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|
package main
import (
"fmt"
"math"
tui "github.com/grindlemire/go-tui"
)
type feedApp struct {
messages *tui.State[[]string]
paused *tui.State[bool]
scrollY *tui.State[int]
stickToBottom *tui.State[bool]
content *tui.Ref
mode string
}
func NewFeedApp(mode string) *feedApp {
return &feedApp{
messages: tui.NewState([]string{}),
paused: tui.NewState(false),
scrollY: tui.NewState(0),
stickToBottom: tui.NewState(false),
content: tui.NewRef(),
mode: mode,
}
}
func (f *feedApp) scrollBy(delta int) {
el := f.content.El()
if el == nil {
return
}
// Read actual position from element, not from state (state may be math.MaxInt).
_, curY := el.ScrollOffset()
_, maxY := el.MaxScroll()
newY := curY + delta
if newY < 0 {
newY = 0
} else if newY > maxY {
newY = maxY
}
f.scrollY.Set(newY)
f.stickToBottom.Set(false)
}
func (f *feedApp) KeyMap() tui.KeyMap {
return tui.KeyMap{
tui.OnStop(tui.KeyEscape, func(ke tui.KeyEvent) { ke.App().Stop() }),
tui.OnStop(tui.Rune('q'), func(ke tui.KeyEvent) { ke.App().Stop() }),
tui.OnStop(tui.Rune('p'), func(ke tui.KeyEvent) {
f.paused.Set(!f.paused.Get())
}),
tui.OnStop(tui.Rune('s'), func(ke tui.KeyEvent) {
if f.stickToBottom.Get() {
// Turning off: capture actual scroll position so scrollY
// is no longer math.MaxInt (which would keep following the bottom).
if el := f.content.El(); el != nil {
_, y := el.ScrollOffset()
f.scrollY.Set(y)
}
f.stickToBottom.Set(false)
} else {
f.stickToBottom.Set(true)
}
}),
tui.On(tui.Rune('j'), func(ke tui.KeyEvent) { f.scrollBy(1) }),
tui.On(tui.Rune('k'), func(ke tui.KeyEvent) { f.scrollBy(-1) }),
tui.On(tui.KeyUp, func(ke tui.KeyEvent) { f.scrollBy(-1) }),
tui.On(tui.KeyDown, func(ke tui.KeyEvent) { f.scrollBy(1) }),
tui.On(tui.KeyPageUp, func(ke tui.KeyEvent) { f.scrollBy(-10) }),
tui.On(tui.KeyPageDown, func(ke tui.KeyEvent) { f.scrollBy(10) }),
tui.On(tui.KeyHome, func(ke tui.KeyEvent) {
f.scrollY.Set(0)
f.stickToBottom.Set(false)
}),
}
}
func (f *feedApp) HandleMouse(me tui.MouseEvent) bool {
switch me.Button {
case tui.MouseWheelUp:
f.scrollBy(-1)
return true
case tui.MouseWheelDown:
f.scrollBy(1)
return true
}
return false
}
func (f *feedApp) AddMessage(msg string) {
f.messages.Update(func(msgs []string) []string {
return append(msgs, msg)
})
if f.stickToBottom.Get() {
f.scrollY.Set(math.MaxInt)
}
}
func (f *feedApp) IsPaused() bool {
return f.paused.Get()
}
func pauseLabel(paused bool) string {
if paused {
return "PAUSED"
}
return "LIVE"
}
func pauseClass(paused bool) string {
if paused {
return "text-yellow font-bold"
}
return "text-green font-bold"
}
func stickyLabel(sticky bool) string {
if sticky {
return "STICKY"
}
return "FREE"
}
func stickyClass(sticky bool) string {
if sticky {
return "text-cyan font-bold"
}
return "text-yellow"
}
templ (f *feedApp) Render() {
<div class="flex-col h-full border-rounded border-cyan">
<div class="flex justify-between px-1 shrink-0">
<span class="text-gradient-cyan-magenta font-bold">Event Loop Demo</span>
<div class="flex gap-1">
<span class="font-dim">mode:</span>
<span class="text-cyan font-bold">{f.mode}</span>
</div>
</div>
<hr />
<div
ref={f.content}
class="flex-col flex-grow border-single p-1"
scrollable={tui.ScrollVertical}
scrollOffset={0, f.scrollY.Get()}
>
for _, msg := range f.messages.Get() {
<span class="font-dim">{msg}</span>
}
</div>
<hr />
<div class="flex justify-between px-1 shrink-0">
<div class="flex gap-2">
<span class="font-dim">p: pause</span>
<span class="font-dim">s: sticky</span>
<span class="font-dim">j/k: scroll</span>
<span class="font-dim">q: quit</span>
</div>
<div class="flex gap-2">
<span class={pauseClass(f.paused.Get())}>{pauseLabel(f.paused.Get())}</span>
<span class={stickyClass(f.stickToBottom.Get())}>{stickyLabel(f.stickToBottom.Get())}</span>
<span class="font-dim">{fmt.Sprintf("%d msgs", len(f.messages.Get()))}</span>
</div>
</div>
</div>
}
|