[nautilus] window: Add tablet pad controller for common actions

[Carlos Garnacho <carlosg src gnome org>]

commit aae95a43be1afdccd703529c2594716d90e6aeaf
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 26 00:17:12 2017 +0200

    window: Add tablet pad controller for common actions
    
    Since nautilus is an important tool in the workflow of designers
    and other users of graphics tablets, make tablet pads useful by
    mapping a sensible set of actions that are not directly accessible
    with the stylus nor immediately require keyboard input.
    
    Tablet pads may vary a lot between devices, from 4 to 10+ buttons,
    besides rings/strips and multiple modes. It doesn't make a lot of
    sense for nautilus to handle those in detail, so this patch provides
    a mile-high support that should work reasonably well across the
    range of devices. Actions are made to apply on all modes, and the
    most sensible/less reachable options are assigned to lower button
    numbers.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=785443

 src/nautilus-window.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/src/nautilus-window.c b/src/nautilus-window.c
index bdfc024..951059a 100644
--- a/src/nautilus-window.c
+++ b/src/nautilus-window.c
@@ -143,6 +143,8 @@ typedef struct
     guint bookmarks_id;
 
     GQueue *tab_data_queue;
+
+    GtkPadController *pad_controller;
 } NautilusWindowPrivate;
 
 enum
@@ -186,6 +188,15 @@ static const struct
 #endif
 };
 
+static const GtkPadActionEntry pad_actions[] = {
+    { GTK_PAD_ACTION_BUTTON, 0, -1, N_("Parent folder"), "up" },
+    { GTK_PAD_ACTION_BUTTON, 1, -1, N_("Home"), "go-home" },
+    { GTK_PAD_ACTION_BUTTON, 2, -1, N_("New tab"), "new-tab" },
+    { GTK_PAD_ACTION_BUTTON, 3, -1, N_("Close current view"), "close-current-view" },
+    { GTK_PAD_ACTION_BUTTON, 4, -1, N_("Back"), "back" },
+    { GTK_PAD_ACTION_BUTTON, 5, -1, N_("Forward"), "forward" },
+};
+
 static void
 action_close_current_view (GSimpleAction *action,
                            GVariant      *state,
@@ -2586,6 +2597,8 @@ nautilus_window_finalize (GObject *object)
     g_queue_foreach (priv->tab_data_queue, (GFunc) free_restore_tab_data, NULL);
     g_queue_free (priv->tab_data_queue);
 
+    g_object_unref (priv->pad_controller);
+
     /* nautilus_window_close() should have run */
     g_assert (priv->slots == NULL);
 
@@ -2917,6 +2930,12 @@ nautilus_window_init (NautilusWindow *window)
     g_object_unref (window_group);
 
     priv->tab_data_queue = g_queue_new();
+
+    priv->pad_controller = gtk_pad_controller_new (GTK_WINDOW (window),
+                                                   G_ACTION_GROUP (window),
+                                                   NULL);
+    gtk_pad_controller_set_action_entries (priv->pad_controller,
+                                           pad_actions, G_N_ELEMENTS (pad_actions));
 }
 
 static void