ref: bee85da05585c5f6d73208d10659f5860d3d8524
dir: /field/field.go/
package field
import (
"9fans.net/go/draw"
"9fans.net/go/draw/memdraw"
//"fmt"
"image"
"log"
"slices"
"sync"
"github.com/psilva261/xui"
"github.com/psilva261/xui/events"
"github.com/psilva261/xui/events/keyboard"
"github.com/psilva261/xui/events/mouse"
"github.com/psilva261/xui/font"
"github.com/psilva261/xui/internal/color"
"github.com/psilva261/xui/internal/geom"
"github.com/psilva261/xui/layout"
"github.com/psilva261/xui/space"
)
const (
Backspace rune = 8
)
type Interface interface {
}
type Field struct {
mu sync.RWMutex
Orig image.Point
image.Rectangle
x xui.Interface
Text string
color.Colorset
// Position of the cursor
Pos int
// Position of the selection
Pos2 int
// Offsets of the characters
Offsets []int
textImg *memdraw.Image
borderImg *memdraw.Image
hoverImg *memdraw.Image
hover bool
cb func(ev events.Interface, userData any)
cbUserData any
Margin space.Sp
}
func New(x xui.Interface, orig image.Point, text string, r image.Rectangle) (f *Field) {
f = &Field{}
f.Orig = orig
f.Text = text
f.Rectangle = r
f.x = x
f.Colorset.Normal.Border = color.Border
f.Colorset.Hover.Border = color.Hover.Border
return
}
func (f *Field) Event(ev events.Interface) {
f.mu.Lock()
defer f.mu.Unlock()
switch tev := ev.(type) {
case mouse.Event:
switch tev.Type {
case mouse.Enter:
f.hover = true
case mouse.Leave:
f.hover = false
case mouse.Down:
f.Pos, _ = slices.BinarySearch(f.Offsets, tev.Point.X)
f.Pos = slices.Max([]int{0, f.Pos-1})
f.updateTextImgs()
//log.Printf("f.Pos=%d", f.Pos)
case mouse.Up:
f.Pos2, _ = slices.BinarySearch(f.Offsets, tev.Point.X)
if f.Pos2 < f.Pos {
f.Pos2, f.Pos = f.Pos, f.Pos2
}
f.Pos2 = clamp(0, f.Pos2-1, len(f.Text)-1)
f.Pos2 = slices.Max([]int{0, f.Pos2-1})
//log.Printf("f.Pos2=%d", f.Pos2)
//log.Printf("selected %d/%d: %s", f.Pos, f.Pos2, f.Text[f.Pos:f.Pos2+1])
//f.updateTextImgs()
}
if f.cb != nil {
f.cb(tev, f.cbUserData)
}
case keyboard.Event:
//log.Printf("key pressed: %+v %d % x", tev, tev, tev)
switch tev.Key {
case Backspace:
if f.Pos > 0 && f.Pos <= len(f.Text) && len(f.Text) > 0 {
f.Text = f.Text[:f.Pos-1] + f.Text[f.Pos:]
}
f.Pos -= 1
case draw.KeyDelete:
if f.Pos < len(f.Text) {
f.Text = f.Text[:f.Pos] + f.Text[f.Pos+1:]
}
case draw.KeyLeft:
f.Pos -= 1
case draw.KeyRight:
f.Pos += 1
default:
f.Text = f.Text[:f.Pos]+string([]byte{byte(tev.Key)})+f.Text[f.Pos:]
f.Pos += 1
}
if f.Pos < 0 {
f.Pos = 0
}
if f.Pos > len(f.Text) {
f.Pos = len(f.Text)
}
//log.Printf("event: call updateTextImgs")
f.updateTextImgs()
}
}
func clamp(a, x, b int) int {
x = slices.Min([]int{x, b})
x = slices.Max([]int{a, x})
return x
}
func (f *Field) Render() *memdraw.Image {
f.mu.RLock()
defer f.mu.RUnlock()
if f.borderImg == nil {
//log.Printf("render: call updateTextImgs")
f.updateTextImgs()
}
if f.hover {
return f.hoverImg
} else {
return f.borderImg
}
}
func (f *Field) updateTextImgs() {
var err error
f.textImg, err = font.String(f.Text, &f.Offsets)
if err != nil {
panic(err.Error())
}
r := f.Rectangle//f.textImg.R.Intersect(f.Rectangle)
f.borderImg, err = memdraw.AllocImage(f.Rectangle.Inset(-f.x.Scale(5)).Add(f.x.Pt(5, 5)), draw.ABGR32)
if err != nil {
panic(err.Error())
}
memdraw.FillColor(f.borderImg, draw.Opaque)
f.hoverImg, err = memdraw.AllocImage(f.Rectangle.Inset(-f.x.Scale(5)).Add(f.x.Pt(5, 5)), draw.ABGR32)
if err != nil {
panic(err.Error())
}
memdraw.FillColor(f.hoverImg, draw.Opaque)
rr := r
rr.Min = r.Min.Add(f.x.Pt(3, 7))
f.borderImg.Draw(rr, f.textImg, image.ZP, color.EmptyMask, image.ZP, draw.SoverD)
geom.DrawRoundedBorder(f.borderImg, f.Rectangle, f.Colorset.Normal.Border)
f.hoverImg.Draw(rr, f.textImg, image.ZP, color.EmptyMask, image.ZP, draw.SoverD)
geom.DrawRoundedBorder(f.hoverImg, f.Rectangle, f.Colorset.Hover.Border)
pos := f.Pos
if pos+1 >= len(f.Offsets) {
pos = len(f.Offsets)-1
}
textPartR := draw.Rect(0, 0, f.Offsets[pos], f.textImg.R.Dy())
if err == nil {
geom.DrawCursor(f.hoverImg, r, textPartR, f.Colorset.Hover.Border)
} else {
log.Printf("font string sub text: %v", err)
}
}
func (f Field) Focus() {
}
func (f Field) Layout() layout.Interface {
return layout.Inline{}
}
func (f *Field) Geom() (r image.Rectangle, margin space.Sp) {
f.mu.RLock()
defer f.mu.RUnlock()
if f.borderImg == nil {
//log.Printf("geom: call updateTextImgs")
f.updateTextImgs()
}
return f.borderImg.R, f.Margin
}
func (f *Field) SetCallback(cb func(ev events.Interface, userData any), userData any) {
f.cb = cb
f.cbUserData = userData
}