[mutter/wip/carlosg/there-can-be-only-one: 1/3] backends: Unify cursor visibility checks

[Carlos Garnacho <carlosg src gnome org>]

commit 0fea0e383c1709f94974b3f1a650fc08502295dc
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Nov 2 15:49:01 2018 +0100

    backends: Unify cursor visibility checks
    
    Instead of having device type checks spread around, unify cursor
    visibility dependent on device availability on a single function.

 src/backends/meta-backend.c | 54 ++++++++++++++-------------------------------
 1 file changed, 16 insertions(+), 38 deletions(-)
---
diff --git a/src/backends/meta-backend.c b/src/backends/meta-backend.c
index 6d1c22e65..afbb41dc7 100644
--- a/src/backends/meta-backend.c
+++ b/src/backends/meta-backend.c
@@ -293,13 +293,6 @@ on_device_added (ClutterDeviceManager *device_manager,
   create_device_monitor (backend, device_id);
 }
 
-static inline gboolean
-device_is_slave_touchscreen (ClutterInputDevice *device)
-{
-  return (clutter_input_device_get_device_mode (device) != CLUTTER_INPUT_MODE_MASTER &&
-          clutter_input_device_get_device_type (device) == CLUTTER_TOUCHSCREEN_DEVICE);
-}
-
 static inline gboolean
 check_has_pointing_device (ClutterDeviceManager *manager)
 {
@@ -324,9 +317,10 @@ check_has_pointing_device (ClutterDeviceManager *manager)
 }
 
 static inline gboolean
-check_has_slave_touchscreen (ClutterDeviceManager *manager)
+check_pointer_visibility (ClutterDeviceManager *manager)
 {
   const GSList *devices;
+  gboolean pointer_visible = TRUE;
 
   devices = clutter_device_manager_peek_devices (manager);
 
@@ -336,10 +330,13 @@ check_has_slave_touchscreen (ClutterDeviceManager *manager)
 
       if (clutter_input_device_get_device_mode (device) != CLUTTER_INPUT_MODE_MASTER &&
           clutter_input_device_get_device_type (device) == CLUTTER_TOUCHSCREEN_DEVICE)
-        return TRUE;
+        {
+          pointer_visible = FALSE;
+          break;
+        }
     }
 
-  return FALSE;
+  return pointer_visible;
 }
 
 static void
@@ -359,26 +356,16 @@ on_device_removed (ClutterDeviceManager *device_manager,
   if (priv->current_device_id == device_id)
     {
       MetaCursorTracker *cursor_tracker = priv->cursor_tracker;
-      gboolean has_touchscreen, has_pointing_device;
-      ClutterInputDeviceType device_type;
+      gboolean pointer_hidden, has_pointing_device;
 
       priv->current_device_id = 0;
 
-      device_type = clutter_input_device_get_device_type (device);
-      has_touchscreen = check_has_slave_touchscreen (device_manager);
+      pointer_hidden = !check_pointer_visibility (device_manager);
+      has_pointing_device = check_has_pointing_device (device_manager);
 
-      if (device_type == CLUTTER_TOUCHSCREEN_DEVICE && has_touchscreen)
-        {
-          /* There's more touchscreens left, keep the pointer hidden */
-          meta_cursor_tracker_set_pointer_visible (cursor_tracker, FALSE);
-        }
-      else if (device_type != CLUTTER_KEYBOARD_DEVICE)
-        {
-          has_pointing_device = check_has_pointing_device (device_manager);
-          meta_cursor_tracker_set_pointer_visible (cursor_tracker,
-                                                   has_pointing_device &&
-                                                   !has_touchscreen);
-        }
+      meta_cursor_tracker_set_pointer_visible (cursor_tracker,
+                                               has_pointing_device &&
+                                               !pointer_hidden);
     }
 }
 
@@ -405,20 +392,11 @@ set_initial_pointer_visibility (MetaBackend          *backend,
                                 ClutterDeviceManager *device_manager)
 {
   MetaBackendPrivate *priv = meta_backend_get_instance_private (backend);
-  const GSList *devices;
-  const GSList *l;
-  gboolean has_touchscreen = FALSE;
-
-  devices = clutter_device_manager_peek_devices (device_manager);
-  for (l = devices; l; l = l->next)
-    {
-      ClutterInputDevice *device = l->data;
-
-      has_touchscreen |= device_is_slave_touchscreen (device);
-    }
+  gboolean pointer_visible;
 
+  pointer_visible = check_pointer_visibility (device_manager);
   meta_cursor_tracker_set_pointer_visible (priv->cursor_tracker,
-                                           !has_touchscreen);
+                                           pointer_visible);
 }
 
 static MetaInputSettings *