v0.1.0 initial commit

tui/button.go

@@ -0,0 +1,127 @@
+package tui
+
+import "github.com/lixenwraith/terminal"
+
+// Button defines a single button in a button bar
+type Button struct {
+	Label   string
+	Key     string // Keyboard hint (e.g., "Ctrl+S")
+	Focused bool
+}
+
+// ButtonBarOpts configures button bar rendering
+type ButtonBarOpts struct {
+	Align BarAlign
+	Gap   int
+	Style ButtonStyle
+}
+
+// ButtonStyle defines button bar colors
+type ButtonStyle struct {
+	LabelFg terminal.RGB
+	LabelBg terminal.RGB
+	KeyFg   terminal.RGB
+	FocusFg terminal.RGB
+	FocusBg terminal.RGB
+	Bg      terminal.RGB
+}
+
+// DefaultButtonStyle returns default button colors with dark background
+func DefaultButtonStyle() ButtonStyle {
+	return DefaultButtonStyleFrom(terminal.RGB{R: 25, G: 25, B: 35})
+}
+
+// DefaultButtonStyleFrom returns default button colors using the given background
+func DefaultButtonStyleFrom(bg terminal.RGB) ButtonStyle {
+	return ButtonStyle{
+		LabelFg: terminal.RGB{R: 200, G: 200, B: 200},
+		LabelBg: terminal.RGB{R: 50, G: 50, B: 60},
+		KeyFg:   terminal.RGB{R: 130, G: 130, B: 150},
+		FocusFg: terminal.RGB{R: 255, G: 255, B: 255},
+		FocusBg: terminal.RGB{R: 60, G: 80, B: 120},
+		Bg:      bg,
+	}
+}
+
+// ButtonBar renders a row of buttons with labels and keyboard hints at row y
+func (r Region) ButtonBar(y int, buttons []Button, opts ButtonBarOpts) {
+	if len(buttons) == 0 || y < 0 || y >= r.H {
+		return
+	}
+
+	style := opts.Style
+	if style == (ButtonStyle{}) {
+		style = DefaultButtonStyle()
+	}
+
+	gap := opts.Gap
+	if gap < 1 {
+		gap = 2
+	}
+
+	// Calculate total width
+	totalW := 0
+	for i, btn := range buttons {
+		btnW := RuneLen(btn.Label) + 2
+		if btn.Key != "" {
+			btnW += RuneLen(btn.Key) + 1
+		}
+		totalW += btnW
+		if i < len(buttons)-1 {
+			totalW += gap
+		}
+	}
+
+	// Starting X
+	x := 0
+	switch opts.Align {
+	case BarAlignRight:
+		x = r.W - totalW
+	case BarAlignCenter:
+		x = (r.W - totalW) / 2
+	case BarAlignLeft:
+		x = 0
+	}
+	if x < 0 {
+		x = 0
+	}
+
+	// Clear row
+	for i := 0; i < r.W; i++ {
+		r.Cell(i, y, ' ', style.LabelFg, style.Bg, terminal.AttrNone)
+	}
+
+	// Render buttons
+	for i, btn := range buttons {
+		fg := style.LabelFg
+		bg := style.LabelBg
+		if btn.Focused {
+			fg = style.FocusFg
+			bg = style.FocusBg
+		}
+
+		label := " " + btn.Label + " "
+		for _, ch := range label {
+			if x >= r.W {
+				break
+			}
+			r.Cell(x, y, ch, fg, bg, terminal.AttrNone)
+			x++
+		}
+
+		if btn.Key != "" {
+			keyStr := " " + btn.Key
+			for _, ch := range keyStr {
+				if x >= r.W {
+					break
+				}
+				r.Cell(x, y, ch, style.KeyFg, style.Bg, terminal.AttrNone)
+				x++
+			}
+		}
+
+		if i < len(buttons)-1 {
+			x += gap
+		}
+	}
+}