72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
// 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 {
|
|
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
|
|
}
|