Add ClutterDeviceManager

The ClutterDeviceManager is a singleton object that behaves like the
StageManager: it holds all input devices and notifies on addition and
removal.

clutter/Makefile.am

@@ -84,6 +84,7 @@ source_h =					\
 	$(srcdir)/clutter-color.h		\
 	$(srcdir)/clutter-container.h		\
 	$(srcdir)/clutter-deprecated.h		\
+	$(srcdir)/clutter-device-manager.h	\
 	$(srcdir)/clutter-event.h 		\
 	$(srcdir)/clutter-feature.h 		\
 	$(srcdir)/clutter-fixed.h 		\
@@ -154,6 +155,7 @@ source_c = \
 	$(srcdir)/clutter-clone.c		\
 	$(srcdir)/clutter-color.c 		\
 	$(srcdir)/clutter-container.c		\
+	$(srcdir)/clutter-device-manager.c	\
 	clutter-enum-types.c			\
 	$(srcdir)/clutter-event.c 		\
 	$(srcdir)/clutter-feature.c 		\

clutter/clutter-device-manager.c

@@ -0,0 +1,146 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "clutter-debug.h"
+#include "clutter-device-manager.h"
+#include "clutter-enum-types.h"
+#include "clutter-marshal.h"
+#include "clutter-private.h"
+
+#define CLUTTER_DEVICE_MANAGER_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_DEVICE_MANAGER, ClutterDeviceManagerClass))
+#define CLUTTER_IS_DEVICE_MANAGER_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_DEVICE_MANAGER))
+#define CLUTTER_DEVICE_MANAGER_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_DEVICE_MANAGER, ClutterDeviceManagerClass))
+
+typedef struct _ClutterDeviceManagerClass       ClutterDeviceManagerClass;
+
+struct _ClutterDeviceManagerClass
+{
+  GObjectClass parent_instance;
+};
+
+enum
+{
+  DEVICE_ADDED,
+  DEVICE_REMOVED,
+
+  LAST_SIGNAL
+};
+
+static ClutterDeviceManager *default_manager = NULL;
+
+static guint manager_signals[LAST_SIGNAL] = { 0, };
+
+G_DEFINE_TYPE (ClutterDeviceManager, clutter_device_manager, G_TYPE_OBJECT);
+
+static void
+clutter_device_manager_class_init (ClutterDeviceManagerClass *klass)
+{
+  manager_signals[DEVICE_ADDED] =
+    g_signal_new (I_("device-added"),
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  clutter_marshal_VOID__POINTER,
+                  G_TYPE_NONE, 1,
+                  G_TYPE_POINTER);
+
+  manager_signals[DEVICE_REMOVED] =
+    g_signal_new (I_("device-removed"),
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL,
+                  clutter_marshal_VOID__POINTER,
+                  G_TYPE_NONE, 1,
+                  G_TYPE_POINTER);
+}
+
+static void
+clutter_device_manager_init (ClutterDeviceManager *self)
+{
+}
+
+ClutterDeviceManager *
+clutter_device_manager_get_default (void)
+{
+  if (G_UNLIKELY (default_manager == NULL))
+    default_manager = g_object_new (CLUTTER_TYPE_DEVICE_MANAGER, NULL);
+
+  return default_manager;
+}
+
+GSList *
+clutter_device_manager_list_devices (ClutterDeviceManager *device_manager)
+{
+  g_return_val_if_fail (CLUTTER_IS_DEVICE_MANAGER (device_manager), NULL);
+
+  return g_slist_copy (device_manager->devices);
+}
+
+const GSList *
+clutter_device_manager_peek_devices (ClutterDeviceManager *device_manager)
+{
+  g_return_val_if_fail (CLUTTER_IS_DEVICE_MANAGER (device_manager), NULL);
+
+  return device_manager->devices;
+}
+
+ClutterInputDevice *
+clutter_device_manager_get_device (ClutterDeviceManager *device_manager,
+                                   gint                  device_id)
+{
+  GSList *l;
+
+  g_return_val_if_fail (CLUTTER_IS_DEVICE_MANAGER (device_manager), NULL);
+
+  for (l = device_manager->devices; l != NULL; l = l->next)
+    {
+      ClutterInputDevice *device = l->data;
+
+      if (device->id == device_id)
+        return device;
+    }
+
+  return NULL;
+}
+
+static gint
+input_device_cmp (gconstpointer a,
+                  gconstpointer b)
+{
+  const ClutterInputDevice *device_a = a;
+  const ClutterInputDevice *device_b = b;
+
+  if (device_a->id < device_b->id)
+    return -1;
+
+  if (device_a->id > device_b->id)
+    return 1;
+
+  return 0;
+}
+
+void
+_clutter_device_manager_add_device (ClutterDeviceManager *device_manager,
+                                    ClutterInputDevice   *device)
+{
+  g_return_if_fail (CLUTTER_IS_DEVICE_MANAGER (device_manager));
+
+  device_manager->devices = g_slist_insert_sorted (device_manager->devices,
+                                                   device,
+                                                   input_device_cmp);
+}
+
+void
+_clutter_device_manager_remove_device (ClutterDeviceManager *device_manager,
+                                       ClutterInputDevice   *device)
+{
+  g_return_if_fail (CLUTTER_IS_DEVICE_MANAGER (device_manager));
+
+  if (g_slist_find (device_manager->devices, device) == NULL)
+    return;
+
+  device_manager->devices = g_slist_remove (device_manager->devices, device);
+}

clutter/clutter-device-manager.h

@@ -0,0 +1,30 @@
+#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
+#error "Only <clutter/clutter.h> can be included directly."
+#endif
+
+#ifndef __CLUTTER_DEVICE_MANAGER_H__
+#define __CLUTTER_DEVICE_MANAGER_H__
+
+#include <glib-object.h>
+#include <clutter/clutter-event.h>
+
+G_BEGIN_DECLS
+
+#define CLUTTER_TYPE_DEVICE_MANAGER             (clutter_device_manager_get_type ())
+#define CLUTTER_DEVICE_MANAGER(obj)             (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_DEVICE_MANAGER, ClutterDeviceManager))
+#define CLUTTER_IS_DEVICE_MANAGER(obj)          (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_DEVICE_MANAGER))
+
+typedef struct _ClutterDeviceManager            ClutterDeviceManager;
+
+GType clutter_stage_manager_get_type (void) G_GNUC_CONST;
+
+ClutterDeviceManager *clutter_device_manager_get_default  (void);
+GSList *              clutter_device_manager_list_devices (ClutterDeviceManager *device_manager);
+const GSList *        clutter_device_manager_peek_devices (ClutterDeviceManager *device_manager);
+
+ClutterInputDevice *  clutter_device_manager_get_device   (ClutterDeviceManager *device_manager,
+                                                           gint                  device_id);
+
+G_END_DECLS
+
+#endif /* __CLUTTER_DEVICE_MANAGER_H__ */

clutter/clutter-main.c

@@ -3025,7 +3025,17 @@ clutter_get_font_flags (void)
  * clutter_get_input_device_for_id:
  * @id: a device id
  *
- * Retrieves the #ClutterInputDevice from its id.
+ * Retrieves the #ClutterInputDevice from its id. This is a convenience
+ * wrapper for clutter_device_manager_get_device() and it is functionally
+ * equivalent to:
+ *
+ * |[
+ *   ClutterDeviceManager *manager;
+ *   ClutterInputDevice *device;
+ *
+ *   manager = clutter_device_manager_get_default ();
+ *   device = clutter_device_manager_get_device (manager, id);
+ * ]|
  *
  * Return value: (transfer none): a #ClutterInputDevice, or %NULL
  *
@@ -3034,23 +3044,11 @@ clutter_get_font_flags (void)
 ClutterInputDevice *
 clutter_get_input_device_for_id (gint id)
 {
-  GSList *item;
+  ClutterDeviceManager *manager;
-  ClutterInputDevice *device = NULL;
-  ClutterMainContext  *context;
 
-  context = _clutter_context_get_default ();
+  manager = clutter_device_manager_get_default ();
 
-  for (item = context->input_devices;
+  return clutter_device_manager_get_device (manager, id);
-       item != NULL;
-       item = item->next)
-  {
-    device = item->data;
-
-    if (device->id == id)
-      return device;
-  }
-
-  return NULL;
 }
 
 /**

clutter/clutter-marshal.list

@@ -12,6 +12,7 @@ VOID:INT,INT,INT,INT
 VOID:OBJECT
 VOID:OBJECT,OBJECT,PARAM
 VOID:OBJECT,POINTER
+VOID:POINTER
 VOID:STRING,BOOLEAN,BOOLEAN
 VOID:STRING,INT
 VOID:UINT

clutter/clutter-private.h

@@ -41,6 +41,7 @@
 #include "pango/cogl-pango.h"
 
 #include "clutter-backend.h"
+#include "clutter-device-manager.h"
 #include "clutter-event.h"
 #include "clutter-feature.h"
 #include "clutter-id-pool.h"
@@ -52,6 +53,8 @@
 
 G_BEGIN_DECLS
 
+typedef struct _ClutterMainContext              ClutterMainContext;
+
 typedef enum {
   CLUTTER_ACTOR_UNUSED_FLAG    = 0,
 
@@ -96,7 +99,19 @@ struct _ClutterInputDevice
   gint previous_button_number;
 };
 
-typedef struct _ClutterMainContext ClutterMainContext;
+struct _ClutterStageManager
+{
+  GObject parent_instance;
+
+  GSList *stages;
+};
+
+struct _ClutterDeviceManager
+{
+  GObject parent_instance;
+
+  GSList *devices;
+};
 
 struct _ClutterMainContext
 {
@@ -170,21 +185,19 @@ PangoContext *_clutter_context_get_pango_context    (ClutterMainContext *self);
 
 #define I_(str)  (g_intern_static_string ((str)))
 
+/* device manager */
+void _clutter_device_manager_add_device    (ClutterDeviceManager *device_manager,
+                                            ClutterInputDevice   *device);
+void _clutter_device_manager_remove_device (ClutterDeviceManager *device_manager,
+                                            ClutterInputDevice   *device);
+
 /* stage manager */
-struct _ClutterStageManager
-{
-  GObject parent_instance;
-
-  GSList *stages;
-};
-
 void _clutter_stage_manager_add_stage    (ClutterStageManager *stage_manager,
                                           ClutterStage        *stage);
 void _clutter_stage_manager_remove_stage (ClutterStageManager *stage_manager,
                                           ClutterStage        *stage);
 
 /* stage */
-
 void                _clutter_stage_set_window           (ClutterStage       *stage,
                                                          ClutterStageWindow *stage_window);
 ClutterStageWindow *_clutter_stage_get_window           (ClutterStage       *stage);

clutter/clutter.h

@@ -51,6 +51,7 @@
 #include "clutter-clone.h"
 #include "clutter-color.h"
 #include "clutter-container.h"
+#include "clutter-device-manager.h"
 #include "clutter-event.h"
 #include "clutter-feature.h"
 #include "clutter-fixed-layout.h"