ctop/grid.go

package main

import (
	"sort"

	ui "github.com/gizak/termui"
)

type Grid struct {
	containers map[string]*Container
}

func (g *Grid) AddContainer(id string) {
	cid := ui.NewPar(id)
	cid.Border = false
	cid.Height = 2
	cid.Width = 10
	cid.TextFgColor = ui.ColorWhite
	g.containers[id] = &Container{cid, mkGauge(), mkGauge()}
}

// Return sorted list of active container IDs
func (g *Grid) CIDs() []string {
	var ids []string
	for id, _ := range g.containers {
		ids = append(ids, id)
	}
	sort.Strings(ids)
	return ids
}

func (g *Grid) Rows() (rows []*ui.Row) {
	for _, cid := range g.CIDs() {
		c := g.containers[cid]
		rows = append(rows, ui.NewRow(
			ui.NewCol(1, 0, c.cid),
			ui.NewCol(2, 0, c.cpu),
			ui.NewCol(2, 0, c.memory),
		))
	}
	return rows
}

func mkGauge() *ui.Gauge {
	g := ui.NewGauge()
	g.Height = 1
	g.Border = false
	g.Percent = 5
	g.PaddingBottom = 0
	g.BarColor = ui.ColorGreen
	return g
}

func header() *ui.Row {
	//cid
	c1 := ui.NewPar(" CID")
	c1.Border = false
	c1.Height = 2
	c1.Width = 10
	c1.TextFgColor = ui.ColorWhite

	//cpu
	c2 := ui.NewPar(" CPU")
	c2.Border = false
	c2.Height = 2
	c2.Width = 10
	c2.TextFgColor = ui.ColorWhite

	//mem
	c3 := ui.NewPar(" MEM")
	c3.Border = false
	c3.Height = 2
	c3.Width = 10
	c3.TextFgColor = ui.ColorWhite

	//misc
	c4 := ui.NewPar(" MISC")
	c4.Border = false
	c4.Height = 2
	c4.Width = 10
	c4.TextFgColor = ui.ColorWhite
	return ui.NewRow(
		ui.NewCol(1, 0, c1),
		ui.NewCol(2, 0, c2),
		ui.NewCol(2, 0, c3),
		ui.NewCol(2, 0, c4),
	)
}

func NewGrid() {
	if err := ui.Init(); err != nil {
		panic(err)
	}
	defer ui.Close()

	g := &Grid{make(map[string]*Container)}
	for _, id := range []string{" 12345", " 56789", " 00001"} {
		g.AddContainer(id)
	}

	par := ui.NewPar("<> This row has 3 columns\n<- Widgets can be stacked up like left side\n<- Stacked widgets are treated as a single widget")
	par.Height = 5
	par.BorderLabel = "Demonstration"

	// build layout
	ui.Body.AddRows(
		header(),
	)

	for _, row := range g.Rows() {
		ui.Body.AddRows(row)
	}

	// calculate layout
	ui.Body.Align()

	ui.Render(ui.Body)

	ui.Handle("/sys/kbd/q", func(ui.Event) {
		ui.StopLoop()
	})
	ui.Handle("/timer/1s", func(e ui.Event) {
		t := e.Data.(ui.EvtTimer)
		i := t.Count
		if i > 103 {
			ui.StopLoop()
			return
		}

		for _, c := range g.containers {
			c.UpdateCPU((c.cpu.Percent + 5) % 100)
			c.UpdateMem((c.memory.Percent + 12) % 100)
		}

		ui.Render(ui.Body)
	})

	ui.Handle("/sys/wnd/resize", func(e ui.Event) {
		ui.Body.Width = ui.TermWidth()
		ui.Body.Align()
		ui.Clear()
		ui.Render(ui.Body)
	})

	ui.Loop()
}

func main() {
	NewGrid()
}