diff options
| -rw-r--r-- | stack.go | 52 |
1 files changed, 48 insertions, 4 deletions
@@ -57,7 +57,6 @@ func (s *Stack) make(window *sysData) error { } func (s *Stack) setRect(x int, y int, width int, height int) error { - var dx, dy int var stretchywid, stretchyht int if len(s.controls) == 0 { // do nothing if there's nothing to do @@ -94,12 +93,12 @@ func (s *Stack) setRect(x int, y int, width int, height int) error { stretchyht /= nStretchy } } - for i, c := range s.controls { + for i := range s.controls { if !s.stretchy[i] { continue } - c.width[i] = stretchywid - c.height[i] = stretchyht + s.width[i] = stretchywid + s.height[i] = stretchyht } // 3) now actually place controls for i, c := range s.controls { @@ -115,3 +114,48 @@ func (s *Stack) setRect(x int, y int, width int, height int) error { } return nil } + +// The preferred size of a Stack is the sum of the preferred sizes of non-stretchy controls + (the number of stretchy controls * the largest preferred size among all stretchy controls). +func (s *Stack) preferredSize() (width int, height int, err error) { + max := func(a int, b int) int { + if a > b { + return a + } + return b + } + + var nStretchy int + var maxswid, maxsht int + + if len(s.controls) == 0 { // no controls, so return emptiness + return 0, 0, nil + } + for i, c := range s.controls { + w, h, err := c.preferredSize() + if err != nil { + return 0, 0, fmt.Errorf("error getting preferred size of control %d in Stack.preferredSize(): %v", i, err) + } + if s.stretchy[i] { + nStretchy++ + maxswid = max(maxswid, w) + maxsht = max(maxsht, h) + } + if s.orientation == Horizontal { // max vertical size + if !s.stretchy[i] { + width += w + } + height = max(height, h) + } else { + width = max(width, w) + if !s.stretchy[i] { + height += h + } + } + } + if s.orientation == Horizontal { + width += nStretchy * maxswid + } else { + height += nStretchy * maxsht + } + return +} |