tree.go

/// +build ignore

package main

import (
	"log"

	ui "github.com/gizak/termui/v3"
	"github.com/gizak/termui/v3/widgets"
)

type nodeValue string

func (nv nodeValue) String() string {
	return string(nv)
}

func main() {
	if err := ui.Init(); err != nil {
		log.Fatalf("failed to initialize termui: %v", err)
	}
	defer ui.Close()

	nodes := []*widgets.TreeNode{
		{
			Value: nodeValue("Key 1"),
			Nodes: []*widgets.TreeNode{
				{
					Value: nodeValue("Key 1.1"),
					Nodes: []*widgets.TreeNode{
						{
							Value: nodeValue("Key 1.1.1"),
							Nodes: nil,
						},
						{
							Value: nodeValue("Key 1.1.2"),
							Nodes: nil,
						},
					},
				},
				{
					Value: nodeValue("Key 1.2"),
					Nodes: nil,
				},
			},
		},
		{
			Value: nodeValue("Key 2"),
			Nodes: []*widgets.TreeNode{
				{
					Value: nodeValue("Key 2.1"),
					Nodes: nil,
				},
				{
					Value: nodeValue("Key 2.2"),
					Nodes: nil,
				},
				{
					Value: nodeValue("Key 2.3"),
					Nodes: nil,
				},
			},
		},
		{
			Value: nodeValue("Key 3"),
			Nodes: nil,
		},
	}

	l := widgets.NewTree()
	l.TextStyle = ui.NewStyle(ui.ColorYellow)
	l.WrapText = false
	l.SetNodes(nodes)

	x, y := ui.TerminalDimensions()

	l.SetRect(0, 0, x, y)

	ui.Render(l)

	previousKey := ""
	uiEvents := ui.PollEvents()
	for {
		e := <-uiEvents
		switch e.ID {
		case "q", "<C-c>":
			return
		case "j", "<Down>":
			l.ScrollDown()
		case "k", "<Up>":
			l.ScrollUp()
		case "<C-d>":
			l.ScrollHalfPageDown()
		case "<C-u>":
			l.ScrollHalfPageUp()
		case "<C-f>":
			l.ScrollPageDown()
		case "<C-b>":
			l.ScrollPageUp()
		case "g":
			if previousKey == "g" {
				l.ScrollTop()
			}
		case "<Home>":
			l.ScrollTop()
		case "<Enter>":
			l.ToggleExpand()
		case "G", "<End>":
			l.ScrollBottom()
		case "E":
			l.ExpandAll()
		case "C":
			l.CollapseAll()
		case "<Resize>":
			x, y := ui.TerminalDimensions()
			l.SetRect(0, 0, x, y)
		}

		if previousKey == "g" {
			previousKey = ""
		} else {
			previousKey = e.ID
		}

		ui.Render(l)
	}
}