Piano: Expose multi-track functionality

This commit adds some actions for creating and cycling through tracks.

set_octave_and_ensure_note_change() was refactored to allow switching
tracks to implement the same behaviour.

KnobsWidget is getting pretty bad.

1 files changed, 3 insertions, 0 deletions

diff --git a/Applications/Piano/main.cpp b/Applications/Piano/main.cpp
index 0310a29de3..b48afdcc50 100644
--- a/Applications/Piano/main.cpp
+++ b/Applications/Piano/main.cpp
@@ -117,6 +117,9 @@ int main(int argc, char** argv)
         GUI::AboutDialog::show("Piano", Gfx::Bitmap::load_from_file("/res/icons/32x32/app-piano.png"), window);
     }));
 
+    auto& edit_menu = menubar->add_menu("Edit");
+    main_widget.add_actions(edit_menu);
+
     app.set_menubar(move(menubar));
 
     return app.exec();