Add Float prop

block.go

@@ -120,6 +120,7 @@ type Block struct {
 	PaddingLeft   int
 	PaddingRight  int
 	id            string
+	Float         Align
 }
 
 // NewBlock returns a *Block which inherits styles from current theme.
@@ -139,6 +140,7 @@ func NewBlock() *Block {
 	b.Width = 2
 	b.Height = 2
 	b.id = GenId()
+	b.Float = AlignNone
 	return &b
 }
 
@@ -148,13 +150,19 @@ func (b Block) Id() string {
 
 // Align computes box model
 func (b *Block) Align() {
-	b.area.Min.X = b.X
-	b.area.Min.Y = b.Y
-	b.area.Max.X = b.X + b.Width
-	b.area.Max.Y = b.Y + b.Height
+	// outer
+	b.area.Min.X = 0
+	b.area.Min.Y = 0
+	b.area.Max.X = b.Width
+	b.area.Max.Y = b.Height
 
-	b.innerArea.Min.X = b.X + b.PaddingLeft
-	b.innerArea.Min.Y = b.Y + b.PaddingTop
+	// float
+	b.area = AlignArea(TermRect(), b.area, b.Float)
+	b.area = MoveArea(b.area, b.X, b.Y)
+
+	// inner
+	b.innerArea.Min.X = b.area.Min.X + b.PaddingLeft
+	b.innerArea.Min.Y = b.area.Min.Y + b.PaddingTop
 	b.innerArea.Max.X = b.area.Max.X - b.PaddingRight
 	b.innerArea.Max.Y = b.area.Max.Y - b.PaddingBottom
 

block_test.go

@@ -1,8 +1,25 @@
 package termui
 
-import "testing"
+import (
+	"testing"
+)
+
+func TestBlockFloat(t *testing.T) {
+	Init()
+	defer Close()
+
+	b := NewBlock()
+	b.X = 10
+	b.Y = 20
+
+	b.Float = AlignCenter
+	b.Align()
+}
+
+func TestBlockInnerBounds(t *testing.T) {
+	Init()
+	defer Close()
 
-func TestBlock_InnerBounds(t *testing.T) {
 	b := NewBlock()
 	b.X = 10
 	b.Y = 11
@@ -16,11 +33,12 @@ func TestBlock_InnerBounds(t *testing.T) {
 		cy := area.Min.Y
 		cw := area.Dx()
 		ch := area.Dy()
+
 		if cx != x {
 			t.Errorf("expected x to be %d but got %d", x, cx)
 		}
 		if cy != y {
-			t.Errorf("expected y to be %d but got %d", y, cy)
+			t.Errorf("expected y to be %d but got %d\n%+v", y, cy, area)
 		}
 		if cw != w {
 			t.Errorf("expected width to be %d but got %d", w, cw)

gauge.go

@@ -21,16 +21,6 @@ import (
   g.PercentColor = termui.ColorBlue
 */
 
-// Align is the position of the gauge's label.
-type Align int
-
-// All supported positions.
-const (
-	AlignLeft Align = iota
-	AlignCenter
-	AlignRight
-)
-
 type Gauge struct {
 	Block
 	Percent      int

pos.go

@@ -0,0 +1,71 @@
+package termui
+
+import "image"
+
+// Align is the position of the gauge's label.
+type Align uint
+
+// All supported positions.
+const (
+	AlignNone Align = 0
+	AlignLeft Align = 1 << iota
+	AlignRight
+	AlignBottom
+	AlignTop
+	AlignCenterVertical
+	AlignCenterHorizontal
+	AlignCenter = AlignCenterVertical | AlignCenterHorizontal
+)
+
+func AlignArea(parent, child image.Rectangle, a Align) image.Rectangle {
+	w, h := child.Dx(), child.Dy()
+
+	// parent center
+	pcx, pcy := parent.Min.X+parent.Dx()/2, parent.Min.Y+parent.Dy()/2
+	// child center
+	ccx, ccy := child.Min.X+child.Dx()/2, child.Min.Y+child.Dy()/2
+
+	if a&AlignLeft == AlignLeft {
+		child.Min.X = parent.Min.X
+		child.Max.X = child.Min.X + w
+	}
+
+	if a&AlignRight == AlignRight {
+		child.Max.X = parent.Max.X
+		child.Min.X = child.Max.X - w
+	}
+
+	if a&AlignBottom == AlignBottom {
+		child.Max.Y = parent.Max.Y
+		child.Min.Y = child.Max.Y - h
+	}
+
+	if a&AlignTop == AlignRight {
+		child.Min.Y = parent.Min.Y
+		child.Max.Y = child.Min.Y + h
+	}
+
+	if a&AlignCenterHorizontal == AlignCenterHorizontal {
+		child.Min.X += pcx - ccx
+		child.Max.X = child.Min.X + w
+	}
+
+	if a&AlignCenterVertical == AlignCenterVertical {
+		child.Min.Y += pcy - ccy
+		child.Max.Y = child.Min.Y + h
+	}
+
+	return child
+}
+
+func MoveArea(a image.Rectangle, dx, dy int) image.Rectangle {
+	a.Min.X += dx
+	a.Max.X += dx
+	a.Min.Y += dy
+	a.Max.Y += dy
+	return a
+}
+
+func TermRect() image.Rectangle {
+	return image.Rect(0, 0, TermWidth(), TermHeight())
+}

pos_test.go

@@ -0,0 +1,34 @@
+package termui
+
+import (
+	"image"
+	"testing"
+)
+
+func TestAlignArea(t *testing.T) {
+	p := image.Rect(0, 0, 100, 100)
+	c := image.Rect(10, 10, 20, 20)
+
+	nc := AlignArea(p, c, AlignLeft)
+	if nc.Min.X != 0 || nc.Max.Y != 20 {
+		t.Errorf("AlignLeft failed:\n%+v", nc)
+	}
+
+	nc = AlignArea(p, c, AlignCenter)
+	if nc.Min.X != 45 || nc.Max.Y != 55 {
+		t.Error("AlignCenter failed")
+	}
+
+	nc = AlignArea(p, c, AlignBottom|AlignRight)
+	if nc.Min.X != 90 || nc.Max.Y != 100 {
+		t.Errorf("AlignBottom|AlignRight failed\n%+v", nc)
+	}
+}
+
+func TestMoveArea(t *testing.T) {
+	a := image.Rect(10, 10, 20, 20)
+	a = MoveArea(a, 5, 10)
+	if a.Min.X != 15 || a.Min.Y != 20 || a.Max.X != 25 || a.Max.Y != 30 {
+		t.Error("MoveArea failed")
+	}
+}

test/runtest.go

@@ -26,10 +26,11 @@ func main() {
 	//termui.UseTheme("helloworld")
 	b := termui.NewBlock()
 	b.Width = 20
-	b.Height = 30
+	b.Height = 20
+	b.Float = termui.AlignCenter
 	b.BorderLabel = "[HELLO](fg-red,bg-white) [WORLD](fg-blue,bg-green)"
 
-	termui.SendBufferToRender(b)
+	termui.Render(b)
 
 	termui.Handle("/sys", func(e termui.Event) {
 		k, ok := e.Data.(termui.EvtKbd)
@@ -48,7 +49,7 @@ func main() {
 			b.BorderLabel = "[HELLO](fg-blue,bg-white) [WORLD](fg-red,bg-green)"
 		}
 
-		termui.SendBufferToRender(b)
+		termui.Render(b)
 
 	})
 	termui.Loop()