on_cursor_move

The on_cursor_move method defines callback behavior that is triggered when the system cursor is moved while a Window has input focus. It generates a CrystGLFW::Event::WindowCursorMove that is yielded to the block:

window = Window.new

window.on_cursor_move do |event|
  puts "cursor moved to #{event.position}"
end

With this callback defined, every time the cursor is moved while window has input focus, the cursor's new location (relative to window) is printed to standard output.

on_cursor_move must be called from within a run block definition.