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