Add input components 086-105; park focus off disabled controls

input/dpad.go

@@ -0,0 +1,116 @@
+package input
+
+import (
+	"log/slog"
+	"time"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+// Direction is a d-pad arm.
+type Direction uint8
+
+const (
+	None Direction = iota
+	Up
+	Down
+	Left
+	Right
+)
+
+func (d Direction) String() string { return [...]string{"none", "up", "down", "left", "right"}[d] }
+
+type DPadOptions struct {
+	Disabled bool
+}
+
+type DPadResult struct {
+	Element *ui.Element
+	// Pressed is the arm pressed this frame.
+	Pressed Direction
+}
+
+type dpadKey struct{}
+
+// flash is the arm a key lit, and when.
+type flash struct {
+	arm Direction
+	at  time.Time
+}
+
+// DPad is a cross pad reporting arrows and pressed arms.
+func DPad(c *ui.Context, text string, o DPadOptions) DPadResult {
+	k := pixel.K(c)
+	shell, base, st := pixel.Shell(c, func() *ui.Element {
+		return ui.Box(c).Focusable().Role(ui.RoleGroup).Label(text).Disabled(o.Disabled)
+	})
+	lit := ui.Local(base, dpadKey{}, func() flash { return flash{} })
+	res := DPadResult{Element: shell}
+	for _, m := range []struct {
+		key ui.Key
+		arm Direction
+	}{{ui.KeyUp, Up}, {ui.KeyDown, Down}, {ui.KeyLeft, Left}, {ui.KeyRight, Right}} {
+		if base.Shortcut(0, m.key) {
+			res.Pressed = m.arm
+		}
+	}
+	// Taking Enter and Space keeps keys from clicking.
+	base.Shortcut(0, ui.KeyEnter)
+	base.Shortcut(0, ui.KeySpace)
+	at := func() Direction {
+		x, y, _ := base.PointerPosition()
+		return armAt(int(x/k.Dot()), int(y/k.Dot()))
+	}
+	if base.Clicked() {
+		res.Pressed = at()
+	}
+	if res.Pressed != None {
+		*lit = flash{res.Pressed, k.Now()}
+		slog.Debug("8bit: dpad", "label", text, "arm", res.Pressed)
+	}
+	down := None
+	if k.Now().Sub(lit.at) < 150*time.Millisecond {
+		down = lit.arm
+		k.Tick(c, 10)
+	}
+	if st.Press {
+		down = at()
+	}
+	shell.Size(k.D(36), k.D(36)).Draw(func(p *ui.Painter, r ui.Rect) {
+		g := k.Canvas(p, r)
+		g.Rect(12, 0, 12, 36, pixel.Edge)
+		g.Rect(0, 12, 36, 12, pixel.Edge)
+		for _, a := range []struct {
+			arm        Direction
+			x, y, w, h int
+			sp         *pixel.Sprite
+		}{{Up, 13, 1, 10, 11, tinyUp}, {Down, 13, 24, 10, 11, tinyDown}, {Left, 1, 13, 11, 10, tinyLeft}, {Right, 24, 13, 11, 10, tinyRight}} {
+			fill, dy := pixel.Face, 0
+			if down == a.arm {
+				fill, dy = pixel.Shade, 1
+			}
+			g.Rect(a.x, a.y, a.w, a.h, fill)
+			g.Sprite(a.x+(a.w-a.sp.W)/2, a.y+(a.h-a.sp.H)/2+dy, a.sp, 0, pixel.Ink, 1)
+		}
+		g.Rect(13, 13, 10, 10, pixel.Shade)
+		finish(g, st)
+	})
+	return res
+}
+
+// armAt is the arm under a dot of the pad.
+func armAt(x, y int) Direction {
+	switch {
+	case x >= 12 && x < 24 && y < 12:
+		return Up
+	case x >= 12 && x < 24 && y >= 24:
+		return Down
+	case y >= 12 && y < 24 && x < 12:
+		return Left
+	case y >= 12 && y < 24 && x >= 24:
+		return Right
+	}
+	return None
+}