Adds a widget to the grid.
The position of @child is determined by @left and @top. The number of “cells” that @child will occupy is determined by @width and @height.
the widget to add
the column number to attach the left side of @child to
the row number to attach the top side of @child to
the number of columns that @child will span
the number of rows that @child will span
See Implementation
Adds a widget to the grid.
The position of @child is determined by @left and @top. The number of “cells” that @child will occupy is determined by @width and @height.