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fix ever increasing MIDI event IDs

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Iterating over a const Midi-Sequence calls Evoral::Sequence::set_event(),
which in turn used Evoral::Event::operator=()  which always created
a new event-ID (create copy of the event).

Issues fixed:
 - Saving *unmodified* MIDI produced new event-IDs on every save;
   files changed with every save. - greetings to Deva.
 - all [GUI] operations that use IDs to refer to notes e.g. undo.
   invalid undo-history.

Also clarify assignment operator name. Prefer explicit assign() over =.
This commit is contained in:
Robin Gareus
2015-09-18 17:34:12 +02:00
parent c12e8cc47c
commit 8b2fb88f15
3 changed files with 18 additions and 19 deletions
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8
libs/evoral/src/Sequence.cpp
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@@ -284,18 +284,18 @@ Sequence<Time>::const_iterator::set_event()
switch (_type) {
case NOTE_ON:
DEBUG_TRACE(DEBUG::Sequence, "iterator = note on\n");
*_event = (*_note_iter)->on_event();
_event->assign ((*_note_iter)->on_event());
_active_notes.push(*_note_iter);
break;
case NOTE_OFF:
DEBUG_TRACE(DEBUG::Sequence, "iterator = note off\n");
assert(!_active_notes.empty());
*_event = _active_notes.top()->off_event();
_event->assign (_active_notes.top()->off_event());
// We don't pop the active note until we increment past it
break;
case SYSEX:
DEBUG_TRACE(DEBUG::Sequence, "iterator = sysex\n");
*_event = *(*_sysex_iter);
_event->assign (*(*_sysex_iter));
break;
case CONTROL:
DEBUG_TRACE(DEBUG::Sequence, "iterator = control\n");
@@ -303,7 +303,7 @@ Sequence<Time>::const_iterator::set_event()
break;
case PATCH_CHANGE:
DEBUG_TRACE(DEBUG::Sequence, "iterator = program change\n");
*_event = (*_patch_change_iter)->message (_active_patch_change_message);
_event->assign ((*_patch_change_iter)->message (_active_patch_change_message));
break;
default:
_is_end = true;