Development update (September 8)

Finally a commit with some major new feature: Piano roll tracks.

What's new

Piano roll tracks

This isn't exactly an distinguishing feature of noisicaä (as the score tracks would be), but a pretty standard feature of a DAW, so it's good to have.

For now I just implemented the most basic editing features to make it useful. There's no editing of CC events, no recording, no importing of MIDI files. One editing feature, which I would consider "basic", is still missing though: copy & paste. There is some clipboard support in other track types, but I'm not happy with it, so I didn't want to add more cruft to that. The next thing I want to tackle is a proper design of the copy & paste system, which should be ready for current and future use cases.

Some minor UI tweaks

• The position of the splitter between the track list and the graph canvas is now persisted.
• The track list stays centered when changing the time scale (ctrl-left and ctrl-right - hmm... that's pretty well hidden...).

Internal changes

• Tracks are now QWidgets, which simplifies the UI event handling and allows to use the existing PianoRoll widget to be used for the MIDI segments.
• Extended the existing PianoRoll widget (as introduced for the MIDI Looper node) to support editing and multiple MIDI channels.
• The existing PianoRollProcessor has been extended to handle multiple segments, so it can be used by the new PianoRollTrack, while keeping compatibility with existing uses by ScoreTrack and BeatTrack.
• The tool-based UI event handling has been streamlined.
• I switched to using QActions with shortcuts, instead of explicit keyboard event handling, to trigger keyboard shortcuts (after I figured out how to make that work properly).