tab scrolling: use mouse scrolling to switch between tabs

Submitted by Gabriel de Perthuis

Link to original bug (#145244)

Description

Here is a patch against gtk+-2.4.0/gtk/gtknotebook.c to allow for tab scrolling. A bit of history: this is a feature I first found in a mozilla extension, MiniT, and in workspace switchers for XFce and Kde.

Scrolling down moves to the right.

--- gtknotebook.c.orig  2004-06-28 20:46:22.000000000 +0200
+++ gtknotebook.c       2004-06-30 15:08:30.000000000 +0200
@@ -159,6 +159,8 @@
                                              GtkAllocation    *allocation);
 static gint gtk_notebook_expose              (GtkWidget        *widget,
                                              GdkEventExpose   *event);
+static gboolean gtk_notebook_scroll              (GtkWidget        *widget,
+                                              GdkEventScroll   *event);
 static gint gtk_notebook_button_press        (GtkWidget        *widget,
                                              GdkEventButton   *event);
 static gint gtk_notebook_button_release      (GtkWidget        *widget,
@@ -364,6 +366,7 @@
   widget_class->size_request = gtk_notebook_size_request;
   widget_class->size_allocate = gtk_notebook_size_allocate;
   widget_class->expose_event = gtk_notebook_expose;
+  widget_class->scroll_event = gtk_notebook_scroll;
   widget_class->button_press_event = gtk_notebook_button_press;
   widget_class->button_release_event = gtk_notebook_button_release;
   widget_class->enter_notify_event = gtk_notebook_enter_notify;
@@ -998,6 +1001,7 @@
  * gtk_notebook_size_request
  * gtk_notebook_size_allocate
  * gtk_notebook_expose
+ * gtk_notebook_scroll
  * gtk_notebook_button_press
  * gtk_notebook_button_release
  * gtk_notebook_enter_notify
@@ -1146,12 +1150,33 @@
   attributes.wclass = GDK_INPUT_ONLY;
   attributes.event_mask = gtk_widget_get_events (widget);
   attributes.event_mask |= (GDK_BUTTON_PRESS_MASK |
-                           GDK_BUTTON_RELEASE_MASK | GDK_KEY_PRESS_MASK);
+                           GDK_BUTTON_RELEASE_MASK | GDK_KEY_PRESS_MASK |
+                           GDK_SCROLL_MASK);
  attributes_mask = GDK_WA_X | GDK_WA_Y;
 @@ -1764,6 +1769,23 @@
     return FALSE;
 }

+static gboolean
+gtk_notebook_scroll (GtkWidget      *widget,
+                     GdkEventScroll *event)
+{
+  GtkNotebook *notebook = GTK_NOTEBOOK (widget);
+
+  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;
+    }
+
+  return TRUE;
+}
+
 static gboolean
 gtk_notebook_button_press (GtkWidget      *widget,
                           GdkEventButton *event)

See also

• Bug 630226