Modularize the panel

[klange]

In ToaruOS 1.2.x, the panel was a Python application and offered a lot of extensibility - it was even used with a different set of widgets on the login screen.

During the NIH project, the Python panel was obviously dropped. It was replaced with a rebuilt version of the original C panel. Eventually it got most of the same functionality of the Python version, but without the modular design that went into the Python implementation.

There are two approaches that could be taken here:

• Write a new panel in Kuroko (eg. by porting the Python one, or starting from scratch).
• Keep the C panel but move widgets out to shared library plugins.

As alt-tab switching lives in the panel, I think it's best to maintain the performance the C version has offered.

The current set of widgets is:

• Applications menu
  • Left-aligned, fixed width, should own the application menu.
  • Application menu probably needs to be rewritten to support reloading better?
• Window list
  • Spans the available space in the middle.
  • Dynamic menus.
  • Needs access to window data, which still needs to live in the core panel for the alt-tab switcher?
• Volume control
  • Simple icon on panel.
  • Menu with a custom widget (... that probably should be broken out / supported directly in the menu lib)
• Network status
  • Simple icon on panel.
  • Simple menu.
• Weather
  • Icon with text on panel.
  • Complicated by standard menu.
• Date
  • Text on panel.
  • Custom menu widget.
• Time
  • Text on panel.
  • Custom menu widget that needs to update often.
• Log out menu
  • Simple icon.
  • Simple menu.

Other considerations:

• Widgets should be individually configurable.
  • Date format, time format
  • Weather configuration (units, location)
• Widget order (and existence) should be controllable
• Multiple instances of a widget?
• Providing theme data:
  • Fonts
  • Highlight colors