Grid

Grid layout:

Grid allows you to create responsive layouts which adapt to the available screen size. To see this in the example below, resize the screen. The menu and side bar elements will disappear if the screen width is less than 100 characters wide.

Code:

package main

import (
	"github.com/rivo/tview"
)

func main() {
	newPrimitive := func(text string) tview.Primitive {
		return tview.NewTextView().
			SetTextAlign(tview.AlignCenter).
			SetText(text)
	}
	menu := newPrimitive("Menu")
	main := newPrimitive("Main content")
	sideBar := newPrimitive("Side Bar")

	grid := tview.NewGrid().
		SetRows(3, 0, 3).
		SetColumns(30, 0, 30).
		SetBorders(true).
		AddItem(newPrimitive("Header"), 0, 0, 1, 3, 0, 0, false).
		AddItem(newPrimitive("Footer"), 2, 0, 1, 3, 0, 0, false)

	// Layout for screens narrower than 100 cells (menu and side bar are hidden).
	grid.AddItem(menu, 0, 0, 0, 0, 0, 0, false).
		AddItem(main, 1, 0, 1, 3, 0, 0, false).
		AddItem(sideBar, 0, 0, 0, 0, 0, 0, false)

	// Layout for screens wider than 100 cells.
	grid.AddItem(menu, 1, 0, 1, 1, 0, 100, false).
		AddItem(main, 1, 1, 1, 1, 0, 100, false).
		AddItem(sideBar, 1, 2, 1, 1, 0, 100, false)

	if err := tview.NewApplication().SetRoot(grid, true).SetFocus(grid).Run(); err != nil {
		panic(err)
	}
}