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package ui
import (
tb "github.com/nsf/termbox-go"
)
const (
BORDER_LEFT = 1 << iota
BORDER_TOP = 1 << iota
BORDER_RIGHT = 1 << iota
BORDER_BOTTOM = 1 << iota
)
type Bordered struct {
borders uint
content Drawable
onInvalidate func(d Drawable)
}
func NewBordered(content Drawable, borders uint) *Bordered {
b := &Bordered{
borders: borders,
content: content,
}
content.OnInvalidate(b.contentInvalidated)
return b
}
func (bordered *Bordered) contentInvalidated(d Drawable) {
bordered.Invalidate()
}
func (bordered *Bordered) Invalidate() {
if bordered.onInvalidate != nil {
bordered.onInvalidate(bordered)
}
}
func (bordered *Bordered) OnInvalidate(onInvalidate func(d Drawable)) {
bordered.onInvalidate = onInvalidate
}
func (bordered *Bordered) Draw(ctx *Context) {
x := 0
y := 0
width := ctx.Width()
height := ctx.Height()
cell := tb.Cell{
Ch: ' ',
Fg: tb.ColorBlack,
Bg: tb.ColorWhite,
}
if bordered.borders&BORDER_LEFT != 0 {
ctx.Fill(0, 0, 1, ctx.Height(), cell)
x += 1
width -= 1
}
if bordered.borders&BORDER_TOP != 0 {
ctx.Fill(0, 0, ctx.Width(), 1, cell)
y += 1
height -= 1
}
if bordered.borders&BORDER_RIGHT != 0 {
ctx.Fill(ctx.Width()-1, 0, 1, ctx.Height(), cell)
width -= 1
}
if bordered.borders&BORDER_BOTTOM != 0 {
ctx.Fill(0, ctx.Height()-1, ctx.Width(), 1, cell)
height -= 1
}
subctx := ctx.Subcontext(x, y, width, height)
bordered.content.Draw(subctx)
}
|