restore last used driver+devices for a given backend.

diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index 5e7d4f5a3ea956737843867463a88d5a81579162..d8f35b211aa25ea8895daeed12bd42d074bfd629 100644 (file)
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -1021,6 +1021,15 @@ EngineControl::backend_changed ()
                set_active_text_if_present (buffer_size_combo, bufsize_as_string (backend->buffer_size()));
        }
 
+       if (_have_control && !ignore_changes) {
+               // set driver & devices
+               State state = get_matching_state (backend_combo.get_active_text());
+               if (state) {
+                       PBD::Unwinder<uint32_t> protect_ignore_changes (ignore_changes, ignore_changes + 1);
+                       set_current_state (state);
+               }
+       }
+
        if (!ignore_changes) {
                maybe_display_saved_state ();
        }
@@ -1270,6 +1279,8 @@ EngineControl::driver_changed ()
        backend->set_driver (driver_combo.get_active_text());
        list_devices ();
 
+       // TODO load LRU device(s) for backend + driver combo
+
        if (!ignore_changes) {
                maybe_display_saved_state ();
        }
@@ -1615,6 +1626,19 @@ EngineControl::parameter_changed ()
 {
 }
 
+EngineControl::State
+EngineControl::get_matching_state (const string& backend)
+{
+       for (StateList::iterator i = states.begin(); i != states.end(); ++i) {
+               // TODO use LRU for every backend and prefer the active one
+               // uniqueness is only guaranteed for backend + driver + device(s)
+               if ((*i)->backend == backend) {
+                       return (*i);
+               }
+       }
+       return State();
+}
+
 EngineControl::State
 EngineControl::get_matching_state (
                const string& backend,

diff --git a/gtk2_ardour/engine_dialog.h b/gtk2_ardour/engine_dialog.h
index 39ae276162edcf6164e772f1150875ab5603866a..ae2128b19be5e15dfa14a910e51b2ef5090a8940 100644 (file)
--- a/gtk2_ardour/engine_dialog.h
+++ b/gtk2_ardour/engine_dialog.h
@@ -234,6 +234,7 @@ class EngineControl : public ArdourDialog, public PBD::ScopedConnectionList {
 
     StateList states;
 
+    State get_matching_state (const std::string& backend);
     State get_matching_state (const std::string& backend,
                               const std::string& driver,
                               const std::string& device);