Method drawText

widgets/button/button.go:221–267

drawText draws the text inside the button.

(cvs *canvas.Canvas, meta *widgetapi.Meta, buttonAr image.Rectangle)

// drawText draws the text inside the button.
func (b *Button) drawText(cvs *canvas.Canvas, meta *widgetapi.Meta, buttonAr image.Rectangle) error {
	pad := b.opts.textHorizontalPadding
	textAr := image.Rect(buttonAr.Min.X+pad, buttonAr.Min.Y, buttonAr.Dx()-pad, buttonAr.Max.Y)
	start, err := alignfor.Text(textAr, b.text.String(), align.HorizontalCenter, align.VerticalMiddle)
	if err != nil {
		return err
	}

	maxCells := buttonAr.Max.X - start.X
	trimmed, err := draw.TrimText(b.text.String(), maxCells, draw.OverrunModeThreeDot)
	if err != nil {
		return err
	}

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

	cur := start
	for i, r := range trimmed {
		if i >= optRange.High { // Get the next write options.
			or, err := b.tOptsTracker.ForPosition(i)
			if err != nil {
				return err
			}
			optRange = or
		}

		tOpts := b.givenTOpts[optRange.AttrIdx]
		var cellOpts []cell.Option
		switch {
		case b.state == button.Down && len(tOpts.pressedCellOpts) > 0:
			cellOpts = tOpts.pressedCellOpts
		case meta.Focused && len(tOpts.focusedCellOpts) > 0:
			cellOpts = tOpts.focusedCellOpts
		default:
			cellOpts = tOpts.cellOpts
		}
		cells, err := cvs.SetCell(cur, r, cellOpts...)
		if err != nil {
			return err
		}
		cur = image.Point{cur.X + cells, cur.Y}
	}
	return nil
}

// activated asserts whether the keyboard event activated the button.
func (b *Button) keyActivated(k *terminalapi.Keyboard, meta *widgetapi.EventMeta) bool {