[gnome-control-center/wip/carlosg/ekr-loves-27qhd: 81/82] common: Add GsdDevice API to tell whether 2 devices are grouped

[Carlos Garnacho <carlosg src gnome org>]

commit edf69e448243f612ce4b4353e1cd9b828ea48202
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Dec 5 15:52:32 2019 +0100

    common: Add GsdDevice API to tell whether 2 devices are grouped
    
    This will be used for pad devices, better than the current way of
    comparing name strings coming from libwacom.
    
    https://gitlab.gnome.org/GNOME/gnome-control-center/issues/415

 panels/common/gsd-device-manager.c | 40 ++++++++++++++++++++++++++++++++++++--
 panels/common/gsd-device-manager.h |  2 ++
 2 files changed, 40 insertions(+), 2 deletions(-)
---
diff --git a/panels/common/gsd-device-manager.c b/panels/common/gsd-device-manager.c
index 8264e6454..9509b3fdd 100644
--- a/panels/common/gsd-device-manager.c
+++ b/panels/common/gsd-device-manager.c
@@ -42,6 +42,7 @@ typedef struct
        gchar *device_file;
        gchar *vendor_id;
        gchar *product_id;
+       gchar *group;
        GsdDeviceType type;
        guint width;
        guint height;
@@ -63,7 +64,8 @@ enum {
        PROP_PRODUCT_ID,
        PROP_TYPE,
        PROP_WIDTH,
-       PROP_HEIGHT
+       PROP_HEIGHT,
+       PROP_GROUP
 };
 
 enum {
@@ -124,6 +126,9 @@ gsd_device_set_property (GObject      *object,
        case PROP_HEIGHT:
                priv->height = g_value_get_uint (value);
                break;
+       case PROP_GROUP:
+               priv->group = g_value_dup_string (value);
+               break;
        default:
                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
                break;
@@ -162,6 +167,9 @@ gsd_device_get_property (GObject    *object,
        case PROP_HEIGHT:
                g_value_set_uint (value, priv->height);
                break;
+       case PROP_GROUP:
+               g_value_set_string (value, priv->group);
+               break;
        default:
                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
                break;
@@ -179,6 +187,7 @@ gsd_device_finalize (GObject *object)
        g_free (priv->vendor_id);
        g_free (priv->product_id);
        g_free (priv->device_file);
+       g_free (priv->group);
 
        G_OBJECT_CLASS (gsd_device_parent_class)->finalize (object);
 }
@@ -248,6 +257,14 @@ gsd_device_class_init (GsdDeviceClass *klass)
                                                            0, G_MAXUINT, 0,
                                                            G_PARAM_READWRITE |
                                                            G_PARAM_CONSTRUCT_ONLY));
+       g_object_class_install_property (object_class,
+                                        PROP_GROUP,
+                                        g_param_spec_string ("group",
+                                                             "Group",
+                                                             "Group",
+                                                             NULL,
+                                                             G_PARAM_READWRITE |
+                                                             G_PARAM_CONSTRUCT_ONLY));
 }
 
 static void
@@ -385,7 +402,7 @@ device_is_evdev (GUdevDevice *device)
 static GsdDevice *
 create_device (GUdevDevice *udev_device)
 {
-       const gchar *vendor, *product, *name;
+       const gchar *vendor, *product, *name, *group;
        guint width, height;
        g_autoptr(GUdevDevice) parent = NULL;
 
@@ -404,6 +421,8 @@ create_device (GUdevDevice *udev_device)
        width = g_udev_device_get_property_as_int (udev_device, "ID_INPUT_WIDTH_MM");
        height = g_udev_device_get_property_as_int (udev_device, "ID_INPUT_HEIGHT_MM");
 
+       group = g_udev_device_get_property (udev_device, "LIBINPUT_DEVICE_GROUP");
+
        return g_object_new (GSD_TYPE_DEVICE,
                             "name", name,
                             "device-file", g_udev_device_get_device_file (udev_device),
@@ -412,6 +431,7 @@ create_device (GUdevDevice *udev_device)
                             "product-id", product,
                             "width", width,
                             "height", height,
+                            "group", group,
                             NULL);
 }
 
@@ -654,3 +674,19 @@ gsd_device_manager_lookup_gdk_device (GsdDeviceManager *manager,
 
        return klass->lookup_device (manager, gdk_device);
 }
+
+gboolean
+gsd_device_shares_group (GsdDevice *device1,
+                        GsdDevice *device2)
+{
+       GsdDevicePrivate *priv1, *priv2;
+
+       priv1 = gsd_device_get_instance_private (GSD_DEVICE (device1));
+       priv2 = gsd_device_get_instance_private (GSD_DEVICE (device2));
+
+       /* Don't group NULLs together */
+       if (!priv1->group && !priv2->group)
+               return FALSE;
+
+       return g_strcmp0 (priv1->group, priv2->group) == 0;
+}
diff --git a/panels/common/gsd-device-manager.h b/panels/common/gsd-device-manager.h
index 13cf226a0..f48b5ad2c 100644
--- a/panels/common/gsd-device-manager.h
+++ b/panels/common/gsd-device-manager.h
@@ -80,5 +80,7 @@ gboolean         gsd_device_get_dimensions  (GsdDevice  *device,
 
 GsdDevice *       gsd_device_manager_lookup_gdk_device (GsdDeviceManager *manager,
                                                         GdkDevice        *gdk_device);
+gboolean          gsd_device_shares_group (GsdDevice *device1,
+                                           GsdDevice *device2);
 
 G_END_DECLS