74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
package tui
|
|
|
|
import "github.com/lixenwraith/terminal"
|
|
|
|
// Radio draws options as radio buttons in a row at (x, y): the chosen one
|
|
// with the On glyph in the accent style, the rest with Off, muted ("○ raw
|
|
// ● txt ○ json"); chosen -1 marks none. Where the row does not fit, it shows
|
|
// the options around the chosen one, a muted '…' where others are hidden.
|
|
// It returns the columns it drew.
|
|
func (r Region) Radio(x, y int, options []string, chosen int, th Theme) int {
|
|
width := func(lo, hi int) int { // the window [lo, hi), its '…' marks included
|
|
w := -2
|
|
for _, o := range options[lo:hi] {
|
|
w += RuneLen(o) + 4
|
|
}
|
|
return w + 2*min(lo, 1) + 3*min(len(options)-hi, 1)
|
|
}
|
|
lo, hi := 0, len(options)
|
|
if width(lo, hi) > r.W-x && hi > 0 {
|
|
lo = max(0, min(chosen, hi-1))
|
|
hi = lo + 1
|
|
for grown := true; grown; {
|
|
grown = false
|
|
if hi < len(options) && width(lo, hi+1) <= r.W-x {
|
|
hi, grown = hi+1, true
|
|
}
|
|
if lo > 0 && width(lo-1, hi) <= r.W-x {
|
|
lo, grown = lo-1, true
|
|
}
|
|
}
|
|
}
|
|
start := x
|
|
if lo > 0 {
|
|
r.TextStyled(x, y, "…", th.Muted)
|
|
x += 2
|
|
}
|
|
for i := lo; i < hi; i++ {
|
|
mark, style := th.Glyphs.Off, th.Muted
|
|
if i == chosen {
|
|
mark, style = th.Glyphs.On, th.Accent
|
|
}
|
|
r.TextStyled(x, y, Truncate(string(mark)+" "+options[i], max(0, r.W-x)), style)
|
|
x += RuneLen(options[i]) + 4
|
|
}
|
|
if hi < len(options) {
|
|
r.TextStyled(x, y, "…", th.Muted)
|
|
x += 3
|
|
}
|
|
return max(0, min(x-2, r.W)-start)
|
|
}
|
|
|
|
// StepChoice moves a choice among n options on Left or Right (h, l),
|
|
// stopping at either end, and reports whether it moved
|
|
func StepChoice(key terminal.Key, r rune, chosen, n int) (int, bool) {
|
|
switch {
|
|
case (key == terminal.KeyLeft || key == terminal.KeyRune && r == 'h') && chosen > 0:
|
|
return chosen - 1, true
|
|
case (key == terminal.KeyRight || key == terminal.KeyRune && r == 'l') && chosen < n-1:
|
|
return chosen + 1, true
|
|
}
|
|
return chosen, false
|
|
}
|
|
|
|
// Toggle draws a switch at (x, y): the On glyph and "on" in the accent
|
|
// style, or the Off glyph and "off" muted, and returns the columns it drew
|
|
func (r Region) Toggle(x, y int, on bool, th Theme) int {
|
|
label, style := string(th.Glyphs.Off)+" off", th.Muted
|
|
if on {
|
|
label, style = string(th.Glyphs.On)+" on", th.Accent
|
|
}
|
|
r.TextStyled(x, y, label, style)
|
|
return RuneLen(label)
|
|
}
|