Sets our main struct and passes it to the parent class.
A destructor is present on this object, but not explicitly documented in the source.
Get the main Gtk struct
the main Gtk struct as a void*
height of the rectangle.
width of the rectangle.
X coordinate of the left side of the rectangle.
Y coordinate of the top side of the rectangle.
the main Gtk struct
A data structure for holding a rectangle. Those coordinates are relative to the component top-level parent.