72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
// 13 february 2014
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package ui
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import (
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"fmt"
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"sync"
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)
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// Orientation defines the orientation of controls in a Stack.
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type Orientation int
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const (
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Horizontal Orientation = iota
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Vertical
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)
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// A Stack stacks controls horizontally or vertically within the Stack's parent, alotting each the same size.
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type Stack struct {
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lock sync.Mutex
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created bool
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orientation Orientation
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controls []Control
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}
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// NewStack creates a new Stack with the specified orientation.
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func NewStack(o Orientation, controls ...Control) *Stack {
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if o != Horizontal && o != Vertical {
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panic(fmt.Sprintf("invalid orientation %d given to NewStack()", o))
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}
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return &Stack{
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orientation: o,
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controls: controls,
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}
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}
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func (s *Stack) make(window *sysData) error {
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for i, c := range s.controls {
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err := c.make(window)
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if err != nil {
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return fmt.Errorf("error adding control %d: %v", i, err)
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}
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}
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s.created = true
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return nil
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}
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func (s *Stack) setRect(x int, y int, width int, height int) error {
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var dx, dy int
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if len(s.controls) == 0 { // do nothing if there's nothing to do
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return nil
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}
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switch s.orientation {
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case Horizontal:
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dx = width / len(s.controls)
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width = dx
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case Vertical:
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dy = height / len(s.controls)
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height = dy
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default:
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panic(fmt.Sprintf("invalid orientation %d given to Stack.setRect()", s.orientation))
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}
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for i, c := range s.controls {
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err := c.setRect(x, y, width, height)
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if err != nil {
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return fmt.Errorf("error setting size of control %d: %v", i, err)
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}
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x += dx
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y += dy
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}
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return nil
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}
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