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package main
import (
"fmt"
"math/rand/v2"
"time"
tui "github.com/grindlemire/go-tui"
)
var gradient = tui.NewGradient(tui.BrightCyan, tui.BrightMagenta)
// phrases to cycle through when the user presses Enter.
var phrases = []string{
"The quick brown fox jumps over the lazy dog.",
"Stars scattered across the midnight canvas, each one a whisper of ancient light.",
"Line one of a multi-line message.\nLine two continues here.\nAnd line three wraps it up.",
"Streaming text appears character by character, just like a real-time API response.",
}
type streamDemo struct {
app *tui.App
phraseIdx int
streaming *tui.State[bool]
}
func StreamDemo() *streamDemo {
return &streamDemo{
streaming: tui.NewState(false),
}
}
type person struct {
Name string
Role string
Status string
Score int
}
var (
allNames = []string{"Alice", "Bob", "Carol", "Dave", "Eve", "Frank"}
allRoles = []string{"Engineer", "Designer", "PM", "Analyst", "DevOps", "QA"}
allStatuses = []string{"Active", "Away", "Busy", "Offline"}
statusColors = map[string]tui.Color{
"Active": tui.Green,
"Away": tui.Yellow,
"Busy": tui.Red,
"Offline": tui.BrightBlack,
}
)
func randomPeople() []person {
n := 3 + rand.IntN(3)
used := map[int]bool{}
people := make([]person, 0, n)
for range n {
idx := rand.IntN(len(allNames))
for used[idx] {
idx = rand.IntN(len(allNames))
}
used[idx] = true
people = append(people, person{
Name: allNames[idx],
Role: allRoles[rand.IntN(len(allRoles))],
Status: allStatuses[rand.IntN(len(allStatuses))],
Score: 50 + rand.IntN(51),
})
}
return people
}
templ ReportCard(people []person) {
<div class="flex justify-center">
<div class="flex-col border-rounded w-3/4 px-1" borderStyle={tui.NewStyle().Foreground(tui.BrightCyan)}>
<span class="font-bold text-bright-magenta">Streaming Report</span>
<table>
<tr>
<th class="grow">Name</th>
<th class="grow">Role</th>
<th class="grow">Status</th>
<th>Score</th>
</tr>
<hr />
for _, p := range people {
<tr>
<td class="text-cyan grow">{p.Name}</td>
<td class="grow">{p.Role}</td>
<td class="grow" textStyle={tui.NewStyle().Foreground(statusColors[p.Status])}>{p.Status}</td>
<td class="font-bold">{fmt.Sprintf("%d", p.Score)}</td>
</tr>
}
</table>
</div>
</div>
}
// streamWithElement opens a StreamAbove writer, writes gradient intro text,
// inserts a styled card with a randomized table via WriteElement, then writes
// gradient outro text.
func (s *streamDemo) streamWithElement() {
if s.streaming.Get() {
return
}
s.streaming.Set(true)
go func() {
w := s.app.StreamAbove()
w.WriteGradient("Here's a summary:\n", gradient)
time.Sleep(100 * time.Millisecond)
w.WriteElement(ReportCard(randomPeople()))
time.Sleep(100 * time.Millisecond)
w.WriteGradient("Done!\n", gradient)
w.Close()
s.app.QueueUpdate(func() {
s.streaming.Set(false)
})
}()
}
// streamPhrase opens a StreamAbove writer, writes each character with a
// gradient color and a small delay, then closes the writer.
func (s *streamDemo) streamPhrase() {
if s.streaming.Get() {
return
}
s.streaming.Set(true)
text := phrases[s.phraseIdx%len(phrases)]
s.phraseIdx++
go func() {
w := s.app.StreamAbove()
for _, r := range text {
w.WriteGradient(string(r), gradient)
time.Sleep(30 * time.Millisecond)
}
w.Close()
s.app.QueueUpdate(func() {
s.streaming.Set(false)
})
}()
}
func (s *streamDemo) KeyMap() tui.KeyMap {
return tui.KeyMap{
tui.OnStop(tui.KeyEnter, func(ke tui.KeyEvent) { s.streamPhrase() }),
tui.OnStop(tui.KeyTab, func(ke tui.KeyEvent) { s.streamWithElement() }),
tui.On(tui.KeyEscape, func(ke tui.KeyEvent) { ke.App().Stop() }),
tui.On(tui.Rune('c').Ctrl(), func(ke tui.KeyEvent) { ke.App().Stop() }),
}
}
func (s *streamDemo) statusText() string {
if s.streaming.Get() {
return "streaming..."
}
return "Enter to stream | Tab to stream with element | Esc to quit"
}
templ (s *streamDemo) Render() {
<div class="border-rounded border-cyan items-center justify-center">
<span class="text-cyan">{s.statusText()}</span>
</div>
}
|