140 lines
2.9 KiB
Go
140 lines
2.9 KiB
Go
package ui
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import (
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"github.com/gdamore/tcell"
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"github.com/mattn/go-runewidth"
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)
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// TODO: Attach history and tab completion providers
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// TODO: scrolling
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type TextInput struct {
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Invalidatable
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cells int
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ctx *Context
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focus bool
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index int
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prompt string
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scroll int
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text []rune
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}
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// Creates a new TextInput. TextInputs will render a "textbox" in the entire
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// context they're given, and process keypresses to build a string from user
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// input.
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func NewTextInput(text string) *TextInput {
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return &TextInput{
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cells: -1,
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text: []rune(text),
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index: len([]rune(text)),
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}
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}
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func (ti *TextInput) Prompt(prompt string) *TextInput {
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ti.prompt = prompt
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return ti
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}
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func (ti *TextInput) String() string {
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return string(ti.text)
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}
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func (ti *TextInput) Invalidate() {
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ti.DoInvalidate(ti)
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}
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func (ti *TextInput) Draw(ctx *Context) {
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ti.ctx = ctx // gross
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
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ctx.Printf(0, 0, tcell.StyleDefault, "%s%s", ti.prompt, string(ti.text))
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cells := runewidth.StringWidth(string(ti.text[:ti.index]) + ti.prompt)
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if cells != ti.cells && ti.focus {
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ctx.SetCursor(cells, 0)
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}
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}
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func (ti *TextInput) Focus(focus bool) {
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ti.focus = focus
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if focus && ti.ctx != nil {
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cells := runewidth.StringWidth(string(ti.text[:ti.index]))
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ti.ctx.SetCursor(cells+1, 0)
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} else if !focus && ti.ctx != nil {
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ti.ctx.HideCursor()
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}
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}
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func (ti *TextInput) insert(ch rune) {
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left := ti.text[:ti.index]
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right := ti.text[ti.index:]
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ti.text = append(left, append([]rune{ch}, right...)...)
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ti.index++
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ti.Invalidate()
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}
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func (ti *TextInput) deleteWord() {
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// TODO: Break on any of / " '
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if len(ti.text) == 0 {
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return
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}
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i := ti.index - 1
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if ti.text[i] == ' ' {
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i--
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}
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for ; i >= 0; i-- {
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if ti.text[i] == ' ' {
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break
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}
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}
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ti.text = append(ti.text[:i+1], ti.text[ti.index:]...)
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ti.index = i + 1
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ti.Invalidate()
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}
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func (ti *TextInput) deleteChar() {
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if len(ti.text) > 0 && ti.index != len(ti.text) {
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ti.text = append(ti.text[:ti.index], ti.text[ti.index+1:]...)
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ti.Invalidate()
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}
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}
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func (ti *TextInput) backspace() {
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if len(ti.text) > 0 && ti.index != 0 {
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ti.text = append(ti.text[:ti.index-1], ti.text[ti.index:]...)
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ti.index--
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ti.Invalidate()
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}
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}
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func (ti *TextInput) Event(event tcell.Event) bool {
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switch event := event.(type) {
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case *tcell.EventKey:
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switch event.Key() {
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case tcell.KeyBackspace, tcell.KeyBackspace2:
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ti.backspace()
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case tcell.KeyCtrlD, tcell.KeyDelete:
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ti.deleteChar()
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case tcell.KeyCtrlB, tcell.KeyLeft:
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if ti.index > 0 {
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ti.index--
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ti.Invalidate()
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}
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case tcell.KeyCtrlF, tcell.KeyRight:
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if ti.index < len(ti.text) {
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ti.index++
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ti.Invalidate()
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}
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case tcell.KeyCtrlA, tcell.KeyHome:
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ti.index = 0
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ti.Invalidate()
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case tcell.KeyCtrlE, tcell.KeyEnd:
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ti.index = len(ti.text)
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ti.Invalidate()
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case tcell.KeyCtrlW:
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ti.deleteWord()
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case tcell.KeyRune:
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ti.insert(event.Rune())
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}
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}
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return true
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}
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