aerc/lib/ui/textinput.go -rw-r--r-- 6.6 KiB View raw
                                                                                
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package ui

import (
	"github.com/gdamore/tcell"
	"github.com/mattn/go-runewidth"
)

// TODO: Attach history providers
// TODO: scrolling

type TextInput struct {
	Invalidatable
	cells         int
	ctx           *Context
	focus         bool
	index         int
	password      bool
	prompt        string
	scroll        int
	text          []rune
	change        []func(ti *TextInput)
	tabcomplete   func(s string) []string
	completions   []string
	completeIndex int
}

// Creates a new TextInput. TextInputs will render a "textbox" in the entire
// context they're given, and process keypresses to build a string from user
// input.
func NewTextInput(text string) *TextInput {
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return &TextInput{ cells: -1, text: []rune(text), index: len([]rune(text)), } } func (ti *TextInput) Password(password bool) *TextInput {
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ti.password = password return ti } func (ti *TextInput) Prompt(prompt string) *TextInput {
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ti.prompt = prompt return ti } func (ti *TextInput) TabComplete(
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tabcomplete func(s string) []string) *TextInput { ti.tabcomplete = tabcomplete return ti } func (ti *TextInput) String() string {
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return string(ti.text) } func (ti *TextInput) StringLeft() string {
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return string(ti.text[:ti.index]) } func (ti *TextInput) StringRight() string {
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return string(ti.text[ti.index:]) } func (ti *TextInput) Set(value string) {
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ti.text = []rune(value) ti.index = len(ti.text) } func (ti *TextInput) Invalidate() {
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ti.DoInvalidate(ti) } func (ti *TextInput) Draw(ctx *Context) {
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scroll := ti.scroll if !ti.focus { scroll = 0 } else { ti.ensureScroll() } ti.ctx = ctx // gross ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault) text := ti.text[scroll:] sindex := ti.index - scroll if ti.password { x := ctx.Printf(0, 0, tcell.StyleDefault, "%s", ti.prompt) 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(text)) } cells := runewidth.StringWidth(string(text[:sindex]) + ti.prompt) if ti.focus { ctx.SetCursor(cells, 0) } } func (ti *TextInput) MouseEvent(localX int, localY int, event tcell.Event) {
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switch event := event.(type) { case *tcell.EventMouse: switch event.Buttons() { case tcell.Button1: if localX >= len(ti.prompt)+1 && localX <= len(ti.text[ti.scroll:])+len(ti.prompt)+1 { ti.index = localX - len(ti.prompt) - 1 ti.ensureScroll() ti.Invalidate() } } } } func (ti *TextInput) Focus(focus bool) {
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ti.focus = focus if focus && ti.ctx != nil { cells := runewidth.StringWidth(string(ti.text[:ti.index])) ti.ctx.SetCursor(cells+1, 0) } else if !focus && ti.ctx != nil { ti.ctx.HideCursor() } } func (ti *TextInput) ensureScroll() {
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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) {
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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() } func (ti *TextInput) deleteWord() {
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// TODO: Break on any of / " ' if len(ti.text) == 0 { return } i := ti.index - 1 if ti.text[i] == ' ' { i-- } for ; i >= 0; i-- { if ti.text[i] == ' ' { break } } ti.text = append(ti.text[:i+1], ti.text[ti.index:]...) ti.index = i + 1 ti.ensureScroll() ti.Invalidate() ti.onChange() } func (ti *TextInput) deleteLineForward() {
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if len(ti.text) == 0 || len(ti.text) == ti.index { return } ti.text = ti.text[:ti.index] ti.ensureScroll() ti.Invalidate() ti.onChange() } func (ti *TextInput) deleteLineBackward() {
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if len(ti.text) == 0 || ti.index == 0 { return } ti.text = ti.text[ti.index:] ti.index = 0 ti.ensureScroll() ti.Invalidate() ti.onChange() } func (ti *TextInput) deleteChar() {
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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() } } func (ti *TextInput) backspace() {
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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() } } func (ti *TextInput) nextCompletion() {
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if ti.completions == nil { if ti.tabcomplete == nil { return } ti.completions = ti.tabcomplete(ti.StringLeft()) ti.completeIndex = 0 } else { ti.completeIndex++ if ti.completeIndex >= len(ti.completions) { ti.completeIndex = 0 } } if len(ti.completions) > 0 { ti.Set(ti.completions[ti.completeIndex] + ti.StringRight()) } } func (ti *TextInput) previousCompletion() {
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if ti.completions == nil || len(ti.completions) == 0 { return } ti.completeIndex-- if ti.completeIndex < 0 { ti.completeIndex = len(ti.completions) - 1 } if len(ti.completions) > 0 { ti.Set(ti.completions[ti.completeIndex] + ti.StringRight()) } } func (ti *TextInput) invalidateCompletions() {
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ti.completions = nil } func (ti *TextInput) onChange() {
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for _, change := range ti.change { change(ti) } } func (ti *TextInput) OnChange(onChange func(ti *TextInput)) {
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ti.change = append(ti.change, onChange) } func (ti *TextInput) Event(event tcell.Event) bool {
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switch event := event.(type) { case *tcell.EventKey: switch event.Key() { case tcell.KeyBackspace, tcell.KeyBackspace2: ti.invalidateCompletions() ti.backspace() case tcell.KeyCtrlD, tcell.KeyDelete: ti.invalidateCompletions() ti.deleteChar() case tcell.KeyCtrlB, tcell.KeyLeft: ti.invalidateCompletions() if ti.index > 0 { ti.index-- ti.ensureScroll() ti.Invalidate() } case tcell.KeyCtrlF, tcell.KeyRight: ti.invalidateCompletions() if ti.index < len(ti.text) { ti.index++ ti.ensureScroll() ti.Invalidate() } case tcell.KeyCtrlA, tcell.KeyHome: ti.invalidateCompletions() ti.index = 0 ti.ensureScroll() ti.Invalidate() case tcell.KeyCtrlE, tcell.KeyEnd: ti.invalidateCompletions() ti.index = len(ti.text) ti.ensureScroll() ti.Invalidate() case tcell.KeyCtrlK: ti.invalidateCompletions() ti.deleteLineForward() case tcell.KeyCtrlW: ti.invalidateCompletions() ti.deleteWord() case tcell.KeyCtrlU: ti.invalidateCompletions() ti.deleteLineBackward() case tcell.KeyTab: if ti.tabcomplete != nil { ti.nextCompletion() } else { ti.insert('\t') } ti.Invalidate() case tcell.KeyBacktab: if ti.tabcomplete != nil { ti.previousCompletion() } ti.Invalidate() case tcell.KeyRune: ti.invalidateCompletions() ti.insert(event.Rune()) } } return true }