ev-properties-dialog: Add on_notebook_scroll_event

1 files changed, 64 insertions, 0 deletions

diff --git a/shell/ev-properties-dialog.c b/shell/ev-properties-dialog.c
index cbb7b0f7..91d08762 100644
--- a/shell/ev-properties-dialog.c
+++ b/shell/ev-properties-dialog.c
@@ -52,6 +52,64 @@ ev_properties_dialog_class_init (EvPropertiesDialogClass *properties_class)
 {
 }
 
+static gboolean
+on_notebook_scroll_event (GtkWidget        *widget,
+                          GdkEventScroll   *event)
+{
+        GtkNotebook *notebook = GTK_NOTEBOOK (widget);
+        GtkWidget *child, *event_widget, *action_widget;
+
+        child = gtk_notebook_get_nth_page (notebook, gtk_notebook_get_current_page (notebook));
+        if (child == NULL)
+                return FALSE;
+
+        event_widget = gtk_get_event_widget ((GdkEvent*) event);
+
+        /* Ignore scroll events from the content of the page */
+        if (event_widget == NULL || event_widget == child || gtk_widget_is_ancestor (event_widget, child))
+                return FALSE;
+
+        /* And also from the action widgets */
+        action_widget = gtk_notebook_get_action_widget (notebook, GTK_PACK_START);
+        if (event_widget == action_widget || (action_widget != NULL && gtk_widget_is_ancestor (event_widget, action_widget)))
+                return FALSE;
+
+        action_widget = gtk_notebook_get_action_widget (notebook, GTK_PACK_END);
+        if (event_widget == action_widget || (action_widget != NULL && gtk_widget_is_ancestor (event_widget, action_widget)))
+                return FALSE;
+
+        switch (event->direction) {
+                case GDK_SCROLL_RIGHT:
+                case GDK_SCROLL_DOWN:
+                        gtk_notebook_next_page (notebook);
+                        break;
+                case GDK_SCROLL_LEFT:
+                case GDK_SCROLL_UP:
+                        gtk_notebook_prev_page (notebook);
+                        break;
+                case GDK_SCROLL_SMOOTH:
+                        switch (gtk_notebook_get_tab_pos (notebook)) {
+                                case GTK_POS_LEFT:
+                                case GTK_POS_RIGHT:
+                                        if (event->delta_y > 0)
+                                                gtk_notebook_next_page (notebook);
+                                        else if (event->delta_y < 0)
+                                                gtk_notebook_prev_page (notebook);
+                                        break;
+                                case GTK_POS_TOP:
+                                case GTK_POS_BOTTOM:
+                                        if (event->delta_x > 0)
+                                                gtk_notebook_next_page (notebook);
+                                        else if (event->delta_x < 0)
+                                                gtk_notebook_prev_page (notebook);
+                                        break;
+                        }
+                        break;
+        }
+
+        return TRUE;
+}
+
 static void
 ev_properties_dialog_init (EvPropertiesDialog *properties)
 {
@@ -70,6 +128,12 @@ ev_properties_dialog_init (EvPropertiesDialog *properties)
 			                 GTK_RESPONSE_CANCEL);
 
 	properties->notebook = gtk_notebook_new ();
+	gtk_widget_add_events (properties->notebook, GDK_SCROLL_MASK);
+	g_signal_connect (properties->notebook,
+	                  "scroll-event",
+	                  G_CALLBACK (on_notebook_scroll_event),
+	                  NULL);
+
 	gtk_container_set_border_width (GTK_CONTAINER (properties->notebook), 5);
 	gtk_box_pack_start (content_area, properties->notebook, TRUE, TRUE, 0);
 	gtk_widget_show (properties->notebook);