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menu: add wrap-around navigation #11

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menu: add wrap-around navigation #11

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59 changes: 43 additions & 16 deletions menu.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,27 +45,54 @@ func menu() int16 {

tinydraw.FilledCircle(&display, 28, 35, 4, color.RGBA{200, 200, 0, 255})

released := true
btnUpPressed := false
btnDownPressed := false
btnAPressed := false

for {
if released && !btnUp.Get() && selected > 0 {
selected--
tinydraw.FilledCircle(&display, 28, 35+20*selected, 4, color.RGBA{200, 200, 0, 255})
tinydraw.FilledCircle(&display, 28, 35+20*(selected+1), 4, bgColor)
}
if released && !btnDown.Get() && selected < (numOpts-1) {
selected++
tinydraw.FilledCircle(&display, 28, 35+20*selected, 4, color.RGBA{200, 200, 0, 255})
tinydraw.FilledCircle(&display, 28, 35+20*(selected-1), 4, bgColor)
// Detect button press on transition from released to pressed
if !btnUp.Get() {
if !btnUpPressed {
prevSelected := selected
if selected > 0 {
selected--
} else {
selected = numOpts - 1 // Wrap to bottom
}
tinydraw.FilledCircle(&display, 28, 35+20*selected, 4, color.RGBA{200, 200, 0, 255})
tinydraw.FilledCircle(&display, 28, 35+20*prevSelected, 4, bgColor)
}
btnUpPressed = true
} else {
btnUpPressed = false
}
if released && !btnA.Get() {
break

if !btnDown.Get() {
if !btnDownPressed {
prevSelected := selected
if selected < (numOpts - 1) {
selected++
} else {
selected = 0 // Wrap to top
}
tinydraw.FilledCircle(&display, 28, 35+20*selected, 4, color.RGBA{200, 200, 0, 255})
tinydraw.FilledCircle(&display, 28, 35+20*prevSelected, 4, bgColor)
}
btnDownPressed = true
} else {
btnDownPressed = false
}
if btnA.Get() && btnUp.Get() && btnDown.Get() {
released = true

if !btnA.Get() {
if !btnAPressed {
break
}
btnAPressed = true
} else {
released = false
btnAPressed = false
}
time.Sleep(200 * time.Millisecond)

time.Sleep(100 * time.Millisecond)
}
return selected
}