Rewrite grid

grid.go

@@ -2,9 +2,10 @@ package termui
 
 import tm "github.com/nsf/termbox-go"
 
+/*
 type container struct {
-	//Height  int
-	//Width   int
+	height  int
+	width   int
 	BgColor Attribute
 	Rows    []Row
 }
@@ -12,16 +13,14 @@ type container struct {
 type Row []Col
 
 type Col struct {
-	ColumnBufferer
+	Blocks []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)
@@ -31,8 +30,64 @@ 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 NewCol(span, offset int, blocks ...ColumnBufferer) Col {
+	return Col{Blocks: blocks, Span: span, Offset: offset}
+}
+
+// Highest col is the height of a Row
+func (r Row) GetHeight() int {
+	h := 0
+	for _, v := range r {
+		if nh := v.GetHeight(); nh > h {
+			h = nh
+		}
+	}
+	return h
+}
+
+// Set width according to its span
+func (r Row) SetWidth(w int) {
+	for _, c := range r {
+		c.SetWidth(int(float64(w*c.Span) / 12.0))
+	}
+}
+
+// Set x y
+func (r Row) SetX(x int) {
+	for i := range r {
+		r[i].SetX(x)
+	}
+}
+
+func (r Row) SetY(y int) {
+	for i := range r {
+		r[i].SetY(y)
+	}
+}
+
+// GetHeight recursively retrieves height of each children, then add them up.
+func (c Col) GetHeight() int {
+	h := 0
+	for _, v := range c.Blocks {
+		h += c.GetHeight()
+	}
+	return h
+}
+
+func (c Col) GetWidth() int {
+	w := 0
+	for _, v := range c.Blocks {
+		if nw := v.GetWidth(); nw > w {
+			w = nw
+		}
+	}
+	return w
+}
+
+func (c Col) SetWidth(w int) {
+	for i := range c.Blocks {
+		c.SetWidth(w)
+	}
 }
 
 func (c container) Buffer() []Point {
@@ -50,7 +105,7 @@ func (c container) Buffer() []Point {
 			}
 
 			w := int(float64(maxw*(col.Span+col.Offset)) / 12.0)
-			if col.Sticky || col.GetWidth() > w {
+			if col.GetWidth() > w {
 				col.SetWidth(w)
 			}
 
@@ -63,5 +118,134 @@ func (c container) Buffer() []Point {
 	}
 	return ps
 }
+*/
 
-var Body container
+type LayoutBufferer interface {
+	Bufferer
+	GetHeight() int
+	SetWidth(int)
+	SetX(int)
+	SetY(int)
+}
+
+// build a layout tree
+type row struct {
+	Cols   []*row
+	Widget LayoutBufferer // only leaves hold this
+	X      int
+	Y      int
+	Width  int
+	Height int
+	Span   int
+	Offset int
+}
+
+func newContainer() *row {
+	w, _ := tm.Size()
+	r := &row{Width: w, Span: 12, X: 0, Y: 0, Cols: []*row{}}
+	return r
+}
+
+func (r *row) layout() {
+	r.assignWidth(r.Width)
+	r.solveHeight()
+	r.assignX(r.X)
+	r.assignY(r.Y)
+}
+
+func (r *row) isLeaf() bool {
+	return r.Cols == nil || len(r.Cols) == 0
+}
+
+func (r *row) isRenderableLeaf() bool {
+	return r.isLeaf() && r.Widget != nil
+}
+
+func (r *row) assignWidth(w int) {
+	cw := int(float64(w*r.Span) / 12)
+	r.Width = cw
+
+	for i, _ := range r.Cols {
+		r.Cols[i].assignWidth(cw)
+	}
+}
+
+// bottom up
+func (r *row) solveHeight() int {
+	if r.isRenderableLeaf() {
+		r.Height = r.Widget.GetHeight()
+		return r.Widget.GetHeight()
+	}
+
+	maxh := 0
+	if !r.isLeaf() {
+		for _, c := range r.Cols {
+			nh := c.solveHeight()
+			// when embed rows in Cols, row widgets stack up
+			if r.Widget != nil {
+				nh += r.Widget.GetHeight()
+			}
+			if nh > maxh {
+				maxh = nh
+			}
+		}
+	}
+
+	r.Height = maxh
+	return maxh
+}
+
+func (r *row) assignX(x int) {
+	if r.isRenderableLeaf() {
+		r.Widget.SetX(x)
+	}
+
+	if !r.isLeaf() {
+		acc := 0
+		for i, c := range r.Cols {
+			r.Cols[i].assignX(x + acc)
+			acc += c.Width
+			if c.Offset != 0 {
+				acc += int(float64(c.Offset*c.Width) / float64(12*c.Span))
+			}
+		}
+	}
+	r.X = x
+}
+
+func (r *row) assignY(y int) {
+	r.Y = y
+
+	if r.isRenderableLeaf() {
+		r.Widget.SetY(y)
+		return
+	}
+
+	for i := range r.Cols {
+		acc := 0
+		if r.Widget != nil {
+			acc = r.Widget.GetHeight()
+		}
+		r.Cols[i].assignY(y + acc)
+	}
+
+}
+
+// recursively merge all widgets buffer
+func (r *row) Buffer() []Point {
+	merged := []Point{}
+
+	if r.isRenderableLeaf() {
+		return r.Widget.Buffer()
+	}
+
+	if !r.isLeaf() {
+		for _, c := range r.Cols {
+			merged = append(merged, c.Buffer()...)
+		}
+	}
+
+	return merged
+}
+
+//var Body container

grid_test.go

@@ -0,0 +1,83 @@
+package termui
+
+import (
+	"testing"
+
+	"github.com/davecgh/go-spew/spew"
+)
+
+var r *row
+
+func TestRowWidth(t *testing.T) {
+	p0 := NewPar("p0")
+	p0.Height = 1
+	p1 := NewPar("p1")
+	p1.Height = 1
+	p2 := NewPar("p2")
+	p2.Height = 1
+	p3 := NewPar("p3")
+	p3.Height = 1
+
+	/* test against tree:
+
+	       r
+	     /  \
+	   0:w   1
+	        / \
+	     10:w 11
+	          /
+	        110:w
+	         /
+	       1100:w
+	*/
+	r = &row{
+		Span: 12,
+		Cols: []*row{
+			&row{Widget: p0, Span: 6},
+			&row{
+				Span: 6,
+				Cols: []*row{
+					&row{Widget: p1, Span: 6},
+					&row{
+						Span: 6,
+						Cols: []*row{
+							&row{
+								Span:   12,
+								Widget: p2,
+								Cols: []*row{
+									&row{Span: 12, Widget: p3}}}}}}}}}
+	r.assignWidth(100)
+	if r.Width != 100 ||
+		(r.Cols[0].Width) != 50 ||
+		(r.Cols[1].Width) != 50 ||
+		(r.Cols[1].Cols[0].Width) != 25 ||
+		(r.Cols[1].Cols[1].Width) != 25 ||
+		(r.Cols[1].Cols[1].Cols[0].Width) != 25 ||
+		(r.Cols[1].Cols[1].Cols[0].Cols[0].Width) != 25 {
+		t.Error("assignWidth fails")
+	}
+}
+
+func TestRowHeight(t *testing.T) {
+	spew.Dump()
+	if (r.solveHeight()) != 2 ||
+		(r.Cols[1].Cols[1].Height) != 2 ||
+		(r.Cols[1].Cols[1].Cols[0].Height) != 2 ||
+		(r.Cols[1].Cols[0].Height) != 1 {
+		t.Error("solveHeight fails")
+	}
+}
+
+func TestAssignXY(t *testing.T) {
+	r.assignX(0)
+	r.assignY(0)
+	if (r.Cols[0].X) != 0 ||
+		(r.Cols[1].Cols[0].X) != 50 ||
+		(r.Cols[1].Cols[1].X) != 75 ||
+		(r.Cols[1].Cols[1].Cols[0].X) != 75 ||
+		(r.Cols[1].Cols[0].Y) != 0 ||
+		(r.Cols[1].Cols[1].Cols[0].Y) != 0 ||
+		(r.Cols[1].Cols[1].Cols[0].Cols[0].Y) != 1 {
+		t.Error("assignXY fails")
+	}
+}

render.go

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