GUI

Nanogui based graphical user interface.

General:

• Do not modify gui outside gui thread (main). Modifications must be done in GUI callbacks or draw().
• Expensive processing should be moved out of gui thread (draw() and callbacks)
• Module is only required to implement Module. Each module is expected to be loaded only once.

Classes

Screen

• Implements main screen: toolbar and view
• Interface for registering new modules.
• Interface for adding/removing buttons
• Interface for setting active View. Inactive view is removed and destroyed if no other references are remaining.
• Note: toolbar could be a module, but other modules likely assume it is always available anyways.
• Centralized access to Nanogui::Themes and custom non-theme colors.

Module (controller)

• GUI module class wraps pointers for io, config and net. Initialization should add necessary buttons to Screen
• Build necessary callbacks to process data from InputOutput to view. Note: If callback passes data to view, callback handle should be owned by the view or Module has to keep a nanogui reference to the View. Also note that View destructor is called when active view is replaced.

View

• Active view will be the main window; only one view can be active at time
• Button callbacks (eg. those registered by module init) may change active view
• Destroyed when view is changed. Object lifetime can be used to remove callbacks from InputOutput (TODO: only one active callback supported at the moment)
• Implementations do not have to inherit from View. Popup/Window/Widget... can be used to implement UI components available from any mode (config, record).
• Receives all unprocessed keyboard events.

InputOutput

• Contains pointers to all required FTL objects (network/rendering/feed/...).
• Speaker

NanoGUI notes:

• If disposing Window in widget destructor, window->parent() reference count must be checked and dispose() only called if refCount > 0. (segfault at exit)
• Nanogui does not dispose popup windows automatically. See above point if using destructor for clean up.