widget-factory: Demonstrate custom context menu items

Add bold/italics/underline styling to the context menu of
the 'Lorem ipsum...' text view in page 1. The point is not
to show good UI for this kind of styling, but to demonstrate
custom actions in the context menu / touch selection.

demos/widget-factory/widget-factory.c

@@ -1124,6 +1124,93 @@ page_combo_separator_func (GtkTreeModel *model,
   return res;
 }
 
+static void
+activate_item (GtkWidget *item, GtkTextView *tv)
+{
+  const gchar *tag;
+  GtkTextIter start, end;
+  gboolean active;
+
+  g_object_get (item, "active", &active, NULL);
+  tag = (const gchar *)g_object_get_data (G_OBJECT (item), "tag");
+  gtk_text_buffer_get_selection_bounds (gtk_text_view_get_buffer (tv), &start, &end);
+  if (active)
+    gtk_text_buffer_apply_tag_by_name (gtk_text_view_get_buffer (tv), tag, &start, &end);
+  else
+    gtk_text_buffer_remove_tag_by_name (gtk_text_view_get_buffer (tv), tag, &start, &end);
+}
+
+static void
+add_item (GtkTextView *tv,
+          GtkWidget   *popup,
+          const gchar *label,
+          const gchar *tag,
+          gboolean     set)
+{
+  GtkWidget *item;
+
+  if (GTK_IS_MENU (popup))
+    {
+      item = gtk_check_menu_item_new_with_label (label);
+      gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (item), set);
+      g_signal_connect (item, "toggled", G_CALLBACK (activate_item), tv);
+    }
+  else
+    {
+      item = gtk_check_button_new_with_label (label);
+      gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (item), set);
+      g_signal_connect (item, "clicked", G_CALLBACK (activate_item), tv);
+    }
+
+  g_object_set_data (G_OBJECT (item), "tag", (gpointer)tag);
+  gtk_widget_show (item);
+  gtk_container_add (GTK_CONTAINER (popup), item);
+}
+
+static void
+populate_popup (GtkTextView *tv,
+                GtkWidget   *popup)
+{
+  gboolean has_selection;
+  GtkWidget *item;
+  GtkTextIter start, end, iter;
+  GtkTextTagTable *tags;
+  GtkTextTag *bold, *italic, *underline;
+  gboolean all_bold, all_italic, all_underline;
+
+  has_selection = gtk_text_buffer_get_selection_bounds (gtk_text_view_get_buffer (tv), &start, &end);
+
+  if (!has_selection)
+    return;
+
+  tags = gtk_text_buffer_get_tag_table (gtk_text_view_get_buffer (tv));
+  bold = gtk_text_tag_table_lookup (tags, "bold");
+  italic = gtk_text_tag_table_lookup (tags, "italic");
+  underline = gtk_text_tag_table_lookup (tags, "underline");
+  all_bold = TRUE;
+  all_italic = TRUE;
+  all_underline = TRUE;
+  gtk_text_iter_assign (&iter, &start);
+  while (!gtk_text_iter_equal (&iter, &end))
+    {
+      all_bold &= gtk_text_iter_has_tag (&iter, bold);
+      all_italic &= gtk_text_iter_has_tag (&iter, italic);
+      all_underline &= gtk_text_iter_has_tag (&iter, underline);
+      gtk_text_iter_forward_char (&iter);
+    }
+
+  if (GTK_IS_MENU (popup))
+    {
+      item = gtk_separator_menu_item_new ();
+      gtk_widget_show (item);
+      gtk_container_add (GTK_CONTAINER (popup), item);
+    }
+
+  add_item (tv, popup, "Bold", "bold", all_bold);
+  add_item (tv, popup, "Italics", "italic", all_italic);
+  add_item (tv, popup, "Underline", "underline", all_underline);
+}
+
 static void
 activate (GApplication *app)
 {
@@ -1327,6 +1414,10 @@ activate (GApplication *app)
   widget2 = (GtkWidget *)gtk_builder_get_object (builder, "totem_like_osd");
   g_object_set_data (G_OBJECT (widget), "osd", widget2);
 
+  widget = (GtkWidget *)gtk_builder_get_object (builder, "textview1");
+  g_signal_connect (widget, "populate-popup",
+                    G_CALLBACK (populate_popup), NULL);
+
   gtk_widget_show_all (GTK_WIDGET (window));
 
   g_object_unref (builder);

demos/widget-factory/widget-factory.ui

@@ -162,7 +162,28 @@
       </row>
     </data>
   </object>
+  <object class="GtkTextTagTable" id="tags">
+    <child type="tag">
+      <object class="GtkTextTag">
+        <property name="name">bold</property>
+        <property name="weight">800</property>
+      </object>
+    </child>
+    <child type="tag">
+      <object class="GtkTextTag">
+        <property name="name">italic</property>
+        <property name="style">italic</property>
+      </object>
+    </child>
+    <child type="tag">
+      <object class="GtkTextTag">
+        <property name="name">underline</property>
+        <property name="underline">single</property>
+      </object>
+    </child>
+  </object>
   <object class="GtkTextBuffer" id="textbuffer1">
+    <property name="tag-table">tags</property>
     <property name="text">Lorem ipsum dolor sit amet, consectetur adipiscing elit.
 Nullam fringilla, est ut feugiat ultrices, elit lacus ultricies nibh, id commodo tortor nisi id elit.
 Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos.
@@ -1408,6 +1429,7 @@ Suspendisse feugiat quam quis dolor accumsan cursus.</property>
                                 <property name="wrap_mode">2</property>
                                 <property name="left_margin">10</property>
                                 <property name="right_margin">10</property>
+                                <property name="populate_all">True</property>
                               </object>
                             </child>
                           </object>