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Working on TextArea Field

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This commit is contained in:
Brian Buller
2026-02-26 11:23:51 -06:00
parent d4ec3f210c
commit f18b53809d
2 changed files with 340 additions and 4 deletions
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4
wdgt_field.go
View File

@@ -188,9 +188,7 @@ func (w *Field) SetSize(c Coord) {
} }
func (w *Field) Focusable() bool { return w.focusable } func (w *Field) Focusable() bool { return w.focusable }
func (w *Field) SetFocusable(b bool) { w.focusable = b } func (w *Field) SetFocusable(b bool) { w.focusable = b }
func (w *Field) MinW() int { func (w *Field) MinW() int { return len(w.label) + len(w.value) }
return len(w.label) + len(w.value)
}
func (w *Field) MinH() int { return 1 } func (w *Field) MinH() int { return 1 }
/* Non-Widget-Interface Functions */ /* Non-Widget-Interface Functions */

338
wdgt_textarea_field.go Normal file
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@@ -0,0 +1,338 @@
/*
Copyright © Brian Buller <brian@bullercodeworks.com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
package widgets
import (
"fmt"
"strings"
wh "git.bullercodeworks.com/brian/tcell-widgets/helpers"
"github.com/gdamore/tcell"
)
type TextAreaField struct {
id string
style tcell.Style
label string
value string
overwriteMode bool
cursor int
visible bool
active bool
focusable bool
x, y int
w, h int
filter func(tcell.EventKey) bool
onChange func(prev, curr string)
keyMap *KeyMap
}
var _ Widget = (*TextAreaField)(nil)
func NewTextAreaField(id string, style tcell.Style) *TextAreaField {
f := &TextAreaField{}
f.Init(id, style)
return f
}
func (w *TextAreaField) Init(id string, style tcell.Style) {
w.id = id
w.style = style
w.visible = true
w.filter = func(ev tcell.EventKey) bool {
return wh.IsBS(ev) ||
wh.KeyIsDisplayable(ev) ||
wh.IsKey(tcell.KeyEnter)
}
w.keyMap = NewKeyMap(
NewKey(BuildEK(tcell.KeyLeft), w.handleLeft),
NewKey(BuildEK(tcell.KeyRight), w.handleRight),
NewKey(BuildEK(tcell.KeyUp), w.handleUp),
NewKey(BuildEK(tcell.KeyDown), w.handleDown),
NewKey(BuildEK(tcell.KeyHome), w.handleHome),
NewKey(BuildEK(tcell.KeyEnd), w.handleEnd),
NewKey(BuildEK(tcell.KeyCtrlU), w.clearValueBeforeCursor),
)
w.focusable = true
}
func (w *TextAreaField) Id() string { return w.id }
func (w *TextAreaField) HandleResize(ev *tcell.EventResize) { w.w, w.h = ev.Size() }
func (w *TextAreaField) GetKeyMap() *KeyMap { return w.keyMap }
func (w *TextAreaField) SetKeyMap(km *KeyMap) { w.keyMap = km }
func (w *TextAreaField) HandleKey(ev *tcell.EventKey) bool {
if !w.active {
return false
}
if wh.IsBS(*ev) {
if w.overwriteMode {
w.cursor--
return true
}
return w.handleBackspace(ev)
}
if wh.IsKey(tcell.KeyEnter) {
return w.handleEnter(ev)
}
if ev.Key() == tcell.KeyDelete {
if w.cursor < len(w.value) {
w.cursor++
return w.handleBackspace(ev)
}
}
if w.keyMap.Handle(ev) {
return true
}
if w.filter != nil && !w.filter(*ev) {
return false
}
if ev.Key() == tcell.KeyRune {
var val string
if w.overwriteMode {
if w.value[w.cursor] == '\n' {
// At a new line, we just insert
val = fmt.Sprintf("%s%s\n", w.value[:w.cursor-1], string(ev.Rune()))
} else {
val = fmt.Sprintf("%s%s", w.value[:w.cursor], string(ev.Rune()))
}
if len(w.value) > w.cursor+1 {
val = fmt.Sprintf("%s%s", val, w.value[w.cursor+1:])
}
} else {
val = fmt.Sprintf("%s%s%s", w.value[:w.cursor], string(ev.Rune()), w.value[w.cursor:])
}
w.SetValue(val)
w.cursor++
return true
}
return false
}
func (w *TextAreaField) HandleTime(ev *tcell.EventTime) {}
func (w *TextAreaField) Draw(screen tcell.Screen) {
if !w.visible {
return
}
useStyle := w.style.Dim(!w.active)
valueStyle := useStyle.Bold(w.active)
x, y := w.x, w.y
labelW := len(w.label)
if labelW > 0 {
wh.DrawText(w.x, w.y, w.label+": ", useStyle, screen)
x = x + labelW + 2
y++
}
lines := strings.Split(w.value, "\n")
var byteCount int
for li := range lines {
ll := len(lines[li])
if w.cursor >= byteCount && w.cursor < byteCount+ll {
// Cursor is on this line
crsPos := w.cursor - byteCount
cursor := " "
var pre, post string
if ll > 0 {
pre = lines[li][:crsPos]
if crsPos < ll {
cursor = string(lines[li][crsPos])
post = lines[li][crsPos+1:]
}
}
wh.DrawText(x, y, pre, valueStyle, screen)
x += len(pre)
if w.active {
wh.DrawText(x, y, cursor, valueStyle.Reverse(true).Blink(true), screen)
} else {
wh.DrawText(x, y, cursor, valueStyle, screen)
}
x += 1
wh.DrawText(x, y, post, valueStyle, screen)
} else {
// Cursor is not on this line
wh.DrawText(x, y, w.value[i], valueStyle, screen)
}
byteCount += ll
y++
x = w.x
}
}
func (w *TextAreaField) SetStyle(s tcell.Style) { w.style = s }
func (w *TextAreaField) Active() bool { return w.active }
func (w *TextAreaField) SetActive(a bool) bool {
w.active = a
return w.active
}
func (w *TextAreaField) Visible() bool { return w.visible }
func (w *TextAreaField) SetVisible(a bool) { w.visible = a }
func (w *TextAreaField) SetX(x int) { w.x = x }
func (w *TextAreaField) SetY(y int) { w.y = y }
func (w *TextAreaField) GetX() int { return w.x }
func (w *TextAreaField) GetY() int { return w.y }
func (w *TextAreaField) GetPos() Coord { return Coord{X: w.x, Y: w.y} }
func (w *TextAreaField) SetPos(c Coord) { w.x, w.y = c.X, c.Y }
func (w *TextAreaField) SetW(wd int) { w.w = wd }
func (w *TextAreaField) SetH(h int) { w.h = h }
func (w *TextAreaField) GetW() int { return w.w }
func (w *TextAreaField) GetH() int { return w.h }
func (w *TextAreaField) WantW() int {
vM := wh.Max(40, len(w.value))
if len(w.label) > 0 {
return len(w.label) + vM + 3
}
return vM
}
func (w *TextAreaField) WantH() int { return 1 }
func (w *TextAreaField) SetSize(c Coord) {
w.SetW(c.X)
w.SetH(c.Y)
}
func (w *TextAreaField) Focusable() bool { return w.focusable }
func (w *TextAreaField) SetFocusable(b bool) { w.focusable = b }
func (w *TextAreaField) MinW() int { return len(w.label) + len(w.value) }
func (w *TextAreaField) MinH() int { return 1 }
/* Non-Widget-Interface Functions */
func (w *TextAreaField) handleEnter(_ *tcell.EventKey) bool {
st := w.cursor
w.SetValue(w.value[:w.cursor] + "\n" + w.value[w.cursor+1:])
return true
}
func (w *TextAreaField) handleBackspace(_ *tcell.EventKey) bool {
st := w.cursor
if w.cursor > 0 {
w.cursor--
}
if w.cursor < len(w.value) {
w.SetValue(w.value[:w.cursor] + w.value[w.cursor+1:])
}
if st != w.cursor {
return true
}
return false
}
func (w *TextAreaField) getLine(n int) (string, error) {
if n < 0 {
return "", errors.New("invalid line specified")
}
pts := strings.Split(w.value, "\n")
if len(
}
func (w *TextAreaField) getCursorPosOnLine() (int, string) {
pts := strings.Split(w.value, "\n")
var wrk int
for i := range pts {
if w.cursor < wrk+len(pts[i]) {
return w.cursor - wrk, pts[i]
}
}
return -1, ""
}
func (w *TextAreaField) handleUp(ev *tcell.EventKey) bool {
// TODO: Split up value into lines, find current line, find equivilant 'x' on previous line
pos, ln := w.getCursorPosOnLine()
if pos == w.cursor {
w.cursor = 0
return true
}
return false
}
func (w *TextAreaField) handleDown(ev *tcell.EventKey) bool {
// TODO: Split up value into lines, find current line, find equivilant 'x' on next line
return false
}
func (w *TextAreaField) handleLeft(ev *tcell.EventKey) bool {
// TODO: Split up value into lines, find current line, if pos on line is 0, go to end of previous line
return false
}
func (w *TextAreaField) handleRight(ev *tcell.EventKey) bool {
// TODO: Split up value into lines, find current line, if pos on line is end, go to beg of next line
return false
}
func (w *TextAreaField) clearValueBeforeCursor(ev *tcell.EventKey) bool {
// TODO: Split up value into lines, find current line, clear before cursor
return true
}
func (w *TextAreaField) handleHome(ev *tcell.EventKey) bool {
// TODO: Split up value into lines, find current line, go to beg of it
w.cursorX = 0
return true
}
func (w *TextAreaField) handleEnd(ev *tcell.EventKey) bool {
// TODO: Split up value into lines, find current line, go to end of it
w.cursorX = len(w.value[w.cursorY])
return true
}
func (w *TextAreaField) SetLabel(l string) { w.label = l }
func (w *TextAreaField) Label() string { return w.label }
func (w *TextAreaField) SetValue(v string) {
prev := w.value
w.value = v
w.doOnChange(prev, v)
if w.cursor > len(v) {
w.cursor = len(v)
}
if w.cursor < 0 {
w.cursor = 0
}
}
func (w *TextAreaField) Value() string { return w.value }
func (w *TextAreaField) SetOnChange(v func(prev, curr string)) { w.onChange = v }
func (w *TextAreaField) doOnChange(prev, curr string) {
if w.onChange != nil {
w.onChange(prev, curr)
}
}
func (w *TextAreaField) SetFilter(f func(ev tcell.EventKey) bool) {
w.filter = func(ev tcell.EventKey) bool {
// We always want to make sure we allow backspace.
if wh.IsBS(ev) || wh.IsKey(tcell.KeyEnter) {
return true
}
// We also always want to make sure it's displayable
if !wh.KeyIsDisplayable(ev) {
return false
}
return f(ev)
}
}
func (w *TextAreaField) SetOverwrite(b bool) { w.overwriteMode = b }