on_toggle_iconification

The on_toggle_iconification method defines callback behavior that is triggered when a window's "iconification" is toggled. This occurs either when a Window is iconified or restored. It generates a CrystGLFW::Event::WindowToggleIconification that is yielded to the block:

window = Window.new

window.on_toggle_iconification do |event|
  if event.iconified?
    puts "Window is iconified!"
  else
    puts "Window is restored!"
  end
end

With this callback defined, every time the iconification of window is toggled, it prints whether or not it is iconified to standard output.

on_toggle_iconification must be called from within a run block definition.