cover.go

Documentation: github.com/rivo/tview/demos/presentation

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  	"strings"
     6  
     7  	"github.com/gdamore/tcell/v2"
     8  	"github.com/rivo/tview"
     9  )
    10  
    11  const logo = `
    12     __        _
    13    / /__   __(_)__ _      __
    14   / __/ | / / / _ \ | /| / /
    15  / /_ | |/ / /  __/ |/ |/ /
    16  \__/ |___/_/\___/|__/|__/
    17  
    18  `
    19  
    20  const (
    21  	subtitle   = `tview - Rich Widgets for Terminal UIs`
    22  	navigation = `Ctrl-N: Next slide    Ctrl-P: Previous slide    Ctrl-C: Exit`
    23  	mouse      = `(or use your mouse)`
    24  )
    25  
    26  // Cover returns the cover page.
    27  func Cover(nextSlide func()) (title string, content tview.Primitive) {
    28  	// What's the size of the logo?
    29  	lines := strings.Split(logo, "\n")
    30  	logoWidth := 0
    31  	logoHeight := len(lines)
    32  	for _, line := range lines {
    33  		if len(line) > logoWidth {
    34  			logoWidth = len(line)
    35  		}
    36  	}
    37  	logoBox := tview.NewTextView().
    38  		SetTextColor(tcell.ColorGreen).
    39  		SetDoneFunc(func(key tcell.Key) {
    40  			nextSlide()
    41  		})
    42  	fmt.Fprint(logoBox, logo)
    43  
    44  	// Create a frame for the subtitle and navigation infos.
    45  	frame := tview.NewFrame(tview.NewBox()).
    46  		SetBorders(0, 0, 0, 0, 0, 0).
    47  		AddText(subtitle, true, tview.AlignCenter, tcell.ColorWhite).
    48  		AddText("", true, tview.AlignCenter, tcell.ColorWhite).
    49  		AddText(navigation, true, tview.AlignCenter, tcell.ColorDarkMagenta).
    50  		AddText(mouse, true, tview.AlignCenter, tcell.ColorDarkMagenta)
    51  
    52  	// Create a Flex layout that centers the logo and subtitle.
    53  	flex := tview.NewFlex().
    54  		SetDirection(tview.FlexRow).
    55  		AddItem(tview.NewBox(), 0, 7, false).
    56  		AddItem(tview.NewFlex().
    57  			AddItem(tview.NewBox(), 0, 1, false).
    58  			AddItem(logoBox, logoWidth, 1, true).
    59  			AddItem(tview.NewBox(), 0, 1, false), logoHeight, 1, true).
    60  		AddItem(frame, 0, 10, false)
    61  
    62  	return "Start", flex
    63  }
    64
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