diff options
Diffstat (limited to 'stack.go')
| -rw-r--r-- | stack.go | 62 |
1 files changed, 47 insertions, 15 deletions
@@ -23,8 +23,7 @@ type Stack struct { orientation Orientation controls []Control stretchy []bool - xpos, ypos []int // caches to avoid reallocating these each time - width, height []int + width, height []int // caches to avoid reallocating these each time } // NewStack creates a new Stack with the specified orientation. @@ -33,8 +32,6 @@ func NewStack(o Orientation, controls ...Control) *Stack { orientation: o, controls: controls, stretchy: make([]bool, len(controls)), - xpos: make([]int, len(controls)), - ypos: make([]int, len(controls)), width: make([]int, len(controls)), height: make([]int, len(controls)), } @@ -61,25 +58,60 @@ 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 return nil } - switch s.orientation { - case Horizontal: - dx = width / len(s.controls) - width = dx - case Vertical: - dy = height / len(s.controls) - height = dy + // 1) get height and width of non-stretchy controls; figure out how much space is alloted to stretchy controls + stretchywid = width + stretchyht = height + nStretchy := 0 + for i, c := range s.controls { + if s.stretchy[i] { + nStretchy++ + continue + } + w, h, err := c.preferredSize() + if err != nil { + return fmt.Errorf("error getting preferred size of control %d in Stack.setRect(): %v", i, err) + } + if s.orientation == Horizontal { // all controls have same height + s.width[i] = w + s.height[i] = height + stretchywid -= w + } else { // all controls have same width + s.width[i] = width + s.height[i] = h + stretchyht -= h + } } + // 2) figure out size of stretchy controls + if nStretchy != 0 { + if s.orientation == Horizontal { // split rest of width + stretchywid /= nStretchy + } else { // split rest of height + stretchyht /= nStretchy + } + } + for i, c := range controls { + if !s.stretchy[i] { + continue + } + c.width[i] = stretchywid + c.height[i] = stretchyht + } + // 3) now actually place controls for i, c := range s.controls { - err := c.setRect(x, y, width, height) + err := c.setRect(x, y, s.width[i], s.height[i]) if err != nil { - return fmt.Errorf("error setting size of control %d: %v", i, err) + return fmt.Errorf("error setting size of control %d in Stack.setRect(): %v", i, err) + } + if s.orientation == Horizontal { + x += s.width[i] + } else { + y += s.height[i] } - x += dx - y += dy } return nil } |