Icons

When a Window is iconified, its icon may be displayed by the operating system at its discretion.

set_icon and icon=

You can set the icon that you'd like the operating system to display using the set_icon method:

image = Image.new(16, 16, pixels)
window = Window.new
window.set_icon(image)

It is recommended that the icon's size be 16x16, 32x32, or 48x48.

If you prefer, you can use icon= to achieve the same thing:

image = Image.new(16, 16, pixels)
window = Window.new
window.icon = image

Both set_icon and icon= must be called from within a run block definition.