74 lines
1.6 KiB
Go
74 lines
1.6 KiB
Go
package display
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/egoist/mygo/ui"
|
|
|
|
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
|
|
)
|
|
|
|
type Side uint8
|
|
|
|
const (
|
|
Bottom Side = iota
|
|
Top
|
|
Left
|
|
Right
|
|
)
|
|
|
|
type BubbleOptions struct {
|
|
// Tail is the side the tail leaves from.
|
|
Tail Side
|
|
// At offsets the tail along its side; zero means 8.
|
|
At int
|
|
}
|
|
|
|
const tailLen = 5
|
|
|
|
// Bubble is a speech bubble with a tail around children.
|
|
func Bubble(c *ui.Context, o BubbleOptions, children func()) *ui.Element {
|
|
if o.Tail > Right {
|
|
panic(fmt.Sprintf("display: unknown Side %d", o.Tail))
|
|
}
|
|
k := pixel.K(c)
|
|
at := orDef("Bubble At", o.At, 8)
|
|
pad := [4]int{6, 8, 6, 8}
|
|
pad[[...]int{Bottom: 2, Top: 0, Left: 3, Right: 1}[o.Tail]] += tailLen
|
|
return ui.Column(c).Padding(k.D(pad[0]), k.D(pad[1]), k.D(pad[2]), k.D(pad[3])).Draw(func(p *ui.Painter, r ui.Rect) {
|
|
g := k.Canvas(p, r)
|
|
x, y, w, h := 0, 0, g.W, g.H
|
|
switch o.Tail {
|
|
case Bottom:
|
|
h -= tailLen
|
|
case Top:
|
|
y, h = tailLen, h-tailLen
|
|
case Left:
|
|
x, w = tailLen, w-tailLen
|
|
case Right:
|
|
w -= tailLen
|
|
}
|
|
if w < 6 || h < 6 {
|
|
return
|
|
}
|
|
g.Frame(x, y, w, h, pixel.Notched, pixel.Lit)
|
|
for i := range tailLen {
|
|
n := tailLen - i
|
|
switch o.Tail {
|
|
case Bottom:
|
|
g.HLine(x+at-1, y+h-1+i, n+1, pixel.Edge)
|
|
g.HLine(x+at, y+h-1+i, n-1, pixel.Lit)
|
|
case Top:
|
|
g.HLine(x+at-1, y-i, n+1, pixel.Edge)
|
|
g.HLine(x+at, y-i, n-1, pixel.Lit)
|
|
case Left:
|
|
g.VLine(x-i, y+at-1, n+1, pixel.Edge)
|
|
g.VLine(x-i, y+at, n-1, pixel.Lit)
|
|
case Right:
|
|
g.VLine(x+w-1+i, y+at-1, n+1, pixel.Edge)
|
|
g.VLine(x+w-1+i, y+at, n-1, pixel.Lit)
|
|
}
|
|
}
|
|
}).Children(children)
|
|
}
|