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ui: fix panic in selector when resizing terminal

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Fix panic when resizing the terminal by dynamically adjusting the width
of the option selector. The selector does not check the width of the
terminal before printing. This can lead to a panic in the account wizard
when reducing the terminal width.

If the terminal width is not large enough, the space between the options
is reduced. If this is still not enough, then the selector will only
show the focused option and arrows indicating the alternatives.

Fixes: https://todo.sr.ht/~rjarry/aerc/41
Reported-by: Omar Polo <op@omarpolo.com>
Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>
This commit is contained in:
Koni Marti 2022-05-07 05:29:43 +02:00 committed by Robin Jarry
parent b57fceaad4
commit 4a4050ee0f
1 changed files with 63 additions and 5 deletions
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68
widgets/selector.go
View file

@ -1,7 +1,10 @@
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"
@ -37,11 +40,44 @@ func (sel *Selector) Invalidate() {
}
func (sel *Selector) Draw(ctx *ui.Context) {
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ',
sel.uiConfig.GetStyle(config.STYLE_SELECTOR_DEFAULT))
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 := sel.uiConfig.GetStyle(config.STYLE_SELECTOR_DEFAULT)
style := defaultSelectorStyle
if sel.focus == i {
if sel.focused {
style = sel.uiConfig.GetStyle(config.STYLE_SELECTOR_FOCUSED)
@ -49,8 +85,30 @@ func (sel *Selector) Draw(ctx *ui.Context) {
style = sel.uiConfig.GetStyle(config.STYLE_SELECTOR_CHOOSER)
}
}
x += ctx.Printf(x, 1, style, "[%s]", option)
x += 5
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
}
}
}