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triggerbox: keep track of, and make available, "empty" status for a triggerbox.

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Includes PBD::Signal that notifies when a TriggerBox's empty status changes
This commit is contained in:
Paul Davis 2022-01-31 22:40:05 -07:00
parent b55ef8543d
commit 8e4fdb071b
2 changed files with 30 additions and 0 deletions
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4
libs/ardour/ardour/triggerbox.h
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@ -590,6 +590,9 @@ class LIBARDOUR_API TriggerBox : public Processor
bool can_support_io_configuration (const ChanCount& in, ChanCount& out); bool can_support_io_configuration (const ChanCount& in, ChanCount& out);
bool configure_io (ChanCount in, ChanCount out); bool configure_io (ChanCount in, ChanCount out);
bool empty() const { return _active_slots == 0; }
PBD::Signal0<void> EmptyStatusChanged;
int32_t order() const { return _order; } int32_t order() const { return _order; }
void set_order(int32_t n); void set_order(int32_t n);
@ -690,6 +693,7 @@ class LIBARDOUR_API TriggerBox : public Processor
Requests _requests; Requests _requests;
bool _stop_all; bool _stop_all;
int32_t _active_scene; int32_t _active_scene;
int32_t _active_slots;
boost::shared_ptr<SideChain> _sidechain; boost::shared_ptr<SideChain> _sidechain;

26
libs/ardour/triggerbox.cc
View file

@ -2124,6 +2124,7 @@ TriggerBox::TriggerBox (Session& s, DataType dt)
, _currently_playing (0) , _currently_playing (0)
, _stop_all (false) , _stop_all (false)
, _active_scene (-1) , _active_scene (-1)
, _active_slots (0)
, requests (1024) , requests (1024)
{ {
set_display_to_user (false); set_display_to_user (false);
@ -2220,14 +2221,29 @@ TriggerBox::maybe_swap_pending (uint32_t slot)
*/ */
Trigger* p = 0; Trigger* p = 0;
bool empty_changed = false;
p = all_triggers[slot]->swap_pending (p); p = all_triggers[slot]->swap_pending (p);
if (p) { if (p) {
if (p == Trigger::MagicClearPointerValue) { if (p == Trigger::MagicClearPointerValue) {
if (all_triggers[slot]->region()) {
if (_active_slots) {
_active_slots--;
}
if (_active_slots == 0) {
empty_changed = true;
}
}
all_triggers[slot]->clear_region (); all_triggers[slot]->clear_region ();
} else { } else {
if (!all_triggers[slot]->region()) {
if (_active_slots == 0) {
empty_changed = true;
}
_active_slots++;
}
/* Note use of a custom delete function. We cannot /* Note use of a custom delete function. We cannot
delete the old trigger from the RT context where the delete the old trigger from the RT context where the
trigger swap will happen, so we will ask the trigger trigger swap will happen, so we will ask the trigger
@ -2237,6 +2253,10 @@ TriggerBox::maybe_swap_pending (uint32_t slot)
TriggerSwapped (slot); /* EMIT SIGNAL */ TriggerSwapped (slot); /* EMIT SIGNAL */
} }
} }
if (empty_changed) {
EmptyStatusChanged (); /* EMIT SIGNAL */
}
} }
void void
@ -3157,6 +3177,7 @@ TriggerBox::set_state (const XMLNode& node, int version)
all_triggers.push_back (trig); all_triggers.push_back (trig);
trig->set_state (**t, version); trig->set_state (**t, version);
} }
_active_slots++;
} }
} }
@ -3172,6 +3193,11 @@ TriggerBox::set_state (const XMLNode& node, int version)
} }
} }
/* Since _active_slots may have changed, we could consider sending
* EmptyStatusChanged, but for now we don't consider ::set_state() to
* be used except at session load.
*/
return 0; return 0;
} }