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Implement scrolling in text input

This commit is contained in:
Drew DeVault 2019-05-25 15:52:37 -04:00
parent 38e71659ff
commit 9947ea125c
1 changed files with 31 additions and 3 deletions
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34
lib/ui/textinput.go
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@ -56,16 +56,23 @@ func (ti *TextInput) Invalidate() {
}
func (ti *TextInput) Draw(ctx *Context) {
scroll := ti.scroll
if !ti.focus {
scroll = 0
}
ti.ctx = ctx // gross
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
text := string(ti.text[scroll:])
sindex := ti.index - scroll
if ti.password {
x := ctx.Printf(0, 0, tcell.StyleDefault, "%s", ti.prompt)
cells := runewidth.StringWidth(string(ti.text))
cells := runewidth.StringWidth(string(text))
ctx.Fill(x, 0, cells, 1, '*', tcell.StyleDefault)
} else {
ctx.Printf(0, 0, tcell.StyleDefault, "%s%s", ti.prompt, string(ti.text))
ctx.Printf(0, 0, tcell.StyleDefault, "%s%s", ti.prompt, text)
}
cells := runewidth.StringWidth(string(ti.text[:ti.index]) + ti.prompt)
cells := runewidth.StringWidth(text[:sindex] + ti.prompt)
if ti.focus {
ctx.SetCursor(cells, 0)
}
@ -81,11 +88,25 @@ func (ti *TextInput) Focus(focus bool) {
}
}
func (ti *TextInput) ensureScroll() {
if ti.ctx == nil {
return
}
// God why am I this lazy
for ti.index-ti.scroll >= ti.ctx.Width() {
ti.scroll++
}
for ti.index-ti.scroll < 0 {
ti.scroll--
}
}
func (ti *TextInput) insert(ch rune) {
left := ti.text[:ti.index]
right := ti.text[ti.index:]
ti.text = append(left, append([]rune{ch}, right...)...)
ti.index++
ti.ensureScroll()
ti.Invalidate()
ti.onChange()
}
@ -106,6 +127,7 @@ func (ti *TextInput) deleteWord() {
}
ti.text = append(ti.text[:i+1], ti.text[ti.index:]...)
ti.index = i + 1
ti.ensureScroll()
ti.Invalidate()
ti.onChange()
}
@ -113,6 +135,7 @@ func (ti *TextInput) deleteWord() {
func (ti *TextInput) deleteChar() {
if len(ti.text) > 0 && ti.index != len(ti.text) {
ti.text = append(ti.text[:ti.index], ti.text[ti.index+1:]...)
ti.ensureScroll()
ti.Invalidate()
ti.onChange()
}
@ -122,6 +145,7 @@ func (ti *TextInput) backspace() {
if len(ti.text) > 0 && ti.index != 0 {
ti.text = append(ti.text[:ti.index-1], ti.text[ti.index:]...)
ti.index--
ti.ensureScroll()
ti.Invalidate()
ti.onChange()
}
@ -148,18 +172,22 @@ func (ti *TextInput) Event(event tcell.Event) bool {
case tcell.KeyCtrlB, tcell.KeyLeft:
if ti.index > 0 {
ti.index--
ti.ensureScroll()
ti.Invalidate()
}
case tcell.KeyCtrlF, tcell.KeyRight:
if ti.index < len(ti.text) {
ti.index++
ti.ensureScroll()
ti.Invalidate()
}
case tcell.KeyCtrlA, tcell.KeyHome:
ti.index = 0
ti.ensureScroll()
ti.Invalidate()
case tcell.KeyCtrlE, tcell.KeyEnd:
ti.index = len(ti.text)
ti.ensureScroll()
ti.Invalidate()
case tcell.KeyCtrlW:
ti.deleteWord()