
words.insert(word.lowercase());
start = end;
}
// Remove old children from the ListBox.
while (auto child = m_words->get_first_child())
m_words->remove(*child);
// Add new child buttons, one per unique word.
for (const auto& word : words)
{
auto row = Gtk::make_managed<Gtk::Button>(word);
row->signal_clicked().connect(sigc::bind(sigc::mem_fun(*this,
&ExampleAppWindow::on_find_word), row));
m_words->append(*row);
}
}
void ExampleAppWindow::update_lines()
{
auto tab = dynamic_cast<Gtk::ScrolledWindow*>(m_stack->get_visible_child());
if (!tab)
return;
auto view = dynamic_cast<Gtk::TextView*>(tab->get_child());
if (!view)
{
std::cout << "ExampleAppWindow::update_lines(): No visible text view." << std::endl;
return;
}
auto buffer = view->get_buffer();
int count = 0;
auto iter = buffer->begin();
while (iter)
{
++count;
if (!iter.forward_line())
break;
}
m_lines->set_text(Glib::ustring::format(count));
}
</code></pre>
<p>File: <code class="filename">main.cc</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code">#include "../step6/main.cc"
// Equal to the corresponding file in step6
</code></pre>
<p>File: <code class="filename">exampleapp.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="/org/gtkmm/exampleapp">
<file preprocess="xml-stripblanks">window.ui</file>
<file preprocess="xml-stripblanks">gears_menu.ui</file>
<file preprocess="xml-stripblanks">prefs.ui</file>
<file>exampleapp.png</file>
</gresource>
</gresources>
</code></pre>
<p>File: <code class="filename">window.ui</code> (For use with gtkmm 4)</p>
<pre class="programlisting"><code class="code"><?xml version="1.0" encoding="UTF-8"?>
<interface>
<object class="GtkApplicationWindow" id="app_window">
<property name="title" translatable="yes">Example Application</property>
<property name="default-width">600</property>
<property name="default-height">400</property>
<property name="hide-on-close">True</property>
<child type="titlebar">
<object class="GtkHeaderBar" id="header">
<property name="decoration-layout">icon:close</property>
<child>
<object class="GtkLabel" id="lines_label">
<property name="visible">False</property>
<property name="label" translatable="yes">Lines:</property>
</object>
</child>
<child>
<object class="GtkLabel" id="lines">
<property name="visible">False</property>
</object>
</child>
<child type="title">
<object class="GtkStackSwitcher" id="tabs">
<property name="stack">stack</property>
</object>
</child>
<child type="end">
<object class="GtkToggleButton" id="search">
<property name="sensitive">False</property>
<property name="icon-name">edit-find-symbolic</property>
</object>
</child>
<child type="end">
<object class="GtkMenuButton" id="gears">
<property name="direction">none</property>
</object>
</child>
</object>
</child>
<child>
<object class="GtkBox" id="content_box">
<property name="orientation">vertical</property>
<child>
<object class="GtkSearchBar" id="searchbar">
<child>
<object class="GtkSearchEntry" id="searchentry">
</object>
</child>
</object>
</child>
<child>
<object class="GtkBox" id="hbox">
<child>
<object class="GtkRevealer" id="sidebar">
<property name="transition-type">slide-right</property>
<child>
<object class="GtkScrolledWindow" id="sidebar-sw">
<property name="hscrollbar-policy">never</property>
<child>
<object class="GtkListBox" id="words">
<property name="selection-mode">none</property>
</object>
</child>
</object>
</child>
</object>
</child>
<child>
<object class="GtkStack" id="stack">
<property name="transition-duration">500</property>
</object>
</child>
</object>
</child>
</object>
</child>
</object>
</interface>
</code></pre>
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