Row, Column have recommended size support

layouts/rowcol.go

@@ -181,21 +181,57 @@ func (row Row) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 }
 
 func (column Column) RecommendedHeight (hints tomo.LayoutHints, boxes []tomo.Box, width int) int {
-	// TODO
+	height := 0
-	return 0
+	for _, box := range boxes {
+		if box, ok := box.(tomo.ContentBox); ok {
+			height += box.RecommendedHeight(width) 
+		} else {
+			height += box.MinimumSize().Y
+		}
+	}
+	height += hints.Gap.Y * (len(boxes) - 1)
+	return height
 }
 
 func (row Row) RecommendedHeight (hints tomo.LayoutHints, boxes []tomo.Box, width int) int {
-	// TODO
+	height := 0
-	return 0
+	for _, box := range boxes {
+		minimum   := box.MinimumSize()
+		boxHeight := 0
+		if box, ok := box.(tomo.ContentBox); ok {
+			boxHeight = box.RecommendedHeight(minimum.X)
+		} else {
+			boxHeight = minimum.Y
+		}
+		if boxHeight > height { height = boxHeight }
+	}
+	return height
 }
 
 func (column Column) RecommendedWidth (hints tomo.LayoutHints, boxes []tomo.Box, height int) int {
-	// TODO
+	width := 0
-	return 0
+	for _, box := range boxes {
+		minimum   := box.MinimumSize()
+		boxWidth := 0
+		if box, ok := box.(tomo.ContentBox); ok {
+			boxWidth = box.RecommendedHeight(minimum.Y)
+		} else {
+			boxWidth = minimum.X
+		}
+		if boxWidth > width { width = boxWidth }
+	}
+	return width
 }
 
 func (row Row) RecommendedWidth (hints tomo.LayoutHints, boxes []tomo.Box, height int) int {
-	// TODO
+	width := 0
-	return 0
+	for _, box := range boxes {
+		if box, ok := box.(tomo.ContentBox); ok {
+			width += box.RecommendedWidth(height)
+		} else {
+			width += box.MinimumSize().X
+		}
+	}
+	width += hints.Gap.X * (len(boxes) - 1)
+	return width
 }