package widgets
import (
"math"
"strings"
"sync"
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/log"
"github.com/gdamore/tcell/v2"
"github.com/mattn/go-runewidth"
)
type ListBox struct {
Scrollable
title string
lines []string
selected string
cursorPos int
horizPos int
jump int
showCursor bool
showFilter bool
filterMutex sync.Mutex
filter *ui.TextInput
uiConfig *config.UIConfig
cb func(string)
}
func NewListBox(title string, lines []string, uiConfig *config.UIConfig, cb func(string)) *ListBox {
lb := &ListBox{
title: title,
lines: lines,
cursorPos: -1,
jump: -1,
uiConfig: uiConfig,
cb: cb,
filter: ui.NewTextInput("", uiConfig),
}
lb.filter.OnChange(func(ti *ui.TextInput) {
var show bool
if ti.String() == "" {
show = false
} else {
show = true
}
lb.setShowFilterField(show)
lb.filter.Focus(show)
lb.Invalidate()
})
lb.dedup()
return lb
}
func (lb *ListBox) dedup() {
dedupped := make([]string, 0, len(lb.lines))
dedup := make(map[string]struct{})
for _, line := range lb.lines {
if _, dup := dedup[line]; dup {
log.Warnf("ignore duplicate: %s", line)
continue
}
dedup[line] = struct{}{}
dedupped = append(dedupped, line)
}
lb.lines = dedupped
}
func (lb *ListBox) setShowFilterField(b bool) {
lb.filterMutex.Lock()
defer lb.filterMutex.Unlock()
lb.showFilter = b
}
func (lb *ListBox) showFilterField() bool {
lb.filterMutex.Lock()
defer lb.filterMutex.Unlock()
return lb.showFilter
}
func (lb *ListBox) Draw(ctx *ui.Context) {
defaultStyle := lb.uiConfig.GetStyle(config.STYLE_DEFAULT)
titleStyle := lb.uiConfig.GetStyle(config.STYLE_TITLE)
w, h := ctx.Width(), ctx.Height()
ctx.Fill(0, 0, w, h, ' ', defaultStyle)
ctx.Fill(0, 0, w, 1, ' ', titleStyle)
ctx.Printf(0, 0, titleStyle, "%s", lb.title)
y := 0
if lb.showFilterField() {
y = 1
x := ctx.Printf(0, y, defaultStyle, "Filter: ")
lb.filter.Draw(ctx.Subcontext(x, y, w-x, 1))
}
lb.drawBox(ctx.Subcontext(0, y+1, w, h-(y+1)))
}
func (lb *ListBox) moveCursor(delta int) {
list := lb.filtered()
if len(list) == 0 {
return
}
lb.cursorPos += delta
if lb.cursorPos < 0 {
lb.cursorPos = 0
}
if lb.cursorPos >= len(list) {
lb.cursorPos = len(list) - 1
}
lb.selected = list[lb.cursorPos]
lb.showCursor = true
lb.horizPos = 0
}
func (lb *ListBox) moveHorizontal(delta int) {
lb.horizPos += delta
if lb.horizPos > len(lb.selected) {
lb.horizPos = len(lb.selected)
}
if lb.horizPos < 0 {
lb.horizPos = 0
}
}
func (lb *ListBox) filtered() []string {
list := []string{}
filterTerm := lb.filter.String()
for _, line := range lb.lines {
if strings.Contains(line, filterTerm) {
list = append(list, line)
}
}
return list
}
func (lb *ListBox) drawBox(ctx *ui.Context) {
defaultStyle := lb.uiConfig.GetStyle(config.STYLE_DEFAULT)
selectedStyle := lb.uiConfig.GetComposedStyleSelected(config.STYLE_MSGLIST_DEFAULT, nil)
w, h := ctx.Width(), ctx.Height()
lb.jump = h
list := lb.filtered()
lb.UpdateScroller(ctx.Height(), len(list))
scroll := 0
lb.cursorPos = -1
for i := 0; i < len(list); i++ {
if lb.selected == list[i] {
scroll = i
lb.cursorPos = i
break
}
}
lb.EnsureScroll(scroll)
needScrollbar := lb.NeedScrollbar()
if needScrollbar {
w -= 1
if w < 0 {
w = 0
}
}
if lb.lines == nil || len(list) == 0 {
return
}
y := 0
for i := lb.Scroll(); i < len(list) && y < h; i++ {
style := defaultStyle
line := runewidth.Truncate(list[i], w-1, "❯")
if lb.selected == list[i] && lb.showCursor {
style = selectedStyle
if len(list[i]) > w {
if len(list[i])-lb.horizPos < w {
lb.horizPos = len(list[i]) - w + 1
}
rest := list[i][lb.horizPos:]
line = runewidth.Truncate(rest,
w-1, "❯")
if lb.horizPos > 0 && len(line) > 0 {
line = "❮" + line[1:]
}
}
}
ctx.Printf(1, y, style, line)
y += 1
}
if needScrollbar {
scrollBarCtx := ctx.Subcontext(w, 0, 1, ctx.Height())
lb.drawScrollbar(scrollBarCtx)
}
}
func (lb *ListBox) drawScrollbar(ctx *ui.Context) {
gutterStyle := tcell.StyleDefault
pillStyle := tcell.StyleDefault.Reverse(true)
// gutter
h := ctx.Height()
ctx.Fill(0, 0, 1, h, ' ', gutterStyle)
// pill
pillSize := int(math.Ceil(float64(h) * lb.PercentVisible()))
pillOffset := int(math.Floor(float64(h) * lb.PercentScrolled()))
ctx.Fill(0, pillOffset, 1, pillSize, ' ', pillStyle)
}
func (lb *ListBox) Invalidate() {
ui.Invalidate()
}
func (lb *ListBox) Event(event tcell.Event) bool {
if event, ok := event.(*tcell.EventKey); ok {
switch event.Key() {
case tcell.KeyLeft:
lb.moveHorizontal(-1)
lb.Invalidate()
return true
case tcell.KeyRight:
lb.moveHorizontal(+1)
lb.Invalidate()
return true
case tcell.KeyCtrlB:
line := lb.selected[:lb.horizPos]
fds := strings.Fields(line)
if len(fds) > 1 {
lb.moveHorizontal(
strings.LastIndex(line,
fds[len(fds)-1]) - lb.horizPos - 1)
} else {
lb.horizPos = 0
}
lb.Invalidate()
return true
case tcell.KeyCtrlW:
line := lb.selected[lb.horizPos+1:]
fds := strings.Fields(line)
if len(fds) > 1 {
lb.moveHorizontal(strings.Index(line, fds[1]))
}
lb.Invalidate()
return true
case tcell.KeyCtrlA, tcell.KeyHome:
lb.horizPos = 0
lb.Invalidate()
return true
case tcell.KeyCtrlE, tcell.KeyEnd:
lb.horizPos = len(lb.selected)
lb.Invalidate()
return true
case tcell.KeyCtrlP, tcell.KeyUp:
lb.moveCursor(-1)
lb.Invalidate()
return true
case tcell.KeyCtrlN, tcell.KeyDown:
lb.moveCursor(+1)
lb.Invalidate()
return true
case tcell.KeyPgUp:
if lb.jump >= 0 {
lb.moveCursor(-lb.jump)
lb.Invalidate()
}
return true
case tcell.KeyPgDn:
if lb.jump >= 0 {
lb.moveCursor(+lb.jump)
lb.Invalidate()
}
return true
case tcell.KeyEnter:
return lb.quit(lb.selected)
case tcell.KeyEsc:
return lb.quit("")
}
}
if lb.filter != nil {
handled := lb.filter.Event(event)
lb.Invalidate()
return handled
}
return false
}
func (lb *ListBox) quit(s string) bool {
lb.filter.Focus(false)
if lb.cb != nil {
lb.cb(s)
}
return true
}
func (lb *ListBox) Focus(f bool) {
lb.filter.Focus(f)
}
