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// 13 february 2014
package main
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 {
// The controls of the Stack. Once the Window containing the Stack has been created, this should not be modified.
Controls []Control
lock sync.Mutex
created bool
orientation Orientation
}
// NewStack creates a new Stack with the specified orientation.
func NewStack(o Orientation) *Stack {
if o != Horizontal && o != Vertical {
panic(fmt.Sprintf("invalid orientation %d given to NewStack()", o))
}
return &Stack{
orientation: o,
}
}
// TODO adorn errors with which stage failed
func (s *Stack) apply(window *sysData) error {
for _, c := range s.Controls {
err := c.apply(window)
if err != nil {
return err
}
}
return nil
}
// TODO adorn errors with which stage failed
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 _, c := range s.Controls {
err := c.setRect(x, y, width, height)
if err != nil {
return err
}
x += dx
y += dy
}
return nil
}
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