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package layout
import (
"image"
"image/color"
"image/draw"
"github.com/faiface/gui"
)
type box struct {
Contents []*gui.Env
Background color.Color
Split SplitFunc
Gap int
vertical bool
}
// NewBox creates a familiar flexbox-like list layout.
// It can be horizontal or vertical.
func NewBox(contents []*gui.Env, options ...func(*box)) Layout {
ret := &box{
Background: image.Black,
Contents: contents,
Split: EvenSplit,
}
for _, f := range options {
f(ret)
}
return ret
}
// BoxVertical changes the otherwise horizontal Box to be vertical.
func BoxVertical(b *box) {
b.vertical = true
}
// BoxBackground changes the background of the box to a uniform color.
func BoxBackground(c color.Color) func(*box) {
return func(grid *box) {
grid.Background = c
}
}
// BoxSplit changes the way the space is divided among the elements.
func BoxSplit(split SplitFunc) func(*box) {
return func(grid *box) {
grid.Split = split
}
}
// BoxGap changes the box gap.
// The gap is identical everywhere (top, left, bottom, right).
func BoxGap(gap int) func(*box) {
return func(grid *box) {
grid.Gap = gap
}
}
func (g *box) Redraw(drw draw.Image, bounds image.Rectangle) {
draw.Draw(drw, bounds, image.NewUniform(g.Background), image.ZP, draw.Src)
}
func (g *box) Items() []*gui.Env {
return g.Contents
}
func (g *box) Lay(bounds image.Rectangle) []image.Rectangle {
items := len(g.Contents)
ret := make([]image.Rectangle, 0, items)
if g.vertical {
spl := g.Split(items, bounds.Dy()-(g.Gap*(items+1)))
Y := bounds.Min.Y + g.Gap
for _, item := range spl {
ret = append(ret, image.Rect(bounds.Min.X+g.Gap, Y, bounds.Max.X-g.Gap, Y+item))
Y += item + g.Gap
}
} else {
spl := g.Split(items, bounds.Dx()-(g.Gap*(items+1)))
X := bounds.Min.X + g.Gap
for _, item := range spl {
ret = append(ret, image.Rect(X, bounds.Min.Y+g.Gap, X+item, bounds.Max.Y-g.Gap))
X += item + g.Gap
}
}
return ret
}
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