Row, Column have recommended size support

layouts/rowcol.go

@@ -41,12 +41,12 @@ func (row Row) MinimumSize (hints tomo.LayoutHints, boxes []tomo.Box) image.Poin
 
 func (column Column) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 	expands := func (index int) bool {
-		if index < len(boxes) { return false }
+		if index >= len(column) { return false }
 		return column[index]
 	}
 
 	// determine expanding box size
-	expandingSize := 0
+	expandingSize := 0.0
 	if !hints.OverflowY {
 		gaps       := len(boxes) - 1
 		freeSpace  := float64(hints.Bounds.Dy() - hints.Gap.Y * gaps)
@@ -83,7 +83,7 @@ func (column Column) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 			}
 		} else {
 			if expands(index) {
-				height = expandingSize
+				height = int(expandingSize)
 			}
 		}
 
@@ -111,12 +111,12 @@ func (column Column) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 
 func (row Row) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 	expands := func (index int) bool {
-		if index < len(boxes) { return false }
+		if index >= len(row) { return false }
 		return row[index]
 	}
 
 	// determine expanding box size
-	expandingSize := 0
+	expandingSize := 0.0
 	if !hints.OverflowY {
 		gaps       := len(boxes) - 1
 		freeSpace  := float64(hints.Bounds.Dx() - hints.Gap.X * gaps)
@@ -127,6 +127,7 @@ func (row Row) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 				freeSpace -= float64(box.MinimumSize().Y)
 			}
 		}
+		expandingSize = freeSpace / float64(nExpanding)
 	}
 
 	// determine height
@@ -153,7 +154,7 @@ func (row Row) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 			}
 		} else {
 			if expands(index) {
-				width = expandingSize
+				width = int(expandingSize)
 			}
 		}
 
@@ -180,21 +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
-	return 0
+	height := 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
-	return 0
+	height := 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
-	return 0
+	width := 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
-	return 0
+	width := 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
 }