自学教程：C++ GTK_HEADER_BAR函数代码示例

GtkWidget *create_header_bar (GtkWidget *dialog, const gchar *title){    static GtkWidget *header_bar = NULL;    header_bar = gtk_header_bar_new();    gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (header_bar), FALSE);    gtk_header_bar_set_title (GTK_HEADER_BAR (header_bar), title);    gtk_header_bar_set_has_subtitle (GTK_HEADER_BAR (header_bar), FALSE);    gtk_window_set_titlebar (GTK_WINDOW (dialog), header_bar);    return header_bar;}

static voidglade_gtk_header_bar_set_size (GObject * object,                               const GValue * value){  GList *l, *next, *children;  GtkWidget *child;  guint new_size, old_size, i;  g_return_if_fail (GTK_IS_HEADER_BAR (object));  d(g_message ("Setting size to %d", g_value_get_int (value)));  if (glade_util_object_is_loading (object))    return;  children = gtk_container_get_children (GTK_CONTAINER (object));  l = children;  while (l)    {      next = l->next;      if (l->data == gtk_header_bar_get_custom_title (GTK_HEADER_BAR (object)) ||          (!glade_widget_get_from_gobject (l->data) && !GLADE_IS_PLACEHOLDER (l->data)))        children = g_list_delete_link (children, l);      l = next;    }   old_size = g_list_length (children);  new_size = g_value_get_int (value);  if (old_size == new_size)    {      g_list_free (children);      return;    }  for (i = old_size; i < new_size; i++)    {      GtkWidget *placeholder = glade_placeholder_new ();      gtk_header_bar_pack_start (GTK_HEADER_BAR (object), placeholder);    }  for (l = g_list_last (children); l && old_size > new_size; l = l->prev)    {      child = l->data;      if (glade_widget_get_from_gobject (child) || !GLADE_IS_PLACEHOLDER (child))        continue;      gtk_container_remove (GTK_CONTAINER (object), child);      old_size--;    }  g_list_free (children);}

static voidgs_editor_refresh_file (GsEditor *self, GFile *file){	GtkWidget *widget;	/* set subtitle */	widget = GTK_WIDGET (gtk_builder_get_object (self->builder, "headerbar_main"));	if (file != NULL) {		g_autofree gchar *basename = g_file_get_basename (file);		gtk_header_bar_set_subtitle (GTK_HEADER_BAR (widget), basename);	} else {		gtk_header_bar_set_subtitle (GTK_HEADER_BAR (widget), NULL);	}}

static voidchange_subtitle (GtkButton *button, gpointer data){  GtkWidget *headerbar = GTK_WIDGET (data);  if (gtk_header_bar_get_subtitle (GTK_HEADER_BAR (headerbar)) == NULL)    {      gtk_header_bar_set_subtitle (GTK_HEADER_BAR (headerbar), "(subtle subtitle)");    }  else    {      gtk_header_bar_set_subtitle (GTK_HEADER_BAR (headerbar), NULL);    }}

static voidchange_title (GtkButton *button, gpointer data){  GtkWidget *headerbar = GTK_WIDGET (data);  if (gtk_header_bar_get_custom_title (GTK_HEADER_BAR (headerbar)) == NULL)    {      gtk_header_bar_set_custom_title (GTK_HEADER_BAR (headerbar), gtk_check_button_new_with_label ("Middle"));    }  else    {      gtk_header_bar_set_custom_title (GTK_HEADER_BAR (headerbar), NULL);      gtk_header_bar_set_title (GTK_HEADER_BAR (headerbar), "Middle");    }}

static voidgaru_headerbar_init_playback_buttons (GaruHeaderbar *self){  GSettings       *settings;  GaruApplication *app;  GtkWidget       *box, *button, *image;  app = GARU_APPLICATION (g_application_get_default ());  settings = garu_application_get_settings (app);  box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 5);  /* shuffle */  button = garu_utils_new_icon_button ("media-playlist-shuffle-symbolic",				       TRUE, FALSE);  gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 0);  gtk_widget_show (button);  /* repeat */  button = garu_utils_new_icon_button ("media-playlist-repeat-symbolic",				       TRUE, FALSE);    gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 0);  gtk_widget_show (button);  /* volume */  button = gtk_volume_button_new ();  gtk_scale_button_set_value (GTK_SCALE_BUTTON (button), 1);  g_settings_bind (settings, "volume", button, "value",                   G_SETTINGS_BIND_DEFAULT);  gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 0);  gtk_widget_show (button);  gtk_header_bar_pack_end (GTK_HEADER_BAR (self), box);  gtk_widget_show (box);}

static voidgaru_headerbar_init (GaruHeaderbar *self){  GaruApplication *app;  GSettings       *settings;  GaruPlayer      *player;  self->timeout_id = 0;  garu_headerbar_init_playback_buttons (self);  garu_headerbar_init_song_box (self);  garu_headerbar_init_control_buttons (self);  gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (self), TRUE);  app = GARU_APPLICATION (g_application_get_default ());  settings = garu_application_get_settings (app);  player = garu_application_get_player (app);  /* signals */  g_settings_bind (settings, "show-settings-button",                   self, "show-settings-button", G_SETTINGS_BIND_GET);  g_signal_connect (player, "playing",                    G_CALLBACK (garu_headerbar_new_playing), self);}

static void fake_gtk_header_bar_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec){    /* We haven't determined the property yet... */    if (G_UNLIKELY(PROP_SHOW_CLOSE_BUTTON == -1)) {        GParamSpec *spec = g_object_class_find_property(G_OBJECT_GET_CLASS(object), "show-close-button");        if (spec)            /* Technically, this is marked as internal in GParamSpec,             * but it's the only way to access that trivially. It's             * been stable in gobject for over a decade now. */            PROP_SHOW_CLOSE_BUTTON = spec->param_id;        else            /* We couldn't find out, for some reason. The value -2             * will never match a valid property id, so should be safe. */            PROP_SHOW_CLOSE_BUTTON = -2;    }    /* In theory, we shouldn't need to override this, since     * set_property in the gtk3 source code just calls that function,     * but with active compiler optimization, an inline version of it     * may be copied into set_propery, so we also need to override     * this here. */    if(G_UNLIKELY((int)prop_id == PROP_SHOW_CLOSE_BUTTON))        gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (object), FALSE);    else        orig_gtk_header_bar_set_property (object, prop_id, value, pspec);}

static voidsetup_search (GtkAppChooserDialog *self){  gboolean use_header;  g_object_get (self, "use-header-bar", &use_header, NULL);  if (use_header)    {      GtkWidget *button;      GtkWidget *image;      GtkWidget *header;      button = gtk_toggle_button_new ();      gtk_widget_set_valign (button, GTK_ALIGN_CENTER);      image = gtk_image_new_from_icon_name ("edit-find-symbolic", GTK_ICON_SIZE_MENU);      gtk_widget_show (image);      gtk_container_add (GTK_CONTAINER (button), image);      gtk_style_context_add_class (gtk_widget_get_style_context (button), "image-button");      gtk_style_context_remove_class (gtk_widget_get_style_context (button), "text-button");      gtk_widget_show (button);      header = gtk_dialog_get_header_bar (GTK_DIALOG (self));      gtk_header_bar_pack_end (GTK_HEADER_BAR (header), button);      g_object_bind_property (button, "active",                              self->priv->search_bar, "search-mode-enabled",                              G_BINDING_BIDIRECTIONAL);      g_object_bind_property (self->priv->search_entry, "sensitive",                              button, "sensitive",                              G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE);    }}

gbooleanreader_window_load_document(ReaderWindow *reader,                            const gchar *filename){	ReaderWindowPrivate *priv = READER_WINDOW_PRIVATE(reader);	if (reader_document_view_load_document(READER_DOCUMENT_VIEW(priv->view), filename))	{		CainteoirDocument *doc = reader_document_view_get_document(READER_DOCUMENT_VIEW(priv->view));		CainteoirMetadata *metadata = cainteoir_document_get_metadata(doc);		gchar *title = cainteoir_metadata_get_string(metadata, CAINTEOIR_METADATA_TITLE);		reader_application_set_active_document(priv->application, doc);		const gchar *doc_title = title ? title : i18n("Cainteoir Text-to-Speech");		gtk_header_bar_set_title(GTK_HEADER_BAR(priv->header), doc_title);		if (title) g_free(title);		g_object_unref(G_OBJECT(metadata));		g_object_unref(G_OBJECT(doc));		reset_timebar(priv);		return TRUE;	}	return FALSE;}

/* * create_page: * @child: the #CheeseWidget to pack into the container * @button: the #GtkButton for taking a photo * * Create the widgets for the #CheeseAvatarWidget and pack them into a * container. * * Returns: a #GtkBox containing the individual #CheeseAvatarWidget widgets */static GtkWidget *create_page (GtkWidget *child,             GtkWidget *button){    GtkWidget *vgrid, *bar;    GtkStyleContext *context;    vgrid = gtk_grid_new ();    gtk_grid_attach (GTK_GRID (vgrid),                     child, 0, 0, 1, 1);    gtk_widget_set_hexpand (child, TRUE);    gtk_widget_set_vexpand (child, TRUE);    bar = gtk_header_bar_new ();    context = gtk_widget_get_style_context (GTK_WIDGET (bar));    gtk_style_context_remove_class (context, "header-bar");    gtk_style_context_add_class (context, "inline-toolbar");    gtk_style_context_add_class (context, "toolbar");    gtk_style_context_add_class (context, GTK_STYLE_CLASS_HORIZONTAL);    g_object_set (G_OBJECT (button), "margin-top", 6, "margin-bottom", 6, NULL);    gtk_header_bar_set_custom_title (GTK_HEADER_BAR (bar), button);    gtk_grid_attach (GTK_GRID (vgrid),                     bar, 0, 1, 1, 1);    return vgrid;}

static voidgs_shell_set_header_end_widget (GsShell *shell, GtkWidget *widget){	GsShellPrivate *priv = gs_shell_get_instance_private (shell);	GtkWidget *old_widget;	GtkWidget *header;	old_widget = priv->header_end_widget;	header = GTK_WIDGET (gtk_builder_get_object (priv->builder, "header"));	if (priv->header_end_widget == widget)		return;	if (widget != NULL) {		g_object_ref (widget);		gtk_header_bar_pack_end (GTK_HEADER_BAR (header), widget);	}	priv->header_end_widget = widget;	if (old_widget != NULL) {		gtk_container_remove (GTK_CONTAINER (header), old_widget);		g_object_unref (old_widget);	}}

voidglade_gtk_header_bar_add_child (GladeWidgetAdaptor *adaptor,                                GObject *parent,                                GObject *child){  GladeWidget *gbox, *gchild;  gint size;  gchar *special_child_type;  gchild = glade_widget_get_from_gobject (child);  if (gchild)    glade_widget_set_pack_action_visible (gchild, "remove_slot", FALSE);  special_child_type = g_object_get_data (child, "special-child-type");  d(g_message ("Add %s %p (special: %s)",	       GLADE_IS_PLACEHOLDER (child) ? "placeholder" : "child",	       child, special_child_type));  if (special_child_type && !strcmp (special_child_type, "title"))    {      gtk_header_bar_set_custom_title (GTK_HEADER_BAR (parent), GTK_WIDGET (child));      return;    }  GWA_GET_CLASS (GTK_TYPE_CONTAINER)->add (adaptor, parent, child);    gbox = glade_widget_get_from_gobject (parent);  if (!glade_widget_superuser ())    {      glade_widget_property_get (gbox, "size", &size);      glade_widget_property_set (gbox, "size", size);    }}

void WebInspectorProxy::updateInspectorWindowTitle() const{    ASSERT(m_inspectorWindow);    if (m_inspectedURLString.isEmpty()) {        gtk_window_set_title(GTK_WINDOW(m_inspectorWindow), _("Web Inspector"));        return;    }#if GTK_CHECK_VERSION(3, 10, 0)    gtk_header_bar_set_title(GTK_HEADER_BAR(m_headerBar), _("Web Inspector"));    gtk_header_bar_set_subtitle(GTK_HEADER_BAR(m_headerBar), m_inspectedURLString.utf8().data());#else    GUniquePtr<gchar> title(g_strdup_printf("%s - %s", _("Web Inspector"), m_inspectedURLString.utf8().data()));    gtk_window_set_title(GTK_WINDOW(m_inspectorWindow), title.get());#endif}

void WebInspectorProxy::createInspectorWindow(){    if (m_client.openWindow(this))        return;    ASSERT(!m_inspectorWindow);    m_inspectorWindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);    GtkWidget* inspectedViewParent = gtk_widget_get_toplevel(inspectedPage()->viewWidget());    if (WebCore::widgetIsOnscreenToplevelWindow(inspectedViewParent))        gtk_window_set_transient_for(GTK_WINDOW(m_inspectorWindow), GTK_WINDOW(inspectedViewParent));#if GTK_CHECK_VERSION(3, 10, 0)    m_headerBar = gtk_header_bar_new();    gtk_header_bar_set_show_close_button(GTK_HEADER_BAR(m_headerBar), TRUE);    gtk_window_set_titlebar(GTK_WINDOW(m_inspectorWindow), m_headerBar);    gtk_widget_show(m_headerBar);#endif    updateInspectorWindowTitle();    gtk_window_set_default_size(GTK_WINDOW(m_inspectorWindow), initialWindowWidth, initialWindowHeight);    gtk_container_add(GTK_CONTAINER(m_inspectorWindow), m_inspectorView);    gtk_widget_show(m_inspectorView);    g_object_add_weak_pointer(G_OBJECT(m_inspectorWindow), reinterpret_cast<void**>(&m_inspectorWindow));    gtk_window_present(GTK_WINDOW(m_inspectorWindow));}

static voidselection_cb (GtkTreeSelection *selection,              GtkTreeModel     *model){  GtkTreeIter iter;  char *name;  char *filename;  char *title;  if (! gtk_tree_selection_get_selected (selection, NULL, &iter))    return;  gtk_tree_model_get (model, &iter,                      NAME_COLUMN, &name,                      TITLE_COLUMN, &title,                      FILENAME_COLUMN, &filename,                      -1);  if (filename)    load_file (name, filename);  gtk_header_bar_set_title (GTK_HEADER_BAR (headerbar), title);  g_free (name);  g_free (title);  g_free (filename);}

voidglade_gtk_header_bar_set_use_custom_title (GObject *object,					   gboolean use_custom_title){  GladeWidget *gwidget = glade_widget_get_from_gobject (object);  GtkWidget *child;  if (use_custom_title)    {      child = gtk_header_bar_get_custom_title (GTK_HEADER_BAR (object));      if (!child)	{	  child = glade_placeholder_new ();	  g_object_set_data (G_OBJECT (child), "special-child-type", "title");	}    }  else    child = NULL;  gtk_header_bar_set_custom_title (GTK_HEADER_BAR (object), child);  if (GLADE_IS_PLACEHOLDER (child))    {      GList *list, *l;      list = glade_placeholder_packing_actions (GLADE_PLACEHOLDER (child));      for (l = list; l; l = l->next)	{	  GladeWidgetAction *gwa = l->data;	  if (!strcmp (glade_widget_action_get_class (gwa)->id, "remove_slot"))	    glade_widget_action_set_visible (gwa, FALSE);	}    }  if (use_custom_title)    {      glade_widget_property_set_sensitive (gwidget, "title", FALSE, TITLE_DISABLED_MESSAGE);      glade_widget_property_set_sensitive (gwidget, "subtitle", FALSE, TITLE_DISABLED_MESSAGE);      glade_widget_property_set_sensitive (gwidget, "has-subtitle", FALSE, TITLE_DISABLED_MESSAGE);    }  else    {      glade_widget_property_set_sensitive (gwidget, "title", TRUE, NULL);      glade_widget_property_set_sensitive (gwidget, "subtitle", TRUE, NULL);      glade_widget_property_set_sensitive (gwidget, "has-subtitle", TRUE, NULL);    }}

static void_gth_window_add_header_bar (GthWindow *self){	self->priv->headerbar = gtk_header_bar_new ();	gtk_widget_show (self->priv->headerbar);	gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (self->priv->headerbar), TRUE);	g_object_add_weak_pointer (G_OBJECT (self->priv->headerbar), &self->priv->headerbar);#if GTK_CHECK_VERSION(3,12,0)	{		gboolean  shell_shows_app_menu;		char     *decoration_layout;		g_object_get (gtk_settings_get_default (),			      "gtk-shell-shows-app-menu", &shell_shows_app_menu,			      "gtk-decoration-layout", &decoration_layout,			      NULL);		if (! shell_shows_app_menu && ((decoration_layout == NULL) || (strstr (decoration_layout, "menu") == NULL))) {			gboolean  left_part_is_empty;			char     *new_layout;			/* add 'menu' to the left */			left_part_is_empty = (decoration_layout == NULL) || (decoration_layout[0] == '/0') || (decoration_layout[0] == ':');			new_layout = g_strconcat ("menu", (left_part_is_empty ? "" : ","), decoration_layout, NULL);			gtk_header_bar_set_decoration_layout (GTK_HEADER_BAR (self->priv->headerbar), new_layout);			g_free (new_layout);		}		g_free (decoration_layout);	}#endif	self->priv->title = gth_window_title_new ();	gtk_widget_show (self->priv->title);	gtk_header_bar_set_custom_title (GTK_HEADER_BAR (self->priv->headerbar), self->priv->title);	self->priv->headerbar_container = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);	gtk_widget_show (self->priv->headerbar_container);	gtk_box_pack_start (GTK_BOX (self->priv->headerbar_container), self->priv->headerbar, TRUE, TRUE, 0);	gtk_window_set_titlebar (GTK_WINDOW (self), self->priv->headerbar_container);}

static voidekiga_window_init_actions_toolbar (EkigaWindow *mw){  GtkWidget *image = NULL;  GtkWidget *button = NULL;  GtkWidget *switcher = NULL;  g_return_if_fail (EKIGA_IS_WINDOW (mw));  mw->priv->actions_toolbar = gtk_header_bar_new ();  gtk_window_set_titlebar (GTK_WINDOW (mw), mw->priv->actions_toolbar);  /* Start packing buttons */  button = gtk_button_new ();  image = gtk_image_new_from_icon_name ("call-start-symbolic", GTK_ICON_SIZE_MENU);  gtk_button_set_image (GTK_BUTTON (button), image);  gtk_widget_set_tooltip_text (GTK_WIDGET (button),                               _("Call the selected contact"));  gtk_actionable_set_detailed_action_name (GTK_ACTIONABLE (button), "win.call");  gtk_header_bar_pack_start (GTK_HEADER_BAR (mw->priv->actions_toolbar), button);  mw->priv->preview_button = gtk_toggle_button_new ();  image = gtk_image_new_from_icon_name ("camera-web-symbolic", GTK_ICON_SIZE_MENU);  gtk_button_set_image (GTK_BUTTON (mw->priv->preview_button), image);  gtk_widget_set_tooltip_text (GTK_WIDGET (mw->priv->preview_button),                               _("Display images from your camera device"));  gtk_actionable_set_detailed_action_name (GTK_ACTIONABLE (mw->priv->preview_button),                                           "win.enable-preview");  gtk_header_bar_pack_start (GTK_HEADER_BAR (mw->priv->actions_toolbar), mw->priv->preview_button);  switcher = gtk_stack_switcher_new ();  gtk_stack_switcher_set_stack (GTK_STACK_SWITCHER (switcher), GTK_STACK (mw->priv->main_stack));  gtk_header_bar_set_custom_title (GTK_HEADER_BAR (mw->priv->actions_toolbar), switcher);  gtk_widget_set_margin_end (GTK_WIDGET (switcher), 6);  mw->priv->menu_button = gtk_menu_button_new ();  g_object_set (G_OBJECT (mw->priv->menu_button), "use-popover", true, NULL);  image = gtk_image_new_from_icon_name ("open-menu-symbolic", GTK_ICON_SIZE_MENU);  gtk_button_set_image (GTK_BUTTON (mw->priv->menu_button), image);  gtk_header_bar_pack_end (GTK_HEADER_BAR (mw->priv->actions_toolbar), mw->priv->menu_button);  gtk_widget_show_all (mw->priv->actions_toolbar);  gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (mw->priv->actions_toolbar), TRUE);}

static voidgtimer_window_construct_ui (GTimerWindow *window){	GtkWidget *headerbar;	GtkWidget *gtimer_face;	g_return_if_fail (GTIMER_IS_WINDOW (window));	headerbar = gtk_header_bar_new ();	gtk_header_bar_set_show_close_button (GTK_HEADER_BAR (headerbar), TRUE);	gtk_header_bar_set_title (GTK_HEADER_BAR (headerbar), g_get_application_name ());	gtk_window_set_titlebar (GTK_WINDOW (window), headerbar);	gtimer_face = gtimer_face_new ();	gtk_container_add (GTK_CONTAINER (window), gtimer_face);	gtk_widget_show_all (GTK_WIDGET (window));}

static voidgaru_headerbar_init_song_box (GaruHeaderbar *self){  GtkWidget *song_box;  song_box = garu_song_box_new ();  gtk_header_bar_set_custom_title(GTK_HEADER_BAR(self), song_box);  gtk_widget_show (song_box);  self->song_box = GARU_SONG_BOX (song_box);}

static voidconversation_page_update_title_and_status (ConversationPage* self){  g_free (self->priv->title);  guint unread_count = self->priv->conversation->get_unread_messages_count ();  if (unread_count > 0) {    self->priv->title = g_strdup_printf ("[%d] %s",					 unread_count,					 self->priv->conversation->get_title ().c_str ());  } else {    self->priv->title = g_strdup_printf ("%s",					 self->priv->conversation->get_title ().c_str ());  }  gtk_header_bar_set_title (GTK_HEADER_BAR (self->priv->header), self->priv->title);  gtk_header_bar_set_subtitle (GTK_HEADER_BAR (self->priv->header),			       self->priv->conversation->get_status ().c_str ());}

voidide_workbench_header_bar_focus_search (IdeWorkbenchHeaderBar *self){  GtkWidget *entry;  g_return_if_fail (IDE_IS_WORKBENCH_HEADER_BAR (self));  entry = gtk_header_bar_get_custom_title (GTK_HEADER_BAR (self));  if (GTK_IS_ENTRY (entry))    gtk_widget_grab_focus (GTK_WIDGET (entry));}

GtkWidget *do_paint (GtkWidget *toplevel){  static GtkWidget *window = NULL;  if (!window)    {      GtkWidget *draw_area, *headerbar, *colorbutton;      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);      draw_area = drawing_area_new ();      gtk_container_add (GTK_CONTAINER (window), draw_area);      headerbar = gtk_header_bar_new ();      gtk_header_bar_set_title (GTK_HEADER_BAR (headerbar), "Paint");      gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (headerbar), TRUE);      colorbutton = gtk_color_button_new ();      g_signal_connect (colorbutton, "color-set",                        G_CALLBACK (color_button_color_set), draw_area);      g_signal_connect (draw_area, "color-set",                        G_CALLBACK (drawing_area_color_set), colorbutton);      gtk_color_chooser_set_rgba (GTK_COLOR_CHOOSER (colorbutton),                                  &(GdkRGBA) { 0, 0, 0, 1 });      gtk_header_bar_pack_end (GTK_HEADER_BAR (headerbar), colorbutton);      gtk_window_set_titlebar (GTK_WINDOW (window), headerbar);      g_signal_connect (window, "destroy",                        G_CALLBACK (gtk_widget_destroyed), &window);    }  if (!gtk_widget_get_visible (window))    gtk_widget_show (window);  else    gtk_widget_destroy (window);  return window;}

static voidexample_app_window_init (ExampleAppWindow *win){        gtk_widget_init_template (GTK_WIDGET (win));        ExampleAppWindowPrivate *priv = example_app_window_get_instance_private (win);        gtk_header_bar_set_decoration_layout (GTK_HEADER_BAR (priv->header), ":");        priv->open_button = gtk_button_new_from_icon_name ("document-open-symbolic", GTK_ICON_SIZE_BUTTON);        gtk_widget_set_valign (priv->open_button, GTK_ALIGN_CENTER);        gtk_header_bar_pack_start (GTK_HEADER_BAR (priv->header), priv->open_button);        gtk_widget_show (priv->open_button);        g_signal_connect (priv->open_button, "clicked", (GCallback) on_open_clicked, win);        priv->save_button = gtk_button_new_from_icon_name ("document-save-symbolic", GTK_ICON_SIZE_BUTTON);        gtk_widget_set_valign (priv->save_button, GTK_ALIGN_CENTER);        gtk_header_bar_pack_start (GTK_HEADER_BAR (priv->header), priv->save_button);        gtk_widget_show (priv->save_button);        g_signal_connect (priv->save_button, "clicked", (GCallback) on_save_clicked, win);        priv->cancel_button = gtk_button_new_from_icon_name ("process-error-symbolic", GTK_ICON_SIZE_BUTTON);        gtk_widget_set_valign (priv->cancel_button, GTK_ALIGN_CENTER);        gtk_header_bar_pack_end (GTK_HEADER_BAR (priv->header), priv->cancel_button);        gtk_widget_show (priv->cancel_button);        g_signal_connect (priv->cancel_button, "clicked", (GCallback) on_cancel_clicked, win);        priv->destroy_button = gtk_button_new_from_icon_name ("edit-delete-symbolic", GTK_ICON_SIZE_BUTTON);        gtk_widget_set_valign (priv->destroy_button, GTK_ALIGN_CENTER);        gtk_header_bar_pack_end (GTK_HEADER_BAR (priv->header), priv->destroy_button);        gtk_widget_show (priv->destroy_button);        g_signal_connect (priv->destroy_button, "clicked", (GCallback) on_destroy_clicked, win);}

static voidselection_changed_cb (GtkButton * button, gpointer vdata){  int i;  struct filter_data * data = vdata;  // If the button isn't active, we are not interested in it.  if (!gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (button))) return;  for (i = 0; i < MAX_FILTERS_ON_TOOLBAR; i++) {    if (GTK_WIDGET (button) == data->filters[i].widget) {      data->active_activity_type = data->filters[i].type;      switch (data->active_activity_type) {        case ACTIVITY_FILTER_ALL:        gtk_header_bar_set_subtitle(GTK_HEADER_BAR (data->header_bar), _("All"));        break;        case ACTIVITY_FILTER_DOWNLOADING:        gtk_header_bar_set_subtitle(GTK_HEADER_BAR (data->header_bar), _("Downloading"));        break;        case ACTIVITY_FILTER_SEEDING:        gtk_header_bar_set_subtitle(GTK_HEADER_BAR (data->header_bar), _("Seeding"));        break;        case ACTIVITY_FILTER_ACTIVE:        gtk_header_bar_set_subtitle(GTK_HEADER_BAR (data->header_bar), _("Active"));        break;        default:        break;      }    }  }  /* refilter */  gtk_tree_model_filter_refilter (GTK_TREE_MODEL_FILTER (data->filter_model));}