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package widgets
import (
"fmt"
"github.com/gdamore/tcell/v2"
"github.com/mattn/go-runewidth"
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/ui"
)
type Selector struct {
ui.Invalidatable
chooser bool
focused bool
focus int
options []string
uiConfig config.UIConfig
onChoose func(option string)
onSelect func(option string)
}
func NewSelector(options []string, focus int, uiConfig config.UIConfig) *Selector {
return &Selector{
focus: focus,
options: options,
uiConfig: uiConfig,
}
}
func (sel *Selector) Chooser(chooser bool) *Selector {
sel.chooser = chooser
return sel
}
func (sel *Selector) Invalidate() {
sel.DoInvalidate(sel)
}
func (sel *Selector) Draw(ctx *ui.Context) {
defaultSelectorStyle := sel.uiConfig.GetStyle(config.STYLE_SELECTOR_DEFAULT)
w, h := ctx.Width(), ctx.Height()
ctx.Fill(0, 0, w, h, ' ', defaultSelectorStyle)
if w < 5 || h < 1 {
// if width and height are that small, don't even try to draw
// something
return
}
y := 1
if h == 1 {
y = 0
}
format := "[%s]"
calculateWidth := func(space int) int {
neededWidth := 2
for i, option := range sel.options {
neededWidth += runewidth.StringWidth(fmt.Sprintf(format, option))
if i < len(sel.options)-1 {
neededWidth += space
}
}
return neededWidth - space
}
space := 5
for ; space > 0; space-- {
if w > calculateWidth(space) {
break
}
}
x := 2
for i, option := range sel.options {
style := defaultSelectorStyle
if sel.focus == i {
if sel.focused {
style = sel.uiConfig.GetStyle(config.STYLE_SELECTOR_FOCUSED)
} else if sel.chooser {
style = sel.uiConfig.GetStyle(config.STYLE_SELECTOR_CHOOSER)
}
}
if space == 0 {
if sel.focus == i {
leftArrow, rightArrow := ' ', ' '
if i > 0 {
leftArrow = '❮'
}
if i < len(sel.options)-1 {
rightArrow = '❯'
}
s := runewidth.Truncate(option,
w-runewidth.RuneWidth(leftArrow)-runewidth.RuneWidth(rightArrow)-runewidth.StringWidth(fmt.Sprintf(format, "")),
"…")
nextPos := 0
nextPos += ctx.Printf(nextPos, y, defaultSelectorStyle, "%c", leftArrow)
nextPos += ctx.Printf(nextPos, y, style, format, s)
ctx.Printf(nextPos, y, defaultSelectorStyle, "%c", rightArrow)
}
} else {
x += ctx.Printf(x, y, style, format, option)
x += space
}
}
}
func (sel *Selector) OnChoose(fn func(option string)) *Selector {
sel.onChoose = fn
return sel
}
func (sel *Selector) OnSelect(fn func(option string)) *Selector {
sel.onSelect = fn
return sel
}
func (sel *Selector) Selected() string {
return sel.options[sel.focus]
}
func (sel *Selector) Focus(focus bool) {
sel.focused = focus
sel.Invalidate()
}
func (sel *Selector) Event(event tcell.Event) bool {
switch event := event.(type) {
case *tcell.EventKey:
switch event.Key() {
case tcell.KeyCtrlH:
fallthrough
case tcell.KeyLeft:
if sel.focus > 0 {
sel.focus--
sel.Invalidate()
}
if sel.onSelect != nil {
sel.onSelect(sel.Selected())
}
case tcell.KeyCtrlL:
fallthrough
case tcell.KeyRight:
if sel.focus < len(sel.options)-1 {
sel.focus++
sel.Invalidate()
}
if sel.onSelect != nil {
sel.onSelect(sel.Selected())
}
case tcell.KeyEnter:
if sel.onChoose != nil {
sel.onChoose(sel.Selected())
}
}
}
return false
}
|
