Method Draw

widgets/segmentdisplay/segmentdisplay.go:207–269

Draw draws the SegmentDisplay widget onto the canvas. Implements widgetapi.Widget.Draw.

(cvs *canvas.Canvas, meta *widgetapi.Meta)

// Draw draws the SegmentDisplay widget onto the canvas.
// Implements widgetapi.Widget.Draw.
func (sd *SegmentDisplay) Draw(cvs *canvas.Canvas, meta *widgetapi.Meta) error {
	sd.mu.Lock()
	defer sd.mu.Unlock()

	segAr, err := sd.preprocess(cvs.Area())
	if err != nil {
		return err
	}

	sd.lastCanFit = segAr.canFit
	if sd.buff.Len() == 0 {
		return nil
	}

	text := sd.buff.String()
	aligned, err := alignfor.Rectangle(cvs.Area(), segAr.needArea(), sd.opts.hAlign, sd.opts.vAlign)
	if err != nil {
		return fmt.Errorf("alignfor.Rectangle => %v", err)
	}

	optRange, err := sd.wOptsTracker.ForPosition(0) // Text options for the current byte.
	if err != nil {
		return err
	}

	gaps := segAr.gaps
	startX := aligned.Min.X
	for i, c := range text {
		if i >= segAr.canFit {
			break
		}

		endX := startX + segAr.segment.Dx()
		ar := image.Rect(startX, aligned.Min.Y, endX, aligned.Max.Y)
		startX = endX
		if gaps > 0 {
			startX += segAr.gapPixels
			gaps--
		}

		dCvs, err := canvas.New(ar)
		if err != nil {
			return fmt.Errorf("canvas.New => %v", err)
		}

		if i >= optRange.High { // Get the next write options.
			or, err := sd.wOptsTracker.ForPosition(i)
			if err != nil {
				return err
			}
			optRange = or
		}
		wOpts := sd.givenWOpts[optRange.AttrIdx]
		if err := sd.drawChar(dCvs, c, wOpts); err != nil {
			return err
		}

		if err := dCvs.CopyTo(cvs); err != nil {