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Add default deep_notify and error signal callbacks to core.

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Original commit message from CVS:
Add default deep_notify and error signal callbacks to core.
This commit is contained in:
Wim Taymans 2002-07-30 19:17:25 +00:00
parent af8689298f
commit 67b8fe63cf
2 changed files with 68 additions and 0 deletions
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65
gst/gstelement.c
View file

@ -245,6 +245,71 @@ gst_element_dispatch_properties_changed (GObject *object,
}
}
/**
* gst_element_default_deep_notify:
* @object: the object that signalled the notify
* @orig: the object that intiated the notify
* @psepc: the paramspec of the property
* @excluded_props: user specified properties to exclude
*
* A default deep_notify signal callback that can be added to an
* element. The user data should contain a pointer to an array of
* strings that should be excluded from the notify.
* The default handler will print the new value of the property
* using g_print.
*/
void
gst_element_default_deep_notify (GObject *object, GstObject *orig, GParamSpec *pspec, gchar **excluded_props)
{
GValue value = { 0, }; /* the important thing is that value.type = 0 */
gchar *str = 0;
if (pspec->flags & G_PARAM_READABLE) {
/* let's not print these out for excluded properties... */
while (excluded_props != NULL && *excluded_props != NULL) {
if (strcmp (pspec->name, *excluded_props) == 0)
return;
excluded_props++;
}
g_value_init(&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
g_object_get_property (G_OBJECT (orig), pspec->name, &value);
if (G_IS_PARAM_SPEC_ENUM (pspec)) {
GEnumValue *enum_value;
enum_value = g_enum_get_value (G_ENUM_CLASS (g_type_class_ref (pspec->value_type)),
g_value_get_enum (&value));
str = g_strdup_printf ("%s (%d)", enum_value->value_nick, enum_value->value);
}
else {
str = g_strdup_value_contents (&value);
}
g_print ("%s: %s = %s\n", GST_OBJECT_NAME (orig), pspec->name, str);
g_free (str);
g_value_unset(&value);
} else {
g_warning ("Parameter %s not readable in %s.", pspec->name, GST_OBJECT_NAME (orig));
}
}
/**
* gst_element_default_error:
* @object: the object that signalled the error
* @orig: the object that intiated the error
* @error: the error message
*
* A default error signal callback that can be added to an
* element. The user data passed to the g_signal_connect is
* ignored.
* The default handler will smply print the error string
* using g_print.
*/
void
gst_element_default_error (GObject *object, GstObject *orig, gchar *error)
{
g_print ("ERROR: %s: %s\n", GST_OBJECT_NAME (orig), error);
}
typedef struct {
const GParamSpec *pspec;
const GValue *value;

3
gst/gstelement.h
View file

@ -182,6 +182,9 @@ void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplat
void gst_element_class_install_std_props (GstElementClass *klass,
const gchar *first_name, ...);
void gst_element_default_deep_notify (GObject *object, GstObject *orig,
GParamSpec *pspec, gchar **excluded_props);
void gst_element_default_error (GObject *object, GstObject *orig, gchar *error);
GType gst_element_get_type (void);
#define gst_element_destroy(element) gst_object_destroy (GST_OBJECT (element))