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|
package animatedtext
import (
"sync"
"time"
tea "github.com/charmbracelet/bubbletea"
)
var (
lastID int
mutex sync.Mutex
)
func nextID() int {
mutex.Lock()
defer mutex.Unlock()
lastID++
return lastID
}
type AnimatedText struct {
FullText string
PrintPauseTime time.Duration
}
type Model struct {
AnimatedText AnimatedText
id int
currentCharIdx int
finished bool
}
func New(text string, pauseTime time.Duration) Model {
m := Model{
AnimatedText: AnimatedText{FullText: text, PrintPauseTime: pauseTime},
id: nextID(),
currentCharIdx: 0,
}
return m
}
type TickMsg struct {
Time time.Time
ID int
}
func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
if m.finished {
return m, nil
}
switch msg := msg.(type) {
case TickMsg:
if msg.ID > 0 && msg.ID != m.id {
return m, nil
}
if m.currentCharIdx + 1 >= len(m.AnimatedText.FullText) {
m.finished = true
return m, nil
}
m.currentCharIdx++
return m, m.tick(m.id)
default:
return m, nil
}
}
func (m Model) View() string {
if (m.finished) {
return m.AnimatedText.FullText
}
return m.AnimatedText.FullText[0:m.currentCharIdx]
}
func (m Model) tick(id int) tea.Cmd {
return tea.Tick(m.AnimatedText.PrintPauseTime, func(t time.Time) tea.Msg {
return TickMsg{
Time: t,
ID: id,
}
})
}
func Tick() tea.Msg {
return TickMsg{Time: time.Now()}
}
|
