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-rw-r--r--ui/text.go71
1 files changed, 71 insertions, 0 deletions
diff --git a/ui/text.go b/ui/text.go
new file mode 100644
index 0000000..6164837
--- /dev/null
+++ b/ui/text.go
@@ -0,0 +1,71 @@
+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)
+ }
+}