Method
GtkExpressionwatch
Declaration [src]
GtkExpressionWatch*
gtk_expression_watch (
GtkExpression* self,
GObject* this_,
GtkExpressionNotify notify,
gpointer user_data,
GDestroyNotify user_destroy
)
Description [src]
Watch the given expression
for changes.
The notify
function will be called whenever the evaluation of self
may have changed.
GTK cannot guarantee that the evaluation did indeed change when the notify
gets invoked, but it guarantees the opposite: When it did in fact change,
the notify
will be invoked.
Parameters
this_ |
GObject |
The |
|
The argument can be NULL . | |
The data is owned by the caller of the function. | |
notify |
GtkExpressionNotify |
Callback to invoke when the expression changes. |
|
user_data |
gpointer |
User data to pass to the |
|
The argument can be NULL . | |
The data is owned by the caller of the function. | |
user_destroy |
GDestroyNotify |
Destroy notify for |
Return value
Returns: | GtkExpressionWatch |
The newly installed watch. Note that the only
reference held to the watch will be released when the watch is unwatched
which can happen automatically, and not just via
|
|
The data is owned by the instance. |