GTK4 Building applications

exampleapp.c

#include <gtk/gtk.h>

#include "exampleapp.h"
#include "exampleappwin.h"
#include "exampleappprefs.h"

struct _ExampleApp
{
  GtkApplication parent;
};

G_DEFINE_TYPE(ExampleApp, example_app, GTK_TYPE_APPLICATION);

static void
example_app_init (ExampleApp *app)
{
}

static void
preferences_activated (GSimpleAction *action,
                       GVariant      *parameter,
                       gpointer       app)
{
  ExampleAppPrefs *prefs;
  GtkWindow *win;

  win = gtk_application_get_active_window (GTK_APPLICATION (app));
  prefs = example_app_prefs_new (EXAMPLE_APP_WINDOW (win));
  gtk_window_present (GTK_WINDOW (prefs));
}

static void
quit_activated (GSimpleAction *action,
                GVariant      *parameter,
                gpointer       app)
{
  g_application_quit (G_APPLICATION (app));
}

static GActionEntry app_entries[] =
{
  { "preferences", preferences_activated, NULL, NULL, NULL },
  { "quit", quit_activated, NULL, NULL, NULL }
};

static void
example_app_startup (GApplication *app)
{
  const char *quit_accels[2] = { "<Ctrl>Q", NULL };

  G_APPLICATION_CLASS (example_app_parent_class)->startup (app);

  g_action_map_add_action_entries (G_ACTION_MAP (app),
                                   app_entries, G_N_ELEMENTS (app_entries),
                                   app);
  gtk_application_set_accels_for_action (GTK_APPLICATION (app),
                                         "app.quit",
                                         quit_accels);
}

static void
example_app_activate (GApplication *app)
{
  ExampleAppWindow *win;

  win = example_app_window_new (EXAMPLE_APP (app));
  gtk_window_present (GTK_WINDOW (win));
}

static void
example_app_open (GApplication  *app,
                  GFile        **files,
                  int            n_files,
                  const char    *hint)
{
  GList *windows;
  ExampleAppWindow *win;
  int i;

  windows = gtk_application_get_windows (GTK_APPLICATION (app));
  if (windows)
    win = EXAMPLE_APP_WINDOW (windows->data);
  else
    win = example_app_window_new (EXAMPLE_APP (app));

  for (i = 0; i < n_files; i++)
    example_app_window_open (win, files[i]);

  gtk_window_present (GTK_WINDOW (win));
}

static void
example_app_class_init (ExampleAppClass *class)
{
  G_APPLICATION_CLASS (class)->startup = example_app_startup;
  G_APPLICATION_CLASS (class)->activate = example_app_activate;
  G_APPLICATION_CLASS (class)->open = example_app_open;
}

ExampleApp *
example_app_new (void)
{
  return g_object_new (EXAMPLE_APP_TYPE,
                       "application-id", "org.gtk.exampleapp",
                       "flags", G_APPLICATION_HANDLES_OPEN,
                       NULL);
}

exampleapp.gresource.xml

<?xml version="1.0" encoding="UTF-8"?>
<gresources>
  <gresource prefix="/org/gtk/exampleapp">
    <file preprocess="xml-stripblanks">window.ui</file>
    <file preprocess="xml-stripblanks">gears-menu.ui</file>
    <file preprocess="xml-stripblanks">prefs.ui</file>
  </gresource>
</gresources>

exampleapp.h

#ifndef __EXAMPLEAPP_H
#define __EXAMPLEAPP_H

#include <gtk/gtk.h>


#define EXAMPLE_APP_TYPE (example_app_get_type ())
G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)


ExampleApp     *example_app_new         (void);


#endif /* __EXAMPLEAPP_H */

exampleappprefs.c

#include <gtk/gtk.h>

#include "exampleapp.h"
#include "exampleappwin.h"
#include "exampleappprefs.h"

struct _ExampleAppPrefs
{
  GtkDialog parent;

  GSettings *settings;
  GtkWidget *font;
  GtkWidget *transition;
};

G_DEFINE_TYPE (ExampleAppPrefs, example_app_prefs, GTK_TYPE_DIALOG)

static void
example_app_prefs_init (ExampleAppPrefs *prefs)
{
  gtk_widget_init_template (GTK_WIDGET (prefs));
  prefs->settings = g_settings_new ("org.gtk.exampleapp");

  g_settings_bind (prefs->settings, "font",
                   prefs->font, "font",
                   G_SETTINGS_BIND_DEFAULT);
  g_settings_bind (prefs->settings, "transition",
                   prefs->transition, "active-id",
                   G_SETTINGS_BIND_DEFAULT);
}

static void
example_app_prefs_dispose (GObject *object)
{
  ExampleAppPrefs *prefs;

  prefs = EXAMPLE_APP_PREFS (object);

  g_clear_object (&prefs->settings);

  G_OBJECT_CLASS (example_app_prefs_parent_class)->dispose (object);
}

static void
example_app_prefs_class_init (ExampleAppPrefsClass *class)
{
  G_OBJECT_CLASS (class)->dispose = example_app_prefs_dispose;

  gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (class),
                                               "/org/gtk/exampleapp/prefs.ui");
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppPrefs, font);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppPrefs, transition);
}

ExampleAppPrefs *
example_app_prefs_new (ExampleAppWindow *win)
{
  return g_object_new (EXAMPLE_APP_PREFS_TYPE, "transient-for", win, "use-header-bar", TRUE, NULL);
}

exampleappprefs.h

#ifndef __EXAMPLEAPPPREFS_H
#define __EXAMPLEAPPPREFS_H

#include <gtk/gtk.h>
#include "exampleappwin.h"


#define EXAMPLE_APP_PREFS_TYPE (example_app_prefs_get_type ())
G_DECLARE_FINAL_TYPE (ExampleAppPrefs, example_app_prefs, EXAMPLE, APP_PREFS, GtkDialog)


ExampleAppPrefs        *example_app_prefs_new          (ExampleAppWindow *win);


#endif /* __EXAMPLEAPPPREFS_H */

exampleappwin.c

#include <gtk/gtk.h>

#include "exampleapp.h"
#include "exampleappwin.h"

struct _ExampleAppWindow
{
  GtkApplicationWindow parent;

  GSettings *settings;
  GtkWidget *stack;
  GtkWidget *gears;
  GtkWidget *search;
  GtkWidget *searchbar;
  GtkWidget *searchentry;
  GtkWidget *sidebar;
  GtkWidget *words;
  GtkWidget *lines;
  GtkWidget *lines_label;
};

G_DEFINE_TYPE (ExampleAppWindow, example_app_window, GTK_TYPE_APPLICATION_WINDOW)

static void
search_text_changed (GtkEntry         *entry,
                     ExampleAppWindow *win)
{
  const char *text;
  GtkWidget *tab;
  GtkWidget *view;
  GtkTextBuffer *buffer;
  GtkTextIter start, match_start, match_end;

  text = gtk_editable_get_text (GTK_EDITABLE (entry));

  if (text[0] == '\0')
    return;

  tab = gtk_stack_get_visible_child (GTK_STACK (win->stack));
  view = gtk_scrolled_window_get_child (GTK_SCROLLED_WINDOW (tab));
  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));

  /* Very simple-minded search implementation */
  gtk_text_buffer_get_start_iter (buffer, &start);
  if (gtk_text_iter_forward_search (&start, text, GTK_TEXT_SEARCH_CASE_INSENSITIVE,
                                    &match_start, &match_end, NULL))
    {
      gtk_text_buffer_select_range (buffer, &match_start, &match_end);
      gtk_text_view_scroll_to_iter (GTK_TEXT_VIEW (view), &match_start,
                                    0.0, FALSE, 0.0, 0.0);
    }
}

static void
find_word (GtkButton        *button,
           ExampleAppWindow *win)
{
  const char *word;

  word = gtk_button_get_label (button);
  gtk_editable_set_text (GTK_EDITABLE (win->searchentry), word);
}

static void
update_words (ExampleAppWindow *win)
{
  GHashTable *strings;
  GHashTableIter iter;
  GtkWidget *tab, *view, *row;
  GtkTextBuffer *buffer;
  GtkTextIter start, end;
  char *word, *key;
  GtkWidget *child;

  tab = gtk_stack_get_visible_child (GTK_STACK (win->stack));

  if (tab == NULL)
    return;

  view = gtk_scrolled_window_get_child (GTK_SCROLLED_WINDOW (tab));
  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));

  strings = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);

  gtk_text_buffer_get_start_iter (buffer, &start);
  while (!gtk_text_iter_is_end (&start))
    {
      while (!gtk_text_iter_starts_word (&start))
        {
          if (!gtk_text_iter_forward_char (&start))
            goto done;
        }
      end = start;
      if (!gtk_text_iter_forward_word_end (&end))
        goto done;
      word = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
      g_hash_table_add (strings, g_utf8_strdown (word, -1));
      g_free (word);
      start = end;
    }

done:
  while ((child = gtk_widget_get_first_child (win->words)))
    gtk_list_box_remove (GTK_LIST_BOX (win->words), child);

  g_hash_table_iter_init (&iter, strings);
  while (g_hash_table_iter_next (&iter, (gpointer *)&key, NULL))
    {
      row = gtk_button_new_with_label (key);
      g_signal_connect (row, "clicked",
                        G_CALLBACK (find_word), win);
      gtk_list_box_insert (GTK_LIST_BOX (win->words), row, -1);
    }

  g_hash_table_unref (strings);
}

static void
update_lines (ExampleAppWindow *win)
{
  GtkWidget *tab, *view;
  GtkTextBuffer *buffer;
  int count;
  char *lines;

  tab = gtk_stack_get_visible_child (GTK_STACK (win->stack));

  if (tab == NULL)
    return;

  view = gtk_scrolled_window_get_child (GTK_SCROLLED_WINDOW (tab));
  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));

  count = gtk_text_buffer_get_line_count (buffer);
  lines = g_strdup_printf ("%d", count);
  gtk_label_set_text (GTK_LABEL (win->lines), lines);
  g_free (lines);
}

static void
visible_child_changed (GObject          *stack,
                       GParamSpec       *pspec,
                       ExampleAppWindow *win)
{
  if (gtk_widget_in_destruction (GTK_WIDGET (stack)))
    return;

  gtk_search_bar_set_search_mode (GTK_SEARCH_BAR (win->searchbar), FALSE);
  update_words (win);
  update_lines (win);
}

static void
words_changed (GObject          *sidebar,
               GParamSpec       *pspec,
               ExampleAppWindow *win)
{
  update_words (win);
}

static void
example_app_window_init (ExampleAppWindow *win)
{
  GtkBuilder *builder;
  GMenuModel *menu;
  GAction *action;

  gtk_widget_init_template (GTK_WIDGET (win));

  builder = gtk_builder_new_from_resource ("/org/gtk/exampleapp/gears-menu.ui");
  menu = G_MENU_MODEL (gtk_builder_get_object (builder, "menu"));
  gtk_menu_button_set_menu_model (GTK_MENU_BUTTON (win->gears), menu);
  g_object_unref (builder);

  win->settings = g_settings_new ("org.gtk.exampleapp");

  g_settings_bind (win->settings, "transition",
                   win->stack, "transition-type",
                   G_SETTINGS_BIND_DEFAULT);

  g_settings_bind (win->settings, "show-words",
                   win->sidebar, "reveal-child",
                   G_SETTINGS_BIND_DEFAULT);

  g_object_bind_property (win->search, "active",
                          win->searchbar, "search-mode-enabled",
                          G_BINDING_BIDIRECTIONAL);

  g_signal_connect (win->sidebar, "notify::reveal-child",
                    G_CALLBACK (words_changed), win);

  action = g_settings_create_action (win->settings, "show-words");
  g_action_map_add_action (G_ACTION_MAP (win), action);
  g_object_unref (action);

  action = (GAction*) g_property_action_new ("show-lines", win->lines, "visible");
  g_action_map_add_action (G_ACTION_MAP (win), action);
  g_object_unref (action);

  g_object_bind_property (win->lines, "visible",
                          win->lines_label, "visible",
                          G_BINDING_DEFAULT);
}

static void
example_app_window_dispose (GObject *object)
{
  ExampleAppWindow *win;

  win = EXAMPLE_APP_WINDOW (object);

  g_clear_object (&win->settings);

  G_OBJECT_CLASS (example_app_window_parent_class)->dispose (object);
}

static void
example_app_window_class_init (ExampleAppWindowClass *class)
{
  G_OBJECT_CLASS (class)->dispose = example_app_window_dispose;

  gtk_widget_class_set_template_from_resource (GTK_WIDGET_CLASS (class),
                                               "/org/gtk/exampleapp/window.ui");

  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, stack);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, gears);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, search);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, searchbar);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, searchentry);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, words);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, sidebar);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, lines);
  gtk_widget_class_bind_template_child (GTK_WIDGET_CLASS (class), ExampleAppWindow, lines_label);

  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), search_text_changed);
  gtk_widget_class_bind_template_callback (GTK_WIDGET_CLASS (class), visible_child_changed);
}

ExampleAppWindow *
example_app_window_new (ExampleApp *app)
{
  return g_object_new (EXAMPLE_APP_WINDOW_TYPE, "application", app, NULL);
}

void
example_app_window_open (ExampleAppWindow *win,
                         GFile            *file)
{
  char *basename;
  GtkWidget *scrolled, *view;
  char *contents;
  gsize length;
  GtkTextBuffer *buffer;
  GtkTextTag *tag;
  GtkTextIter start_iter, end_iter;

  basename = g_file_get_basename (file);

  scrolled = gtk_scrolled_window_new ();
  gtk_widget_set_hexpand (scrolled, TRUE);
  gtk_widget_set_vexpand (scrolled, TRUE);
  view = gtk_text_view_new ();
  gtk_text_view_set_editable (GTK_TEXT_VIEW (view), FALSE);
  gtk_text_view_set_cursor_visible (GTK_TEXT_VIEW (view), FALSE);
  gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (scrolled), view);
  gtk_stack_add_titled (GTK_STACK (win->stack), scrolled, basename, basename);

  buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));

  if (g_file_load_contents (file, NULL, &contents, &length, NULL, NULL))
    {
      gtk_text_buffer_set_text (buffer, contents, length);
      g_free (contents);
    }

  tag = gtk_text_buffer_create_tag (buffer, NULL, NULL);
  g_settings_bind (win->settings, "font",
                   tag, "font",
                   G_SETTINGS_BIND_DEFAULT);

  gtk_text_buffer_get_start_iter (buffer, &start_iter);
  gtk_text_buffer_get_end_iter (buffer, &end_iter);
  gtk_text_buffer_apply_tag (buffer, tag, &start_iter, &end_iter);

  g_free (basename);

  gtk_widget_set_sensitive (win->search, TRUE);

  update_words (win);
  update_lines (win);
}

exampleappwin.h

#ifndef __EXAMPLEAPPWIN_H
#define __EXAMPLEAPPWIN_H

#include <gtk/gtk.h>
#include "exampleapp.h"


#define EXAMPLE_APP_WINDOW_TYPE (example_app_window_get_type ())
G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW, GtkApplicationWindow)


ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
void                    example_app_window_open         (ExampleAppWindow *win,
                                                         GFile            *file);


#endif /* __EXAMPLEAPPWIN_H */

gears-menu.ui

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <menu id="menu">
    <section>
      <item>
        <attribute name="label" translatable="yes">_Words</attribute>
        <attribute name="action">win.show-words</attribute>
      </item>
      <item>
        <attribute name="label" translatable="yes">_Lines</attribute>
        <attribute name="action">win.show-lines</attribute>
      </item>
      <item>
        <attribute name="label" translatable="yes">_Preferences</attribute>
        <attribute name="action">app.preferences</attribute>
      </item>
    </section>
    <section>
      <item>
        <attribute name="label" translatable="yes">_Quit</attribute>
        <attribute name="action">app.quit</attribute>
      </item>
    </section>
  </menu>
</interface>

main.c

#include <gtk/gtk.h>

#include "exampleapp.h"

int
main (int argc, char *argv[])
{
  /* Since this example is running uninstalled,
   * we have to help it find its schema. This
   * is *not* necessary in properly installed
   * application.
   */
  g_setenv ("GSETTINGS_SCHEMA_DIR", ".", FALSE);

  return g_application_run (G_APPLICATION (example_app_new ()), argc, argv);
}

Makefile.example

CC ?= gcc
PKGCONFIG = $(shell which pkg-config)
CFLAGS = $(shell $(PKGCONFIG) --cflags gtk4)
LIBS = $(shell $(PKGCONFIG) --libs gtk4)
GLIB_COMPILE_RESOURCES = $(shell $(PKGCONFIG) --variable=glib_compile_resources gio-2.0)
GLIB_COMPILE_SCHEMAS = $(shell $(PKGCONFIG) --variable=glib_compile_schemas gio-2.0)

SRC = exampleapp.c exampleappwin.c exampleappprefs.c main.c
BUILT_SRC = resources.c

OBJS = $(BUILT_SRC:.c=.o) $(SRC:.c=.o)

all: exampleapp

org.gtk.exampleapp.gschema.valid: org.gtk.exampleapp.gschema.xml
	$(GLIB_COMPILE_SCHEMAS) --strict --dry-run --schema-file=$< && mkdir -p $(@D) && touch $@

gschemas.compiled: org.gtk.exampleapp.gschema.valid
	$(GLIB_COMPILE_SCHEMAS) .

resources.c: exampleapp.gresource.xml $(shell $(GLIB_COMPILE_RESOURCES) --sourcedir=. --generate-dependencies exampleapp.gresource.xml)
	$(GLIB_COMPILE_RESOURCES) exampleapp.gresource.xml --target=$@ --sourcedir=. --generate-source

%.o: %.c
	$(CC) -c -o $(@F) $(CFLAGS) $<

exampleapp: $(OBJS) gschemas.compiled
	$(CC) -o $(@F) $(OBJS) $(LIBS)

clean:
	rm -f org.gtk.exampleapp.gschema.valid
	rm -f gschemas.compiled
	rm -f $(BUILT_SRC)
	rm -f $(OBJS)
	rm -f exampleapp

meson.build

app9_resources = gnome.compile_resources('exampleapp9_resources',
  'exampleapp.gresource.xml',
  source_dir: '.')

app9_schemas = gnome.compile_schemas()

executable('exampleapp9',
  'main.c',
  'exampleapp.c',
  'exampleappwin.c',
  'exampleappprefs.c',
  app9_resources,
  app9_schemas,
  dependencies: libgtk_dep,
  c_args: common_cflags)

org.gtk.exampleapp.gschema.xml

<?xml version="1.0" encoding="UTF-8"?>
<schemalist>
  <schema path="/org/gtk/exampleapp/" id="org.gtk.exampleapp">
    <key name="font" type="s">
      <default>'Monospace 12'</default>
      <summary>Font</summary>
      <description>The font to be used for content.</description>
    </key>
    <key name="transition" type="s">
      <choices>
        <choice value='none'/>
        <choice value='crossfade'/>
        <choice value='slide-left-right'/>
      </choices>
      <default>'none'</default>
      <summary>Transition</summary>
      <description>The transition to use when switching tabs.</description>
    </key>
    <key name="show-words" type="b">
      <default>false</default>
      <summary>Show words</summary>
      <description>Whether to show a word list in the sidebar</description>
    </key>
  </schema>
</schemalist>

prefs.ui

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <template class="ExampleAppPrefs" parent="GtkDialog">
    <property name="title" translatable="yes">Preferences</property>
    <property name="resizable">0</property>
    <property name="modal">1</property>
    <child internal-child="content_area">
      <object class="GtkBox" id="content_area">
        <child>
          <object class="GtkGrid" id="grid">
            <property name="margin-start">12</property>
            <property name="margin-end">12</property>
            <property name="margin-top">12</property>
            <property name="margin-bottom">12</property>
            <property name="row-spacing">12</property>
            <property name="column-spacing">12</property>
            <child>
              <object class="GtkLabel" id="fontlabel">
                <property name="label">_Font:</property>
                <property name="use-underline">1</property>
                <property name="mnemonic-widget">font</property>
                <property name="xalign">1</property>
                <layout>
                  <property name="column">0</property>
                  <property name="row">0</property>
                </layout>
              </object>
            </child>
            <child>
              <object class="GtkFontButton" id="font">
                <layout>
                  <property name="column">1</property>
                  <property name="row">0</property>
                </layout>
              </object>
            </child>
            <child>
              <object class="GtkLabel" id="transitionlabel">
                <property name="label">_Transition:</property>
                <property name="use-underline">1</property>
                <property name="mnemonic-widget">transition</property>
                <property name="xalign">1</property>
                <layout>
                  <property name="column">0</property>
                  <property name="row">1</property>
                </layout>
              </object>
            </child>
            <child>
              <object class="GtkComboBoxText" id="transition">
                <items>
                  <item translatable="yes" id="none">None</item>
                  <item translatable="yes" id="crossfade">Fade</item>
                  <item translatable="yes" id="slide-left-right">Slide</item>
                </items>
                <layout>
                  <property name="column">1</property>
                  <property name="row">1</property>
                </layout>
              </object>
            </child>
          </object>
        </child>
      </object>
    </child>
  </template>
</interface>

window.ui

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <template class="ExampleAppWindow" parent="GtkApplicationWindow">
    <property name="title" translatable="yes">Example Application</property>
    <property name="default-width">600</property>
    <property name="default-height">400</property>
    <child type="titlebar">
      <object class="GtkHeaderBar" id="header">
        <child>
          <object class="GtkLabel" id="lines_label">
            <property name="visible">0</property>
            <property name="label" translatable="yes">Lines:</property>
          </object>
        </child>
        <child>
          <object class="GtkLabel" id="lines">
            <property name="visible">0</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">0</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">
                <signal name="search-changed" handler="search_text_changed"/>
              </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">
                <signal name="notify::visible-child" handler="visible_child_changed"/>
              </object>
            </child>
          </object>
        </child>
      </object>
    </child>
  </template>
</interface>