v0.1.0 initial commit

tui/pane.go

@@ -0,0 +1,69 @@
+package tui
+
+import (
+	"github.com/lixenwraith/terminal"
+)
+
+// PaneOpts configures pane rendering
+type PaneOpts struct {
+	Title    string
+	Border   LineType
+	BorderFg terminal.RGB
+	Bg       terminal.RGB
+	TitleFg  terminal.RGB
+}
+
+// Pane draws bordered pane with optional title, returns content region
+// Content region is inside border, below title row if present
+func (r Region) Pane(opts PaneOpts) Region {
+	if r.W < 3 || r.H < 3 {
+		return r.Sub(1, 1, 0, 0)
+	}
+
+	// Fill background
+	r.Fill(opts.Bg)
+
+	// Draw border
+	r.Box(opts.Border, opts.BorderFg)
+
+	// Title on top edge
+	headerH := 0
+	if opts.Title != "" {
+		headerH = 1
+		title := " " + opts.Title + " "
+		if RuneLen(title) > r.W-4 {
+			title = Truncate(title, r.W-4)
+		}
+		x := 2
+		for i, ch := range title {
+			if x+i >= r.W-1 {
+				break
+			}
+			r.Cell(x+i, 0, ch, opts.TitleFg, opts.Bg, terminal.AttrBold)
+		}
+	}
+
+	// Return content region (inside border, below title)
+	return r.Sub(1, 1+headerH, r.W-2, r.H-2-headerH)
+}
+
+// TitledPane fills region with background, draws centered title at top, returns content region
+// Content region starts at row 1 with full width
+func (r Region) TitledPane(title string, titleFg, bg terminal.RGB) Region {
+	r.Fill(bg)
+	if title != "" && r.H > 0 {
+		r.TextCenter(0, title, titleFg, bg, terminal.AttrBold)
+	}
+	if r.H <= 1 {
+		return r.Sub(0, 0, r.W, 0)
+	}
+	return r.Sub(0, 1, r.W, r.H-1)
+}
+
+// TitledPaneFocused is TitledPane with focus-dependent background
+func (r Region) TitledPaneFocused(title string, titleFg, bg, focusBg terminal.RGB, focused bool) Region {
+	if focused {
+		bg = focusBg
+	}
+	return r.TitledPane(title, titleFg, bg)
+}