Add grid layout

README.md

@@ -7,6 +7,10 @@ __Demo:__
 
 <img src="./example/screencast.gif" alt="demo" width="600">
 
+__Grid layout:(incomplete)__
+
+<img src="./example/grid.gif" alt="grid" width="400">
+
 ## Installation
 
 	go get github.com/gizak/termui

block.go

@@ -77,3 +77,23 @@ func (d *Block) Buffer() []Point {
 	}
 	return ps
 }
+
+func (d Block) GetHeight() int {
+	return d.Height
+}
+
+func (d Block) GetWidth() int {
+	return d.Width
+}
+
+func (d *Block) SetX(x int) {
+	d.X = x
+}
+
+func (d *Block) SetY(y int) {
+	d.Y = y
+}
+
+func (d *Block) SetWidth(w int) {
+	d.Width = w
+}

example/grid.go

@@ -0,0 +1,86 @@
+package main
+
+import ui "github.com/gizak/termui"
+import tm "github.com/nsf/termbox-go"
+import "math"
+
+import "time"
+
+func main() {
+	err := ui.Init()
+	if err != nil {
+		panic(err)
+	}
+	defer ui.Close()
+
+	sinps := (func() []float64 {
+		n := 400
+		ps := make([]float64, n)
+		for i := range ps {
+			ps[i] = 1 + math.Sin(float64(i)/5)
+		}
+		return ps
+	})()
+	sinpsint := (func() []int {
+		ps := make([]int, len(sinps))
+		for i, v := range sinps {
+			ps[i] = int(100*v + 10)
+		}
+		return ps
+	})()
+
+	ui.UseTheme("helloworld")
+
+	spark := ui.Sparkline{}
+	spark.Height = 8
+	spdata := sinpsint
+	spark.Data = spdata
+	spark.LineColor = ui.ColorCyan
+	spark.TitleColor = ui.ColorWhite
+
+	sp := ui.NewSparklines(spark)
+	sp.Height = 11
+	sp.Border.Label = "Sparkline"
+
+	lc := ui.NewLineChart()
+	lc.Border.Label = "braille-mode Line Chart"
+	lc.Data = sinps
+	lc.Height = 11
+	lc.AxesColor = ui.ColorWhite
+	lc.LineColor = ui.ColorYellow | ui.AttrBold
+
+	ui.Body.Rows = []ui.Row{
+		ui.NewRow(
+			ui.NewCol(sp, 6, 0, true),
+			ui.NewCol(lc, 6, 0, true))}
+
+	draw := func(t int) {
+		sp.Lines[0].Data = spdata[t:]
+		lc.Data = sinps[2*t:]
+		ui.Render(ui.Body)
+	}
+
+	evt := make(chan tm.Event)
+	go func() {
+		for {
+			evt <- tm.PollEvent()
+		}
+	}()
+
+	i := 0
+	for {
+		select {
+		case e := <-evt:
+			if e.Type == tm.EventKey && e.Ch == 'q' {
+				return
+			}
+		default:
+			draw(i)
+			i++
+			if i == 102 {
+				return
+			}
+			time.Sleep(time.Second / 2)
+		}
+	}
+}

grid.go

@@ -0,0 +1,67 @@
+package termui
+
+import tm "github.com/nsf/termbox-go"
+
+type container struct {
+	//Height  int
+	//Width   int
+	BgColor Attribute
+	Rows    []Row
+}
+
+type Row []Col
+
+type Col struct {
+	ColumnBufferer
+	Offset int // 0 ~ 11
+	Span   int // 1 ~ 12
+	Sticky bool
+}
+
+type ColumnBufferer interface {
+	Bufferer
+	GetHeight() int
+	GetWidth() int
+	SetWidth(int)
+	SetX(int)
+	SetY(int)
+}
+
+func NewRow(cols ...Col) Row {
+	return cols
+}
+
+func NewCol(block ColumnBufferer, span, offset int, sticky bool) Col {
+	return Col{ColumnBufferer: block, Span: span, Sticky: sticky, Offset: offset}
+}
+
+func (c container) Buffer() []Point {
+	ps := []Point{}
+	maxw, _ := tm.Size()
+
+	y := 0
+	for _, row := range c.Rows {
+		x := 0
+		maxHeight := 0
+
+		for _, col := range row {
+			if h := col.GetHeight(); h > maxHeight {
+				maxHeight = h
+			}
+
+			w := int(float64(maxw*(col.Span+col.Offset)) / 12.0)
+			if col.Sticky || col.GetWidth() > w {
+				col.SetWidth(w)
+			}
+
+			col.SetY(y)
+			col.SetX(x)
+			ps = append(ps, col.Buffer()...)
+			x += w + int(float64(maxw*col.Offset)/12)
+		}
+		y += maxHeight
+	}
+	return ps
+}
+
+var Body container

render.go

@@ -8,6 +8,10 @@ type Bufferer interface {
 }
 
 func Init() error {
+	Body = container{
+		BgColor: theme.BodyBg,
+		Rows:    []Row{},
+	}
 	return tm.Init()
 }