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entry.go
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entry.go
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package tui
import (
"image"
)
var _ Widget = &Entry{}
// Entry is a one-line text editor. It lets the user supply the application
// with text, e.g., to input user and password information.
type Entry struct {
WidgetBase
text RuneBuffer
onTextChange func(*Entry)
onSubmit func(*Entry)
offset int
}
// NewEntry returns a new Entry.
func NewEntry() *Entry {
return &Entry{}
}
// Draw draws the entry.
func (e *Entry) Draw(p *Painter) {
style := "entry"
if e.IsFocused() {
style += ".focused"
}
p.WithStyle(style, func(p *Painter) {
s := e.Size()
text := e.visibleText()
p.FillRect(0, 0, s.X, 1)
p.DrawText(0, 0, text)
if e.IsFocused() {
pos := e.text.CursorPos(s.X)
p.DrawCursor(pos.X-e.offset, 0)
}
})
}
// SizeHint returns the recommended size hint for the entry.
func (e *Entry) SizeHint() image.Point {
return image.Point{10, 1}
}
// OnKeyEvent handles key events.
func (e *Entry) OnKeyEvent(ev KeyEvent) {
if !e.IsFocused() {
return
}
if ev.Key != KeyRune {
switch ev.Key {
case KeyEnter:
if e.onSubmit != nil {
e.onSubmit(e)
}
case KeyBackspace2:
e.text.Backspace()
if e.offset > 0 && !e.isTextRemaining() {
e.offset--
}
if e.onTextChange != nil {
e.onTextChange(e)
}
case KeyDelete, KeyCtrlD:
e.text.Delete()
if e.onTextChange != nil {
e.onTextChange(e)
}
case KeyLeft, KeyCtrlB:
e.text.MoveBackward()
if e.offset > 0 {
e.offset--
}
case KeyRight, KeyCtrlF:
e.text.MoveForward()
screenWidth := e.Size().X
isCursorTooFar := e.text.CursorPos(screenWidth).X >= screenWidth
isTextLeft := (e.text.Width() - e.offset) > (screenWidth - 1)
if isCursorTooFar && isTextLeft {
e.offset++
}
case KeyHome, KeyCtrlA:
e.text.MoveToLineStart()
e.offset = 0
case KeyEnd, KeyCtrlE:
e.text.MoveToLineEnd()
left := e.text.Width() - (e.Size().X - 1)
if left >= 0 {
e.offset = left
}
case KeyCtrlK:
e.text.Kill()
}
return
}
e.text.WriteRune(ev.Rune)
if e.text.CursorPos(e.Size().X).X >= e.Size().X {
e.offset++
}
if e.onTextChange != nil {
e.onTextChange(e)
}
}
// OnChanged sets a function to be run whenever the content of the entry has
// been changed.
func (e *Entry) OnChanged(fn func(entry *Entry)) {
e.onTextChange = fn
}
// OnSubmit sets a function to be run whenever the user submits the entry (by
// pressing KeyEnter).
func (e *Entry) OnSubmit(fn func(entry *Entry)) {
e.onSubmit = fn
}
// SetText sets the text content of the entry.
func (e *Entry) SetText(text string) {
e.text.Set([]rune(text))
}
// Text returns the text content of the entry.
func (e *Entry) Text() string {
return e.text.String()
}
func (e *Entry) visibleText() string {
text := e.text.String()
if text == "" {
return ""
}
windowStart := e.offset
windowEnd := e.Size().X + windowStart
if windowEnd > len(text) {
windowEnd = len(text)
}
return text[windowStart:windowEnd]
}
func (e *Entry) isTextRemaining() bool {
return e.text.Width()-e.offset > e.Size().X
}