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-rw-r--r--lib/ui/borders.go73
1 files changed, 73 insertions, 0 deletions
diff --git a/lib/ui/borders.go b/lib/ui/borders.go
new file mode 100644
index 00000000..08071ad0
--- /dev/null
+++ b/lib/ui/borders.go
@@ -0,0 +1,73 @@
+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)
+}