Show/Hide midi calibrate button based on AudioBackend::enumerate_devices

Rather than use an ifdef to only pack the button on linux just hide the button
if the backend doesn't enumerate the devices.

diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index 6abae66dda264a20622e931ff4f8c83afc4588fd..db951e73b832a0fdd4350b1289c7e01052ab579a 100644 (file)
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -263,7 +263,6 @@ EngineControl::EngineControl ()
        output_channels.signal_output().connect (sigc::bind (sigc::ptr_fun (&EngineControl::print_channel_count), &output_channels));
 
        midi_devices_button.signal_clicked.connect (mem_fun (*this, &EngineControl::configure_midi_devices));
-       midi_devices_button.set_sensitive (false);
        midi_devices_button.set_name ("generic button");
        midi_devices_button.set_can_focus(true);
 
@@ -650,13 +649,7 @@ EngineControl::build_full_control_notebook ()
        label = manage (left_aligned_label (_("MIDI System:")));
        basic_packer.attach (*label, 0, 1, row, row + 1, xopt, (AttachOptions) 0);
        basic_packer.attach (midi_option_combo, 1, 2, row, row + 1, SHRINK, (AttachOptions) 0);
-#if ! defined __APPLE__  && ! defined PLATFORM_WINDOWS // => linux, YAY
-       /* Currently the only backend with dedicated Midi setup is ALSA.
-        * lot of people complain that this is greyed out
-        * "I can't use MIDI, the setup is greyed out"
-        */
        basic_packer.attach (midi_devices_button, 3, 4, row, row+1, xopt, xopt);
-#endif
        row++;
 }
 
@@ -1676,9 +1669,9 @@ EngineControl::midi_option_changed ()
        _midi_devices = new_devices;
 
        if (_midi_devices.empty()) {
-               midi_devices_button.set_sensitive (false);
+               midi_devices_button.hide ();
        } else {
-               midi_devices_button.set_sensitive (true);
+               midi_devices_button.show ();
        }
 }