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