Add feedback components 106-130; inert scope, focus return, two-step deploy

feedback/combocounter.go

@@ -0,0 +1,45 @@
+package feedback
+
+import (
+	"strconv"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type ComboCounterOptions struct{}
+
+type comboKey struct{}
+
+// ComboCounter shows ×n COMBO!, popping bigger as n rises.
+func ComboCounter(c *ui.Context, count int, o ComboCounterOptions) *ui.Element {
+	k := pixel.K(c)
+	e := ui.Box(c)
+	s := ui.Local(e, comboKey{}, func() rise { return rise{level: count} })
+	if count > s.level {
+		s.at = k.Now()
+	}
+	s.level = count
+	if count <= 0 {
+		return e
+	}
+	pop := !k.Reduce() && since(c, k, s.at, 10, 2) < 2
+	n, tag := "×"+strconv.Itoa(count), k.Msg("combo")
+	w := pixel.Measure(n)*3 + 6 + pixel.Measure(tag)*2 + 2
+	return e.Role(ui.RoleStatus).Label(n+" "+tag).Size(k.D(w), k.D(3*pixel.LineHeight+2)).Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		x := pixel.Measure(n)*3 + 6
+		word := func(dx, dy int, ink pixel.Slot) {
+			g.Text(1+dx, 1+dy, n, ink, 3)
+			g.Text(x+dx, pixel.LineHeight+dy, tag, ink, 2)
+		}
+		word(1, 1, pixel.Shade)
+		if pop {
+			for _, d := range [][2]int{{-1, 0}, {1, 0}, {0, -1}, {0, 1}} {
+				word(d[0], d[1], pixel.Warn)
+			}
+		}
+		word(0, 0, pixel.Warn)
+	})
+}