added implementation in GO lang

internal/modes/keyboard.go

@@ -0,0 +1,96 @@
+package modes
+
+import (
+	"image/color"
+	"time"
+
+	"github.com/hajimehoshi/ebiten/v2"
+
+	"kidskeyboard/internal/ui"
+)
+
+type KeyboardMode struct {
+	ctx       Context
+	highlight map[ebiten.Key]float64
+	layout    [][]ebiten.Key
+}
+
+func NewKeyboardMode(ctx Context) *KeyboardMode {
+	return &KeyboardMode{
+		ctx:       ctx,
+		highlight: map[ebiten.Key]float64{},
+		layout: [][]ebiten.Key{
+			{ebiten.KeyDigit1, ebiten.KeyDigit2, ebiten.KeyDigit3, ebiten.KeyDigit4, ebiten.KeyDigit5, ebiten.KeyDigit6, ebiten.KeyDigit7, ebiten.KeyDigit8, ebiten.KeyDigit9, ebiten.KeyDigit0},
+			{ebiten.KeyQ, ebiten.KeyW, ebiten.KeyE, ebiten.KeyR, ebiten.KeyT, ebiten.KeyY, ebiten.KeyU, ebiten.KeyI, ebiten.KeyO, ebiten.KeyP},
+			{ebiten.KeyA, ebiten.KeyS, ebiten.KeyD, ebiten.KeyF, ebiten.KeyG, ebiten.KeyH, ebiten.KeyJ, ebiten.KeyK, ebiten.KeyL},
+			{ebiten.KeyZ, ebiten.KeyX, ebiten.KeyC, ebiten.KeyV, ebiten.KeyB, ebiten.KeyN, ebiten.KeyM},
+			{ebiten.KeySpace, ebiten.KeyEnter, ebiten.KeyBackspace},
+		},
+	}
+}
+
+func (m *KeyboardMode) Name() string { return "CTRL+F1 Keyboard" }
+func (m *KeyboardMode) OnEnter()     {}
+func (m *KeyboardMode) OnLeave()     {}
+
+func (m *KeyboardMode) HandleInput() {
+	for _, key := range justPressedKeys() {
+		if !childKey(key) {
+			continue
+		}
+		m.highlight[key] = 1
+		freq := 220 + float64(int(key)%48)*18
+		m.ctx.Audio.PlayTone(freq, 120*time.Millisecond, 0.22)
+	}
+}
+
+func (m *KeyboardMode) Update() {
+	for key, v := range m.highlight {
+		v -= 0.035
+		if v <= 0 {
+			delete(m.highlight, key)
+			continue
+		}
+		m.highlight[key] = v
+	}
+}
+
+func (m *KeyboardMode) Draw(screen *ebiten.Image) {
+	screen.Fill(color.Black)
+	w, h := screen.Bounds().Dx(), screen.Bounds().Dy()
+	keyW := float32(w) / 13
+	keyH := float32(h) / 10
+	gap := float32(8)
+	startY := float32(h)/2 - keyH*2.7
+
+	for rowIndex, row := range m.layout {
+		rowWidth := float32(len(row))*(keyW+gap) - gap
+		if rowIndex == 4 {
+			rowWidth = keyW*7 + gap*2
+		}
+		x := (float32(w) - rowWidth) / 2
+		y := startY + float32(rowIndex)*(keyH+gap)
+		for _, key := range row {
+			drawW := keyW
+			if key == ebiten.KeySpace {
+				drawW = keyW * 3
+			}
+			if key == ebiten.KeyEnter || key == ebiten.KeyBackspace {
+				drawW = keyW * 2
+			}
+			m.drawKey(screen, key, x, y, drawW, keyH)
+			x += drawW + gap
+		}
+	}
+	ui.CenteredText(screen, "CTRL+F1", w/2, 48, color.White, 2)
+}
+
+func (m *KeyboardMode) drawKey(screen *ebiten.Image, key ebiten.Key, x, y, w, h float32) {
+	base := color.NRGBA{R: 18, G: 18, B: 18, A: 255}
+	if v := m.highlight[key]; v > 0 {
+		base = color.NRGBA{R: uint8(60 + 180*v), G: uint8(80 + 160*v), B: 255, A: 255}
+	}
+	ui.Rect(screen, x, y, w, h, base)
+	ui.RectOutline(screen, x, y, w, h, 2, color.White)
+	ui.CenteredText(screen, keyLabel(key), int(x+w/2), int(y+h/2), color.White, 2)
+}