Allow GtkAppChooser classes to be instantiated with content-type=NULL.

Mostly for corner cases such as Glade that treats objects generically
and needs to have an object that doesnt crash out of g_object_new().

gtk/gtkappchooserbutton.c

@@ -248,7 +248,7 @@ gtk_app_chooser_button_ensure_dialog_item (GtkAppChooserButton *self,
 {
   GtkTreeIter iter, iter2;
 
-  if (!self->priv->show_dialog_item)
+  if (!self->priv->show_dialog_item || !self->priv->content_type)
     return;
 
   if (prev_iter == NULL)
@@ -275,6 +275,7 @@ gtk_app_chooser_button_populate (GtkAppChooserButton *self)
   gboolean cycled_recommended;
 
 #ifndef G_OS_WIN32
+  if (self->priv->content_type)
     recommended_apps = g_app_info_get_recommended_for_type (self->priv->content_type);
 #endif
   cycled_recommended = FALSE;
@@ -325,14 +326,6 @@ gtk_app_chooser_button_build_ui (GtkAppChooserButton *self)
   GtkCellRenderer *cell;
   GtkCellArea *area;
 
-  self->priv->store = gtk_list_store_new (NUM_COLUMNS,
-                                          G_TYPE_APP_INFO,
-                                          G_TYPE_STRING, /* name */
-                                          G_TYPE_STRING, /* label */
-                                          G_TYPE_ICON,
-                                          G_TYPE_BOOLEAN, /* separator */
-                                          G_TYPE_BOOLEAN); /* custom */
-
   gtk_combo_box_set_model (GTK_COMBO_BOX (self),
                            GTK_TREE_MODEL (self->priv->store));
 
@@ -457,8 +450,6 @@ gtk_app_chooser_button_constructed (GObject *obj)
   if (G_OBJECT_CLASS (gtk_app_chooser_button_parent_class)->constructed != NULL)
     G_OBJECT_CLASS (gtk_app_chooser_button_parent_class)->constructed (obj);
 
-  g_assert (self->priv->content_type != NULL);
-
   gtk_app_chooser_button_build_ui (self);
 }
 
@@ -521,6 +512,8 @@ gtk_app_chooser_button_finalize (GObject *obj)
   g_free (self->priv->content_type);
   g_free (self->priv->heading);
 
+  g_object_unref (self->priv->store);
+
   G_OBJECT_CLASS (gtk_app_chooser_button_parent_class)->finalize (obj);
 }
 
@@ -605,6 +598,14 @@ gtk_app_chooser_button_init (GtkAppChooserButton *self)
   self->priv->custom_item_names =
     g_hash_table_new_full (g_str_hash, g_str_equal,
                            g_free, NULL);
+
+  self->priv->store = gtk_list_store_new (NUM_COLUMNS,
+                                          G_TYPE_APP_INFO,
+                                          G_TYPE_STRING, /* name */
+                                          G_TYPE_STRING, /* label */
+                                          G_TYPE_ICON,
+                                          G_TYPE_BOOLEAN, /* separator */
+                                          G_TYPE_BOOLEAN); /* custom */
 }
 
 static gboolean

gtk/gtkappchooserdialog.c

@@ -170,6 +170,10 @@ app_chooser_online_get_default_ready_cb (GObject *source,
       g_signal_connect (self->priv->online_button, "clicked",
                         G_CALLBACK (online_button_clicked_cb), self);
 
+
+      if (!self->priv->content_type)
+	gtk_widget_set_sensitive (self->priv->online_button, FALSE);
+
       gtk_widget_show (self->priv->online_button);
     }
 }
@@ -247,6 +251,7 @@ add_or_find_application (GtkAppChooserDialog *self)
   app = gtk_app_chooser_get_app_info (GTK_APP_CHOOSER (self));
 
   /* we don't care about reporting errors here */
+  if (self->priv->content_type)
     g_app_info_set_as_last_used_for_type (app,
 					  self->priv->content_type,
 					  NULL);
@@ -313,12 +318,14 @@ set_dialog_properties (GtkAppChooserDialog *self)
   gchar *description;
   gchar *default_text;
   gchar *string;
+  gboolean unknown;
   PangoFontDescription *font_desc;
 
   name = NULL;
   extension = NULL;
   label = NULL;
   description = NULL;
+  unknown = TRUE;
 
   if (self->priv->gfile != NULL)
     {
@@ -326,7 +333,12 @@ set_dialog_properties (GtkAppChooserDialog *self)
       extension = get_extension (name);
     }
 
+  if (self->priv->content_type)
+    {
       description = g_content_type_get_description (self->priv->content_type);
+      unknown = g_content_type_is_unknown (self->priv->content_type);
+    }
+
   gtk_window_set_title (GTK_WINDOW (self), "");
 
   if (name != NULL)
@@ -340,11 +352,9 @@ set_dialog_properties (GtkAppChooserDialog *self)
     {
       /* Translators: %s is a file type description */
       label = g_strdup_printf (_("Select an application for \"%s\" files"),
-                               g_content_type_is_unknown (self->priv->content_type) ?
+                               unknown ? self->priv->content_type : description);
-                               self->priv->content_type : description);
       string = g_strdup_printf (_("No applications available to open \"%s\" files"),
-                               g_content_type_is_unknown (self->priv->content_type) ?
+                               unknown ? self->priv->content_type : description);
-                               self->priv->content_type : description);
     }
 
   font_desc = pango_font_description_new ();
@@ -575,9 +585,6 @@ gtk_app_chooser_dialog_constructed (GObject *object)
 {
   GtkAppChooserDialog *self = GTK_APP_CHOOSER_DIALOG (object);
 
-  g_assert (self->priv->content_type != NULL ||
-            self->priv->gfile != NULL);
-
   if (G_OBJECT_CLASS (gtk_app_chooser_dialog_parent_class)->constructed != NULL)
     G_OBJECT_CLASS (gtk_app_chooser_dialog_parent_class)->constructed (object);
 

gtk/gtkappchooserwidget.c

@@ -630,13 +630,15 @@ gtk_app_chooser_add_default (GtkAppChooserWidget *self,
 static void
 add_no_applications_label (GtkAppChooserWidget *self)
 {
-  gchar *text = NULL, *desc;
+  gchar *text = NULL, *desc = NULL;
   const gchar *string;
   GtkTreeIter iter;
 
   if (self->priv->default_text == NULL)
     {
+      if (self->priv->content_type)
 	desc = g_content_type_get_description (self->priv->content_type);
+
       string = text = g_strdup_printf (_("No applications available to open \"%s\""),
                                        desc);
       g_free (desc);
@@ -706,7 +708,7 @@ gtk_app_chooser_widget_real_add_items (GtkAppChooserWidget *self)
   if (self->priv->show_all)
     show_headings = FALSE;
 
-  if (self->priv->show_default)
+  if (self->priv->show_default && self->priv->content_type)
     {
       default_app = g_app_info_get_default_for_type (self->priv->content_type, FALSE);
 
@@ -719,8 +721,9 @@ gtk_app_chooser_widget_real_add_items (GtkAppChooserWidget *self)
     }
 
 #ifndef G_OS_WIN32
-  if (self->priv->show_recommended || self->priv->show_all)
+  if ((self->priv->content_type && self->priv->show_recommended) || self->priv->show_all)
     {
+      if (self->priv->content_type)
 	recommended_apps = g_app_info_get_recommended_for_type (self->priv->content_type);
 
       apps_added |= gtk_app_chooser_widget_add_section (self, _("Recommended Applications"),
@@ -733,8 +736,9 @@ gtk_app_chooser_widget_real_add_items (GtkAppChooserWidget *self)
                                     g_list_copy (recommended_apps));
     }
 
-  if (self->priv->show_fallback || self->priv->show_all)
+  if ((self->priv->content_type && self->priv->show_fallback) || self->priv->show_all)
     {
+      if (self->priv->content_type)
 	fallback_apps = g_app_info_get_fallback_for_type (self->priv->content_type);
 
       apps_added |= gtk_app_chooser_widget_add_section (self, _("Related Applications"),
@@ -953,8 +957,6 @@ gtk_app_chooser_widget_constructed (GObject *object)
 {
   GtkAppChooserWidget *self = GTK_APP_CHOOSER_WIDGET (object);
 
-  g_assert (self->priv->content_type != NULL);
-
   if (G_OBJECT_CLASS (gtk_app_chooser_widget_parent_class)->constructed != NULL)
     G_OBJECT_CLASS (gtk_app_chooser_widget_parent_class)->constructed (object);