ui: box and frame an interactive widget

Draw a framed box with a title containing an interactive-drawable
widget.

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/lib/ui/box.go b/lib/ui/box.go
new file mode 100644
index 00000000..96b95d59
--- /dev/null
+++ b/lib/ui/box.go
@@ -0,0 +1,74 @@
+package ui
+
+import (
+	"strings"
+
+	"git.sr.ht/~rjarry/aerc/config"
+	"github.com/gdamore/tcell/v2"
+	"github.com/mattn/go-runewidth"
+)
+
+type Box struct {
+	content  Drawable
+	title    string
+	borders  string
+	uiConfig *config.UIConfig
+}
+
+func NewBox(
+	content Drawable, title, borders string, uiConfig *config.UIConfig,
+) *Box {
+	if borders == "" || len(borders) < 8 {
+		borders = "││┌─┐└─┘"
+	}
+
+	b := &Box{
+		content:  content,
+		title:    title,
+		borders:  borders,
+		uiConfig: uiConfig,
+	}
+	return b
+}
+
+func (b *Box) Draw(ctx *Context) {
+	w := ctx.Width()
+	h := ctx.Height()
+
+	style := b.uiConfig.GetStyle(config.STYLE_BORDER)
+
+	box := []rune(b.borders)
+	ctx.Fill(0, 0, 1, h, box[0], style)
+	ctx.Fill(w-1, 0, 1, h, box[1], style)
+
+	ctx.Printf(0, 0, style, "%c%s%c", box[2], strings.Repeat(string(box[3]), w-2), box[4])
+	ctx.Printf(0, h-1, style, "%c%s%c", box[5], strings.Repeat(string(box[6]), w-2), box[7])
+
+	if b.title != "" && w > 4 {
+		title := runewidth.Truncate(b.title, w-4, "…")
+		ctx.Printf(2, 0, style, "%s", title)
+	}
+
+	subctx := ctx.Subcontext(1, 1, w-2, h-2)
+	b.content.Draw(subctx)
+}
+
+func (b *Box) Invalidate() {
+	b.content.Invalidate()
+}
+
+func (b *Box) MouseEvent(localX int, localY int, event tcell.Event) {
+	if content, ok := b.content.(Mouseable); ok {
+		content.MouseEvent(localX, localY, event)
+	}
+}
+
+func (b *Box) Event(e tcell.Event) bool {
+	if content, ok := b.content.(Interactive); ok {
+		return content.Event(e)
+	}
+	return false
+}
+
+func (b *Box) Focus(_ bool) {
+}