package app 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) }