// This function assumes it is given byte indices corresponding to a word,
// and i, n are the beginning and end of that word, respectively.
func isWord(txt string, i, n int) bool {
if i == 0 {
return !syntax.IsWordChar(rune(txt[n+1]))
} else if n == len(txt)-1 {
return !syntax.IsWordChar(rune(txt[i-1]))
}
return !syntax.IsWordChar(rune(txt[i-1])) && !syntax.IsWordChar(rune(txt[n+1]))
}
// handleEvent processes keyboard events an processes valid input accordingly.
func handleEvent(ev tb.Event) {
switch term.mode {
case cmdMode:
if term.dm.Curr != nil {
if ev.Ch == 'q' && term.cur.sec == 1 {
term.dm.ClearBeats(term.cur.row)
} else if ev.Ch == 't' {
term.mode = tempoMode
} else if ev.Ch == 'r' {
term.dm.ChangeTempo(term.dm.Curr.Tempo - 2)
} else if ev.Ch == 'y' {
term.dm.ChangeTempo(term.dm.Curr.Tempo + 2)
} else if ev.Ch == 'e' && term.cur.sec == 1 {
term.dm.EnableSection(term.cur.row)
} else if ev.Ch == 'w' && term.cur.sec == 1 {
term.dm.ToggleBeat(term.cur.row, term.cur.col)
} else if ev.Ch == 's' {
term.dm.SaveCurrentSequence(term.dm.Curr.Name)
} else if ev.Ch == 'u' {
cr := term.cur.row
if term.cur.sec == 1 && cr < len(term.dm.Curr.Sections)-1 {
s := term.dm.Curr.Sections
s[cr], s[cr+1] = s[cr+1], s[cr]
term.cur.row++
}
} else if ev.Ch == 'i' {
cr := term.cur.row
if term.cur.sec == 1 && cr > 0 {
s := term.dm.Curr.Sections
s[cr], s[cr-1] = s[cr-1], s[cr]
term.cur.row--
}
} else if ev.Ch == 'b' {
term.mode = backupMode
} else if ev.Key == tb.KeySpace {
term.dm.TogglePlayPause()
}
}
if ev.Ch == 'n' {
term.mode = newModePickSample
term.cur.sec = 0
term.cur.row = 0
} else if ev.Key == tb.KeyEnter {
if term.cur.sec == 0 {
term.dm.LoadSequence(term.cur.row)
}
} else {
handleMovement(ev)
}
default:
if ev.Ch != 0 {
if term.mode == tempoMode {
if unicode.IsDigit(ev.Ch) || ev.Ch == '.' {
term.input.WriteRune(ev.Ch)
}
} else if term.mode == newModePickSample {
handleMovement(ev)
} else {
if syntax.IsWordChar(ev.Ch) {
term.input.WriteRune(ev.Ch)
}
}
} else if ev.Key == tb.KeyEnter {
if term.mode == tempoMode {
f, err := strconv.ParseFloat(term.input.String(), 32)
if err == nil {
term.dm.ChangeTempo(float32(f))
}
} else if term.mode == backupMode {
term.dm.SaveCurrentSequence(term.input.String())
} else if term.mode == newModeEnterName {
term.dm.NewSequence(term.input.String(), term.newSample)
}
term.input.Reset()
if term.mode == newModePickSample {
term.newSample = term.sampleNames[term.cur.row]
term.mode = newModeEnterName
} else {
term.mode = cmdMode
}
} else if ev.Key == tb.KeyBackspace || ev.Key == tb.KeyBackspace2 {
if term.input.Len() > 0 {
term.input.Truncate(term.input.Len() - 1)
}
} else if ev.Key == tb.KeyEsc {
term.input.Reset()
term.mode = cmdMode
}
}
drawDrumMachine()
}
