func (p StripePainter) PaintBackground(canvas widget.Canvas, bounds geometry.Rect) {
	if bounds.IsEmpty() {
		return
	}
	colors := p.resolveColors()
	canvas.DrawRect(bounds, colors.Background)

	// 1px right border for left stripe, left border for right stripe.
	borderRect := geometry.NewRect(
		bounds.Max.X-dtStripeBorderWidth,
		bounds.Min.Y,
		dtStripeBorderWidth,
		bounds.Height(),
	)
	canvas.DrawRect(borderRect, colors.Border)
}

func (p StripePainter) PaintButton(canvas widget.Canvas, state stripe.ButtonPaintState) {
	if state.Bounds.IsEmpty() {
		return
	}
	colors := p.resolveColors()

	// Background on hover/press/active.
	bg := widget.ColorTransparent
	switch {
	case state.Pressed:
		bg = colors.PressedBg
	case state.Hovered:
		bg = colors.HoverBg
	case state.Active:
		bg = colors.ActiveBg
	}
	if !bg.IsTransparent() {
		canvas.DrawRoundRect(state.Bounds, bg, dtStripeButtonRadius)
	}

	// Icon color.
	fg := colors.Foreground
	if state.Active {
		fg = colors.ActiveFg
	}

	// Draw icon centered horizontally.
	iconBounds := dtStripeIconBounds(state.Bounds, state.ShowLabel)
	icon.Draw(canvas, state.Icon, iconBounds, fg)

	// Draw label below icon if enabled.
	if state.ShowLabel && state.Label != "" {
		textBounds := dtStripeTextBounds(state.Bounds, iconBounds)
		canvas.DrawText(state.Label, textBounds, dtStripeLabelFontSize, fg, false, widget.TextAlignCenter)
	}
}

type StripePainter struct {
	Theme *Theme	// nil uses default DevTools dark fallback
}