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provide a mechanism to force ID regeneration/reset in PBD::Stateful when settingthe ID object from XML or string sources

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This commit is contained in:
Paul Davis 2015-11-12 10:24:41 -05:00
parent 487a2563a6
commit 92fe47bdee
2 changed files with 35 additions and 2 deletions
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16
libs/pbd/pbd/stateful.h
View File

@ -70,6 +70,17 @@ class LIBPBD_API Stateful {
void set_id (const std::string&);
void reset_id ();
/* RAII structure to manage thread-local ID regeneration.
*/
struct ForceIDRegeneration {
ForceIDRegeneration () {
set_regenerate_xml_and_string_ids_in_this_thread (true);
}
~ForceIDRegeneration () {
set_regenerate_xml_and_string_ids_in_this_thread (false);
}
};
/* history management */
void clear_changes ();
@ -121,11 +132,14 @@ class LIBPBD_API Stateful {
virtual void mid_thaw (const PropertyChange&) { }
private:
friend struct ForceIDRegeneration;
static Glib::Threads::Private<bool> regenerate_xml_or_string_ids;
PBD::ID _id;
gint _stateful_frozen;
static void set_regenerate_xml_and_string_ids_in_this_thread (bool yn);
};
} // namespace PBD
#endif /* __pbd_stateful_h__ */

19
libs/pbd/stateful.cc
View File

@ -44,6 +44,10 @@ namespace PBD {
int Stateful::current_state_version = 0;
int Stateful::loading_state_version = 0;
static void do_not_delete (void*) { }
Glib::Threads::Private<bool> Stateful::regenerate_xml_or_string_ids (do_not_delete);
Stateful::Stateful ()
: _extra_xml (0)
, _instant_xml (0)
@ -382,6 +386,11 @@ Stateful::set_id (const XMLNode& node)
{
const XMLProperty* prop;
if (regenerate_xml_or_string_ids.get()) {
reset_id ();
return true;
}
if ((prop = node.property ("id")) != 0) {
_id = prop->value ();
return true;
@ -399,7 +408,17 @@ Stateful::reset_id ()
void
Stateful::set_id (const string& str)
{
if (regenerate_xml_or_string_ids.get()) {
reset_id ();
} else {
_id = str;
}
}
void
Stateful::set_regenerate_xml_and_string_ids_in_this_thread (bool yn)
{
regenerate_xml_or_string_ids.set (&yn);
}
} // namespace PBD