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fp-image-device: Use a GObject signal to notify image state changed

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This is more GObject-friendly and we have the automatic call of the vfunc if
one is set.
This commit is contained in:
Marco Trevisan (Treviño) 2019-11-22 14:50:48 +01:00
parent be367988ae
commit cca6d3b04b
1 changed files with 17 additions and 6 deletions
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23
libfprint/fp-image-device.c
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@ -69,6 +69,14 @@ enum {
static GParamSpec *properties[N_PROPS];
enum {
FPI_STATE_CHANGED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
/*******************************************************/
/* TODO:
@ -81,7 +89,6 @@ static void
fp_image_device_change_state (FpImageDevice *self, FpImageDeviceState state)
{
FpImageDevicePrivate *priv = fp_image_device_get_instance_private (self);
FpImageDeviceClass *cls = FP_IMAGE_DEVICE_GET_CLASS (self);
/* Cannot change to inactive using this function. */
g_assert (state != FP_IMAGE_DEVICE_STATE_INACTIVE);
@ -94,11 +101,7 @@ fp_image_device_change_state (FpImageDevice *self, FpImageDeviceState state)
priv->state = state;
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_FPI_STATE]);
/* change_state is the only callback which is optional and does not
* have a default implementation. */
if (cls->change_state)
cls->change_state (self, state);
g_signal_emit (self, signals[FPI_STATE_CHANGED], 0, priv->state);
}
static void
@ -356,6 +359,14 @@ fp_image_device_class_init (FpImageDeviceClass *klass)
FP_IMAGE_DEVICE_STATE_INACTIVE,
G_PARAM_STATIC_STRINGS | G_PARAM_READABLE);
signals[FPI_STATE_CHANGED] =
g_signal_new ("fp-image-device-state-changed",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (FpImageDeviceClass, change_state),
NULL, NULL, NULL,
G_TYPE_NONE, 1, FP_TYPE_IMAGE_DEVICE_STATE);
g_object_class_install_properties (object_class, N_PROPS, properties);
}