Method layoutText

widget/text.go:486–524

(lt *text.Shaper)

}

func (e *textView) layoutText(lt *text.Shaper) {
	e.Seek(0, io.SeekStart)
	var r io.Reader = e
	if e.Mask != 0 {
		e.maskReader.Reset(e, e.Mask)
		r = &e.maskReader
	}
	e.index.reset()
	it := textIterator{viewport: image.Rectangle{Max: image.Point{X: math.MaxInt, Y: math.MaxInt}}}
	if lt != nil {
		lt.Layout(e.params, r)
		for {
			g, ok := lt.NextGlyph()
			if !it.processGlyph(g, ok) {
				break
			}
			e.index.Glyph(g)
		}
	} else {
		// Make a fake glyph for every rune in the reader.
		b := bufio.NewReader(r)
		for _, _, err := b.ReadRune(); err != io.EOF; _, _, err = b.ReadRune() {
			g := text.Glyph{Runes: 1, Flags: text.FlagClusterBreak}
			_ = it.processGlyph(g, true)
			e.index.Glyph(g)
		}
	}
	e.paragraphReader.SetSource(e.rr)
	e.graphemes = e.graphemes[:0]
	for g := e.paragraphReader.Graphemes(); len(g) > 0; g = e.paragraphReader.Graphemes() {
		if len(e.graphemes) > 0 && g[0] == e.graphemes[len(e.graphemes)-1] {
			g = g[1:]
		}
		e.graphemes = append(e.graphemes, g...)
	}
	dims := layout.Dimensions{Size: it.bounds.Size()}
	dims.Baseline = dims.Size.Y - it.baseline
	e.dims = dims
}

// CaretPos returns the line & column numbers of the caret.
func (e *textView) CaretPos() (line, col int) {