Terminal-based user interface toolkit
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package main
import (
"fmt"
"strings"
"code.rocketnine.space/tslocum/cview"
"github.com/gdamore/tcell/v2"
)
const logo = `
======= === === === ======== === === ===
=== === === === === === === ===
=== === === === ====== === === ===
=== ====== === === ===========
======= == === ======== ==== ====
`
const (
subtitle = `Terminal-based user interface toolkit`
mouse = `Navigate with your keyboard or mouse.`
navigation = `Next slide: Ctrl-N Previous: Ctrl-P Exit: Ctrl-C`
)
// Cover returns the cover page.
func Cover(nextSlide func()) (title string, content cview.Primitive) {
// What's the size of the logo?
lines := strings.Split(logo, "\n")
logoWidth := 0
logoHeight := len(lines)
for _, line := range lines {
if len(line) > logoWidth {
logoWidth = len(line)
}
}
logoBox := cview.NewTextView()
logoBox.SetTextColor(tcell.ColorGreen.TrueColor())
logoBox.SetDoneFunc(func(key tcell.Key) {
nextSlide()
})
fmt.Fprint(logoBox, logo)
// Create a frame for the subtitle and navigation infos.
frame := cview.NewFrame(cview.NewBox())
frame.SetBorders(0, 0, 0, 0, 0, 0)
frame.AddText(subtitle, true, cview.AlignCenter, tcell.ColorWhite.TrueColor())
frame.AddText("", true, cview.AlignCenter, tcell.ColorWhite.TrueColor())
frame.AddText(mouse, true, cview.AlignCenter, tcell.ColorDarkMagenta.TrueColor())
frame.AddText(navigation, true, cview.AlignCenter, tcell.ColorDarkMagenta.TrueColor())
// Create a Flex layout that centers the logo and subtitle.
subFlex := cview.NewFlex()
subFlex.AddItem(cview.NewBox(), 0, 1, false)
subFlex.AddItem(logoBox, logoWidth, 1, true)
subFlex.AddItem(cview.NewBox(), 0, 1, false)
flex := cview.NewFlex()
flex.SetDirection(cview.FlexRow)
flex.AddItem(cview.NewBox(), 0, 7, false)
flex.AddItem(subFlex, logoHeight, 1, true)
flex.AddItem(frame, 0, 10, false)
return "Start", flex
}