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add a value-changed signal so that subclasses can precalculate stuff after a value has been changed

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Original commit message from CVS:
add a value-changed signal so that subclasses can precalculate stuff after a value has been changed
This commit is contained in:
Steve Baker 2002-05-29 18:45:25 +00:00
parent 52af47c5e4
commit e1fe257bc9
2 changed files with 19 additions and 4 deletions
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22
libs/gst/control/dparam.c
View file

@ -39,6 +39,13 @@ enum {
ARG_VALUE_INT64,
};
enum {
VALUE_CHANGED,
LAST_SIGNAL
};
static guint gst_dparam_signals[LAST_SIGNAL] = { 0 };
GType
gst_dparam_get_type(void) {
static GType dparam_type = 0;
@ -89,6 +96,10 @@ gst_dparam_class_init (GstDParamClass *klass)
gobject_class->dispose = gst_dparam_dispose;
gst_dparam_signals[VALUE_CHANGED] =
g_signal_new ("value_changed", G_TYPE_FROM_CLASS(klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDParamClass, value_changed), NULL, NULL,
gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
/*gstobject_class->save_thyself = gst_dparam_save_thyself; */
}
@ -150,27 +161,30 @@ gst_dparam_set_property (GObject *object, guint prop_id, const GValue *value, GP
case ARG_VALUE_FLOAT:
GST_DEBUG(GST_CAT_PARAMS, "setting value from %f to %f", dparam->value_float, g_value_get_float (value));
dparam->value_float = g_value_get_float (value);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
break;
case ARG_VALUE_INT:
GST_DEBUG(GST_CAT_PARAMS, "setting value from %d to %d", dparam->value_int, g_value_get_int (value));
dparam->value_int = g_value_get_int (value);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
break;
case ARG_VALUE_INT64:
GST_DEBUG(GST_CAT_PARAMS, "setting value from %lld to %lld", dparam->value_int64, g_value_get_int64 (value));
dparam->value_int64 = g_value_get_int (value);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam);
GST_DPARAM_READY_FOR_UPDATE(dparam) = TRUE;
break;
default:
break;
}
/* note that this signal is sent while we still have the lock. */
g_signal_emit (G_OBJECT (dparam), gst_dparam_signals[VALUE_CHANGED], 0);
GST_DPARAM_UNLOCK(dparam);
}
@ -199,9 +213,9 @@ gst_dparam_do_update_default (GstDParam *dparam, gint64 timestamp, GValue *value
break;
}
GST_DPARAM_READY_FOR_UPDATE(dparam) = FALSE;
GST_DPARAM_LAST_UPDATE_TIMESTAMP(dparam) = timestamp;
GST_DPARAM_NEXT_UPDATE_TIMESTAMP(dparam) = timestamp;
GST_DPARAM_READY_FOR_UPDATE(dparam) = FALSE;
GST_DPARAM_UNLOCK(dparam);
}

1
libs/gst/control/dparam.h
View file

@ -92,6 +92,7 @@ struct _GstDParamClass {
GstObjectClass parent_class;
/* signal callbacks */
void (*value_changed) (GstDParam *dparam);
};