[mutter] backends: Add API to trigger actions related to pad buttons

[Carlos Garnacho <carlosg src gnome org>]

commit 8e6244238d4b67a6004d5f83dd6f6c85d4b80cbd
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jun 22 18:51:27 2016 +0200

    backends: Add API to trigger actions related to pad buttons
    
    It does nothing at the moment, but can be hooked into MetaWaylandTabletPad
    now. For X11, we need to trigger these for the pad events we receive from
    the passive pad button grabs.

 src/backends/meta-input-settings-private.h |    9 +++
 src/backends/meta-input-settings.c         |   79 ++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/meta-input-settings-private.h b/src/backends/meta-input-settings-private.h
index a9d448e..e41918e 100644
--- a/src/backends/meta-input-settings-private.h
+++ b/src/backends/meta-input-settings-private.h
@@ -115,6 +115,15 @@ gdouble                    meta_input_settings_translate_tablet_tool_pressure (M
                                                                                ClutterInputDevice     
*current_tablet,
                                                                                gdouble                 
pressure);
 
+gboolean                   meta_input_settings_is_pad_button_grabbed     (MetaInputSettings  *input_settings,
+                                                                          ClutterInputDevice *pad,
+                                                                          guint               button);
+
+gboolean                   meta_input_settings_handle_pad_button         (MetaInputSettings  *input_settings,
+                                                                          ClutterInputDevice *pad,
+                                                                          gboolean            is_press,
+                                                                          guint               button);
+
 #ifdef HAVE_LIBWACOM
 WacomDevice * meta_input_settings_get_tablet_wacom_device (MetaInputSettings *settings,
                                                            ClutterInputDevice *device);
diff --git a/src/backends/meta-input-settings.c b/src/backends/meta-input-settings.c
index 30a391d..fd6ca67 100644
--- a/src/backends/meta-input-settings.c
+++ b/src/backends/meta-input-settings.c
@@ -1036,6 +1036,25 @@ lookup_tool_settings (ClutterInputDeviceTool *tool,
   return tool_settings;
 }
 
+static GSettings *
+lookup_pad_button_settings (ClutterInputDevice *device,
+                            guint               button)
+{
+  const gchar *vendor, *product;
+  GSettings *settings;
+  gchar *path;
+
+  vendor = clutter_input_device_get_vendor_id (device);
+  product = clutter_input_device_get_product_id (device);
+  path = g_strdup_printf ("/org/gnome/desktop/peripherals/tablets/%s:%s/button%c/",
+                          vendor, product, 'A' + button);
+  settings = g_settings_new_with_path ("org.gnome.desktop.peripherals.tablet.pad-button",
+                                       path);
+  g_free (path);
+
+  return settings;
+}
+
 static void
 monitors_changed_cb (MetaMonitorManager *monitor_manager,
                      MetaInputSettings  *input_settings)
@@ -1300,6 +1319,26 @@ meta_input_settings_get_stylus_button_action (MetaInputSettings      *input_sett
     return G_DESKTOP_STYLUS_BUTTON_ACTION_DEFAULT;
 }
 
+static GDesktopPadButtonAction
+meta_input_settings_get_pad_button_action (MetaInputSettings   *input_settings,
+                                           ClutterInputDevice  *pad,
+                                           guint                button)
+{
+  GDesktopPadButtonAction action;
+  GSettings *settings;
+
+  g_return_val_if_fail (META_IS_INPUT_SETTINGS (input_settings),
+                        G_DESKTOP_PAD_BUTTON_ACTION_NONE);
+  g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (pad),
+                        G_DESKTOP_PAD_BUTTON_ACTION_NONE);
+
+  settings = lookup_pad_button_settings (pad, button);
+  action = g_settings_get_enum (settings, "action");
+  g_object_unref (settings);
+
+  return action;
+}
+
 #ifdef HAVE_LIBWACOM
 WacomDevice *
 meta_input_settings_get_tablet_wacom_device (MetaInputSettings *settings,
@@ -1362,3 +1401,43 @@ meta_input_settings_translate_tablet_tool_pressure (MetaInputSettings      *inpu
                                         tool_settings->curve[3]);
   return pressure;
 }
+
+gboolean
+meta_input_settings_is_pad_button_grabbed (MetaInputSettings  *input_settings,
+                                           ClutterInputDevice *pad,
+                                           guint               button)
+{
+  g_return_val_if_fail (META_IS_INPUT_SETTINGS (input_settings), FALSE);
+  g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (pad), FALSE);
+  g_return_val_if_fail (clutter_input_device_get_device_type (pad) ==
+                        CLUTTER_PAD_DEVICE, FALSE);
+
+  return (meta_input_settings_get_pad_button_action (input_settings, pad, button) !=
+          G_DESKTOP_PAD_BUTTON_ACTION_NONE);
+}
+
+gboolean
+meta_input_settings_handle_pad_button (MetaInputSettings  *input_settings,
+                                       ClutterInputDevice *pad,
+                                       gboolean            is_press,
+                                       guint               button)
+{
+  GDesktopPadButtonAction action;
+
+  g_return_val_if_fail (META_IS_INPUT_SETTINGS (input_settings), FALSE);
+  g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (pad), FALSE);
+  g_return_val_if_fail (clutter_input_device_get_device_type (pad) ==
+                        CLUTTER_PAD_DEVICE, FALSE);
+
+  action = meta_input_settings_get_pad_button_action (input_settings, pad, button);
+
+  switch (action)
+    {
+    case G_DESKTOP_PAD_BUTTON_ACTION_SWITCH_MONITOR:
+    case G_DESKTOP_PAD_BUTTON_ACTION_KEYBINDING:
+    case G_DESKTOP_PAD_BUTTON_ACTION_HELP:
+    case G_DESKTOP_PAD_BUTTON_ACTION_NONE:
+    default:
+      return FALSE;
+    }
+}