A lot of layout work
This commit is contained in:
229
wdgt_field.go
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229
wdgt_field.go
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/*
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Copyright © Brian Buller <brian@bullercodeworks.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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package widgets
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import (
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"fmt"
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wh "git.bullercodeworks.com/brian/tcell-widgets/helpers"
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"github.com/gdamore/tcell"
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)
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type Field struct {
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id string
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style tcell.Style
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label string
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value string
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cursor int
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visible bool
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active bool
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tabbable bool
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x, y int
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w, h int
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filter func(*tcell.EventKey) bool
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onChange func(prev, curr string)
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keyMap KeyMap
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}
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var _ Widget = (*Field)(nil)
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func NewField(id string, style tcell.Style) *Field {
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f := &Field{}
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f.Init(id, style)
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return f
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}
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func (w *Field) Init(id string, style tcell.Style) {
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w.id = id
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w.style = style
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w.visible = true
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w.filter = func(ev *tcell.EventKey) bool {
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return wh.IsBS(*ev) ||
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wh.KeyIsDisplayable(*ev)
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}
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w.keyMap = NewKeyMap(map[tcell.Key]func(ev *tcell.EventKey) bool{
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tcell.KeyLeft: w.handleLeft,
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tcell.KeyRight: w.handleRight,
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tcell.KeyHome: w.handleHome,
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tcell.KeyEnd: w.handleEnd,
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tcell.KeyCtrlU: w.clearValueBeforeCursor,
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})
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w.tabbable = true
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}
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func (w *Field) Id() string { return w.id }
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func (w *Field) HandleResize(ev *tcell.EventResize) {
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w.w, w.h = ev.Size()
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// w.w = wh.Min(w.w, w.WantW())
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// w.h = wh.Min(w.h, w.WantH())
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}
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func (w *Field) HandleKey(ev *tcell.EventKey) bool {
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if !w.active {
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return false
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}
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if wh.IsBS(*ev) {
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return w.handleBackspace(ev)
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}
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if ok := w.keyMap.Handle(ev); ok {
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return true
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}
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if w.filter != nil && !w.filter(ev) {
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return false
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}
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if ev.Key() == tcell.KeyRune {
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w.SetValue(fmt.Sprintf("%s%s%s", w.value[:w.cursor], string(ev.Rune()), w.value[w.cursor:]))
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w.cursor++
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return true
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}
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return false
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}
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func (w *Field) HandleTime(ev *tcell.EventTime) {}
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func (w *Field) Draw(screen tcell.Screen) {
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if !w.visible {
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return
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}
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useStyle := w.style
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if w.active {
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useStyle = w.style.Bold(true)
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}
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x := w.x
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labelW := len(w.label)
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if labelW > 0 {
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wh.DrawText(w.x, w.y, w.label+": ", useStyle, screen)
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x = x + labelW + 2
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}
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cursor := " "
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var pre, post string
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if len(w.value) > 0 {
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pre = w.value[:w.cursor]
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if w.cursor < len(w.value) {
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cursor = string(w.value[w.cursor])
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post = w.value[w.cursor+1:]
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}
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}
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wh.DrawText(x, w.y, pre, useStyle, screen)
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x += len(pre)
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if w.active {
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wh.DrawText(x, w.y, cursor, useStyle.Reverse(true).Blink(true), screen)
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} else {
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wh.DrawText(x, w.y, cursor, useStyle, screen)
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}
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x += 1
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wh.DrawText(x, w.y, post, useStyle, screen)
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}
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func (w *Field) Active() bool { return w.active }
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func (w *Field) SetActive(a bool) { w.active = a }
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func (w *Field) Visible() bool { return w.visible }
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func (w *Field) SetVisible(a bool) { w.visible = a }
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func (w *Field) SetX(x int) { w.x = x }
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func (w *Field) SetY(y int) { w.y = y }
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func (w *Field) GetX() int { return w.x }
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func (w *Field) GetY() int { return w.y }
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func (w *Field) GetPos() Coord { return Coord{X: w.x, Y: w.y} }
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func (w *Field) SetPos(c Coord) { w.x, w.y = c.X, c.Y }
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func (w *Field) SetW(wd int) { w.w = wd }
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func (w *Field) SetH(h int) { w.h = h }
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func (w *Field) GetW() int { return w.w }
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func (w *Field) GetH() int { return w.h }
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func (w *Field) WantW() int {
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return len(w.label) + 2 + len(w.value) + 1
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}
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func (w *Field) WantH() int {
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return 1
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}
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func (w *Field) SetSize(c Coord) { w.w, w.h = c.X, c.Y }
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func (w *Field) Focusable() bool { return true }
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func (w *Field) SetTabbable(b bool) { w.tabbable = b }
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func (w *Field) Tabbable() bool { return w.tabbable }
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func (w *Field) MinW() int { return len(w.label) + 15 }
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func (w *Field) MinH() int { return 1 }
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/* Non-Widget-Interface Functions */
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func (w *Field) handleBackspace(_ *tcell.EventKey) bool {
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st := w.cursor
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if w.cursor > 0 {
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w.cursor--
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}
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if w.cursor < len(w.value) {
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w.SetValue(w.value[:w.cursor] + w.value[w.cursor+1:])
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}
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if st != w.cursor {
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return true
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}
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return false
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}
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func (w *Field) handleLeft(ev *tcell.EventKey) bool {
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if w.cursor > 0 {
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w.cursor--
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return true
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}
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return false
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}
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func (w *Field) handleRight(ev *tcell.EventKey) bool {
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if w.cursor < len(w.value) {
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w.cursor++
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return true
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}
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return false
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}
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func (w *Field) clearValueBeforeCursor(ev *tcell.EventKey) bool {
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w.SetValue(w.value[w.cursor:])
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w.cursor = 0
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return true
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}
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func (w *Field) handleHome(ev *tcell.EventKey) bool {
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w.cursor = 0
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return true
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}
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func (w *Field) handleEnd(ev *tcell.EventKey) bool {
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w.cursor = len(w.value)
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return true
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}
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func (w *Field) SetLabel(l string) { w.label = l }
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func (w *Field) Label() string { return w.label }
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func (w *Field) SetValue(v string) {
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prev := w.value
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w.value = v
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w.doOnChange(prev, v)
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}
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func (w *Field) Value() string { return w.value }
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func (w *Field) SetOnChange(v func(prev, curr string)) { w.onChange = v }
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func (w *Field) doOnChange(prev, curr string) {
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if w.onChange != nil {
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w.onChange(prev, curr)
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}
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}
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