Method IsValid

paint/span.go:72–80

IsValid ensures that at least some text is represented and the sizes of Text and Render slices are the same, and that the first render info is non-nil

()

// IsValid ensures that at least some text is represented and the sizes of
// Text and Render slices are the same, and that the first render info is non-nil
func (sr *Span) IsValid() error {
	if len(sr.Text) == 0 {
		return errors.New("core.Text: Text is empty")
	}
	if len(sr.Text) != len(sr.Render) {
		return fmt.Errorf("core.Text: Render length %v != Text length %v for text: %v", len(sr.Render), len(sr.Text), string(sr.Text))
	}
	return sr.Render[0].HasNil()
}

// SizeHV computes the size of the text span from the first char to the last
// position, which is valid for purely horizontal or vertical text lines --