Grid Layout

WTF uses the Grid layout system from tview to position widgets onscreen. It's not immediately obvious how this works, so here's an explanation:

Think of your terminal screen as a matrix of letter positions, say 100 chrs wide and 58 chrs tall.

Columns breaks up the width of the screen into chunks, each chunk a specified number of characters wide. use

[10, 10, 10, 10, 10, 10, 10, 10, 10, 10]

Ten columns that are ten characters wide

Rows break up the height of the screen into chunks, each chunk a specified number of characters tall. If we wanted to have five rows:

[10, 10, 10, 10, 18]

The co-ordinate system starts at top-left and defines how wide and tall a widget is. If we wanted to put a 2-col, 2-row widget in the bottom of the screen, we'd position it at:

  top:    4  // top starts in the 4th row
  left:   9  // left starts in the 9th column
  height: 2  // span down rows 4 & 5 (18 characters in size, total)
  width:  2  // span across cols 9 & 10 (20 characters in size, total)