backends: Add function to retrieve the action mapped to an stylus button

This function will be useful for the wayland implementation, because buttons
are mapped at the time of sending those through the wire.
As x11/wayland implementations differ here, this function will be useful for
the wayland implementation, as the action is handled lat

src/backends/meta-input-settings-private.h

@@ -106,6 +106,10 @@ MetaInputSettings * meta_input_settings_create (void);
 GDesktopTabletMapping meta_input_settings_get_tablet_mapping (MetaInputSettings  *settings,
                                                               ClutterInputDevice *device);
 
+GDesktopStylusButtonAction meta_input_settings_get_stylus_button_action (MetaInputSettings      *settings,
+                                                                         ClutterInputDeviceTool *tool,
+                                                                         ClutterInputDevice     *current_device,
+                                                                         guint                   button);
 #ifdef HAVE_LIBWACOM
 WacomDevice * meta_input_settings_get_tablet_wacom_device (MetaInputSettings *settings,
                                                            ClutterInputDevice *device);

src/backends/meta-input-settings.c

@@ -40,8 +40,11 @@
 
 #include <meta/util.h>
 
+static GQuark quark_tool_settings = 0;
+
 typedef struct _MetaInputSettingsPrivate MetaInputSettingsPrivate;
 typedef struct _DeviceMappingInfo DeviceMappingInfo;
+typedef struct _ToolSettings ToolSettings;
 
 struct _DeviceMappingInfo
 {
@@ -53,6 +56,14 @@ struct _DeviceMappingInfo
 #endif
 };
 
+struct _ToolSettings
+{
+  GSettings *settings;
+  ClutterInputDeviceTool *tool;
+  GDesktopStylusButtonAction button_action;
+  GDesktopStylusButtonAction secondary_button_action;
+};
+
 struct _MetaInputSettingsPrivate
 {
   ClutterDeviceManager *device_manager;
@@ -910,6 +921,81 @@ lookup_device_settings (ClutterInputDevice *device)
   return settings;
 }
 
+static void
+tool_settings_changed_cb (GSettings    *settings,
+                          const gchar  *key,
+                          ToolSettings *tool_settings)
+{
+  if (strcmp (key, "button-action") == 0)
+    tool_settings->button_action = g_settings_get_enum (settings, "button-action");
+  else if (strcmp (key, "secondary-button-action") == 0)
+    tool_settings->secondary_button_action = g_settings_get_enum (settings, "secondary-button-action");
+}
+
+static ToolSettings *
+tool_settings_new (ClutterInputDeviceTool *tool,
+                   const gchar            *schema_path)
+{
+  ToolSettings *tool_settings;
+
+  tool_settings = g_new0 (ToolSettings, 1);
+  tool_settings->tool = tool;
+  tool_settings->settings =
+    g_settings_new_with_path ("org.gnome.desktop.peripherals.tablet.stylus",
+                              schema_path);
+
+  g_signal_connect (tool_settings->settings, "changed",
+                    G_CALLBACK (tool_settings_changed_cb), tool_settings);
+
+  /* Initialize values */
+  tool_settings->button_action =
+    g_settings_get_enum (tool_settings->settings, "button-action");
+  tool_settings->secondary_button_action =
+    g_settings_get_enum (tool_settings->settings, "secondary-button-action");
+
+  return tool_settings;
+}
+
+static void
+tool_settings_free (ToolSettings *tool_settings)
+{
+  g_object_unref (tool_settings->settings);
+  g_free (tool_settings);
+}
+
+static ToolSettings *
+lookup_tool_settings (ClutterInputDeviceTool *tool,
+                      ClutterInputDevice     *device)
+{
+  ToolSettings *tool_settings;
+  guint64 serial;
+  gchar *path;
+
+  tool_settings = g_object_get_qdata (G_OBJECT (tool), quark_tool_settings);
+  if (tool_settings)
+    return tool_settings;
+
+  serial = clutter_input_device_tool_get_serial (tool);
+
+  if (serial == 0)
+    {
+      path = g_strdup_printf ("/org/gnome/desktop/peripherals/stylus/default-%s:%s/",
+                              clutter_input_device_get_vendor_id (device),
+                              clutter_input_device_get_product_id (device));
+    }
+  else
+    {
+      path = g_strdup_printf ("/org/gnome/desktop/peripherals/stylus/%lx/", serial);
+    }
+
+  tool_settings = tool_settings_new (tool, path);
+  g_object_set_qdata_full (G_OBJECT (tool), quark_tool_settings, tool_settings,
+                           (GDestroyNotify) tool_settings_free);
+  g_free (path);
+
+  return tool_settings;
+}
+
 static void
 monitors_changed_cb (MetaMonitorManager *monitor_manager,
                      MetaInputSettings  *input_settings)
@@ -1067,6 +1153,9 @@ meta_input_settings_class_init (MetaInputSettingsClass *klass)
 
   object_class->dispose = meta_input_settings_dispose;
   object_class->constructed = meta_input_settings_constructed;
+
+  quark_tool_settings =
+    g_quark_from_static_string ("meta-input-settings-tool-settings");
 }
 
 static void
@@ -1148,6 +1237,29 @@ meta_input_settings_get_tablet_mapping (MetaInputSettings  *settings,
   return g_settings_get_enum (info->settings, "mapping");
 }
 
+GDesktopStylusButtonAction
+meta_input_settings_get_stylus_button_action (MetaInputSettings      *input_settings,
+                                              ClutterInputDeviceTool *tool,
+                                              ClutterInputDevice     *current_tablet,
+                                              guint                   button)
+{
+  ToolSettings *tool_settings;
+
+  g_return_val_if_fail (META_IS_INPUT_SETTINGS (input_settings),
+                        G_DESKTOP_STYLUS_BUTTON_ACTION_DEFAULT);
+  g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE_TOOL (tool),
+                        G_DESKTOP_STYLUS_BUTTON_ACTION_DEFAULT);
+
+  tool_settings = lookup_tool_settings (tool, current_tablet);
+
+  if (button == 2)
+    return tool_settings->button_action;
+  else if (button == 3)
+    return tool_settings->secondary_button_action;
+  else
+    return G_DESKTOP_STYLUS_BUTTON_ACTION_DEFAULT;
+}
+
 #ifdef HAVE_LIBWACOM
 WacomDevice *
 meta_input_settings_get_tablet_wacom_device (MetaInputSettings *settings,