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

feedback/hourglass.go

@@ -0,0 +1,67 @@
+package feedback
+
+import (
+	"strings"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type HourglassOptions struct{}
+
+// glass is the hourglass, by hand; # marks its walls.
+var glass = []string{
+	"############",
+	".#........#.",
+	".#........#.",
+	"..#......#..",
+	"...#....#...",
+	"....#..#....",
+	".....##.....",
+	".....##.....",
+	"....#..#....",
+	"...#....#...",
+	"..#......#..",
+	".#........#.",
+	".#........#.",
+	"############",
+}
+
+// Hourglass drains in steps, then flips.
+func Hourglass(c *ui.Context, text string, o HourglassOptions) *ui.Element {
+	k := pixel.K(c)
+	return ui.Box(c).Role(ui.RoleProgress).Label(text).Size(k.D(14), k.D(14)).Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		f := g.Busy(4) % 8
+		// Frame 6 lies on its side, mid-flip; 7 rests.
+		side := f == 6
+		dot := func(x, y int, s pixel.Slot) {
+			if side {
+				g.Dot(y, 12-x, s)
+			} else {
+				g.Dot(x+1, y, s)
+			}
+		}
+		top, bottom := 4-min(f, 4), min(f, 4)
+		if f >= 6 {
+			top, bottom = 4, 0
+		}
+		for y, row := range glass {
+			l, r := strings.Index(row, "#"), strings.LastIndex(row, "#")
+			for x := range len(row) {
+				switch {
+				case row[x] == '#':
+					dot(x, y, pixel.Edge)
+				case x > l && x < r && (y >= 6-top && y <= 5 || y >= 13-bottom && y <= 12):
+					dot(x, y, pixel.Warn)
+				}
+			}
+		}
+		if f > 0 && f < 5 {
+			for y := 6; y < 13-bottom; y++ {
+				dot(5, y, pixel.Warn)
+			}
+		}
+	})
+}