func (p CheckboxPainter) PaintCheckbox(canvas widget.Canvas, state checkbox.PaintState) {
	if state.Bounds.IsEmpty() {
		return
	}

	colors := state.ColorScheme
	if colors == (checkbox.CheckboxColorScheme{}) {
		colors = p.resolveColors()
	}

	boxRect := dtCheckboxBoxRect(state.Bounds)
	disabled := state.Disabled

	if state.Checked || state.Indeterminate {
		dtPaintCheckedBox(canvas, boxRect, state, disabled, colors)
	} else {
		dtPaintUncheckedBox(canvas, boxRect, state, disabled, colors)
	}

	// Label.
	if state.Label != "" {
		fg := colors.LabelColor
		if disabled {
			fg = colors.DisabledFg
		}
		labelBounds := dtCheckboxLabelBounds(state.Bounds)
		canvas.DrawText(state.Label, labelBounds, dtCBFontSize, fg, false, dtCBTextAlignLeft)
	}

	// Focus indicator.
	if state.Focused && !disabled {
		dtDrawFocusRing(canvas, boxRect, dtCBCornerRadius, colors.FocusRing)
	}
}

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