Add gdk_window_[gs]et_source_events()

This function will enable events for all devices of a given
GdkInputSource, either these available at the time of the call,
or these that are connected in the future.

docs/reference/gdk/gdk3-sections.txt

@@ -478,6 +478,8 @@ gdk_window_get_device_cursor
 gdk_window_set_device_cursor
 gdk_window_get_device_events
 gdk_window_set_device_events
+gdk_window_get_source_events
+gdk_window_set_source_events
 
 <SUBSECTION>
 GdkPointerHooks

gdk/gdk.symbols

@@ -436,6 +436,7 @@ gdk_window_get_position
 gdk_window_get_root_coords
 gdk_window_get_root_origin
 gdk_window_get_screen
+gdk_window_get_source_events
 gdk_window_get_state
 gdk_window_get_support_multidevice
 gdk_window_get_toplevel
@@ -509,6 +510,7 @@ gdk_window_set_override_redirect
 gdk_window_set_role
 gdk_window_set_skip_pager_hint
 gdk_window_set_skip_taskbar_hint
+gdk_window_set_source_events
 gdk_window_set_startup_id
 gdk_window_set_static_gravities
 gdk_window_set_support_multidevice

gdk/gdkinternals.h

@@ -264,6 +264,10 @@ struct _GdkWindow
 
   GList *devices_inside;
   GHashTable *device_events;
+
+  GHashTable *source_event_masks;
+  gulong device_added_handler_id;
+  gulong device_changed_handler_id;
 };
 
 #define GDK_WINDOW_TYPE(d) (((GDK_WINDOW (d)))->window_type)

gdk/gdkwindow.c

@@ -576,6 +576,9 @@ gdk_window_finalize (GObject *object)
   if (window->device_events)
     g_hash_table_destroy (window->device_events);
 
+  if (window->source_event_masks)
+    g_hash_table_destroy (window->source_event_masks);
+
   if (window->devices_inside)
     g_list_free (window->devices_inside);
 
@@ -8906,6 +8909,143 @@ gdk_window_geometry_changed (GdkWindow *window)
   _gdk_synthesize_crossing_events_for_geometry_change (window);
 }
 
+static void
+source_events_device_added (GdkDeviceManager *device_manager,
+                            GdkDevice        *device,
+                            gpointer          user_data)
+{
+  GdkWindow *window;
+  GdkEventMask event_mask;
+  GdkInputSource source;
+
+  if (gdk_device_get_device_type (device) != GDK_DEVICE_TYPE_FLOATING)
+    return;
+
+  window = user_data;
+  source = gdk_device_get_source (device);
+
+  event_mask = GPOINTER_TO_INT (g_hash_table_lookup (window->source_event_masks,
+                                                     GINT_TO_POINTER (source)));
+  if (event_mask)
+    gdk_window_set_device_events (window, device, event_mask);
+}
+
+static void
+source_events_device_changed (GdkDeviceManager *device_manager,
+                              GdkDevice        *device,
+                              gpointer          user_data)
+{
+  GdkDeviceType type;
+  GdkInputSource source;
+  GdkEventMask event_mask;
+  GdkWindow *window;
+
+  window = user_data;
+  type = gdk_device_get_device_type (device);
+  source = gdk_device_get_source (device);
+
+  event_mask = GPOINTER_TO_INT (g_hash_table_lookup (window->source_event_masks,
+                                                     GINT_TO_POINTER (source)));
+
+  if (!event_mask)
+    return;
+
+  if (type == GDK_DEVICE_TYPE_FLOATING)
+    {
+      /* The device was just floated, enable its event mask */
+      gdk_window_set_device_events (window, device, event_mask);
+    }
+  else if (type == GDK_DEVICE_TYPE_SLAVE)
+    gdk_window_set_device_events (window, device, 0);
+}
+
+/**
+ * gdk_window_set_source_events:
+ * @window: a #GdkWindow
+ * @source: a #GdkInputSource to define the source class.
+ * @event_mask: event mask for @window
+ *
+ * Sets the event mask for any floating device (i.e. not attached to any
+ * visible pointer) that has the source defined as @source. This event
+ * mask will be applied both to currently existing, newly added devices
+ * after this call, and devices being attached/detached.
+ *
+ * Since: 3.0
+ **/
+void
+gdk_window_set_source_events (GdkWindow      *window,
+                              GdkInputSource  source,
+                              GdkEventMask    event_mask)
+{
+  GdkDeviceManager *device_manager;
+  GdkDisplay *display;
+  GList *devices, *d;
+  guint size;
+
+  g_return_if_fail (GDK_IS_WINDOW (window));
+
+  display = gdk_window_get_display (window);
+  device_manager = gdk_display_get_device_manager (display);
+
+  devices = gdk_device_manager_list_devices (device_manager, GDK_DEVICE_TYPE_FLOATING);
+
+  /* Set event mask for existing devices */
+  for (d = devices; d; d = d->next)
+    {
+      GdkDevice *device = d->data;
+
+      if (source == gdk_device_get_source (device))
+        gdk_window_set_device_events (window, device, event_mask);
+    }
+
+  /* Update accounting */
+  if (G_UNLIKELY (!window->source_event_masks))
+    window->source_event_masks = g_hash_table_new (NULL, NULL);
+
+  if (event_mask)
+    g_hash_table_insert (window->source_event_masks,
+                         GUINT_TO_POINTER (source),
+                         GUINT_TO_POINTER (event_mask));
+  else
+    g_hash_table_remove (window->source_event_masks,
+                         GUINT_TO_POINTER (source));
+
+  size = g_hash_table_size (window->source_event_masks);
+
+  /* Update handler if needed */
+  if (!window->device_added_handler_id && size > 0)
+    {
+      window->device_added_handler_id =
+        g_signal_connect (device_manager, "device-added",
+                          G_CALLBACK (source_events_device_added), window);
+      window->device_changed_handler_id =
+        g_signal_connect (device_manager, "device-changed",
+                          G_CALLBACK (source_events_device_changed), window);
+    }
+  else if (window->device_added_handler_id && size == 0)
+    g_signal_handler_disconnect (device_manager, window->device_added_handler_id);
+}
+
+/**
+ * gdk_window_get_source_events:
+ * @window: a #GdkWindow
+ * @source: a #GdkInputSource to define the source class.
+ *
+ * Returns the event mask for @window corresponding to the device class specified
+ * by @source.
+ *
+ * Returns: source event mask for @window
+ **/
+GdkEventMask
+gdk_window_get_source_events (GdkWindow      *window,
+                              GdkInputSource  source)
+{
+  g_return_val_if_fail (GDK_IS_WINDOW (window), 0);
+
+  return GPOINTER_TO_UINT (g_hash_table_lookup (window->source_event_masks,
+                                                GUINT_TO_POINTER (source)));
+}
+
 static gboolean
 do_synthesize_crossing_event (gpointer data)
 {

gdk/gdkwindow.h

@@ -778,6 +778,12 @@ void          gdk_window_set_device_events (GdkWindow    *window,
 GdkEventMask  gdk_window_get_device_events (GdkWindow    *window,
                                             GdkDevice    *device);
 
+void          gdk_window_set_source_events (GdkWindow      *window,
+                                            GdkInputSource  source,
+                                            GdkEventMask    event_mask);
+GdkEventMask  gdk_window_get_source_events (GdkWindow      *window,
+                                            GdkInputSource  source);
+
 void          gdk_window_set_icon_list   (GdkWindow       *window,
 					  GList           *pixbufs);
 void	      gdk_window_set_icon_name	 (GdkWindow	  *window,