// 13 february 2014 package ui import ( "fmt" "sync" ) // Orientation defines the orientation of controls in a Stack. type Orientation int const ( Horizontal Orientation = iota Vertical ) // A Stack stacks controls horizontally or vertically within the Stack's parent, alotting each the same size. type Stack struct { lock sync.Mutex created bool orientation Orientation controls []Control } // NewStack creates a new Stack with the specified orientation. func NewStack(o Orientation, controls ...Control) *Stack { if o != Horizontal && o != Vertical { panic(fmt.Sprintf("invalid orientation %d given to NewStack()", o)) } return &Stack{ orientation: o, controls: controls, } } func (s *Stack) make(window *sysData) error { for i, c := range s.controls { err := c.make(window) if err != nil { return fmt.Errorf("error adding control %d: %v", i, err) } } s.created = true return nil } func (s *Stack) setRect(x int, y int, width int, height int) error { var dx, dy 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 default: panic(fmt.Sprintf("invalid orientation %d given to Stack.setRect()", s.orientation)) } for i, c := range s.controls { err := c.setRect(x, y, width, height) if err != nil { return fmt.Errorf("error setting size of control %d: %v", i, err) } x += dx y += dy } return nil }