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

feedback/progress.go

@@ -0,0 +1,57 @@
+package feedback
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type ProgressOptions struct {
+	// Width is the bar in dots; zero means 120.
+	Width int
+	// Percent shows the number after the bar.
+	Percent bool
+}
+
+// Progress fills chunk by chunk; below zero a block runs.
+func Progress(c *ui.Context, text string, value float64, o ProgressOptions) *ui.Element {
+	k := pixel.K(c)
+	if value > 1 || math.IsNaN(value) {
+		panic(fmt.Sprintf("feedback: Progress value %v is past 1", value))
+	}
+	w := pixel.Or("Progress Width", o.Width, 120)
+	n := (w - 3) / 5
+	pct := strconv.Itoa(int(math.Round(value*100))) + "%"
+	e := ui.Box(c).Role(ui.RoleProgress).Label(text)
+	full := w
+	if value < 0 {
+		e.Description(k.Msg("loading"))
+	} else {
+		e.Description(pct)
+		if o.Percent {
+			full += 4 + pixel.MicroWidth("100%")
+		}
+	}
+	return e.Size(k.D(full), k.D(10)).Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		g.Frame(0, 0, w, 10, pixel.Sunken, pixel.Well)
+		chunk := func(i int) { g.Rect(3+i*5, 3, 4, 4, pixel.Accent) }
+		if value < 0 {
+			at := pingpong(g.Busy(12), n-3)
+			for i := range 3 {
+				chunk(at + i)
+			}
+			return
+		}
+		for i := range int(value * float64(n)) {
+			chunk(i)
+		}
+		if o.Percent {
+			g.Micro(w+4, 2, pct, pixel.Ink, 1)
+		}
+	})
+}