Method layoutLine

texteditor/layout.go:221–254

layoutLine generates render of given line (including highlighting). If the line with exceeds the current maximum, or the number of effective lines (e.g., from word-wrap) is different, then NeedsLayout is called and it returns true.

(ln int)

// lines (e.g., from word-wrap) is different, then NeedsLayout is called
// and it returns true.
func (ed *Editor) layoutLine(ln int) bool {
	if ed.Buffer == nil || ed.Buffer.NumLines() == 0 || ln >= len(ed.renders) {
		return false
	}
	sty := &ed.Styles
	fst := sty.FontRender()
	fst.Background = nil
	mxwd := float32(ed.linesSize.X)
	needLay := false

	rn := &ed.renders[ln]
	curspans := len(rn.Spans)
	ed.Buffer.Lock()
	rn.SetHTMLPre(ed.Buffer.Markup[ln], fst, &sty.Text, &sty.UnitContext, ed.textStyleProperties())
	ed.Buffer.Unlock()
	rn.Layout(&sty.Text, sty.FontRender(), &sty.UnitContext, ed.lineLayoutSize)
	if !ed.hasLinks && len(rn.Links) > 0 {
		ed.hasLinks = true
	}
	nwspans := len(rn.Spans)
	if nwspans != curspans && (nwspans > 1 || curspans > 1) {
		needLay = true
	}
	if rn.BBox.Size().X > mxwd {
		needLay = true
	}

	if needLay {
		ed.NeedsLayout()
	} else {
		ed.NeedsRender()
	}
	return needLay
}