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package ui
import (
"github.com/mattn/go-runewidth"
tb "github.com/nsf/termbox-go"
)
const (
TEXT_LEFT = iota
TEXT_CENTER = iota
TEXT_RIGHT = iota
)
type Text struct {
text string
strategy uint
fg tb.Attribute
bg tb.Attribute
onInvalidate func(d Drawable)
}
func NewText(text string) *Text {
return &Text{text: text}
}
func (t *Text) Text(text string) *Text {
t.text = text
t.Invalidate()
return t
}
func (t *Text) Strategy(strategy uint) *Text {
t.strategy = strategy
t.Invalidate()
return t
}
func (t *Text) Color(fg tb.Attribute, bg tb.Attribute) *Text {
t.fg = fg
t.bg = bg
t.Invalidate()
return t
}
func (t *Text) Draw(ctx *Context) {
size := runewidth.StringWidth(t.text)
cell := tb.Cell{
Ch: ' ',
Fg: t.fg,
Bg: t.bg,
}
x := 0
if t.strategy == TEXT_CENTER {
x = (ctx.Width() - size) / 2
}
if t.strategy == TEXT_RIGHT {
x = ctx.Width() - size
}
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), cell)
ctx.Printf(x, 0, cell, "%s", t.text)
}
func (t *Text) OnInvalidate(onInvalidate func(d Drawable)) {
t.onInvalidate = onInvalidate
}
func (t *Text) Invalidate() {
if t.onInvalidate != nil {
t.onInvalidate(t)
}
}
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